Total heat exchanger

Abstract

This application discloses a total heat exchanger, belonging to the field of air treatment technology. The total heat exchanger includes a housing, a heat exchange core, a core's windward-facing air duct component, pressure plates, and a core's windward-facing partition. The pressure plates are a first pressure plate and a second pressure plate. The first pressure plate clamps the first air duct sidewall of the core's windward-facing air duct component to the first sidewall of the housing, and the second pressure plate clamps the second air duct sidewall of the core's windward-facing air duct component to the second sidewall of the housing. The pressure plates are provided with a first clamping portion, which abuts against the limiting wall of the core's windward-facing air duct component. The core's windward-facing partition abuts against the side of the limiting wall away from the first clamping portion and is connected to the first clamping portion. This total heat exchanger allows for the installation of air duct components made of foamed material.

Description

Technical Field

[0001] This application relates to the field of air treatment technology, and more particularly to a total heat exchanger. Background Technology

[0002] A total heat exchanger is a device with a heat exchange core, which includes a fresh air duct for circulating fresh outdoor air and an exhaust duct for discharging indoor stale air to the outside. The fresh outdoor air and the stale indoor air exchange heat at the heat exchange core to preheat or precool the introduced fresh air by recovering the waste heat in the exhaust.

[0003] The air duct in front of the heat exchange core is usually made of sheet metal partitions, with insulation cotton attached to the surface of the sheet metal partitions. In practical applications, gaps exist at the joints between sheet metal parts, which can easily lead to air leakage, reduced heat insulation performance, and even the risk of condensation. If the air duct is designed as a one-piece molded foam part, the problems of sheet metal partitions can be improved.

[0004] However, the inconvenience of designing connection structures on foam parts makes them difficult to install. Summary of the Invention

[0005] This application provides a total heat exchanger that can solve the installation problem of foamed components.

[0006] A total heat exchanger includes: a housing having two limiting sidewalls disposed opposite each other along a first direction, the two limiting sidewalls being a first sidewall and a second sidewall, the first direction being perpendicular to the height direction; a heat exchange core disposed within the housing, the length direction of the heat exchange core extending along the first direction, the two sides of the heat exchange core in a second direction being the air-facing side and the air-discharge side of the heat exchange core, the second direction being perpendicular to both the first direction and the height direction; an air duct component on the air-facing side of the core, disposed on the air-facing side of the heat exchange core, the air duct component having a fresh air inlet chamber and an exhaust air inlet chamber formed thereon; and an air-discharge side partition on the air-discharge side of the core, the air-discharge side partition separating the fresh air outlet chamber and the exhaust air outlet chamber.

[0007] The core's windward side air duct component is an integrally molded foam component, which includes: a first air duct sidewall and a second air duct sidewall, which are arranged opposite to each other along a first direction; a first partition wall, which connects the first air duct sidewall and the second air duct sidewall, and is used to separate the fresh air inlet chamber and the exhaust air inlet chamber in the height direction; and a limiting wall, which is located at the end of the first partition wall near the heat exchange core.

[0008] The total heat exchanger also includes: two pressure plates, namely a first pressure plate and a second pressure plate, the first pressure plate clamping the first air duct sidewall with the first sidewall, the second pressure plate clamping the second air duct sidewall with the second sidewall, the pressure plates being provided with a first clamping part, the first clamping part abutting against the limiting wall; and a core air-facing side partition abutting against the side of the limiting wall away from the first clamping part and connected to the first clamping part.

[0009] In this technical solution, the side wall of the core's windward side air duct component is clamped by the cooperation of the pressure plate and the side wall of the casing, thus fixing the foaming component inside the casing. The abutting connection between the core's windward side partition and the limiting wall can prevent the limiting wall from deforming due to its length, ensuring the isolation and sealing effect of the fresh air inlet cavity and the exhaust air inlet cavity, and avoiding air leakage and condensation problems caused by deformation at the limiting wall.

[0010] In some embodiments, the first clamping part abuts against the side of the limiting wall facing the fresh air inlet cavity, and the windward side partition of the core abuts against the side of the limiting wall facing the exhaust air inlet cavity.

[0011] In this technical solution, the first clamping part is located on the fresh air side of the limiting wall, so that part of the pressure plate body is located on the fresh air side of the limiting wall. In this way, a structure for installing a filter can be set on the pressure plate body.

[0012] In some embodiments, the windward side partition of the core includes: a partition body portion; and a second clamping portion connected to the end of the partition body portion away from the heat exchange core, wherein the second clamping portion is used to cooperate with the first clamping portion to clamp the limiting wall.

[0013] A portion of the first clamping part abuts against the limiting wall, and another portion of the first clamping part is connected to the partition body part by fasteners.

[0014] In this technical solution, by providing a partition body extending from the first clamping part, the first clamping part can be connected to the first clamping part, thereby achieving the connection between the first clamping part and the windward side partition of the core.

[0015] In some embodiments, the core windward side partition further includes a support portion connected to one end of the partition body portion away from the second clamping portion, the support portion having a slot, and one corner of the heat exchange core located in the slot.

[0016] In this technical solution, since the support part on the windward side partition of the core is connected to the heat exchange core, the problem of easy deformation and breakage of the limiting wall of the foam material when connected to the heat exchange core by the limiting wall can be avoided.

[0017] In some embodiments, the pressure plate is provided with a slot; the total heat exchanger also includes a filter for filtering air, the filter being inserted into the slot.

[0018] In this technical solution, the limiting wall is fixed and the filter is installed by using a pressure plate, which simplifies the product connection structure and reduces costs.

[0019] In some embodiments, the filter is attached to the partition body portion at one end in the height direction;

[0020] The windward side baffle of the core also includes a limiting part, which is connected between the baffle body and the support part. The limiting part and the baffle body are connected at an angle to limit the filter from moving towards the heat exchange core.

[0021] In this technical solution, the filter end is limited by setting a limiting part on the windward side partition of the core.

[0022] In some embodiments, a stepped portion is formed at the connection between the limiting wall and the first partition wall to restrict the filter from moving away from the heat exchange core.

[0023] In this technical solution, the filter end is limited by setting a stepped section.

[0024] In some embodiments, thermal insulation cotton is attached to the surface of the partition body facing the fresh air inlet cavity.

[0025] In this technical solution, by setting insulation cotton on the partition body, the insulation effect of the insulation surface is utilized to avoid condensation on the windward side partition of the core due to the temperature difference between the fresh air side and the exhaust air side.

[0026] In some embodiments, the end of the pressure plate on the windward side of the second direction away from the core is connected to the limiting sidewall by fasteners.

[0027] In some embodiments, the limiting sidewall has a flange at its end in the height direction, and the flange abuts against the windward side air duct of the core.

[0028] In this technical solution, the vertical movement of the windward side air duct component of the core is limited by the flanging. Attached Figure Description

[0029] Figure 1 and Figure 2 A perspective view of a total heat exchanger according to some embodiments is shown;

[0030] Figure 3 A perspective view of a total heat exchanger according to some embodiments, omitting the base plate, is shown;

[0031] Figure 4 A cross-sectional view of a total heat exchanger according to some embodiments is shown;

[0032] Figure 5A three-dimensional view of the windward side air duct of the core in a total heat exchanger according to some embodiments is shown. Figure 1 ;

[0033] Figure 6 A cross-sectional view of the windward side air duct of the core in a total heat exchanger according to some embodiments is shown;

[0034] Figure 7 A bottom view of the windward side air duct of the core in a total heat exchanger according to some embodiments is shown;

[0035] Figure 8 A three-dimensional view of the windward side air duct of the core in a total heat exchanger according to some embodiments is shown. Figure 2 ;

[0036] Figure 9 A diagram showing the connection structure of the windward side air duct component of the core in a total heat exchanger according to some embodiments is provided;

[0037] Figure 10 An exploded view of the core windward side air duct, core windward side baffle, and pressure plate in a total heat exchanger according to some embodiments is shown;

[0038] Figure 11 A perspective view of the core outlet side baffle in a total heat exchanger according to some embodiments is shown;

[0039] Figure 12 A top view of the core outlet side baffle and fan in a total heat exchanger according to some embodiments is shown;

[0040] Figure 13 A side view of the core outlet side baffle and fan in a total heat exchanger according to some embodiments is shown;

[0041] Figure 14 A left view of the heat exchange core and the outlet side baffle of the core in a total heat exchanger according to some embodiments is shown;

[0042] Figure 15 A three-dimensional view of a fan in a total heat exchanger according to some embodiments is shown. Figure 1 ;

[0043] Figure 16 A three-dimensional view of a fan in a total heat exchanger according to some embodiments is shown. Figure 2 ;

[0044] Figure 17 A rear view of a fan in a total heat exchanger according to some embodiments is shown;

[0045] Figure 18 A top view of an impeller in a total heat exchanger according to some embodiments is shown;

[0046] Figure 19 A perspective view of a fan and a limiting member in a total heat exchanger according to some embodiments is shown;

[0047] Figure 20 An exploded view of a fan and a limiting element in a total heat exchanger according to some embodiments is shown;

[0048] Figure 21 A bottom view of a total heat exchanger according to some embodiments, omitting the maintenance cover, is shown. Detailed Implementation

[0049] To make the objectives and implementation methods of this application clearer, the exemplary implementation methods of this application will be clearly and completely described below with reference to the accompanying drawings of the exemplary embodiments of this application. Obviously, the exemplary embodiments described are only some embodiments of this application, and not all embodiments.

[0050] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0051] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0052] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0053] Hereinafter, embodiments of this application will be described in detail with reference to the accompanying drawings.

[0054] Reference Figures 1 to 4The total heat exchanger 100 according to an embodiment of this application includes a housing 101 forming the exterior. For example, the housing 101 may have a hexahedral shape. Since the total heat exchanger 100 is mostly used by being suspended in the ceiling, the dimension of the total heat exchanger 100 in the height direction Z is smaller than its dimensions in the other two directions (the first direction X and the second direction Y) to reduce the height space it occupies.

[0055] In some embodiments, housing 101 may include a first sidewall 107a, a third sidewall 107c, a second sidewall 107b, and a fourth sidewall 107d connected end to end. Housing 101 may include a top wall forming a top structure and a bottom wall forming a bottom structure.

[0056] The housing 101 includes: a fresh air inlet 101a for connecting to the outdoor space and drawing outdoor air OA into the interior of the housing 101; and a fresh air outlet 101b for connecting to the indoor space and expelling the outdoor air OA drawn into the housing 101 into the indoor space.

[0057] The housing 101 includes: an exhaust air inlet 101c, which is used to connect to an indoor space and draw indoor air RA into the housing 101; and an exhaust air outlet 101d, which is used to connect to an outdoor space and exhaust the indoor air RA drawn into the housing 101 to the outdoor space.

[0058] The housing 101 contains a fresh air inlet chamber 103, a fresh air outlet chamber 104, an exhaust air inlet chamber 105, and an exhaust air outlet chamber 106. The fresh air inlet chamber 103 and the fresh air outlet chamber 104 are connected between the fresh air inlet 101a and the fresh air outlet 101b to form a fresh air duct, which draws outdoor air OA into the room and guides it into the indoor space. The exhaust air inlet chamber 105 and the exhaust air outlet chamber 106 are connected between the exhaust air inlet 101c and the exhaust air outlet 101d to form an exhaust air duct, which guides indoor air RA to the outdoor space.

[0059] The total heat exchanger 100 may include two fans: a fresh air fan 120a, located inside the fresh air outlet chamber 104 and connected to the fresh air outlet 101b; and an exhaust fan 120b, located inside the exhaust outlet chamber 106 and connected to the exhaust outlet 101d. The fresh air fan 120a generates the airflow required to exhaust air to the fresh air outlet 101b. The exhaust fan 120b generates the airflow required to exhaust air to the exhaust outlet 101d.

[0060] The total heat exchanger 100 may include a heat exchange core 130 for exchanging heat between outdoor air OA and indoor air RA. When operating in heat exchange mode, the air in the fresh air duct and the air in the exhaust air duct can exchange heat with each other in the heat exchange core 130.

[0061] In some embodiments, the heat exchange core 130 extends along a first direction X in its longitudinal direction, and is disposed at the middle of the housing 101 in a second direction Y. The two sides of the heat exchange core 130 in the second direction Y are the windward side and the air outlet side of the heat exchange core 130, respectively. The fresh air inlet cavity 103 and the exhaust air inlet cavity 105 are disposed on the windward side of the heat exchange core 130, and the fresh air outlet cavity 104 and the exhaust air outlet cavity 106 are disposed on the air outlet side of the heat exchange core 130.

[0062] The heat exchange core 130 connects the fresh air inlet chamber 103 and the fresh air outlet chamber 104. The heat exchange core 130 also connects the exhaust air inlet chamber 105 and the exhaust air outlet chamber 106. When the total heat exchanger 100 is in heat exchange mode, outdoor air OA flowing through the fresh air duct and indoor air RA flowing through the exhaust air duct exchange heat in the heat exchange core 130 without contact.

[0063] In some embodiments, see specific references Figure 4 , Figure 4 The middle arrow indicates the airflow direction. The heat exchange core 130 is generally hexahedral in shape. The heat exchange core 130 includes a fresh air inflow surface 130a, an exhaust air inflow surface 130b, a fresh air outflow surface 130c, and an exhaust air outflow surface 130d.

[0064] The air in the fresh air inlet cavity 103 flows to the fresh air inlet surface 130a, passes through the heat exchange core 130, and then flows from the fresh air outlet surface 130c to the fresh air outlet cavity 104. The air in the exhaust air inlet cavity 105 flows to the exhaust air inlet surface 130b, passes through the heat exchange core 130, and then flows from the exhaust air outlet surface 130d to the exhaust air outlet cavity 106.

[0065] The fresh air inflow surface 130a and the exhaust air inflow surface 130b are set along the height direction, and the corner where the two intersect is the first corner 131a, which is located in the middle of the height direction Z.

[0066] The angle where the exhaust air inflow surface 130b intersects with the fresh air outflow surface 130c is the second angle 131b. The fresh air outflow surface 130c and the exhaust air outflow surface 130d are arranged along the height direction Z, and the angle where they intersect is the third angle 131c, which is located at the middle of the height direction Z. The angle where the exhaust air outflow surface 130d intersects with the fresh air inflow surface 130a is the fourth angle 131d. One of the second angle 131b and the fourth angle 131d is connected to the top wall of the housing 101, and the other is connected to the bottom wall of the housing 101.

[0067] For example, the fresh air inflow surface 130a is located below the exhaust air inflow surface 130b, and the fresh air outflow surface 130c is located above the exhaust air outflow surface 130d. The second corner 131b is connected to the top wall of the housing 101, and the fourth corner 131d is connected to the bottom wall of the housing 101.

[0068] In some embodiments, refer to Figure 3 and Figure 4 The total heat exchanger 100 includes a core air duct 140 on the windward side. The core air duct 140 is disposed inside the housing 101 and located on the windward side of the heat exchange core 130. A fresh air inlet chamber 103 and an exhaust air inlet chamber 105 are formed on the core air duct 140.

[0069] In some embodiments, the total heat exchanger 100 includes a core outlet side baffle 150. The core outlet side baffle 140 is disposed within the housing 101 and located on the outlet side of the heat exchange core 130. The core outlet side baffle 150 serves to separate the fresh air outlet chamber 104 and the exhaust air outlet chamber 106.

[0070] In some embodiments, the total heat exchanger 100 may include a filter 160 for filtering out foreign matter contained in the air.

[0071] Filter 160 may include at least one of a high-efficiency filter (HEPA) filter and a pre-filter. The pre-filter uses non-woven fabric filter material and can filter large particles of dust and insects from the air. The HEPA filter uses glass fiber filter material and melt-blown non-woven filter material and can intercept particulate matter, bacteria, and viruses.

[0072] The filter 160 is installed in the fresh air duct and is specifically used to capture foreign objects contained in the outdoor air OA. The filter in the fresh air duct can be installed between the fresh air inlet 101a and the heat exchange core 130.

[0073] In some embodiments, a filter is disposed within the exhaust duct, specifically for capturing foreign matter contained in the indoor air RA, thereby achieving filtration of the indoor air RA. The filter within the exhaust duct may be disposed between the exhaust inlet 101c and the heat exchange core 130.

[0074] In some embodiments, the filter 160 is disposed parallel to the side of the heat exchange core 130. The filter 160 may face the side of the heat exchange core 130 close to it.

[0075] If the filter 160 and the heat exchange core 130 have a large gap, the air will experience flow separation when it flows out of the filter 160 into the gap, and vortices may even be generated in the gap, resulting in poor airflow and high flow resistance. Therefore, in this application, the filter 160 and the heat exchange core 130 are placed close to each other, which can make the airflow smoother, reduce flow separation and vortex generation, and reduce air flow resistance.

[0076] When the fresh air fan 120a is running, outdoor air OA flows into the fresh air inlet chamber 103 through the fresh air inlet 101a and then flows into the fresh air outlet chamber 104 through the filter 160 and the heat exchange core 130 in sequence. Finally, it is discharged into the indoor space through the fresh air fan 120a and the fresh air outlet 101b.

[0077] When the exhaust fan 120b is running, indoor air RA flows into the exhaust inlet chamber 105 through the exhaust inlet 101c, flows into the exhaust outlet chamber 106 through the heat exchange core 130, and is discharged to the outdoor space through the exhaust fan 120b and the exhaust outlet 101d.

[0078] The following reference Figures 5 to 10 A detailed introduction is given regarding the windward side air duct component 140 of the core:

[0079] The airflow layout and form of the windward side air duct 140 of the core will affect the surface velocity distribution of the airflow to the heat exchange core 130, thereby affecting the enthalpy efficiency of the core and the internal resistance of the whole machine.

[0080] However, in related technologies, the windward side air duct component 140 of the core is mostly formed by sheet metal bending. Due to the influence of the processing technology, the flow field uniformity on the surface of the core is not good and there are local eddies. The wind speed in some areas is high and some areas are blind spots for air supply, resulting in low core utilization and enthalpy efficiency, and increasing the internal resistance of the whole machine.

[0081] In some embodiments, to improve the flow field uniformity on the core surface, the windward side air duct component 140 of the core is made of a one-piece molded foam. The material of the foam can be high-foaming polypropylene (EPP) or expanded polystyrene (EPS).

[0082] Since the windward side air duct component 140 of the core is a foamed component, a smooth flow guiding structure such as streamlined or irregular shape can be set on it to guide the flow of air. The air duct has a good flow guiding effect, thereby improving the uniformity of airflow velocity on the surface of the heat exchange core 130, thereby improving the enthalpy efficiency of the core and reducing wind resistance.

[0083] The lightweight nature of foamed components reduces the overall weight of the machine, enabling a lightweight design. The thermal insulation properties of the foamed components eliminate the need for insulation cotton on the air duct walls, improving manufacturing efficiency and reducing production costs.

[0084] Since the core windward side air duct component 140 is a one-piece molded part, there is no gap between the fresh air inlet cavity 103 and the exhaust air inlet cavity 105, which can ensure the isolation and sealing of the two cavities and improve the net fresh air rate and net fresh air volume. Therefore, the one-piece molded core windward side air duct component 140 of this application avoids the air leakage or even condensation caused by the connection gap between sheet metal partitions in related technologies.

[0085] In some embodiments, refer to Figure 5 The core windward side air duct component 140 includes a first air duct sidewall 141. The first air duct sidewall 141 abuts against the inner surface of the first sidewall 107a. The first sidewall 107a is provided with a fresh air inlet 101a, and the first air duct sidewall 141 is provided with a fresh air inlet 141a. The fresh air inlet 101a and the fresh air inlet 141a are connected to each other.

[0086] The core's windward-facing air duct component 140 includes a second air duct sidewall 142. The second air duct sidewall 142 abuts against the inner surface of the second sidewall 107b. The second sidewall 107b is provided with an exhaust air inlet 101c, and the second air duct sidewall 142 is provided with an exhaust air inlet 142a. The exhaust air inlet 101c and the exhaust air inlet 142a communicate with each other.

[0087] The core windward side air duct component 140 includes a first partition wall 143. The first partition wall 143 extends generally laterally and connects between the first air duct sidewall 141 and the second air duct sidewall 142, for separating at least a portion of the fresh air inlet cavity 103 and the exhaust air inlet cavity 105 in the height direction Z. For example, the fresh air inlet cavity 103 is located below the first partition wall 143, and at least a portion of the exhaust air inlet cavity 105 is located above the first partition wall 143.

[0088] In some embodiments, refer to Figure 6 The first partition wall 143 is located within the rectangular dashed frame. The first partition wall 143 is spaced from the center plane P1 of the windward side air duct component 140 of the core, which is perpendicular to the height direction Z. In the two spaces separated by the first partition wall 143, the side with a larger space height is the fresh air inlet cavity 103, and the side with a smaller space height is the exhaust air inlet cavity 105.

[0089] Typically, fresh air ducts have more structural components than exhaust ducts. For example, fresh air ducts typically have more high-efficiency filters (HEPA filters) than exhaust ducts, and are 350m... 3At an airflow rate of / h, the resistance at the HEPA filter is 50Pa. Therefore, the air resistance in the fresh air duct is greater. Under the same airflow and fan conditions, the speed of the fresh air fan 120a is much higher than that of the exhaust fan 120b. The high speed will lead to high noise. Therefore, setting the fresh air inlet cavity 103 to be slightly larger than the exhaust air inlet cavity 105 can balance the resistance of the fresh air duct and the exhaust air duct, reduce the speed of the fresh air fan 120a, and thus reduce the overall noise of the machine.

[0090] Therefore, by setting the first partition wall 143 to be offset from the center plane P1 in the height direction Z, the volume of the fresh air inlet cavity 103 can be made larger than that of the exhaust air inlet cavity 105, thereby balancing the resistance of the fresh air duct and the exhaust air duct and reducing noise.

[0091] Reference Figure 5 The core's windward side air duct component 140 includes a second partition wall 144. The second partition wall 144 is connected to the side of the first partition wall 143 away from the heat exchange core 130. The second partition wall 144 is connected to the first air duct sidewall 141 and the second air duct sidewall 142 at its two ends in the first direction X, respectively.

[0092] In some embodiments, the side of the second partition wall 144 facing the fresh air inlet cavity 103 is the fresh air cavity side, and at least a portion of the fresh air cavity side is the fresh air guide surface 1441. The fresh air guide surface 1441 gradually approaches the heat exchange core 130 from its end near the fresh air inlet 141a to its end away from the fresh air inlet 141a.

[0093] In some embodiments, the side of the fresh air cavity can be divided into a fresh air path forming surface 1440 and a fresh air guiding surface 1441 that are connected to each other in a direction away from the fresh air inlet 141a.

[0094] For ease of description, the first direction X is defined as the left-right direction, and the second direction Y is the front-back direction. The air-facing side of the heat exchange core 130 is at the rear, and the air-discharging side of the heat exchange core 130 is at the front. The first air duct sidewall 141 is on the right side, and the second air duct sidewall 142 is on the left side. The fresh air guide surface 1441 gradually approaches the heat exchange core 130 from right to left.

[0095] Reference Figure 7 The arrows in the diagram indicate the airflow direction. Outdoor air OA flows into the fresh air intake cavity 103 from the fresh air inlet 141a. The airflow generally flows to the left. The airflow near the front gradually diffuses towards the heat exchange core 130, while the airflow at the rear gradually flows to the left and forward under the guidance of the fresh air guide surface 1441. At the same time, the airflow at the rear affects the flow direction of the airflow in front, causing the airflow in front to flow forward while also moving to the left. Therefore, the fresh air guide surface 1441 can guide some of the leftward-flowing airflow to flow forward towards the heat exchange core 130 in advance, thereby improving the uniformity of the airflow at the heat exchange core 130.

[0096] In some embodiments, the fresh air guiding surface 1441 may be a curved surface. In other embodiments, the fresh air guiding surface 1441 may also be a sloped surface. However, a curved surface has a better air guiding effect than a sloped surface.

[0097] In some embodiments, a guide protrusion 1442 protruding into the fresh air inlet cavity 103 is provided on the side of the fresh air cavity. The guide protrusion 1442 is located near the fresh air inlet 141a and is used to guide part of the airflow from the fresh air inlet 141a in a direction away from the fresh air inlet 141a and closer to the heat exchange core 130.

[0098] Because the airflow near the right end and rear of the fresh air inlet cavity 103 is far from the heat exchange core 130 and its flow direction is almost perpendicular to the heat exchange core 130, this part of the airflow requires a longer path and time to reach the heat exchange core 130. The guide protrusion 1442 can guide the rear airflow that has just exited the fresh air inlet 141a towards the heat exchange core 130, allowing some airflow to reach the heat exchange core 130 more quickly. Furthermore, because the airflow entering through the fresh air inlet 141a flows to the left, the airflow distribution on the right side of the heat exchange core 130 is less. The guide protrusion 1442, located near the right side of the fresh air inlet 141a, can guide more airflow to the right side of the heat exchange core 130, further improving the uniformity of the airflow field at the heat exchange core 130.

[0099] In some embodiments, the guide protrusion 1442 has a first guide side 1443, which extends gradually from one end near the fresh air inlet 141a toward the heat exchange core 130 and away from the fresh air inlet 141a, thereby guiding the airflow to the heat exchange core 130.

[0100] In some embodiments, the guide protrusion 1442 is located at one end of the side of the fresh air cavity away from the first partition wall 143 in the height direction Z.

[0101] Typically, the fresh air inflow surface 130a of the heat exchange core 130 is set at an obtuse angle to the first partition wall 143. This results in the airflow closer to the first partition wall 143 being closer to the heat exchange core 130 in the height direction Z, while the airflow farther from the first partition wall 143 is farther from the heat exchange core 130. The lower airflow is farther from the heat exchange core 130 than the upper airflow. Therefore, by placing the guide protrusion 1442 at the lower end away from the first partition wall 143, more airflow can be guided towards the lower part of the heat exchange core 130, thereby further improving the airflow uniformity at the heat exchange core 130.

[0102] In some embodiments, the guide protrusion 1442 has a second flow guiding side 1444. The second flow guiding side 1444 is connected to one end of the first flow guiding side 1443 that is away from the fresh air inlet 141a, and the second flow guiding side 1444 extends gradually away from the end that is connected to the first flow guiding side 1443 in a direction away from the heat exchange core 130 and away from the fresh air inlet 141a.

[0103] The gradual extension of the second guide side 1444 can reduce the airflow resistance at the second guide side 1444 and reduce the formation of vortices or swirls in the vicinity of the second guide side 1444.

[0104] In some embodiments, the first guide side 1443 and / or the second guide side 1444 are arc surfaces.

[0105] In some embodiments, the first guide side 1443 and the second guide side 1444 are symmetrically arranged on the guide protrusion 1442.

[0106] In some embodiments, the guide protrusion 1442 is provided with a recess 1445. The recess 1445 divides the guide protrusion 1442 into a first guide protrusion 1446 and a second guide protrusion 1447 disposed along the height direction Z. The first guide protrusion 1446 is farther away from the first partition wall 143 than the second guide protrusion 1447, that is, the first guide protrusion 1446 is disposed on the side of the second guide protrusion 1447 that is farther away from the first partition wall 143.

[0107] Airflow tends to form vortices or swirls on the left side of the guide protrusion 1442, and the presence of vortices increases airflow resistance. Some airflow flowing out from the recess 1445 can impact the vortex, thereby using the high-speed airflow flowing out from the recess 1445 to carry away the vortex, effectively preventing the formation of vortices or swirls on the left side of the guide protrusion 1442 and avoiding an increase in airflow resistance within the fresh air duct.

[0108] In some embodiments, the guide protrusion 1442 is provided on the fresh air path forming surface 1440. The end of the first guide side surface 1443 near the fresh air inlet 141a is connected to the inner wall surface of the first air duct sidewall 141 by a rounded transition surface. The end of the second guide side surface 1444 away from the fresh air inlet 141a is connected to the fresh air guide surface 1441 by a rounded transition surface.

[0109] In some embodiments, refer to Figure 7 Projected onto a plane perpendicular to the height direction Z, the line LP1 is defined to pass through the midpoint of the projection line of the fresh air inlet 101a and is parallel to the first direction X, and the guide protrusion 1442 is spaced t1 to the line LP1.

[0110] If the guide protrusion 1442 intersects with line LP1, then the protrusion dimension of the guide protrusion 1442 in the second direction Y is large, which will greatly obstruct the airflow and increase air resistance.

[0111] By setting a gap t1 between the guide protrusion 1442 and the line LP1, this application can ensure that the protrusion size of the guide protrusion 1442 is not too large, which can satisfy its guiding function for airflow and avoid its influence on air resistance.

[0112] In some embodiments, refer to Figure 6 Projected onto a plane perpendicular to the second direction Y, the line LP2 is defined to pass through the midpoint of the projection line of the fresh air inlet 101a and is parallel to the first direction X, and the guide protrusion 1442 is spaced t2 to the line LP2.

[0113] If the guide protrusion 1442 intersects the centerline LP2, then the guide protrusion 1442 has a larger dimension in the height direction Z. The guide protrusion 1442 will guide more airflow to the right side of the heat exchange core 130, which will reduce the airflow on the left side of the heat exchange core 130 and also increase air resistance.

[0114] By setting a gap t2 between the guide protrusion 1442 and the line LP2, this application can avoid the guide protrusion 1442 from being too large in height, ensuring the positive effect of the guide protrusion 1442 on improving the uniformity of the wind field, and avoiding a large impact on air resistance.

[0115] In some embodiments, the total heat exchanger 100 may include a fresh air inlet flange 70 disposed at a fresh air inlet 101a. The fresh air inlet flange 70 is connected to the outside of the first sidewall 107a.

[0116] The recessed portion 1445 corresponds to the internal space of the fresh air inlet flange 70 in the first direction X.

[0117] Projecting onto a plane perpendicular to the second direction Y, draw a line LP3 parallel to the first direction X from the point furthest from the second guide protrusion 1447 on the side of the first guide protrusion 1446 facing the second guide protrusion 1447. Line LP3 coincides with the inner wall surface 70a of the smallest inner diameter of the fresh air inlet flange 70, or line LP3 passes through the interior of the smallest inner diameter of the fresh air inlet flange 70. This ensures that the high-speed airflow from the fresh air inlet flange 70 can flow in a straight line into the recess 1445, thereby achieving the purpose of using high-speed airflow to carry away vortices.

[0118] In some embodiments, the side of the first guide protrusion 1446 away from the second guide protrusion 1447 is flush with the end face of the second partition wall 144, which is also the end face of the windward side air duct component 140 of the core.

[0119] The dimension h1 of the recess 1445 in the height direction Z satisfies: 8mm ≤ h1. If 8mm > h1, then the height of the recess 1445 is small, and the airflow passing through the recess 1445 is less, which will be insufficient to remove the vortex on the left side of the guide protrusion 1442.

[0120] The dimension h1 of the recess 1445 in the height direction satisfies: h1≤20mm. If h1>20mm, with a fixed height dimension of the guide protrusion 1442, the height dimension of the recess 1445 will be larger, and the height dimension of the guide protrusion 1442 will be smaller, thus weakening its function of guiding airflow.

[0121] In some embodiments, 8mm ≤ h1 ≤ 20mm. Within this size range, h1 avoids the generation of vortices or swirls on the left side of the guide protrusion 1442 without affecting its function of guiding airflow.

[0122] In some embodiments, the dimension h2 of the second guide protrusion 1447 in the height direction satisfies: 6mm ≤ h2. If 6mm > h2, then the second guide protrusion 1447 is narrower, and its guiding effect on airflow will be weakened.

[0123] The dimension h2 of the second guide protrusion 1447 in the height direction satisfies: h2≤25mm. If h2>25mm, then the height of the second guide protrusion 1447 is relatively large, and the airflow above the second guide protrusion 1447 in the height direction is far away from the vortex on the left side of the guide protrusion 1447. Thus, the airflow above the second guide protrusion 1447 will not be able to carry away the vortex.

[0124] In some embodiments, 6mm≤h2≤25mm. Within this size range, h2 can both ensure the guiding effect of the second guide protrusion 1447 on the airflow and utilize the airflow above the second guide protrusion 1447 to remove the vortex on the left side of the guide protrusion 1442.

[0125] In some embodiments, refer to Figure 5 The fresh air guide surface 1441 gradually moves away from the heat exchange core 130 from the middle of its height direction in a direction away from the first partition wall 143, so that the lower part of the fresh air guide surface 1441 forms a slope structure.

[0126] In the area of ​​the fresh air inlet cavity 103 that is far from the fresh air inlet 141a, the airflow is prone to generate eddies or vortices, which will not only increase the airflow resistance, but also have a negative impact on the uniformity of the wind field.

[0127] This application, by setting a slope structure at the lower part of the fresh air guide surface 1441, can avoid the generation of eddies or vortices, and can also guide the airflow direction and improve the uniformity of the wind field.

[0128] In some embodiments, refer to Figure 8 Since the portion of the second partition wall 144 near the second air duct side wall 142 is closer to the heat exchange core 130, and its thickness in the second direction Y is thicker, a partial exhaust air inlet cavity 105 can be provided on the second partition wall 144. In this way, the volume of the exhaust air inlet cavity 105 can be maximized, and the resistance on the exhaust side can be reduced.

[0129] Specifically, the exhaust air inlet chamber 105 includes a first exhaust air inlet area 105a. The first exhaust air inlet area 105a is disposed on the second partition wall 144. The second partition wall 144 separates the fresh air inlet chamber 103 and the first exhaust air inlet area 105a in the second direction Y.

[0130] The exhaust air inlet chamber 105 includes a second exhaust air inlet area 105b. The second exhaust air inlet area 105b and the fresh air inlet chamber 104 are located on opposite sides of the first partition wall 143.

[0131] The left end of the first exhaust air intake area 105a is connected to the exhaust air inlet 142a, and the upper end of the first exhaust air intake area 105a is open to connect with the second exhaust air intake area 105b.

[0132] In some embodiments, in the first direction X and along the direction away from the exhaust air inlet 142a, the width of the first exhaust air inlet region 105a gradually decreases in the second direction Y.

[0133] In some embodiments, the second partition wall 143 is provided with a first exhaust air guide surface 1448 and a second exhaust air guide surface 1449. The first exhaust air guide surface 1448 and the second exhaust air guide surface 1449 form a first exhaust air inlet area 105a. The first exhaust air guide surface 1448 and the second exhaust air guide surface 1449 are opposite each other along the second direction Y, and the first exhaust air guide surface 1448 is farther away from the heat exchange core 130 than the second exhaust air guide surface 1449.

[0134] The width of the first exhaust air guide surface 1448 and the second exhaust air guide surface 1449 in the second direction Y gradually decreases along the direction away from the exhaust air inlet 142a.

[0135] The distance between the first exhaust air guide surface 1448 and the heat exchange core 130 is constant. The second exhaust air guide surface 1449 is an inclined surface that gradually moves away from the heat exchange core 130 in a direction away from the exhaust air inlet 142a.

[0136] In some embodiments, the side of the first partition wall 143 facing the second exhaust air inlet area 105b is a third exhaust air guiding surface 1431. The third exhaust air guiding surface 1431 gradually moves away from the fresh air inlet cavity 103 from its middle part in the first direction X along the direction away from the exhaust air inlet 142a. In this way, a slope structure can be formed on the third exhaust air guiding surface 1431. This slope structure can guide the airflow to flow towards the upper right end of the heat exchange core 130, improving the problem of low airflow in the upper right part of the heat exchange core 130. In addition, this slope structure can prevent the airflow from generating eddies or vortices at the position away from the exhaust air inlet 142a, reducing the airflow resistance in the exhaust duct.

[0137] The structure before the installation of the guide protrusion 1442, the recess 1445 and / or the slope structure is called the pre-improvement structure, and the structure after the installation of the guide protrusion 1442, the recess 1445 and / or the slope structure is called the post-improvement structure.

[0138] The inventors, through comparative simulations and experimental measurements of total heat exchangers using the original and improved structures, discovered that:

[0139] In the airflow velocity uniformity test of the fresh air duct, the velocity uniformity before improvement was 83.9%, and after improvement it was 94.3%. In the airflow velocity uniformity test of the exhaust air duct, the velocity uniformity before improvement was 78.5%, and after improvement it was 89.9%.

[0140] In the core's cooling enthalpy efficiency, the original core cooling enthalpy efficiency was 54.8%, while the improved core cooling enthalpy efficiency was 58.3%. In the core's heating enthalpy efficiency, the original core heating enthalpy efficiency was 64.5%, while the improved core heating enthalpy efficiency was 66.8%.

[0141] In the air volume project, at the same fan speed, the air volume increased by 2% after the improvement compared to before the improvement.

[0142] The windward side air duct component 140 of the core in this application improves the uniformity of airflow velocity, core enthalpy efficiency, and air volume. At the same air volume, this application can reduce the fan speed, thereby reducing overall machine noise at the source.

[0143] In some embodiments, refer to Figure 9 and Figure 10 A limiting wall 145 is provided at one end of the first partition wall 143 near the heat exchange core 130. The rear end of the limiting wall 145 is connected to the first partition wall 143, the right end of the limiting wall 145 is connected to the first side wall 107a, and the left end of the limiting wall 145 is connected to the second side wall 107b. The limiting wall 145 is an integrally formed part of the windward side air duct component 140 of the core.

[0144] The total heat exchanger 100 may include a pressure plate for securing the core air duct 140 to the housing 101.

[0145] The pressure plate includes a first pressure plate 171. The first pressure plate 171 abuts against the inner surface of the first air duct sidewall 141 and is connected to the first sidewall 107a, used to fix the right end of the core's windward side air duct component 140. The first pressure plate 171 and the first sidewall 107a clamp the first air duct sidewall 141, which can achieve a tight fit and connection between the right end of the core's windward side air duct component 140 and the housing 101.

[0146] The pressure plate includes a second pressure plate 172. The second pressure plate 172 abuts against the inner side surface of the second air duct sidewall 142 and is connected to the second sidewall 107b, used to fix the left end of the core's windward side air duct component 140. The second pressure plate 172 and the second sidewall 107b clamp the second air duct sidewall 142, which can achieve a tight fit and connection between the left end of the core's windward side air duct component 140 and the housing 101.

[0147] In some embodiments, the pressure plate is provided with a first clamping part 173. The first clamping part 173 is perpendicularly connected to the plate body of the pressure plate and is located near the limiting wall 145 of the pressure plate body.

[0148] The pressure plate can be a sheet metal part. The first clamping part 173 can be formed by bending a portion of the pressure plate.

[0149] The total heat exchanger 100 includes a core air-facing side partition 180. The core air-facing side partition 180 cooperates with the first clamping part 173 to clamp the limiting wall 145 from the height direction Z.

[0150] The first clamping part 173 on the first pressure plate 171 presses against the right side of the limiting wall 145. The first clamping part 173 on the second pressure plate 172 presses against the left side of the limiting wall 145.

[0151] In this application, the first sidewall 107a and the second sidewall 107b are also referred to as limiting sidewalls.

[0152] The left and right ends of the core windward side air duct component 140 are limited by the cooperation of the pressure plate and the limiting side wall. The limiting wall 145 of the core windward side air duct component 140 is limited by the cooperation of the first clamping part 173 on the pressure plate and the core windward side partition 180. This realizes the installation of the core windward side partition 180 in the housing 101.

[0153] In addition, since the core windward side partition 180 and the limiting wall 145 are clamped and fitted together, the limiting wall 145 can be prevented from being too long and deformed, and the gap between the limiting wall 145 and the core windward side partition 180 can be prevented, thus preventing air leakage between the fresh air duct and the exhaust air duct.

[0154] In some embodiments, the first clamping part 173 abuts against the side of the limiting wall 145 facing the fresh air inlet cavity 103, and the core windward side partition 180 abuts against the side of the limiting wall 145 facing the exhaust air inlet cavity 104.

[0155] The first clamping part 173 is located on the fresh air side of the limiting wall 145, so that part of the pressure plate body is located on the fresh air side of the limiting wall 145. In this way, a structure for installing the filter 160 can be provided on the pressure plate body.

[0156] In some embodiments, the core windward side partition 150 includes a partition body portion 181. The partition body portion 181 is the main body portion of the core windward side partition 150.

[0157] The windward side partition 150 of the core includes a second clamping part 182. The second clamping part 182 is connected to the partition body part 181, and the second clamping part 182 is used to cooperate with the first clamping part 173 to clamp the limiting wall 145.

[0158] In some embodiments, a stepped surface is formed at the connection between the second clamping portion 182 and the partition body portion 181. The lower side surface of the second clamping portion 182 is in contact with the upper side surface of the limiting wall 145.

[0159] The stepped surface is in contact with the front end face of the limiting wall 145. The lower side of the partition body 181 may be coplanar with the lower side of the limiting wall 145.

[0160] The windward side partition 180 of the core can be a sheet metal part. The second clamping part 182 is formed by bending the rear end of the partition body part 181.

[0161] In some embodiments, thermal insulation cotton is attached to the side of the partition body 181 facing the fresh air inlet cavity 103 to prevent condensation from forming on the windward side partition 180 of the core due to the large temperature difference between the fresh air side and the exhaust air side. Thermal insulation cotton is also attached to the side of the limiting wall 145 facing the fresh air inlet cavity 103. The thermal insulation cotton can be EPDM cotton.

[0162] In some embodiments, a portion of the first clamping portion 173 abuts against the limiting wall 145, and another portion of the first clamping portion 173 abuts against the partition body portion 181 and is connected by fasteners such as screws. In this way, the first clamping portion 173 is limited by the limiting wall 145 and connected to the windward partition 180 of the core.

[0163] Specifically, the rear portion of the upper side of the first clamping part 173 abuts against the lower side of the limiting wall 145, and the front portion of the upper side of the first clamping part 173 abuts against the partition body part 181.

[0164] In some embodiments, the pressure plate has a folded portion 174 at one end of the windward side duct 140 away from the core in the second direction Y, and the folded portion 174 is connected to the limiting sidewall by fasteners such as screws.

[0165] The front end of the first pressure plate 172 is bent to the right, and then the right end of the bent portion is bent backward to form a folded portion 174. The front end of the second pressure plate 172 is bent to the left, and then the left end of the bent portion is bent backward to form a folded portion 174.

[0166] In some embodiments, the upper end of the limiting sidewall is provided with a flange, which abuts against the upper end surface of the core's windward side air duct component 140. The lower end of the limiting sidewall is provided with a flange, which abuts against the lower end surface of the core's windward side air duct component 140. The flanges on the limiting sidewall can restrict the vertical movement of the core's windward side air duct component 140.

[0167] In some embodiments, the front end of the windward side partition 180 of the core is connected to the first corner 131a of the heat exchange core 130 to separate the fresh air inflow surface 130a and the exhaust air inflow surface 130b of the heat exchange core 130.

[0168] If the limiting wall 145 is connected to the heat exchange core 130, the limiting wall 145 needs to support the heat exchange core 130. Due to the foamed material of the limiting wall 145, its strength is limited, and it is easy to deform and break at the connection with the heat exchange core 130. Therefore, in this application, the core is connected to the heat exchange core 130 through the windward side partition 180.

[0169] In some embodiments, the windward side partition 180 of the core may include a support portion 183. The support portion 183 is connected to one end of the partition body portion 181 away from the second clamping portion 182.

[0170] The support part 183 is provided with a slot, and the first edge 131a of the heat exchange core 130 is located in the slot.

[0171] The support 183 includes two support arms that are generally connected at an angle, one support arm abutting against the fresh air inflow surface 130a and the other support arm abutting against the exhaust air inflow surface 130b.

[0172] The support portion 183 can be formed by bending the front end of the partition body portion 181.

[0173] In some embodiments, the pressure plate is provided with a slot 175. The filter 160 is inserted into the slot 175.

[0174] In this application, the pressure plate is used to limit the position of the windward side air duct component 140 of the core and the filter 160.

[0175] In some embodiments, the pressure plate has two bends 176 that fold inward into the air duct. The gap between the two bends 176 forms a slot 175.

[0176] In some embodiments, the upper end of the filter 160 is close to the partition body portion 181. The windward side partition 180 of the core may include a limiting portion 184. The limiting portion 184 is connected between the partition body portion 181 and the support portion 183, and the limiting portion 184 is connected to the partition body portion 181 at an angle to restrict the filter 160 from moving towards the heat exchange core 130.

[0177] The front end of the partition body 181 is bent forward and downward to form a limiting part 184. The front end of the limiting part 184 is bent to form a support part 183. The limiting part 184 can prevent the upper end of the filter 160 from moving forward.

[0178] In this application, the sealing and limiting of the limiting wall 145 are achieved by the windward side partition 180 of the core, the support of the heat exchange core 130 is achieved, and the limiting of the filter 160 is achieved.

[0179] In some embodiments, a stepped portion 146 is formed at the connection between the limiting wall 145 and the first partition wall 143 to restrict the filter 160 from moving away from the heat exchange core 130. One end of the filter 160 near the partition body portion 181 is located between the limiting portion 184 and the stepped portion 146 in the second direction Y.

[0180] The limiting wall 145 is higher than the first partition wall 143 in the height direction Z, thereby forming a step portion 146 at the connection between the limiting wall 145 and the first partition portion 143. The top of the filter 160 is located in front of the step portion 146, and the step portion 146 can prevent the top of the filter 160 from moving backward.

[0181] In some embodiments, a guide rail may be provided on the inner bottom wall of the housing 101, and the bottom end of the filter 160 is inserted into the guide groove of the guide rail.

[0182] The following is combined Figures 11 to 14 A detailed description of the air outlet side baffle 150 of the core body is provided below:

[0183] Reference Figure 3 , Figure 4 and Figure 11 The core air outlet side partition 150 includes a middle partition 151. The middle partition 151 is located on the core air outlet side and is used to separate the fresh air outlet cavity 104 and the exhaust air outlet cavity 106 along the first direction X.

[0184] Since the fresh air fan 120a is located in the fresh air outlet cavity 104 and the exhaust fan 120b is located in the exhaust outlet cavity 106, the partition 151 is also used to separate the fresh air fan 120a and the exhaust fan 120b.

[0185] The core outlet side baffle 150 includes a fresh air baffle 152. The fresh air baffle 152 is disposed corresponding to the fresh air outlet cavity 104, and in the second direction Y, the fresh air baffle 152 is located between the heat exchange core 130 and the middle baffle 151.

[0186] The fresh air baffle 152 is connected to the third corner 131c and the middle baffle 151 of the heat exchange core 130 to separate the exhaust air outlet surface 130d of the heat exchange core 130 from the fresh air outlet cavity 104. At the same time, since there is no baffle to separate the fresh air outlet surface 130c from the fresh air outlet cavity 104, the air outlet side space of the fresh air outlet surface 130c can be connected to the fresh air outlet cavity 104.

[0187] The core outlet side baffle 150 includes an exhaust baffle 153. The exhaust baffle 153 is disposed corresponding to the exhaust outlet cavity 106, and in the second direction Y, the exhaust baffle 153 is located between the heat exchange core 130 and the middle baffle 151.

[0188] The exhaust baffle 153 is connected to the third corner 131c and the middle baffle 151 of the heat exchange core 130 to separate the fresh air outlet surface 130c of the heat exchange core 130 from the exhaust outlet cavity 106. At the same time, since there is no baffle to separate the exhaust outlet surface 130d from the exhaust outlet cavity 106, the air outlet side space of the exhaust outlet surface 130d can be connected to the exhaust outlet cavity 106.

[0189] In some embodiments, the fresh air baffle 152 includes a first fresh air plate portion 1521. The first fresh air plate portion 1521 extends laterally, and its rear end is connected to a third corner 131c. The first fresh air plate portion 1521 is connected between the fresh air outlet surface 130c and the exhaust air outlet surface 130d.

[0190] The fresh air partition 152 includes a second fresh air panel 1522. The second fresh air panel 1522 extends vertically.

[0191] The second fresh air panel 1522 is opposite to the exhaust outlet surface 130d of the heat exchange core 130 in the second direction Y. The two ends of the second fresh air panel 1522 are connected to the middle partition 151 and the housing 101 respectively in the first direction X, separating the exhaust outlet surface 130d from the fresh air outlet cavity 104.

[0192] Specifically, the rear end of the first fresh air plate 1521 is connected to the third corner 131c of the heat exchange core 130, the upper end of the second fresh air plate 1522 is connected to the front end of the first fresh air plate 1521, the left end of the second fresh air plate 1522 is connected to the second side wall 107b of the housing 101, and the right end of the second fresh air plate 1522 is connected to the lower part of the partition plate 151.

[0193] In some embodiments, the exhaust baffle 153 includes a first exhaust plate portion 1531. The first exhaust plate portion 1531 extends laterally, and its rear end is connected to the third corner 131c. The first exhaust plate portion 1531 is connected between the fresh air outlet surface 130c and the exhaust air outlet surface 130d.

[0194] The exhaust baffle 153 includes a second exhaust baffle portion 1532. The second exhaust baffle portion 1532 extends vertically and is connected to the end of the first exhaust baffle portion 1531 that is away from the heat exchange core 130.

[0195] The second exhaust plate 1532 is opposite to the fresh air outlet surface 130c of the heat exchange core 130 in the second direction Y. The two ends of the second exhaust plate 1532 are connected to the middle partition 151 and the housing 101 respectively in the first direction X, separating the fresh air outlet surface 130c from the exhaust air outlet cavity 106.

[0196] Specifically, the rear end of the first exhaust plate 1531 is connected to the third corner 131c of the heat exchange core 130, the lower end of the second exhaust plate 1532 is connected to the front end of the first exhaust plate 1531, the left end of the second exhaust plate 1532 is connected to the upper part of the middle partition 151, and the right end of the second exhaust plate 1532 is connected to the first side wall 107a of the housing 101.

[0197] The first exhaust plate 1531 and the first fresh air plate 1521 are connected along the first direction X to form a horizontal partition, which is connected to the third corner 131c of the heat exchange core 130. The horizontal partition is used to separate the air outlet space of the fresh air outlet surface 130c and the air outlet space of the exhaust air outlet surface 130d.

[0198] The space enclosed by the first fresh air panel 1521 and the second exhaust panel 1532 is the fresh air connection port 150a. The fresh air inlet chamber 103 is connected to the fresh air outlet chamber 104 through the heat exchange core 130 and the fresh air connection port 150a.

[0199] The space enclosed by the first exhaust panel 1531 and the second fresh air panel 1522 is the exhaust connection port 150b. The exhaust air inlet chamber 105 is connected to the exhaust air outlet chamber 106 through the heat exchange core 130 and the exhaust connection port 150b.

[0200] In some embodiments, combined with Figure 14Projected onto a plane perpendicular to the first direction X, the area S1 enclosed by the second exhaust plate 1532 and the fresh air inflow surface 130c is slightly larger than the area S2 enclosed by the second fresh air plate 1522 and the exhaust air inflow surface 130b, so that the volume of the fresh air inflow space G1 is larger than the volume of the exhaust air inflow space G2, ensuring the balance of resistance between the fresh air side and the exhaust air side.

[0201] The fresh air intake space G1 is the space enclosed by the fresh air outlet surface 130c and the core air outlet side partition 150, and the exhaust air intake space G2 is the space enclosed by the exhaust air outlet surface 130d and the core air outlet side partition 150.

[0202] In some embodiments, refer to Figure 12 In the first direction X, the length L1 of the fresh air baffle 152 is greater than the length L2 of the exhaust baffle 153.

[0203] Because the length L2 of the exhaust baffle 153 is relatively small and the length of the fresh air baffle 152 is relatively large, the proportion of fresh air space on the exhaust side of the heat exchange core 130 in the first direction X is increased, thereby reducing the air resistance on the fresh air side and thus achieving a balance between the resistance on the fresh air side and the exhaust side.

[0204] In some embodiments, refer to Figure 11 The height of the second exhaust panel 1532 is greater than the height of the second fresh air panel 1522. This increases the proportion of fresh air space on the exhaust side of the heat exchange core 130 in the height Z direction, thereby reducing the air resistance on the fresh air side and achieving a balance between the resistance on the fresh air side and the exhaust side.

[0205] In some embodiments, refer to Figure 13 The axes of the fresh air fan 120a and the exhaust fan 120b extend along the second direction Y. The fresh air fan 120a can be rotated 180° around its axis and then translated to coincide with the exhaust fan 120b.

[0206] In the vertical direction Z, the distance R1 from the axis of the fresh air fan 120a to the horizontal partition is greater than the distance R2 from the axis of the exhaust fan 120b to the horizontal partition. This results in a smaller unobstructed area at the air inlets of the fresh air fan 120a and the exhaust fan 120b, thereby further reducing the air resistance on the fresh air side and the exhaust side.

[0207] If the installation directions of the fresh air fan 120a and the exhaust fan 120b are interchanged, the axis of the fresh air fan 120a will change from position O1 to O3, and the area of ​​the air inlet of the fresh air fan 120a that is blocked by the fresh air baffle 152 will increase; the axis of the exhaust fan 120b will change from position O2 to O4, and the area of ​​the air inlet of the exhaust fan 120b that is blocked will also increase.

[0208] In some embodiments, refer to Figure 12The second fresh air panel 1522 gradually moves away from the fresh air fan 120a from the end closest to the partition 151 to the end furthest from the partition 151, which can increase the space between the second fresh air panel 1522 and the fresh air fan 120a, thereby increasing the air intake space J1 of the fresh air fan 120a and reducing the resistance on the fresh air side.

[0209] The second fresh air panel 1522 gradually moves away from the fresh air fan 120a. On the one hand, this increases the space between the second fresh air panel 1522 and the fresh air fan 120a, thereby increasing the air intake space J1 of the fresh air fan 120a and reducing the resistance on the fresh air side. On the other hand, the second fresh air panel 1522 can guide part of the indoor air RA flowing out of the exhaust outlet 130d to the exhaust connection 150b. The guiding effect of the second fresh air panel 1522 can reduce the resistance on the exhaust side and suppress the increase in exhaust side resistance caused by the reduction in the space between the exhaust outlet 130d and the second fresh air panel 1522.

[0210] In some embodiments, the second fresh air panel 1522 is flat. The second fresh air panel 1522 is inclined from the end near the partition 151 to the end away from the partition 151 in a direction away from the fresh air fan 120a.

[0211] In some embodiments, the second exhaust plate portion 1532 gradually moves away from the exhaust fan 120b from the end near the partition plate 151 to the end away from the partition plate 151, which can increase the space between the second exhaust plate portion 1532 and the exhaust fan 120b, thereby increasing the air intake space J2 of the exhaust fan 120b and reducing the resistance on the exhaust side.

[0212] The second exhaust plate 1532 gradually moves away from the exhaust fan 120b. On the one hand, this increases the space between the second exhaust plate 1532 and the exhaust fan 120b, thereby increasing the air intake space J2 of the exhaust fan 120b and reducing the resistance on the exhaust side. On the other hand, the second exhaust plate 1532 can guide some of the outdoor air OA flowing out of the fresh air outlet 130c to the fresh air connection 150a. The guiding effect of the second exhaust plate 1532 can reduce the resistance on the fresh air side and suppress the increase in exhaust side resistance caused by the reduction in the space between the fresh air outlet 130c and the second exhaust plate 1532.

[0213] In some embodiments, the second exhaust plate portion 1532 is flat. The second exhaust plate portion 1532 is inclined from the end near the partition plate 151 to the end away from the partition plate 151 in a direction away from the exhaust fan 120b.

[0214] In some embodiments, projected onto a plane perpendicular to the height direction Z, the connecting line K1 between the first fresh air panel 1521 and the second fresh air panel 1522, and the connecting line K2 between the first exhaust panel 1531 and the second exhaust panel 1532 are defined. The angle between the connecting line K1 and the second direction Y is α1, and the angle between the connecting line K2 and the second direction Y is α2, where α1 ≥ α2.

[0215] α1≥α2 indicates that the second exhaust panel 1532 is tilted further away from the fan than the second fresh air panel 1522. Since the area of ​​the second exhaust panel 1532 is larger than that of the second fresh air panel 1522, the second exhaust panel 1532 obstructs a larger area of ​​the exhaust fan 120b. By tilting the second exhaust panel 1532 slightly, the resistance reduction on the fresh air side and the exhaust air side can be made to be similar, without increasing the resistance difference between the fresh air side and the exhaust air side, thus ensuring the resistance balance between the fresh air side and the exhaust air side.

[0216] In some embodiments, α1-α2 ≤ 1.6°. If α1-α2 > 1.6°, it will cause a large difference in resistance between the fresh air side and the exhaust air side. For example, α1 = 84.3°, α2 = 83.5°.

[0217] In some embodiments, the second fresh air plate portion 1522 is inclined from the end of it connected to the first fresh air plate portion 1521 to the end of it away from the first fresh air plate portion 1521 in a direction away from the heat exchange core 130.

[0218] Inclining the second fresh air plate 1522 away from the heat exchange core 130 can increase the exhaust air flow space G2, avoiding the problem that the exhaust side resistance is reduced by a small amount and the exhaust air volume flowing out of the core is reduced due to the exhaust air flow space G2 being too small.

[0219] In some embodiments, the second exhaust plate portion 1532 is inclined from the end where it is connected to the first exhaust plate portion 1531 to the end where it is away from the first exhaust plate portion 1531 in a direction away from the heat exchange core 130.

[0220] Inclining the second exhaust fan 1532 away from the heat exchange core 130 can increase the fresh air inflow space G1, avoiding the problem that the overall reduction in fresh air resistance is small and the fresh air volume flowing out of the core is reduced due to the fresh air inflow space G1 being too small.

[0221] In some embodiments, the angle between the second fresh air panel 1522 and the first fresh air panel 1521 is β1, and the angle between the second exhaust panel 1532 and the first exhaust panel 1531 is β2, where β1 < β2.

[0222] β1 < β2, indicating that the second fresh air plate 1522 is tilted further away from the heat exchange core 130 than the second exhaust plate 1532. Since the first fresh air plate 1522 covers a smaller area of ​​the fresh air fan 120a, setting β1 larger can increase the exhaust air inflow space G2 without significantly reducing the air intake space J1 of the fresh air fan 120a. This allows the resistance reduction on the fresh air side and the exhaust air side to be similar, without increasing the resistance difference between the fresh air side and the exhaust air side, thus ensuring a resistance balance between the fresh air side and the exhaust air side.

[0223] In some embodiments, 1°≤β2-β1≤3°, within which the resistance difference between the fresh air side and the exhaust air side can be kept small. For example, β1=85°, β2=87°.

[0224] By improving the air outlet side baffle 150 of the core, the second fresh air baffle 1522 is gradually moved away from the fresh air fan 120a in the horizontal direction and gradually moved away from the heat exchange core 130 in the vertical direction; the second exhaust baffle 1532 is gradually moved away from the exhaust fan 120b in the horizontal direction and gradually moved away from the heat exchange core 130 in the vertical direction, which can reduce the resistance on both the fresh air side and the exhaust side.

[0225] Laboratory tests showed that after the improvement of the core air outlet side baffle 150, the resistance on the fresh air side was 214 Pa and the resistance on the exhaust side was 212 Pa, which basically achieved resistance balance. The difference in the speed of the fresh and exhaust air was within 10 rpm, and there was no beat frequency noise. Compared with the resistance before the improvement, the resistance on the fresh air side was reduced by 12.8 Pa and the resistance on the waste air side was reduced by 8.8 Pa in this application.

[0226] In some embodiments, the end of the second fresh air panel 1522 away from the middle partition 151, and / or the end of the second exhaust panel 1532 away from the middle partition 151, is provided with a folded edge. This folded edge is used to connect to the housing 101 by screws. The folded edge forms an angle γ with the second direction Y, where γ = 0.5°-1°. The angle γ can prevent the folded edge from interfering with the side wall of the housing 101 and reduce the vibration noise between the partition and the housing 101.

[0227] In some embodiments, refer to Figure 11 The rear end of the air outlet side partition 150 of the core is provided with a slot, and the third corner 131c of the heat exchange core 130 is engaged with the slot.

[0228] The rear end of the first fresh air panel 1521 is provided with a first folded edge portion that slopes backward and upward. A core support plate 153 is connected to the lower side of the first fresh air panel 1521, and the rear end of the core support plate 153 is provided with a second folded edge portion that slopes backward and downward. The first folded edge portion and the second folded edge portion form a groove.

[0229] The rear end of the first exhaust panel 1531 is provided with a third folded edge that slopes downwards and backwards. A core support plate 153 is connected to the upper side of the first exhaust panel 1531, and the rear end of the core support plate 153 is provided with a fourth folded edge that slopes upwards and backwards. The third folded edge and the fourth folded edge form a groove.

[0230] In some embodiments, the fresh air baffle 152 is a sheet metal part, and the second fresh air baffle portion 1522 can be formed by bending the front end of the first fresh air baffle portion 1521 downward. The exhaust baffle 153 is a sheet metal part, and the second exhaust baffle portion 1532 can be formed by bending the front end of the first exhaust baffle portion 1531 upward.

[0231] In some embodiments, the fresh air baffle 152 and the exhaust air baffle 153 may be a single piece or two connected pieces.

[0232] In some embodiments, the first fresh air panel 1521 and the first exhaust air panel 1531 are connected by overlapping. The lower surface of the first fresh air panel 1521 abuts against the upper surface of the first exhaust air panel 1531.

[0233] In some embodiments, the front end of the partition plate 151 is provided with a folded edge, which is connected to the fourth side wall 107d of the housing 101 by screws. The upper rear end of the partition plate 151 is provided with a right-facing folded edge, which is connected to the left end of the second exhaust panel 1532 by screws. The lower rear end of the partition plate 151 is provided with a left-facing folded edge, which is connected to the right end of the second fresh air panel 1522 by screws. The left end of the second fresh air panel 1522 is provided with a rearward folded edge, which is connected to the second side wall 107b by screws. The right end of the second exhaust panel 1532 is provided with a rearward folded edge, which is connected to the first side wall 107a by screws.

[0234] The following is combined Figures 15 to 20 A detailed introduction to the fan:

[0235] In some embodiments, the fresh air fan 120a and the exhaust fan 120b are centrifugal fans with the same structure and can be used interchangeably.

[0236] The fan's axis is perpendicular to the height direction Z, and one of the fan's air inlets faces the heat exchange core 130. In the current example, the fan's axis extends along the second direction Y; the fresh air outlet 101b is located on the second side wall 107b, and the exhaust air outlet 101d is located on the first side wall 107a.

[0237] In some embodiments, refer to Figure 15 The fan includes an impeller 121. The impeller 121 includes a disk 1211 and multiple blades connected to the outer periphery of the disk 1211.

[0238] The fan includes a volute 122. An impeller 121 is connected inside the volute 122. A first fan inlet 122a is provided on the rear wall of the volute 122, and a volute outlet 122b is provided at the end of the volute 122 away from the middle partition 151. The volute outlet 122b of the fresh air fan 120a is connected to the fresh air outlet 101b, and the volute outlet 122b of the exhaust fan 120b is connected to the exhaust outlet 101d.

[0239] Driven by the impeller 121, air can enter the volute 122 through the first fan inlet 122a and then flow out from the volute outlet 122b.

[0240] There is a gap between the volute 122 of the fresh air fan 120a and the fresh air baffle 152, so that the air in the fresh air outlet chamber 104 can flow through the gap to the first fan inlet 122a of the fresh air fan 120a. There is a gap between the volute 122 of the exhaust fan 120b and the exhaust baffle 153, so that the air in the exhaust outlet chamber 106 can flow through the gap to the first fan inlet 122a of the exhaust fan 120b.

[0241] The fan includes a volute fixing plate 123 for connecting to the housing 101, thereby fixing the fan inside the housing 101. The volute fixing plate 123 is connected to the end of the volute 122 away from the heat exchange core 130. The volute fixing plate 123 has a through second fan inlet 123a. The second fan inlet 123a is opposite to the first fan inlet 122a.

[0242] The fan includes a motor 124. The motor 124 is installed at the air inlet 123a of the second fan. The output shaft of the motor 124 is connected to the disc 1211 of the impeller 121 to serve as the driving source for the rotation of the impeller 121. When the motor 124 is energized, its output shaft rotates to drive the impeller 121 to rotate.

[0243] The fan includes a motor bracket 125. The motor bracket 125 and the volute 122 are respectively connected to both sides of the volute fixing plate 123. The motor 124 is fixedly connected to the motor bracket 125.

[0244] In some embodiments, the motor bracket 125 includes a motor mounting portion 1251. The motor mounting portion 1251 extends vertically and is generally parallel to the body of the volute mounting plate 123, with a gap between the motor mounting portion 1251 and the volute mounting plate 123. The front end of the motor 124 is located outside the second fan inlet 123a for connection with the motor mounting portion 1251.

[0245] The motor bracket 125 includes a bracket connecting portion 1253. The bracket connecting portion 1253 is located at both ends along the length of the motor bracket 125. The bracket connecting portion 1253 is connected to the volute fixing plate 123.

[0246] The motor bracket 125 includes a transition connection portion 1252. The transition connection portion 1252 connects the motor fixing portion 1251 and the bracket connection portion 1252.

[0247] In some embodiments, the two ends of the motor bracket 125 in the width direction and the volute fixing plate 123 form a first airflow inlet 125a. One of the first airflow inlets 125a faces the middle partition plate 151.

[0248] The volute fixing plate 123 has a first airflow communication portion 123b at one end near the middle partition plate 151. Figure 12 There is a gap between the volute fixing plate 123 and the middle partition plate 151, which forms an airflow channel 109.

[0249] When the fan is running, some of the air from the heat exchange core can flow through the airflow channel 109 and the first airflow connecting part 123b to the first airflow inlet 125a, and then to the second fan inlet 123a, thus realizing the forward airflow of the fan.

[0250] Since the air outlet of the fan is connected to the side wall of the housing 101, and in order to ensure the miniaturization design of the total heat exchanger 100, the upper and lower ends of the fan are also connected to the top and bottom walls of the housing 101. Therefore, the airflow behind the volute fixing plate 123 cannot flow to the front of the volute fixing plate 123 through the upper and lower ends of the fan and the end where the volute air outlet 122b is located. This results in the fan only being able to achieve single-sided air intake, that is, only the first fan air inlet 122a can be used for air intake, and it is impossible to achieve double-sided air intake.

[0251] Therefore, by providing an airflow channel 109 between the volute fixing plate and the partition plate 151, and by providing a first airflow connecting part 123b at one end of the volute fixing plate 123 near the partition plate 151, airflow can flow through the airflow channel 109 and the first airflow connecting part 123b to the second fan inlet 123a. In addition, by providing a first airflow inlet 125a facing the partition plate 151, the first airflow inlet 125a is relatively close to the airflow channel 109, thereby shortening the flow path of the airflow to the second fan inlet 123a, reducing flow resistance, and increasing the air intake volume of the second fan inlet 123a.

[0252] In some embodiments, the motor bracket 125 extends along the height direction Z in the length direction, such that two first airflow inlets 125a are arranged along the first direction X, thereby making one of the first airflow inlets 125a close to the airflow channel 109.

[0253] In some embodiments, the transition connection 1252 is provided with a through second airflow inlet 125b for airflow to reduce the obstruction of air by the motor bracket 125.

[0254] The airflow in the airflow channel 109 can flow into the second fan inlet 123a through the first airflow inlet 125a and the second airflow inlet 125b, thereby increasing the air intake path of the second fan inlet 123a and further increasing the air intake volume of the fan.

[0255] In some embodiments, refer to Figure 17 Projected onto the surface of the volute fixing plate 123, the volute fixing plate 123 has an area near the volute tongue 1221 that does not coincide with the volute 122, which is called the empty area 1237.

[0256] A second airflow communication portion 123c is provided in the empty area 1237 of the volute fixing plate 123, and the second airflow communication portion 123c is located near the volute tongue 1221 of the volute 122.

[0257] The second airflow connecting part 123c directly connects the two sides of the volute fixing plate 123. When the fan is running, some air flows through the second airflow connecting part 123c to the first airflow inlet 125a and the second airflow inlet 125b. The second airflow connecting part 123c increases the air intake path of the second fan inlet 123a, further increasing the air intake volume of the fan.

[0258] In some embodiments, the second airflow communication portion 123c has a plurality of portions arranged along the circumferential direction of the volute 122. If the second airflow communication portion 123c is configured as a large hole, it will affect the structural strength of the volute fixing plate 123. Therefore, configuring the second airflow communication portion 123c as a plurality of smaller holes will not affect the structural strength of the volute fixing plate 123.

[0259] In the current example, there are two second airflow communication portions 123c. Under the premise of ensuring that the structural strength of the volute fixing plate 123 is not affected, the area of ​​each second airflow communication portion 123c is maximized as much as possible, thereby reducing the resistance of airflow through the second airflow communication portion 123c and increasing the ventilation volume through the second airflow communication portion 123c.

[0260] In some embodiments, the second airflow communication portion 123c is generally triangular in shape and is formed by a first surface 1238a, a second surface 1238b, and a third surface that are connected end to end.

[0261] The first surface 1238a is located near the circumference of the volute 122 and is arc-shaped. The curvature and extension direction of the arc of the first surface 1238a can be close to the circumference of the volute 122.

[0262] In some embodiments, the volute 122 has a diffuser wall 1222 connected between the volute tongue 1221 and the volute outlet 122b.

[0263] The second surface 1238b is close to the diffuser wall 1222 of the volute tongue 1221. The second surface 1238b is parallel to the diffuser wall 1222 or the angle between them is δ≤30°. The angle δ between the second surface 1238b and the diffuser wall 1222 is relatively small so as to make full use of the empty area 1237 and make the area of ​​the first airflow connecting part 123b as large as possible.

[0264] If the second surface 1238b is a curve, then δ is the angle between the tangent at a point on the second surface 1238b and the diffuser wall 1222.

[0265] In some embodiments, the three surfaces of the second airflow connecting portion 123c are connected in pairs by arc transition surfaces. The included angle between any two surfaces is in the range of 50° to 70° to avoid the problem of high wind resistance in sharp corner areas.

[0266] In some embodiments, refer to Figure 16 The volute fixing plate 123 includes a fixing plate body 1231. The fixing plate body 1231 is the main part of the volute fixing plate 123.

[0267] The volute fixing plate 123 includes a reinforcing support portion 1232. The reinforcing support portion 1232 extends from the end of the fixing plate body 1231 away from the volute air outlet 122b in a direction away from the volute 122.

[0268] The rear end of the reinforcing support part 1232 is connected to the fixing plate body 1231, and the front end of the reinforcing support part 1232 is connected to the housing 101 to strengthen the connection strength between the volute fixing plate 123 and the housing 101 and reduce structural noise.

[0269] In some embodiments, the upper end of the reinforcing support 1232 is spaced from the upper end of the fixing plate body 1231, and this space can serve as the first airflow communication part 123b.

[0270] The lower end of the reinforcing support 1232 is spaced from the lower end of the fixing plate body 1231, and this spaced distance can serve as the first airflow communication part 123b.

[0271] In some embodiments, the reinforcing support 1232 has a first inclined side 12321 that is inclined downward from its upper end and away from the fixing plate body 1231, and a second inclined side 12322 that is inclined upward from its lower end and away from the fixing plate body 1231.

[0272] The arrangement of the first inclined side 12321 and the second inclined side 12322 can ensure that the structural strength of the reinforced support part 1232 is not affected, and can also reduce the area of ​​the reinforced support part 1232. The upper and lower sides of the reinforced support part 1232 form a space, which can be used as the first airflow communication part 123b to allow airflow communication.

[0273] In some embodiments, the first airflow communication portion 123b is disposed on the reinforcing support portion 1232.

[0274] The first airflow connecting portion 123b on the reinforcing support portion 1232 is elliptical and has two portions arranged vertically. The major axis of the upper second airflow connecting portion 123c is parallel to or at an acute angle to the first inclined side 12321, and the major axis of the lower second airflow connecting portion 123c is parallel to or at an acute angle to the second inclined side 12322, so as to make full use of the reinforcing support portion 1232 and make the area of ​​the first airflow connecting portion 123b on the reinforcing support portion 1232 as large as possible.

[0275] In some embodiments, refer to Figure 18 The two ends of the impeller 121 along the axial direction are the first end and the second end of the impeller 121, respectively. The motor 124 is connected to the disk 1211 from the second end of the impeller 121.

[0276] The distance from the first end of the disc 1211 to the impeller 121 is m1, and the distance from the second end of the disc 1211 to the impeller 121 is m2, where 2 ≤ m1 : m2 ≤ 4. This allows the disc 1211 to deviate from the center of the impeller 121 and be closer to the motor 124.

[0277] Since the air inlet 122a of the first fan faces the direction of incoming flow, while the air inlet 123a of the second fan faces away from the direction of incoming flow, there is a significant difference in the air volume of the two air inlets. By setting the position of the disc 1211 according to the different air volumes on both sides, satisfying 2≤m1:m2≤4, the air volume of the fan can be guaranteed to meet the requirements.

[0278] In some embodiments, refer to Figure 3 , Figure 19 and Figure 20 The first side wall 107a and the second side wall 107b of the housing 101 are each provided with a first slot 30a, and one end of the volute fixing plate 123 on the same side as the volute air outlet 122b is inserted into the first slot 30a.

[0279] Specifically, the left end of the volute fixing plate 123 of the fresh air fan 120a is inserted into the first slot 30a on the second side wall 107b; the right end of the volute fixing plate 123 of the exhaust fan 120b is inserted into the first slot 30a on the first side wall 107a.

[0280] A fastening connection is provided inside the housing 101, and the fastening connection is located on the side of the volute fixing plate 123 away from the volute. The end of the volute fixing plate 123 away from the volute air outlet 122b is detachably connected to the fastening connection by screws.

[0281] In this application, the air outlet end of the fan is set to a plug-in type to replace the screw connection, which can improve the efficiency of fan assembly and disassembly and can realize the assembly and disassembly of the fan from the lower maintenance port 108b.

[0282] In some embodiments, the top wall of the housing 101 is provided with a second slot, and the top end of the volute fixing plate 123 is hooked into the second slot. The top end of the volute fixing plate 123 is hooked in a hooking manner, which facilitates efficient assembly and disassembly; since the top end of the volute fixing plate 123 is limited, vibration noise can be avoided at its top end when the fan is running.

[0283] In some embodiments, the volute fixing plate 123 includes a first fixing connection portion 1233. The first fixing connection portion 1233 extends from one end of the fixing plate body 1231 on the same side as the volute air outlet 122b in a direction away from the volute 122, and the first fixing connection portion 1233 can enhance the structural strength of the volute fixing plate 123.

[0284] A first limiting member 30 is connected to the side wall of the connecting volute air outlet 122b of the housing 101. The first limiting member 30 has a first limiting wall 31 and a second limiting wall 32, and a first slot 30a is formed between the first limiting wall 31 and the second limiting wall 32. The first limiting wall 31 abuts against the side of the fixing plate body 1231 facing the volute 122, and the second limiting wall 32 abuts against the side of the first fixed connection part 1233 away from the fixing plate body 1231.

[0285] The fan can move along the first direction X so that the first fixed connection part 1233 can be inserted into the first slot 30a or pulled out from the first slot 30a.

[0286] In some embodiments, the first limiting member 30 is a "U"-shaped member, whose bottom wall is connected to the housing 101, and whose opposite side walls are the first limiting wall 31 and the second limiting wall 32, respectively.

[0287] In some embodiments, the opening ends of the first limiting wall 31 and the second limiting wall 32 are flared outwards, which can facilitate the first fixed connection part 1233 to be inserted into the first limiting member 30.

[0288] In some embodiments, the first limiting member 30 has two members arranged vertically, which respectively cooperate with the upper and lower ends of the first fixed connection portion 1233.

[0289] In some embodiments, the volute fixing plate 123 may include a second fixing connection portion 1234, which extends from the top end of the fixing plate body 1231 in a direction away from the volute 122.

[0290] A second limiting member 40 is provided on the inner top wall of the housing 101. The second limiting member 40 has a first connecting wall 41 and a second connecting wall 42. The first connecting wall 41 is used to connect with the inner top wall of the housing, and the second connecting wall 42 is connected with the first connecting wall 41.

[0291] The connection between the second connecting wall 42 and the first connecting wall 41 is stepped, so that the height of the second connecting wall 42 is lower than that of the first connecting wall 41, thereby forming a gap space between the second connecting wall 42 and the inner top wall of the housing 101. This gap space is the second slot. The lower end face of the second fixed connection part 1234 abuts against the upper end face of the second connecting wall 42.

[0292] In some embodiments, the second connecting wall 42 is connected to one end of the first connecting wall 41 near the volute fixing plate 123, that is, the second connecting wall 42 is located at the rear end of the first connecting wall 41.

[0293] In some embodiments, the second limiting member 40 has a first fastening connection portion 43 at one end away from the volute air outlet 122b. The first fastening connection portion 43 can be connected to the second connecting wall 42.

[0294] The front end face of the fixing plate body 1231 abuts against the rear end face of the first fastening connection part 43, and screws are inserted through the fixing plate body 1231 to connect with the first fastening connection part 43.

[0295] In some embodiments, a third limiting member 50 is connected to the bottom wall of the housing 101. The third limiting member 50 includes a third connecting wall 51 and a second fastening connection portion 52. The third connecting wall 51 is used to connect to the bottom wall of the housing.

[0296] The second fastening connection 52 is perpendicularly connected to the wall 51 of the third connection. The front end face of the fixing plate body 1231 abuts against the rear end face of the second fastening connection 52, and screws are inserted through the fixing plate body 1231 to connect with the second fastening connection 52.

[0297] In some embodiments, the third limiting member 50 may include a fourth connecting wall 53. The fourth connecting wall 53 is perpendicularly connected to the third connecting wall 51 and is arranged with the second fastening connection portion 52 along the first direction X.

[0298] The volute fixing plate 123 may include a third fixing connection portion 1236. The third fixing connection portion 1236 extends from the bottom end of the fixing plate body 1231 in a direction away from the volute 122. The third fixing connection portion 1236 abuts against the fourth connecting wall 53 to limit the bottom end of the volute fixing plate 123 through the fourth connecting wall 53, thereby reducing the vibration of the bottom end of the volute fixing plate 123 during the operation of the fan and reducing noise.

[0299] In some embodiments, the third fixed connection portion 1236 and the second fastening connection portion 52 have a clearance interval in the first direction X, and the length h1 of the clearance interval is not less than the depth h0 of the first fixed connection 1233 inserted into the first slot 30a.

[0300] When disassembling the fan for maintenance, it is necessary to move the fan along the first direction X so that the first fixed connection part 1233 of the fan disengages from the first slot 30a. Therefore, the fan needs to move at least h0 along the first direction X. During the movement of the fan by h0, h1 is not less than h0, which ensures that the third fixed connection part 1236 will not collide with the second fastening connection part 52.

[0301] In some embodiments, a fourth limiting member 60 is connected to the fourth side wall 107d of the housing 101. The fourth limiting member 60 has a fifth connecting wall 61 and a sixth connecting wall 62. The fifth connecting wall 61 is used to connect with the fourth side wall 107d of the housing 101, and the connection of the fifth connecting wall 61 of the sixth connecting wall 62 is stepped, so that a gap is formed between the sixth connecting wall 62 and the fourth side wall 107d, which is a third slot.

[0302] The end of the reinforcing support 1232 away from the fixing plate body 1231 is provided with a folded edge, which is inserted into the third slot.

[0303] In some embodiments, the sixth connecting wall 62 is located at the end of the fifth connecting wall 61 that is away from the volute outlet 122b. The folded edge extends from the end connected to the reinforcing support 1232 toward the volute outlet 122b. This allows the folded edge to be inserted into or pulled out of the third slot along the first direction X.

[0304] In some embodiments, refer to Figure 2 and Figure 21 The housing 101 includes a base plate 108a. The base plate 108a has a through maintenance port 108b. Normally, the maintenance port 108b is provided corresponding to the heat exchange core 130.

[0305] The housing 101 includes a maintenance plate 108c. The maintenance plate 108c covers the maintenance port 108b and is connected to the base plate 108a, and is used to open and close the maintenance port 108b.

[0306] The heat exchange core 130 comprises multiple sections arranged along a first direction X. Projected onto the surface of the base plate 108a, one section of the heat exchange core 130 is located at the service port 108b, allowing the heat exchange core 130 to be removed from the service port 108b. In the current example, the heat exchange core 130 has two sections. When the heat exchange core 130 is disassembled, the section corresponding to the service port 108b is removed first, and then the other section is pulled to the service port 108b for removal. It should be noted that the detachable connection structure of the heat exchange core 130 within the housing 101 is applicable to the prior art and will not be described in detail here.

[0307] When the fan needs to be inspected, the heat exchange core 130 can be removed from the maintenance port 108b first. Then, part or all of the air outlet side baffle 150 of the core can be removed from the maintenance port 108b. Then, the fan can be disassembled: first, unscrew the screws on the side of the fan near the middle baffle 151, then move the fan in the first direction X towards the middle baffle 151 so that the fan is disengaged from the first slot 30a and the third slot. Finally, the fan can be removed from the maintenance port 108b.

[0308] In some embodiments, when projected onto the bottom plate of the housing 101, a portion of the partition plate 151 is located inside the maintenance port 108b, or a portion of the partition plate 151 is adjacent to the maintenance port 108b, such that the positions of the partition plate 151 and the screws on the fan are relatively close to the maintenance port 108b, to facilitate the operation of removing and installing screws.

[0309] In some embodiments, the fresh air baffle 152 or the exhaust baffle 153 is projected onto the bottom plate of the housing 101 and is located inside the maintenance port 108b to facilitate the disassembly and assembly of the fresh air baffle 152 or the exhaust baffle 153.

[0310] Taking the fresh air baffle 152 located inside the maintenance port 108b as an example: When it is necessary to remove the fresh air fan 120a, after removing the heat exchange core 130, it is necessary to remove the fresh air baffle 152: unscrew the screws connecting the fresh air baffle 152 to the housing 101 and the screws connecting the fresh air baffle 152 to the middle baffle 151 from the maintenance port 108b; remove the fresh air baffle 152 and then disassemble the fresh air fan 120a.

[0311] When it is necessary to remove the exhaust fan 120b, in addition to removing the fresh air baffle 152 and the fresh air fan 120a, the middle baffle 151 also needs to be removed, following the steps above: unscrew the screws connecting the middle baffle 151 to the housing 101, remove the middle baffle 151, and then disassemble the exhaust fan 120b. Alternatively, it is not necessary to remove the fresh air fan 120a; simply remove all the baffles 150 on the air outlet side of the core body, and then disassemble the exhaust fan 120b.

[0312] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0313] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the described embodiments and various different variations of embodiments suitable for specific use considerations.

Claims

1. A total heat exchanger, characterized in that, include: The housing has two limiting sidewalls disposed opposite to each other along a first direction, the two limiting sidewalls being a first sidewall and a second sidewall, respectively. A heat exchange core is disposed inside the housing. The length direction of the heat exchange core extends along a first direction. The two sides of the second direction of the heat exchange core are the windward side and the air outlet side of the heat exchange core, respectively. The second direction, the first direction, and the height direction are perpendicular to each other. A core-side air duct component is provided on the windward side of the heat exchange core, and a fresh air inlet cavity and an exhaust air inlet cavity are formed on the core-side air duct component. A core air outlet side partition is provided on the air outlet side of the heat exchange core, and the core air outlet side partition is used to separate the fresh air outlet chamber and the exhaust air outlet chamber; The core windward side air duct component is a one-piece molded foam component, which includes: The first air duct sidewall and the second air duct sidewall are arranged opposite to each other along the first direction; A first partition wall connects the first air duct sidewall and the second air duct sidewall, and is used to separate the fresh air inlet cavity and the exhaust air inlet cavity in the height direction; A limiting wall is provided at one end of the first partition wall near the heat exchange core; The total heat exchanger also includes: Two pressure plates, namely a first pressure plate and a second pressure plate, the first pressure plate clamps the first air duct sidewall with the first sidewall, and the second pressure plate clamps the second air duct sidewall with the second sidewall. The pressure plate is provided with a first clamping part, which abuts against the limiting wall. The windward side partition of the core abuts against the side of the limiting wall away from the first clamping part and is connected to the first clamping part.

2. The total heat exchanger according to claim 1, characterized in that, The core windward side partition includes: Partition body section; The second clamping part is connected to the end of the partition body that is away from the heat exchange core. The second clamping part is used to cooperate with the first clamping part to clamp the limiting wall. A portion of the first clamping part abuts against the limiting wall, and another portion of the first clamping part is connected to the partition body part by fasteners.

3. The total heat exchanger according to claim 2, characterized in that, The windward side partition of the core also includes: The support portion is connected to the end of the partition body portion away from the second clamping portion. The support portion is provided with a slot, and one corner of the heat exchange core is located in the slot.

4. The total heat exchanger according to claim 2, characterized in that, The pressure plate is provided with slots; The total heat exchanger also includes: A filter for filtering air is inserted into the slot.

5. The total heat exchanger according to claim 4, characterized in that, The filter is attached to the partition body at one end in the height direction; The windward side partition of the core also includes: A limiting part is connected between the partition body and the support part, and the limiting part is connected to the partition body at an angle to restrict the filter from moving towards the heat exchange core.

6. The total heat exchanger according to claim 5, characterized in that, A stepped portion is formed at the connection between the limiting wall and the first partition wall to restrict the filter from moving away from the heat exchange core.

7. The total heat exchanger according to claim 2, characterized in that, Insulating cotton is attached to the surface of the partition body facing the fresh air inlet cavity.

8. The total heat exchanger according to claim 1, characterized in that, The end of the pressure plate on the windward side of the core, away from the windward air duct in the second direction, is connected to the limiting sidewall by fasteners.

9. The total heat exchanger according to claim 1, characterized in that, The limiting sidewall has a flange at its end in the height direction, and the flange abuts against the windward side air duct of the core.

10. A total heat exchanger, characterized in that, include: The housing has two limiting sidewalls disposed opposite to each other along a first direction, the two limiting sidewalls being a first sidewall and a second sidewall, respectively. A heat exchange core is disposed inside the housing. The length direction of the heat exchange core extends along a first direction. The two sides of the second direction of the heat exchange core are the windward side and the air outlet side of the heat exchange core, respectively. The second direction, the first direction, and the height direction are perpendicular to each other. A core-side air duct component is provided on the windward side of the heat exchange core, and a fresh air inlet cavity and an exhaust air inlet cavity are formed on the core-side air duct component. A core air outlet side partition is provided on the air outlet side of the heat exchange core, and the core air outlet side partition is used to separate the fresh air outlet chamber and the exhaust air outlet chamber; The core windward side air duct component is a one-piece molded foam component, which includes: The first air duct sidewall and the second air duct sidewall are arranged opposite to each other along the first direction; A first partition wall connects the first air duct sidewall and the second air duct sidewall, and is used to separate the fresh air inlet cavity and the exhaust air inlet cavity in the height direction; A limiting wall is provided at one end of the first partition wall near the heat exchange core; The total heat exchanger also includes: Two pressure plates, namely a first pressure plate and a second pressure plate, the first pressure plate clamps the first air duct sidewall with the first sidewall, and the second pressure plate clamps the second air duct sidewall with the second sidewall. The pressure plate is provided with a first clamping part, which abuts against the side of the limiting wall facing the fresh air inlet cavity. The windward side partition of the core is connected to the first clamping part and abuts against the side of the limiting wall facing the exhaust and air inlet chamber.

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