Heat exchanger

Abstract

The utility model discloses a heat exchanger which comprises an outer frame body and a heat exchange core body arranged in the outer frame body. The outer frame body comprises a square main body frame, a mounting frame arranged in the main body frame, a mask fixed in the circumferential direction of the main body frame, and cover plates arranged at the top and the bottom of the main body frame; a fresh air outlet, an exhaust air inlet, an exhaust air outlet and a fresh air inlet are respectively formed in the two opposite masks; the heat exchange core body is mounted in the mounting frame; a fresh air channel communicated with the fresh air inlet and the fresh air outlet is arranged in the heat exchange core body; and an exhaust channel communicated with the exhaust air outlet and the exhaust air inlet is arranged in the heat exchange core body. The heat exchanger has the advantages that the main body frame is designed on the outer frame body of the heat exchanger and used for supporting the mask, the installation frame is designed in the main body frame and used for installing the heat exchange core body, the main body frame and the installation frame are fixedly connected, the installation frame and the heat exchange core body are fixedly connected, and the overall strength of the heat exchanger is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange, and particularly relates to a heat exchanger. Background Art

[0002] A heat exchanger is a commonly used device in the field of building energy conservation. A fresh air heat exchanger has the function of recovering the waste heat of the exhaust air, which can significantly reduce the heating and cooling loads brought by the fresh air in the building.

[0003] At present, the existing fresh air heat exchangers are generally designed for normal pressure or low-pressure gas conditions and can meet the application requirements of most occasions. The existing heat exchangers mainly include a shell and a heat exchange core body. The shell forms an air flow channel for the inlet and exhaust air through baffles. The shell of the fresh air heat exchanger mostly uses ultra-thin materials such as thin iron sheets, and simple support members are arranged inside for support, and the heat exchange core body is directly installed inside the shell. The heat exchange core body is divided into a total heat recovery core body and a sensible heat recovery core body according to the energy recovery method. The sensible heat recovery core body is formed by the cross-intersection of aluminum films to form an air flow channel for the inlet and exhaust air.

[0004] However, for a pressurized building, because the pressure inside the building is much higher than the pressure outside the building, high-strength requirements are put forward for the fresh air heat exchanger. The shell of the fresh air heat exchanger needs to not undergo obvious visible deformation above 50 kPa. The structure of the existing heat exchanger shell with thin iron sheets and simple component supports is obviously not strong enough to bear the pressure, and it will deform under a large pressure difference, resulting in the separation between the shell and the heat exchanger core, and even the shell being torn apart by the large pressure difference.

[0005] In addition, the existing fresh air heat exchangers allow a certain amount of leakage. Under the condition of allowance control, the materials of the heat exchanger shell and the connection methods of the component parts usually adopt forms such as pin connection, simple caulking, and hemming, and the airtightness is general. For a pressurized building, because the pressure inside the heat exchanger shell is much greater than the outside pressure, high airtightness requirements are put forward for the heat exchanger. The whole fresh air heat exchanger does not undergo obvious leakage under 50 Kpa. The conventional sealing means of the existing heat exchangers completely fail, resulting in huge air leakage.

[0006] Therefore, it is necessary to improve the existing technology. Summary of the Invention

[0007] The purpose of the utility model is to provide a heat exchanger aiming at the deficiencies of the existing technology, aiming to improve the strength of the heat exchanger.

[0008] The technical solution adopted by the utility model is: a heat exchanger, comprising an external frame body and a heat exchange core body arranged inside the external frame body;

[0009] The external frame body includes a square main frame, an installation frame arranged inside the main frame, a mask fixed to the circumference of the main frame, and cover plates arranged at the top and bottom of the main frame;

[0010] On two opposite mask plates, a fresh air outlet, an exhaust air inlet, an exhaust air outlet and a fresh air inlet are respectively arranged.

[0011] The heat exchange core is installed in the installation frame; a fresh air channel communicating with the fresh air inlet and the fresh air outlet is arranged in the heat exchange core; an exhaust air channel communicating with the exhaust air outlet and the exhaust air inlet is arranged in the heat exchange core.

[0012] According to the above scheme, the four corners of the installation frame are respectively fixedly connected to the middle part of the main frame, and four areas respectively corresponding to and communicating with the fresh air outlet, the exhaust air inlet, the exhaust air outlet and the fresh air inlet are formed between the outer side of the installation frame and the inner side of the main frame; two diagonally opposite areas are located at both ends of the fresh air channel of the heat exchange core and are both communicated with the fresh air channel, serving as fresh air areas; the other two diagonally opposite areas are located at both ends of the exhaust air channel of the heat exchange core and are both communicated with the exhaust air channel, serving as exhaust air areas.

[0013] According to the above scheme, the heat exchange core includes heat exchange blocks and a core frame for fixing the heat exchange blocks; the heat exchange blocks include a plurality of square first heat exchange fins and second heat exchange fins; the first heat exchange fins and the second heat exchange fins are alternately stacked up and down, and a gap is left between adjacent two heat exchange fins to form an air flow channel serving as a fresh air channel or an exhaust air channel, the fresh air channels and the exhaust channels are alternately arranged at intervals, the two ends of the fresh air channel located in the exhaust air area are closed, and the two ends of the exhaust channel located in the fresh air area are closed.

[0014] According to the above scheme, both the first heat exchange fins and the second heat exchange fins are arranged with staggered upward-arching structures and downward-concave structures, and the upward-arching positions of the first heat exchange fins correspond to the downward-concave structure positions of the second heat exchange fins.

[0015] According to the above scheme, a limiting protrusion is arranged at the top of the upward-arching structure, a limiting groove is arranged at the bottom of the downward-concave structure, and the limiting protrusion is adapted to the limiting groove; between adjacent two heat exchange fins, the limiting protrusion of the upward-arching structure of the next heat exchange fin is clamped into the limiting groove of the downward-concave structure of the previous heat exchange fin.

[0016] According to the above scheme, the main frame includes four side frames sequentially connected circumferentially, each side frame includes two upper and lower parallel main beams and a plurality of secondary beams connecting the two main beams; the main beams of adjacent two side frames are connected by the secondary beams at the ends; square tubes are arranged in the middle of the two main beams of each side frame.

[0017] According to the above scheme, the installation frame includes four frame units respectively arranged on four sides, each frame unit includes two upper and lower main rods, a secondary rod arranged in the middle for connecting the two main rods, and a clamping plate arranged at the end for connecting the two main rods, and one side of the clamping plate is connected to the middle part of the main frame; each main rod is connected to the corner of the corresponding side of the main frame through a connecting rod.

[0018] According to the above solution, the edges of the first heat exchange fin and the second heat exchange fin at the closed end of the air flow channel are bent and welded to form a welded edge.

[0019] According to the above solution, the core frame includes pressing plates arranged at the top and bottom of the heat exchange block, and pressing strips for fixing the four corners of the heat exchange block; the heat exchange fins located at the top and bottom are respectively in contact with the pressing plates.

[0020] According to the above solution, the corners of each heat exchange fin correspond to the shape of the pressing strip, and a structural sealant is filled in the gap between the heat exchange fin and the pressing strip.

[0021] The beneficial effects of the present utility model are as follows:

[0022] 1. The main frame of the external frame of the heat exchanger of the present utility model supports the cover plate, and an installation frame is designed inside the main frame for installing the heat exchange core. The main frame is fixedly connected to the installation frame, and the installation frame is fixedly connected to the heat exchange core, greatly improving the overall strength of the heat exchanger, and the structure of the heat exchanger is simple;

[0023] 2. In the present utility model, the components between the main frame and the installation frame are welded, the heat exchange core is clamped in the installation frame, and the cover plate is bolted to the heat exchange core, which is convenient for disassembly and assembly; the core frame of the heat exchange core is designed to strengthen the structure and improve the strength of the heat exchange core.

[0024] 3. In the present utility model, the heat exchange core is designed based on the principle of a cross-flow plate type sensible heat exchanger, and the fresh air channel and the exhaust air channel inside it cross and are arranged at intervals up and down, improving the heat exchange efficiency between the fresh air and the exhaust air.

[0025] 4. In the present utility model, the cooperation design of the upward arch structure and the downward concave structure, the limit protrusions and the limit grooves on the heat exchange fins further enhances the anti-deformation ability while increasing the heat exchange area.

[0026] 5. In the present utility model, the sealing design between the external frame and the heat exchange core and inside the heat exchange core effectively ensures the overall sealing performance of the heat exchanger. Description of the Drawings

[0027] Figure 1 It is an overall schematic diagram of a specific embodiment of the present utility model.

[0028] Figure 2 It is an internal structure schematic diagram of this embodiment.

[0029] Figure 3 It is a cross-sectional schematic diagram of the heat exchange core in this embodiment.

[0030] Figure 4 It is a structural schematic diagram of the installation frame in this embodiment.

[0031] Figure 5 Schematic diagram of the connection between the outer frame and the installation frame in this embodiment.

[0032] Figure 6 Overall schematic diagram of the heat exchange core in this embodiment.

[0033] Figure 7 Overall structural schematic diagram of the heat exchange block in this embodiment.

[0034] Figure 8 Schematic diagram of the corner of the heat exchange block in this embodiment.

[0035] Figure 9 Schematic diagram of the structures of the first heat exchange fin and the second heat exchange fin in this embodiment.

[0036] Wherein: 1. Outer frame; 11. Fresh air outlet; 12. Exhaust air inlet; 13. Exhaust air outlet; 14. Fresh air inlet; 15. Main body frame; 150. Main beam; 151. Link rod; 152. Secondary beam; 153. Square tube; 154. Clamping plate; 155. Main rod; 156. Secondary rod; 16. Cover plate; 2. Heat exchange core; 21. Heat exchange block; 211. First heat exchange fin; 212. Second heat exchange fin; 213. Welded edge; 214. Gap between the corner and the pressing strip; 215. Upper arch structure; 216. Lower concave structure; 217. Limit projection; 218. Limit groove; 219. Air flow channel; 22. Core frame; 221. Pressing plate; 222. Pressing strip; 223. Screw hole; 24. Reinforcing rib; 3. Sealing strip; 4. Cover plate; 5. Rubber washer; 6. Screw; 7. Bolt. Detailed implementation manner

[0037] To better understand the present utility model, the present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0038] As Figure 1 and Figure 2 shown, a heat exchanger, specifically a fresh air heat exchanger for boosting a building fresh air system, includes an outer frame 1 and a heat exchange core 2 disposed inside the outer frame 1;

[0039] The outer frame 1 includes a square main body frame 15, an installation frame disposed inside the main body frame 15, a cover plate 16 fixed to the circumference of the main body frame 15, and cover plates disposed at the top and bottom of the main body frame 15; fresh air outlets 11, exhaust air inlets 12, exhaust air outlets 13, and fresh air inlets 14 are respectively provided on two opposite cover plates 16;

[0040] The heat exchange core 2 is installed within the installation frame; a fresh air passage communicating with the fresh air inlet 12 and the fresh air outlet 11 is provided inside the heat exchange core 2; an exhaust air passage communicating with the exhaust air outlet 13 and the exhaust air inlet 12 is provided inside the heat exchange core 2, and the fresh air passage and the exhaust air passage are arranged in a cross pattern.

[0041] In the present utility model, the main body frame 15 includes four side frames that are sequentially circumferentially enclosed and connected. Each side frame includes two main beams 150 that are parallel up and down and several secondary beams 152 that connect the two main beams 150; the main beams 150 of adjacent two side frames are connected by the secondary beams 152 at the ends; square tubes 153 (which can be used to connect the upper and lower main beams 150) are arranged in the middle of the two main beams 150 of each side frame; the main beams 150 are angle steels, and the secondary beams 152 are tension plates.

[0042] In this embodiment, the main body frame 15 is connected (which can be welding) using square tubes 153, angle steels, and tension plates, and the overall strength of the main body frame 15 is high.

[0043] Preferably, as Figure 1 and Figure 4 shown, a square installation frame is fixed inside the main body frame 15. The heat exchange core 2 has a square structure adapted to the installation frame, and the heat exchange core 2 is arranged within the installation frame (which can be snap-connected, as Figure 3 shown); the four corners of the installation frame are respectively connected and fixed to the middle parts of the four side frames of the main body frame 15 (specifically connected to the four square tubes 153 in the middle of each side frame). Four regions respectively corresponding to and communicating with the fresh air outlet 11, the exhaust air inlet 12, the exhaust air outlet 13, and the fresh air inlet 14 are formed between the outer side of the installation frame and the inner side of the main body frame 15 (that is, the fresh air outlet 11, the exhaust air inlet 12, the exhaust air outlet 13, and the fresh air inlet 14 are respectively provided on the blind plates 16 at the corresponding positions of these four regions); two diagonally opposite regions are located at both ends of the fresh air passage of the heat exchange core 2 and are both communicated with the fresh air passage, and these two regions are fresh air regions; the other two diagonally opposite regions are located at both ends of the exhaust air passage of the heat exchange core 2 and are both communicated with the exhaust air passage, and these two regions are exhaust air regions.

[0044] In the present utility model, outdoor fresh air enters the corresponding fresh air region of the main body frame 15 through the fresh air inlet 14 and then enters the heat exchange core 2. The exhaust air discharged indoors enters the corresponding exhaust air region through the exhaust air inlet 12 and then enters the heat exchange core 2; the outdoor fresh air exchanges heat with the outdoor exhaust air within the heat exchange core 2, and the fresh air enters the room through the fresh air outlet 11, and the exhaust air is discharged through the exhaust air outlet 13.

[0045] In the present utility model, the fresh air and the exhaust air flow in an "X" direction within the heat exchange core 2, and through the cross-flow heat exchange effect, the heat exchange between the indoor exhaust air and the outdoor fresh air is realized.

[0046] In the present utility model, the mounting frame includes four frame units respectively arranged on four sides. Each frame unit includes two main rods 155 arranged vertically and horizontally, a secondary rod 156 arranged in the middle for connecting the two main rods 155, and a clamping plate 154 arranged at the end for connecting the two main rods 155. One side of the clamping plate 154 is connected to the middle of each side frame of the main body frame 15 (specifically connected to the square tube 153 in the middle of each side frame); each main rod 155 is connected to the corner of the corresponding side of the main body frame 15 through a connecting rod 151. The main rods 155 and the connecting rods 151 are both angle steels, and the secondary rod 156 is a tension plate.

[0047] Preferably, as Figure 5 shown, the heat exchange core 2 includes heat exchange blocks 21 and a core frame 22 for fixing the heat exchange blocks 21; as Figures 6 - 8 shown, the heat exchange blocks 21 include a plurality of square first heat exchange fins 211 and second heat exchange fins 212; the first heat exchange fins 211 and the second heat exchange fins 212 are stacked alternately up and down, and there is a gap between adjacent heat exchange fins, forming an air flow channel 219 serving as a fresh air channel or an exhaust air channel. The fresh air channels and the exhaust air channels are arranged alternately at intervals. The two ends of the fresh air channels located in the exhaust air area are closed (the corresponding edges of the heat exchange plates are bent and welded to form welding edges 213), and the two ends of the exhaust air channels located in the fresh air area are closed (the corresponding edges of the heat exchange plates are bent and welded to form welding edges 213).

[0048] In the present utility model, a plurality of air flow channels 219 are formed in the heat exchange blocks 21. These air flow channels 219 are alternately divided into two groups at intervals. One group serves as a fresh air channel, and the other group serves as an exhaust air channel. The fresh air channels and the exhaust air channels are arranged alternately up and down; the fresh air channels are only communicated with the fresh air area and not with the exhaust air area; the exhaust air channels are only communicated with the exhaust air area and not with the fresh air area.

[0049] Preferably, the first heat exchange fins 211 and the second heat exchange fins 212 are both provided with staggered upward arch structures 215 and downward concave structures 216. The position of the upward arch structure 215 of the first heat exchange fin 211 corresponds to the position of the downward concave structure 216 of the second heat exchange fin 212; wherein, a limiting protrusion 217 (spherical) is provided at the top of the upward arch structure 215, and a limiting groove 218 is provided at the bottom of the downward concave structure 216. The limiting protrusion 217 and the limiting groove 218 are adapted to each other; between adjacent heat exchange fins, the limiting protrusion 217 of the upward arch structure 215 of the next heat exchange fin is snapped into the limiting groove 218 of the downward concave structure 216 of the previous heat exchange fin to realize the position locking between adjacent heat exchange fins; the upward arch structure 215 of the first heat exchange fin 211 and the downward concave structure 216 of the second heat exchange fin 212 are in contact with each other, propping up the two heat exchange fins, so that a gap is formed between the two heat exchange fins, constituting the air flow channel 219.

[0050] In this embodiment, both the first heat exchange fin 211 and the second heat exchange fin 212 are provided with an upper arch structure 215 and a lower concave structure 216 arranged in an alternating manner, and they have good pressure-bearing performance; an air flow channel 219 is formed between the first heat exchange fin 211 and the second heat exchange fin 212, and the height of the air flow channel 219 can be adjusted according to actual conditions; at the same time, the upper arch structure 215 and the lower concave structure 216 are in contact, which is beneficial to the overall support of the heat exchange fins and prevents the heat exchange fins from deforming under high-pressure air flow. The limiting protrusion 217 and the limiting groove 218 cooperate to prevent the first heat exchange fin 211 and the second heat exchange fin 212 from moving horizontally, further enhancing the anti-deformation ability of the heat exchange fins. The edges of the first heat exchange fin 211 and the second heat exchange fin 212 at the closed end of the air flow channel (which can be an exhaust air channel or a fresh air channel) are bent at a small angle and welded to form a welded edge 213, so that the edges of this layer of air flow channel are sealed, and the bending directions are opposite for different air flow directions, forming an alternatingly separated fresh air channel and exhaust air channel.

[0051] Preferably, the core frame 22 includes pressing plates 221 provided at the top and bottom of the heat exchange block 21, and pressing strips 222 fixing the four corners of the heat exchange block 21; the heat exchange fins located at the top and bottom are respectively in contact with the pressing plates 221, the corners of each heat exchange fin correspond to the shape of the pressing strips 222, and structural sealant is filled in the gap 214 between the heat exchange fin and the pressing strip 222 to ensure the sealing effect.

[0052] The utility model is based on the working principle of a plate type sensible heat exchanger, and adopts a form combining an internal heat exchange core 2 and an external high-strength frame. The structure is simple and the maintenance is convenient. Under high-pressure gas conditions, the heat exchanger also has good structural stability and airtightness, and the comprehensive heat exchange effect is good.

[0053] Embodiment

[0054] In this embodiment, the overall structure of the heat exchanger is square and has a relatively low height. It mainly includes an external frame 1 and an internal heat exchange core 2. Among them, the installation frame and the main frame 15 inside the external frame 1 are used to fix the heat exchange core 2, separate the air flow channels 219, and connect to external pipes (each air inlet and exhaust outlet), and the heat exchange core 2 is the part where the cold and hot gases exchange heat. The main frame 15 is provided with a fresh air outlet 11, an exhaust air inlet 12, an exhaust air outlet 13, and a fresh air inlet 14 on both sides. The above-mentioned air inlets and outlets are connected to the corresponding pipes; the exhaust air and the fresh air flow in an "X" shape inside the heat exchanger, and through the cross-flow heat exchange effect, the heat exchange between the indoor exhaust air and the outdoor fresh air is realized.

[0055] Such as Figure 2 、 Figure 3As shown in the figure, when the heat exchange core 2 is installed, it is clamped to the installation frame through the clamping plates 154 on both sides, and circumferentially connected and fixed with bolts 7. Along the installation direction of the heat exchange core 2, sealing rubber strips 3 and cover plates are provided on both the upper surface and the lower surface of the heat exchange core 2. Screw holes are prefabricated on the sealing rubber strips 3 and the cover plates, which correspond one by one to the screw holes prefabricated on the main body frame 151 and the heat exchange core 22. The above components are fixedly connected through rubber washers 5 and screws 6 to ensure the overall structural strength, airtightness and the convenience of later disassembly and maintenance. The cover plate is made of 2mm stainless steel plate, which has high tensile performance and strong corrosion resistance. The sealing rubber strips 3 are continuously and evenly arranged along the screw installation positions around the heat exchange core 2 and the main body frame 15, which not only ensures the airtightness of the whole heat exchanger, but also avoids the mixing of fresh air and exhaust air inside the heat exchanger and reduces the heat exchange effect.

[0056] As Figure 4 shown in the figure, the components of the main body frame 151, such as angle steel, tension plates, square tubes 153 and clamping plates 154, are welded and connected, and all are made of stainless steel materials. The overall weight is light, the structural stiffness is large, and it is not easy to deform, meeting the requirements of the air supply and exhaust pressure of the fresh air system. The cover plate 16 is made of stainless steel plate and is fixedly connected to the main body frame 15. Circular ventilation holes are provided on both sides. The fresh air outlet 11, the exhaust air inlet 12, the exhaust air outlet 13 and the fresh air inlet 14 are welded and fixed to the ventilation holes prefabricated on the cover plate 16 with stainless steel round tubes, and pipe thread interfaces are reserved at the ends for connection to the ventilation ducts.

[0057] As Figure 5 shown in the figure, the heat exchange core 2 includes heat exchange blocks 21 and a core frame 22. The core frame 22 mainly includes two upper and lower pressing plates 221 and four pressing bars 222. The pressing bars 222 are stainless steel plates bent at 90°, located at the four corners of the heat exchange blocks 21, and their function is to fix the heat exchange fins to prevent the heat exchange fins from moving horizontally. The pressing plates 221 are made of stainless steel plates, which are used to press the heat exchange fins. The four sides are bent into a C shape, and screw holes for installing bolts 7 are prefabricated. In addition, screw holes 223 are provided at the four corners of the pressing plates 221, and they are connected to the pressing bars 222 through screws to form the overall core frame 22. The reinforcing ribs are cross-fixed on the pressing plates 221 to improve the overall stiffness of the pressing plates 221 and prevent the pressing plates 221 from deforming greatly under high-pressure gas.

[0058] The utility model relates to a heat exchanger with characteristics such as high strength, high airtightness, stable and efficient performance, and convenient maintenance, which can be applied to the fresh air system of a pressurized building. This embodiment is used for the fresh air system of a pressurized building, and its working principle is as follows: When fresh air needs to be replaced, the intake fan and exhaust valve of the fresh air system are simultaneously opened. The exhaust air in the room and the fresh air outside cross-flow into the heat exchanger through the corresponding intake ports. In the heat exchange core 2, the exhaust air and fresh air are alternately and overlapped and separated by the heat exchange fins. With the help of the good heat conductivity of the stainless steel heat exchange plates, efficient heat transfer between the exhaust air and fresh air is achieved. After the heat transfer is completed, the fresh air enters the room through the air outlet of the heat exchanger, and the exhaust air is discharged outside the room.

[0059] In the utility model, both the main frame 15 and the core are made of high-strength and corrosion-resistant stainless steel materials. Structurally, a plurality of square tubes 153, angle steels, tension plates and reinforcing ribs are arranged at the easily deformed parts, ensuring the overall strength. In addition, the combined design of the upward arch structure 215 and downward concave structure 216, the limit protrusion 217 and limit groove 218 between the heat exchange fins not only increases the heat exchange area but also further enhances the anti-deformation ability, effectively preventing the heat exchanger from being significantly deformed under the impact of high-pressure gas; The main frame 15 and the cover plate 4, the core frame and the core, and many parts inside the core are sealed with sealing rubber strips or sealants. At the same time, the edges of the heat exchange fins are bent and welded, ensuring that the heat exchanger will not have problems such as air leakage and air mixing under high-pressure gas conditions, meeting the airtightness requirements; The edges of the heat exchange fins are bent and welded to isolate the fresh air and exhaust air channels, avoiding air mixing; The heat exchange core 2 and the installation frame are connected by snap connection and detachable bolts, the main frame 15 and the cover plate are connected by detachable screws, and the heat exchanger and the ventilation duct are connected by pipe threads, making the later disassembly and maintenance more convenient.

[0060] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0061] Finally, it should be noted that the above are only the preferred embodiments of the utility model and are not used to limit the utility model. Although the utility model has been described in detail with reference to the embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A heat exchanger, characterized in that, It includes an outer casing and a heat exchange core body disposed inside the outer casing; The outer casing includes a main body frame, an installation frame disposed inside the main body frame, a mask fixed to the circumferential direction of the main body frame, and cover plates disposed at the top and bottom of the main body frame; A fresh air outlet, an exhaust air inlet, an exhaust air outlet, and a fresh air inlet are respectively provided on two opposite masks; The heat exchange core body is installed in the installation frame; a fresh air channel communicating with the fresh air inlet and the fresh air outlet is provided in the heat exchange core body; an exhaust air channel communicating with the exhaust air outlet and the exhaust air inlet is provided in the heat exchange core body.

2. The heat exchanger according to claim 1, wherein The four corners of the installation frame are respectively connected and fixed to the middle of the main body frame, and four regions respectively corresponding to and communicating with the fresh air outlet, the exhaust air inlet, the exhaust air outlet, and the fresh air inlet are formed between the outer side of the installation frame and the inner side of the main body frame; two of the diagonally opposite regions are located at both ends of the fresh air channel of the heat exchange core body and are both communicated with the fresh air channel, serving as fresh air regions; the other two diagonally opposite regions are located at both ends of the exhaust air channel of the heat exchange core body and are both communicated with the exhaust air channel, serving as exhaust air regions; the fresh air channel and the exhaust air channel are arranged in a cross pattern.

3. The heat exchanger according to claim 1, wherein, The heat exchange core body includes heat exchange blocks and a core body frame for fixing the heat exchange blocks; the heat exchange blocks include a number of square first heat exchange fins and second heat exchange fins; the first heat exchange fins and the second heat exchange fins are alternately stacked up and down, and a gap is left between adjacent two heat exchange fins to form an air flow channel serving as a fresh air channel or an exhaust air channel, the fresh air channels and the exhaust channels are alternately arranged at intervals, the two ends of the fresh air channel located in the exhaust air region are closed, and the two ends of the exhaust channel located in the fresh air region are closed.

4. The heat exchanger according to claim 3, characterized in that, Both the first heat exchange fins and the second heat exchange fins are arranged with staggered upward arch structures and downward concave structures, and the upward arch position of the first heat exchange fin corresponds to the downward concave structure position of the second heat exchange fin.

5. The heat exchanger according to claim 4, characterized in that, A limiting protrusion is provided at the top of the upward arch structure, and a limiting groove is provided at the bottom of the downward concave structure, and the limiting protrusion and the limiting groove are adapted to each other; between adjacent two heat exchange fins, the limiting protrusion of the upward arch structure of the next heat exchange fin is snapped into the limiting groove of the downward concave structure of the previous heat exchange fin.

6. The heat exchanger according to claim 1, characterized in that, The main body frame includes four side frames sequentially connected circumferentially, each side frame includes two main beams parallel up and down and a number of secondary beams connecting the two main beams; the main beams of adjacent two side frames are connected by the secondary beams at the ends; square tubes are provided in the middle of the two main beams of each side frame.

7. The heat exchanger according to claim 1, wherein, The installation frame includes four frame units respectively disposed on four sides, each frame unit includes two main rods up and down, a secondary rod disposed in the middle for connecting the two main rods, and a clamping plate disposed at the end for connecting the two main rods, and one side of the clamping plate is connected to the middle of the main body frame; each main rod is connected to the corner of the corresponding side of the main body frame through a connecting rod.

8. The heat exchanger according to claim 3, characterized in that, The edges of the first heat exchange fins and the second heat exchange fins at the closed end of the air flow channel are bent and welded to form welding edges.

9. The heat exchanger according to claim 3, wherein, The core body frame includes pressing plates disposed at the top and bottom of the heat exchange blocks, and pressing strips for fixing the four corners of the heat exchange blocks; the heat exchange fins located at the top and bottom respectively contact the pressing plates.

10. The heat exchanger according to claim 9, characterized in that, The corners of each heat exchange fin correspond to the shape of the pressing strip, and a structural sealant is filled in the gap between the heat exchange fin and the pressing strip.

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