Condensation heat recovery air conditioning unit

Abstract

The present application relates to the field of air conditioning technology and discloses a condensing heat recovery air conditioning unit, including a refrigeration unit, a condenser, and a plate heat exchanger; a drainage channel 1 including: a straight drainage channel, one end of which faces the corrugated area and the other end faces the end edge of the metal heat exchange sheet; a bend drainage channel, one end of which is connected to the straight drainage channel and the other end is connected to the straight drainage channel; a second bend drainage channel, one end of which is connected to the middle connecting point between the first bend drainage channel and the straight drainage channel and the other end is connected to the water outlet end of the straight drainage channel; a water outlet branch channel formed between the curved section of the second bend drainage channel and the end edge of the corrugated area; a water source channel is connected between the drainage channel 1 and the water hole. The present application realizes that water flows into the metal sheet in an orderly manner and slows down the water flow speed, thereby increasing the effective heat exchange area of the metal sheet and improving the heat recovery efficiency of the condensing heat recovery air conditioning unit.

Description

Technical Field

[0001] The present application relates to the field of air conditioning technology, and in particular to a condensing heat recovery air conditioning unit. Background Art

[0002] During the operation of the air-conditioning system, the refrigerant changes from gas to liquid in the condenser, releasing a large amount of heat. This heat is usually discharged into the environment through a cooling tower or other means, resulting in energy waste. A condenser heat recovery unit is installed in the air-conditioning unit to recover the condensation heat and convert it into usable thermal energy for heating domestic hot water or other media that need to be heated, thereby realizing the secondary utilization of energy and achieving the goals of energy saving and environmental protection.

[0003] The condenser heat recovery unit uses the hot water discharged from the condenser side of a conventional air-conditioning chiller to achieve heat recovery through indirect heat exchange through a plate heat exchanger. The plate heat exchanger is a plate heat exchanger. The cold water supplied by the cooling tower enters the plate heat exchanger. The hot water discharged from the condenser side of the air-conditioning chiller exchanges heat with the cold water supplied by the cooling tower in the plate heat exchanger, causing the cold water to absorb heat and increase in temperature. Eventually, the hot water can be used for domestic hot water.

[0004] However, in the process of implementing relevant technical solutions, it was found that at least the following technical problems exist: the metal plates in the current plate heat exchangers use corrugated plates with herringbone grooves to slow down the flow rate of water on the surface of the metal plates, thereby extending the heat exchange time between hot and cold water on both sides of the metal plates and improving the heat exchange effect. These herringbone grooves occupy most of the area of the metal plates. The existing metal plates do not have guide grooves to guide the water flow so that the water flows evenly to the herringbone grooves. Once the guide grooves are set, they will inevitably occupy the occupancy rate of the herringbone grooves on the metal plates, which will reduce the heat exchange efficiency of the metal plates. As a result, the flow of water on the metal plates is disordered, resulting in no water flow passing through part of the area of the metal plates. The effective heat exchange area of the metal plates needs to be increased, resulting in low heat recovery efficiency of the condensing heat recovery air-conditioning unit. Summary of the Invention

[0005] The present application solves the technical problem in the prior art that the flow of water on the metal sheet is disordered and the effective heat exchange area of the metal sheet needs to be improved by providing a condensing heat recovery air-conditioning unit. The application realizes that the guide groove can not only guide the water flow into the metal sheet in an orderly manner but also slow down the water flow speed, further extending the heat exchange time between the hot and cold water on both sides of the metal sheet. The effective heat exchange area of the metal sheet is improved, and the heat recovery efficiency of the condensing heat recovery air-conditioning unit is also improved.

[0006] The present application provides a condensing heat recovery air-conditioning unit, including a refrigeration unit, a condenser and a plate heat exchanger, wherein the plate heat exchanger includes end plates at both ends, several metal heat exchange thin plates, and sealing gaskets, and water holes are opened at the four corners of the metal heat exchange thin plates, and several herringbone channels are punched on the metal heat exchange thin plates, and the several herringbone channels form a corrugated area on the metal heat exchange thin plates, and diffuser areas are formed between the end edges of the corrugated area and the end edges of the metal heat exchange thin plates; wherein, with the center line of the metal heat exchange thin plates in the length direction as the symmetry line, drainage channels 1 are symmetrically punched on both sides of the diffuser area; the drainage channel 1 includes: a straight drainage channel, one end of which faces the corrugated area, and the other end faces the The end edge of the metal heat exchange plate; a bend drainage channel, located on one side of the straight drainage channel, one end of the bend drainage channel is connected to the water inlet end of the straight drainage channel, and the other end is connected to the middle of the straight drainage channel; two bend drainage channels, on the same side of the one bend drainage channel, one end of the two bend drainage channels is connected to the connecting point between the one bend drainage channel and the middle of the straight drainage channel, and the other end is connected to the water outlet end of the straight drainage channel; a plurality of outlet branch channels are provided, formed between the curved section of the two bend drainage channels and the end edge of the corrugated area; a water source channel is connected between the water inlet end of the drainage channel one and the water hole on the same side, and the close ends of the water source channels on both sides of the diffuse flow area are connected to each other.

[0007] Furthermore, a drainage channel 2 is stamped on one side of the drainage channel 1 close to the center line in the length direction of the metal heat exchange plate. The structure of the drainage channel 2 is consistent with that of the drainage channel 1. The intersections of the drainage channel 1, the water source channel, and the drainage channel 2 on both sides of the center line in the length direction of the metal heat exchange plate are connected to each other.

[0008] Furthermore, the edge lines on both sides of the corrugated area are parallel to the edge lines on both sides of the metal heat exchange plate. The edge lines at both ends of the corrugated area are herringbone-shaped, and the tips are facing the center direction of the metal heat exchange plate. The multiple outlet branches in the drainage channel 1 and the drainage channel 2 are distributed in sequence along the length direction of the end edge of the corrugated area.

[0009] Furthermore, the outer ring of each water hole in the metal heat exchange plate is punched with an embedding groove, and an embedding groove 1 is punched between the water hole and the curved section of the drainage channel 1; the sealing gasket includes: a sealing edge, which surrounds the edge of the metal heat exchange plate; two sealing rings are provided, which are respectively embedded in the embedding grooves on the same side of the two ends of the metal heat exchange plate, and the sealing ring and the sealing edge are formed as one piece; a return-bend sealing strip, which is embedded in the return-bend drainage channel; a sealing strip 1, which is embedded in the embedding groove 1, and the sealing strip 1 is connected between the return-bend sealing strip and the sealing ring; a sealing strip 2, which is embedded in the water source channel, and one end of the sealing strip 2 is connected to the sealing ring, and the other end is connected to the return-bend sealing strip.

[0010] Furthermore, a second embedding groove is punched between the first embedding groove and the water outlet branch channel closest to the edge of the metal heat exchange plate, a third embedding groove is punched between the second embedding groove and the side edge of the metal heat exchange plate, and a fourth embedding groove is punched between the water source channel and the end edge of the metal heat exchange plate; the sealing gasket also includes: a sealing strip three, embedded in the second embedding groove, and the sealing strip three is connected to the first sealing strip; a sealing strip four, embedded in the third embedding groove, one end of the sealing strip four is connected to the third sealing strip, and the other end is connected to the sealing surrounding edge; a sealing strip five, embedded in the fourth embedding groove, one end of the sealing strip five is connected to the second sealing strip, and the other end is connected to the sealing surrounding edge; the sealing ring is located within the encirclement of the fourth sealing strip, the third sealing strip, the first sealing strip, the return sealing strip, the second sealing strip, the fifth sealing strip and the sealing surrounding edge.

[0011] Furthermore, the end of the embedding groove away from the end edge of the metal heat exchange plate is connected to the end of the water source channel away from the water hole.

[0012] Furthermore, the arc length of the second-bend drainage channel at the bend is smaller than the arc length of the first-bend drainage channel at the bend.

[0013] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0014] Due to the use of a metal heat exchange plate stamped with a first diversion channel and a second diversion channel, the water flow entering the diffuser area can be slowed down, the residence time of the water flow on the metal heat exchange plate is prolonged, and the heat exchange efficiency is improved. In addition, the use of a first bend diversion channel and a second bend diversion channel can also make the water flow orderly diverted and dispersed in the diffuser area, so that heat exchange can be carried out at various positions in the diffuser area, and the area of the corrugated area occupied by the diffuser area is not wasted, and the water flow can enter the corrugated area in an orderly manner along the routes of various channels. Therefore, heat exchange can be fully carried out at various positions in the corrugated area of the metal heat exchange plate, so that the effective heat exchange area of the metal heat exchange plate is improved, and the heat recovery efficiency of the condensing heat recovery air-conditioning unit is also improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It mainly illustrates the circuit diagram of the plate heat exchanger in the condensing heat recovery air-conditioning unit in the embodiment of the present application;

[0016] Figure 2 This is an overall schematic diagram of a plate heat exchanger in an embodiment of the present application;

[0017] Figure 3 This is a front view of the metal heat exchange plate and the sealing gasket in the assembled state according to the embodiment of the present application;

[0018] Figure 4 for Figure 3 Front view of the metal heat exchange plate;

[0019] Figure 5 for Figure 4 Schematic diagram of the middle part structure;

[0020] Figure 6 for Figure 5 Schematic diagram of the middle diversion canal 1;

[0021] Figure 7 for Figure 3 Front view of the middle sealing gasket;

[0022] In the figure: 100, plate heat exchanger; 1, end plate; 2, metal heat exchange plate; 201, corrugated area; 202, diffuser area; 21, water hole; 22, herringbone channel; 23, diversion channel 1; 231, straight diversion channel; 232, first bend diversion channel; 233, second bend diversion channel; 234, outlet branch channel; 24, water source channel; 25, diversion channel 2; 26, embedded ring groove; 27, embedded groove 1; 28, embedded groove 2; 29, embedded groove 3; 210, embedded groove 4; 3, sealing gasket; 31, sealing edge; 32, sealing ring; 33, bend sealing strip; 34, sealing strip 1; 35, sealing strip 2; 36, sealing strip 3; 37, sealing strip 4; 38, sealing strip 5. DETAILED DESCRIPTION

[0023] In order to better understand the technical solution of the present application, the technical solution of the present application will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0024] Reference Figure 1 A condensation heat recovery air-conditioning unit includes a refrigeration unit, a condenser and a plate heat exchanger 100. During the refrigeration process of the refrigeration unit, a large amount of heat will be discharged from the condenser side. This part of the heat will enter the plate heat exchanger 100. The cold water entering the plate heat exchanger 100 from the cooling tower will exchange heat with the heat discharged from the condenser side, so that the cold water will be heated up, thereby producing a temperature suitable for domestic water.

[0025] Reference Figure 2 and Figure 3 The plate heat exchanger 100 includes an end plate 1, a metal heat exchange plate 2, and a sealing gasket 3. The end plate 1 is provided with two pieces, and the two end plates 1 are arranged vertically and parallel to each other. The metal heat exchange plate 2 is provided with a plurality of pieces, and the plurality of metal heat exchange plates 2 are clamped between the two end plates 1. The edge of one side of each metal heat exchange plate 2 is attached with a sealing gasket 3. The sealing gasket 3 allows a gap to be provided between the two metal heat exchange plates 2 to allow water to flow on the surface of the metal heat exchange plate 2, and hot water and cold water are respectively introduced into the two sides of the metal heat exchange plate 2, and the metal heat exchange plate 2 is used as the heat exchange medium to exchange heat between hot water and cold water.

[0026] Reference Figure 4 and Figure 5The metal heat exchange plate 2 is in the shape of a long strip, and water holes 21 are opened at the four corners of the metal heat exchange plate 2. Several herringbone channels 22 are punched on the metal heat exchange plate 2. The tips of the herringbone channels 22 are located on the center line of the metal heat exchange plate 2 in the length direction. Several herringbone channels 22 form a corrugated area 201 on the metal heat exchange plate 2. The edge lines on both sides of the corrugated area 201 are parallel to the edge lines on both sides of the metal heat exchange plate 2. There is a gap between the edge lines of the corrugated area 201 in the length direction and the edge lines of the metal heat exchange plate 2 in the length direction, and the gap is used to place the sealing gasket 3. The edge lines at both ends of the corrugated area 201 are herringbone-shaped, and the tips of the herringbone edge lines are located on the center line of the metal heat exchange plate 2 in the length direction, and the tips of the edge lines at both ends of the corrugated area 201 are facing the center of the metal heat exchange plate 2. A diffusion area 202 is formed between the end edge of the corrugated area 201 and the end edge of the metal heat exchange plate 2. The water hole 21 is located in the diffusion area 202. The center line of the metal heat exchange plate 2 in the longitudinal direction is used as the symmetry line. Drainage channel 1 23 and drainage channel 2 25 are symmetrically stamped on both sides of the diffusion area 202. The shapes of drainage channel 1 23 and drainage channel 2 25 are the same, and drainage channel 2 25 is a proportional reduction of drainage channel 1 23. Drainage channel 2 25 is closer to the center line of the metal heat exchange plate 2 in the longitudinal direction. Drainage channel 1 23 is located on the side of drainage channel 2 25 that is away from the center line of the metal heat exchange plate 2 in the longitudinal direction.

[0027] Reference Figure 5 and Figure 6The drainage channel 23 includes a straight drainage channel 231, a first-bend drainage channel 232, a second-bend drainage channel 233, and an outlet branch channel 234 that are interconnected. The straight drainage channel 231 is a straight drainage channel, wherein the straight drainage channel 231 in the drainage channel 1 23 is stamped into an inclined shape on the metal heat exchange sheet 2, with one end facing the end edge of the corrugated area 201 and the other end facing the middle position between the water holes 21 on both sides, and the end of the drainage channel 1 23 facing the middle position between the water holes 21 on both sides is the water inlet end, and the other end is the water outlet end, and the straight drainage channel 231 in the drainage channel 2 25 is stamped into a vertical shape on the metal heat exchange sheet 2 and close to the center line of the metal heat exchange sheet 2 in the length direction; a bend drainage channel 232 is located on the side of the straight drainage channel 231 away from the center line of the metal heat exchange sheet 2 in the length direction, and one end of the bend drainage channel 232 is aligned with the straight drainage channel 23 1 is connected with the water inlet end, and the other end is connected with the middle part of the straight drainage channel 231; the two-bend drainage channel 233 is on the same side as the one-bend drainage channel 232, one end of the two-bend drainage channel 233 is connected with the connecting point of the middle part of the one-bend drainage channel 232 and the straight drainage channel 231, and the other end is connected with the water outlet end of the straight drainage channel 231, and the arc length of the bend of the two-bend drainage channel 233 is less than the arc length of the bend of the one-bend drainage channel 232; there are multiple outlet branch channels 234, and the outlet branch channels 234 are formed between the curved section of the two-bend drainage channel 233 and the end edge of the corrugated area 201. The multiple outlet branch channels 234 in the drainage channel 1 23 and the drainage channel 2 25 are distributed in sequence along the length direction of the end edge of the corrugated area 201.

[0028] Continue to refer to Figure 5 and Figure 6With the centerline of the metal heat exchange plate 2 along its length as the line of symmetry, a water source channel 24, a ring groove 26, a first ring groove 27, a second ring groove 28, a third ring groove 29, and a fourth ring groove 210 are symmetrically stamped on both sides of the diffuser region 202. The water source channel 24 is located between a curved diversion channel 232 and the end edge of the metal heat exchange plate 2. The water source channel 24 connects between the water inlet end of the first diversion channel 23 and the water hole 21 on the same side. The adjacent ends of the water source channels 24 on both sides of the diffuser region 202 are interconnected. As a result, the intersections of the first diversion channel 23, the water source channel 24, and the second diversion channel 25 on both sides of the centerline of the metal heat exchange plate 2 along its length are interconnected. The ring groove 26 is stamped on the outer ring of the water hole 21. Each water hole 21 on the metal heat exchange plate 2 has a ring groove 26 stamped on its outer ring, and the ring groove 26 and the water source channel 24 are interconnected. Bezel 1 27 is located between the water source channel 24 and the end edge of the corrugated region 201. It is punched between the water hole 21 and the curved section of the drainage channel 1 23. Thus, bezel 1 27 connects the water hole 21 and the drainage channel 1 23, and also connects with the bezel 26. Bezel 2 28 is located on the side of the curved drainage channel 232 near the water hole 21. It is punched between bezel 1 27 and the outlet branch channel 234 closest to the edge of the metal heat exchange plate 2. Bezel 2 28 connects with bezel 1 27 and the outlet branch channel 234. Bezel 3 29 is punched on the side of bezel 2 28 near the edge of the metal heat exchange plate 2. One end of bezel 3 29 connects with bezel 2 28, and the other end is flush with the side extension line of the corrugated region 201. The fourth embedded groove 210 is stamped on one side of the water source channel 24 close to the end edge of the metal heat exchange plate 2. One end of the fourth embedded groove 210 is connected to the water outlet end of the water source channel 24, and the other end is close to the end edge of the metal heat exchange plate 2.

[0029] Reference Figure 3 、 Figure 5 、 Figure 6 as well as Figure 7The sealing gasket 3 is made of rubber and includes a sealing edge 31, a sealing ring 32, a return sealing strip 33, a first sealing strip 34, a second sealing strip 35, a third sealing strip 36, a fourth sealing strip 37, and a fifth sealing strip 38. The sealing edge 31 surrounds the edge of the metal heat exchange plate 2. Two sealing rings 32 are provided, each embedded in the ring embedding groove 26 on the same side of the metal heat exchange plate 2 at both ends. Both sealing rings 32 are integrally formed with the sealing edge 31. In addition, two return sealing strips 33, a first sealing strip 34, a second sealing strip 35, a third sealing strip 36, a fourth sealing strip 37, and a fifth sealing strip 38 are each provided and are symmetrically arranged along the centerline of the metal heat exchange plate 2 in the width direction. The return bend sealing strip 33 is embedded in a return bend drainage channel 232, the first sealing strip 34 is embedded in the embedding groove 27, the first sealing strip 34 is connected between the return bend sealing strip 33 and the sealing ring 32, the second sealing strip 35 is embedded in the water source channel 24, one end of the second sealing strip 35 is connected to the sealing ring 32, and the other end is connected to the return bend sealing strip 33, the third sealing strip 36 is embedded in the embedding groove 28, the third sealing strip 36 is connected to the first sealing strip 34, and the fourth sealing strip 37 is embedded in the embedding groove 28. It is arranged in the embedding groove three 29, one end of the sealing strip four 37 is connected to the sealing strip three 36, and the other end is connected to the sealing edge 31. The sealing strip five 38 is embedded in the embedding groove four 210, one end of the sealing strip five 38 is connected to the sealing strip two 35, and the other end is connected to the sealing edge 31. The sealing ring 32 is located within the encirclement of the sealing strip four 37, the sealing strip three 36, the sealing strip one 34, the return sealing strip 33, the sealing strip two 35, the sealing strip five 38 and the sealing edge 31.

[0030] This application can explain its functional principles through the following operation methods:

[0031] The water entering the plate heat exchanger 100 will enter the gap between the metal heat exchange thin plates 2 on both sides through the water holes 21 on the metal heat exchange thin plates 2. The water holes 21 of the embedded ring groove 26 that are not sealed by the sealing gasket 3 will flow out, and the water will enter the water source channel 24 and the embedded groove 1 27 at the same time. The water flowing out of the water source channel 24 will enter the diversion channel 1 23 and the diversion channel 2 25. After the water enters the diversion channel 1 23 and the diversion channel 2 25, the water in the straight diversion channel 231 will be diverted to a bend diversion channel 232. When the water flow in the bend diversion channel 232 flows back to the straight diversion channel 231, it will collide with the water flow in the straight diversion channel 231, thereby reducing the water flow speed in the straight diversion channel 231, and part of the water in the straight diversion channel 231 will enter. Entering the second bend drainage channel 233, when the water flow in the second bend drainage channel 233 flows back to the straight drainage channel 231, it will collide with the water flow in the straight drainage channel 231, thereby further weakening the water flow speed in the straight drainage channel 231. Therefore, the use of the first bend drainage channel 232 and the second bend drainage channel 233 can slow down the water flow entering the diffuser area 202, extend the residence time of the water flow on the metal heat exchange sheet 2, and improve the heat exchange efficiency. In addition, the use of the first bend drainage channel 232 and the second bend drainage channel 233 can also make the water flow orderly diverted and distributed in the diffuser area 202, so that heat exchange can be carried out at each position of the diffuser area 202, and the area of the corrugated area 201 occupied by the diffuser area 202 is not wasted.

[0032] Then, the water flowing out from the second-bend diversion channel 233 will pass through multiple outlet branch channels 234 and enter the herringbone channel 22 of the corrugated area 201, so that the water flow can enter the corrugated area 201 in an orderly manner along the routes of each channel, and the water flow of the outer outlet branch channel 234 can be supplemented by the embedded groove 28. Therefore, each position of the corrugated area 201 in the metal heat exchange plate 2 can fully carry out heat exchange, so that the effective heat exchange area of the metal heat exchange plate 2 is improved, and the heat recovery efficiency of the condensing heat recovery air-conditioning unit is also improved.

[0033] In addition, the embedding groove 28, the embedding groove 1 27, the drainage channel 1 23, the water source channel 24, and the embedding groove 4 210 can all be used as sealing grooves of the sealing gasket 3, so that the water hole 21 that does not need to discharge water is fully sealed, thereby improving the sealing effect of the sealing gasket 3.

[0034] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

[0035] The above is only a preferred specific implementation method of the embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solution and concept of the present application within the technical scope disclosed in the present application, and they should be covered by the scope of protection of the present application.

Claims

1. A condensing heat recovery air conditioning unit, comprising a refrigeration unit, a condenser and a plate heat exchanger, wherein the plate heat exchanger (100) comprises end plates (1) at both ends, a plurality of metal heat exchange thin plates (2), and a sealing gasket (3), wherein water holes (21) are provided at the four corners of the metal heat exchange thin plates (2), and the unit is characterized in that: A plurality of herringbone-shaped channels (22) are punched on the metal heat exchange thin plate (2), and the plurality of herringbone-shaped channels (22) form a corrugated area (201) on the metal heat exchange thin plate (2), and a diffuser area (202) is formed between the end edge of the corrugated area (201) and the end edge of the metal heat exchange thin plate (2); Wherein, with the center line of the metal heat exchange thin plate (2) in the length direction as the symmetry line, the two sides of the diffuser region (202) are symmetrically stamped with a drainage channel (23); The drainage canal 1 (23) includes: A linear drainage channel (231), one end of which faces the corrugated area (201) and the other end of which faces the end edge of the metal heat exchange sheet (2); a curved drainage channel (232) located on one side of the linear drainage channel (231), one end of the curved drainage channel (232) being connected to the water inlet end of the linear drainage channel (231), and the other end being connected to the middle of the linear drainage channel (231); A second bend drainage channel (233) is located on the same side as the first bend drainage channel (232), one end of the second bend drainage channel (233) is connected to the middle connecting portion between the first bend drainage channel (232) and the straight drainage channel (231), and the other end is connected to the water outlet end of the straight drainage channel (231); A plurality of outlet branch channels (234) are provided, formed between the curved section of the second-bend diversion channel (233) and the end edge of the corrugated area (201); A water source channel (24) is connected between the water inlet end of the diversion channel 1 (23) and the water hole (21) on the same side, and the adjacent ends of the water source channels (24) on both sides of the diffuse flow area (202) are connected to each other; The outer ring of each water hole (21) in the metal heat exchange thin plate (2) is punched with an embedded ring groove (26), and an embedded groove (27) is punched between the water hole (21) and the curved section of the drainage channel (23); The sealing gasket (3) comprises: A sealing edge (31) surrounding the edge of the metal heat exchange plate (2); Two sealing rings (32) are provided and are respectively embedded in the ring embedding grooves (26) on the same side of both ends of the metal heat exchange plate (2), and the sealing rings (32) and the sealing edge (31) are integrally formed; A return-bend sealing strip (33) is embedded in the return-bend drainage channel (232); A sealing strip (34) is embedded in the embedding groove (27), and the sealing strip (34) is connected between the return-bend sealing strip (33) and the sealing ring (32); The second sealing strip (35) is embedded in the water source channel (24), one end of the second sealing strip (35) is connected to the sealing ring (32), and the other end is connected to the return bending sealing strip (33).

2. The condensing heat recovery air conditioning unit according to claim 1, characterized in that: A second drainage channel (25) is punched on one side of the drainage channel (23) close to the center line in the length direction of the metal heat exchange thin plate (2). The second drainage channel (25) has the same structure as the first drainage channel (23). The intersections of the drainage channel (23), the water source channel (24), and the second drainage channel (25) on both sides of the center line in the length direction of the metal heat exchange thin plate (2) are connected to each other.

3. The condensing heat recovery air conditioning unit according to claim 2, characterized in that: The edge lines on both sides of the corrugated area (201) are parallel to the edge lines on both sides of the metal heat exchange sheet (2), the edge lines at both ends of the corrugated area (201) are both herringbone-shaped, and the tips are both oriented toward the center direction of the metal heat exchange sheet (2), and the multiple outlet branches (234) in the drainage channel 1 (23) and the drainage channel 2 (25) are all distributed in sequence along the length direction of the end edge of the corrugated area (201).

4. The condensing heat recovery air conditioning unit according to claim 1, characterized in that: A second embedding groove (28) is punched between the first embedding groove (27) and the outlet branch channel (234) closest to the edge of the metal heat exchange thin plate (2), a third embedding groove (29) is punched between the second embedding groove (28) and the side edge of the metal heat exchange thin plate (2), and a fourth embedding groove (210) is punched between the water source channel (24) and the end edge of the metal heat exchange thin plate (2); The sealing gasket (3) further comprises: Sealing strip three (36), embedded in the embedding groove two (28), the sealing strip three (36) is connected to the sealing strip one (34); Sealing strip four (37) is embedded in the embedding groove three (29), one end of the sealing strip four (37) is connected to the sealing strip three (36), and the other end is connected to the sealing edge (31); Sealing strip five (38) is embedded in the embedding groove four (210), one end of the sealing strip five (38) is connected to the sealing strip two (35), and the other end is connected to the sealing edge (31); The sealing ring (32) is located within the enclosure of the sealing strip four (37), the sealing strip three (36), the sealing strip one (34), the return-bend sealing strip (33), the sealing strip two (35), the sealing strip five (38) and the sealing edge (31).

5. The condensing heat recovery air conditioning unit according to claim 4, characterized in that: The end of the embedded groove (210) away from the end edge of the metal heat exchange plate (2) is connected to the end of the water source channel (24) away from the water hole (21).

6. The condensing heat recovery air conditioning unit according to claim 1, characterized in that: The arc length of the second-bend drainage channel (233) at the bend is smaller than the arc length of the first-bend drainage channel (232) at the bend.

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