Evaporative condensers and air conditioning units

Abstract

The embodiment of the present invention provides an evaporative condenser and an air conditioning unit, and relates to the field of air conditioning. The evaporative condenser includes a first collecting tube, a second collecting tube, and a plurality of groups of plate tubes, wherein two adjacent groups of plate tubes form an external channel; the plate tubes have an internal medium channel; the first plate is provided with a first flange facing outwards at the periphery of the first opening, and a second flange facing outwards at the periphery of the second opening; the second plate is provided with a third flange facing outwards at the periphery of the third opening, and a fourth flange facing outwards at the periphery of the fourth opening; the first flanges of adjacent plate tubes are connected to the third flanges to form a first collecting tube, and the second flanges of adjacent plate tubes are connected to the fourth flanges to form a second collecting tube; or the first collecting tube is connected to the first flange and the third flange in sequence, and the second collecting tube is connected to the second flange and the fourth flange in sequence. The embodiment of the present invention can improve the heat exchange efficiency, improve the heat exchange efficiency of the dual working conditions of cooling and heating, and thus improve the efficiency of the air conditioning unit.

Description

Technical Field

[0001] The present invention relates to the field of air conditioning, and in particular to an evaporative condenser and an air conditioning unit. Background Art

[0002] Evaporative condensation technology has good energy-saving effects, but the performance, manufacturing difficulty, cost, reliability, etc. of the heat exchanger need to be further improved, and a high-performance heat exchange mode that takes into account both cooling and heating conditions is still difficult. The present invention improves the heat exchange efficiency of the evaporative condenser by designing an evaporative condenser with a simple structure and convenient processing, especially by improving the heat exchange efficiency of both cooling and heating conditions through special design, thereby improving the efficiency of the air-conditioning unit. Summary of the invention

[0003] The object of the present invention is to provide an evaporative condenser and an air conditioning unit, which can improve the heat exchange efficiency and the heat exchange efficiency of both cooling and heating conditions, thereby improving the efficiency of the air conditioning unit.

[0004] The embodiment of the present invention is achieved as follows:

[0005] In a first aspect, the present invention provides an evaporative condenser, comprising a first collecting tube, a second collecting tube and a plurality of groups of plate tubes, wherein the plurality of groups of plate tubes are arranged in sequence, and two adjacent groups of the plate tubes are spaced apart from each other to form an external channel;

[0006] The plate tube comprises a first plate and a second plate, wherein the first plate and the second plate are connected to form an internal medium channel which is closed on all sides;

[0007] The first plate is provided with a first opening and a second opening communicating with the internal medium channel, and the first plate is provided with a first outward flange at the periphery of the first opening, and a second outward flange at the periphery of the second opening;

[0008] The second plate is provided with a third opening and a fourth opening communicating with the internal medium channel, and the second plate is provided with a third flange facing outwards at the periphery of the third opening, and a fourth flange facing outwards at the periphery of the fourth opening, the first opening and the third opening enclose a first opening of the internal medium channel, and the second opening and the fourth opening enclose a second opening of the internal medium channel;

[0009] The first flanges of two adjacent groups of plate tubes are connected to the third flanges to form the first collecting tube, and the first collecting tube is communicated with the first opening; the second flanges of two adjacent groups of plate tubes are connected to the fourth flanges to form the second collecting tube, and the second collecting tube is communicated with the second opening; or, the first collecting tube is connected to the first flange and the third flange in sequence, and the first collecting tube is communicated with the first opening, the second collecting tube is connected to the second flange and the fourth flange in sequence, and the second collecting tube is communicated with the second opening.

[0010] In an optional embodiment, the first plate is welded to the second plate, and a plurality of connection points and / or connection lines are formed at the positions of the welding points, and a bulge is formed at the positions of the non-welding points, and the bulge forms the internal medium channel.

[0011] In an optional embodiment, on the outer surface of the plate tube, the welding points are arranged in an array and satisfy the following relationship:

[0012] In the first direction: Xi = a*i 2 +b*i+c, where Xi represents the distance between the i-th welding point and the first connection point in the first direction, i is the welding point number in the first direction, and a, b, and c are constants;

[0013] In the second direction: Yj = d*j 2 +e*j+f, wherein Yj represents the distance between the jth welding point and the first connection point in the second direction, j is the welding point serial number in the second direction, and d, e, and f are constants.

[0014] In an optional embodiment, the first port is located above the second port, and the internal medium channel has a first flow hole at the first port, and the first flow hole extends away from the first port in a transverse direction and / or obliquely upward direction;

[0015] And / or, the internal medium channel has a second flow hole at the second opening, the second flow hole extends vertically downward, and / or the second flow hole extends away from the edge of the plate tube.

[0016] In an optional embodiment, the second flow hole includes a first hole extending downward and a second hole extending away from the edge of the plate tube;

[0017] The evaporative condenser further comprises a guide plate, which is disposed in the second collecting pipe and separates the first hole and the second hole into a first area and a second area respectively;

[0018] The guide plate is provided with a connecting hole connecting the first area and the second area, or a gap connecting the first area and the second area is provided between the guide plate and the second collecting pipe.

[0019] In an optional embodiment, the guide plate includes a plate body and end plates arranged at both ends of the plate body, the end plates are connected to the second collecting pipe, the end plates are connected to the second collecting pipe located in the first area, the plate body is provided with the connecting hole, or there is a gap between the plate body and the second collecting pipe that connects the first area and the second area.

[0020] In an optional embodiment, the end plate is provided with a circulation hole, and the circulation hole is arranged at the bottom of the end plate.

[0021] In an optional embodiment, the internal medium flow channel includes two groups, the first opening, the second opening, the third opening and the fourth opening are two corresponding groups, and the two groups of internal medium channels are staggered with each other so that at least part of the water flowing on the plate tube passes through the outer surfaces of the two groups of internal medium channels in sequence.

[0022] In a second aspect, the present invention provides an air conditioning unit, comprising a fan, a water pump, a water receiving tray, a water spraying device, a compressor, a throttling structure, a water-cooled heat exchanger, and an evaporative condenser as described in any one of the aforementioned embodiments;

[0023] The exhaust port of the compressor is connected to the inlet of the internal medium channel, the outlet of the internal medium channel is connected to the inlet of the throttling structure, the outlet of the throttling structure is connected to the refrigerant inlet of the water-cooled heat exchanger, and the refrigerant outlet of the water-cooled heat exchanger is connected to the air intake port of the compressor;

[0024] The water receiving pan is arranged below the evaporative condenser, and the water pump is connected to the water receiving pan and the water spreading device, and is used to spray the water in the water receiving pan through the water spreading device. The water spreading device is used to spray water onto the evaporative condenser, and the fan drives the gas to flow through the evaporative condenser.

[0025] In an optional embodiment, the internal medium channel includes two groups, the first opening, the second opening, the third opening and the fourth opening are two corresponding groups, and the two groups of internal medium channels are staggered with each other, so that the water flowing on the plate tube passes through the outer surfaces of the two groups of internal medium channels in sequence;

[0026] The two groups of internal medium channels include a first channel and a second channel that are independent of each other, the inlet of the first channel is used to be connected to the exhaust port of the compressor, the outlet of the first channel is connected to the refrigerant inlet of the water-cooled heat exchanger, the inlet of the second channel is connected to the cold water inlet of the water-cooled heat exchanger through a first pipeline, and a first valve is arranged on the first pipeline, the first pipeline is also connected to the water outlet on the use side, and the first valve is used for the cold water on the use side to enter the cold water inlet of the water-cooled heat exchanger or enter the second channel;

[0027] The outlet of the second channel is connected to the cold water outlet of the water-cooled heat exchanger through a second pipeline, and a second valve is arranged on the second pipeline. The second pipeline is also connected to the return water port on the use side. The second valve is used to return water from the outlet of the second channel or the cold water outlet of the water-cooled heat exchanger to the return water port on the use side.

[0028] The beneficial effects of the embodiments of the present invention are as follows: through the optimized design, a more efficient processing method can be adopted to form an evaporative condenser, through which the refrigerant circulates through the internal channel, and the spray water and air circulate through the external channel, and the evaporation of the external spray water is used to take away the heat of the internal refrigerant, forming an efficient heat exchange method. In the present invention, the heat exchange efficiency is higher by optimizing the inlet method of the first port and optimizing the flow of the internal channel of the plate by the lattice method. Through the optimized design of the second port, the liquid separation between the plates is made more uniform, which greatly improves the problem of uneven liquid separation in the traditional heating mode that affects the heating effect, and improves the heating efficiency. By setting up staggered circulation channels, it can be achieved that both sides of the spray water in the compression refrigeration and natural cold source modes can intermittently exchange heat with the internal medium, realizing dual high-efficiency operation. After the plate with a flange structure is formed as an integral part through mold processing, the evaporative condenser can be formed by high-efficiency batch welding. Through the optimized design of the channels inside the plate tube, the heat exchange efficiency of the refrigerant inside the plate is improved. Through the design of the inlet channel direction at the first port, the temperature field distribution inside the plate is more uniform, which improves the heat exchange efficiency. Through the design of the channel direction at the second port, the liquid separation between the plates during heating is more uniform, which further improves the heat exchange efficiency of heating. Through the multi-channel design, it can operate in dual high-efficiency mode under natural cold source and compressor cooling mode, so that the heat exchange efficiency of the evaporative condenser can operate efficiently in a variety of application situations. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 A schematic diagram of the structure of an evaporative condenser provided in an embodiment of the present invention;

[0031] Figure 2 A schematic diagram of the structure of another form of evaporative condenser provided by an embodiment of the present invention;

[0032] Figure 3 A schematic diagram of the structure of a plate tube provided in an embodiment of the present invention;

[0033] Figure 4 A schematic diagram of a cross-sectional structure of a plate tube at a bulge provided by an embodiment of the present invention;

[0034] Figure 5 A schematic diagram of the distribution of welding points of a plate tube provided in an embodiment of the present invention;

[0035] Figure 6 A schematic cross-sectional view of a plate tube provided in an embodiment of the present invention;

[0036] Figure 7 A cross-sectional schematic diagram of another plate tube provided by an embodiment of the present invention;

[0037] Figure 8 A cross-sectional schematic diagram of another plate tube provided in an embodiment of the present invention;

[0038] Fig. 9 A cross-sectional structural diagram of a second collecting pipe provided in an embodiment of the present invention;

[0039] Fig.10 for Fig. 9 Sectional view at AA in the middle;

[0040] Fig.11 A cross-sectional structural diagram of a guide plate provided with flow holes and a second collecting pipe provided in an embodiment of the present invention;

[0041] Fig.12 A structural diagram of an evaporative condenser having two first ports and a second port provided in an embodiment of the present invention;

[0042] Fig.13 A structural diagram of an air conditioning unit provided in an embodiment of the present invention.

[0043] Icon: 10-air conditioning unit; 100-evaporative condenser; 101-external channel; 102-first port; 1021-first flow hole; 103-second port; 1031-second flow hole; 1032-first hole; 1033-second hole; 110-first manifold; 120-second manifold; 121-first area; 122-second area; 130-plate tube; 131-first plate; 1 311-first flange; 1312-second flange; 132-second plate; 1321-third flange; 1322-fourth flange; 133-internal medium channel; 140-guide plate; 141-connecting hole; 142-circulation hole; 201-fan; 202-water pump; 203-water tray; 204-water spreading device; 205-compressor; 206-throttling structure; 207-water-cooled heat exchanger. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0045] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0047] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0048] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0049] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] See also Figure 1 and Figure 2 The present invention provides an evaporative condenser 100, comprising a first collecting tube 110, a second collecting tube 120 and a plurality of plate tubes 130, wherein the plurality of plate tubes 130 are arranged in sequence, and two adjacent groups of plate tubes 130 are spaced apart from each other to form an external channel 101.

[0051] See also Figure 3 and Figure 4 The plate tube 130 includes a first plate 131 and a second plate 132, which are connected to form an internal medium channel 133 that is closed on all sides; the first plate 131 is provided with a first opening and a second opening that are connected to the internal medium channel 133, and the first plate 131 is provided with a first outward flange 1311 at the periphery of the first opening, and a second outward flange 1312 at the periphery of the second opening; the second plate 132 is provided with a third opening and a fourth opening that are connected to the internal medium channel 133, and the second plate 132 is provided with a third outward flange 1321 at the periphery of the third opening, and a fourth outward flange 1322 at the periphery of the fourth opening, the first opening and the third opening surround the first opening 102 of the internal medium channel 133, and the second opening and the fourth opening surround the second opening 103 of the internal medium channel 133;

[0052] like Figure 1 As shown, the first flanges 1311 and the third flanges 1321 of two adjacent groups of plate tubes 130 are connected to form a first collecting tube 110, and the first collecting tube 110 is communicated with the first opening, and the second flanges 1312 and the fourth flanges 1322 of the two adjacent groups of plate tubes 130 are connected to form a second collecting tube 120, and the second collecting tube 120 is communicated with the second opening; or Figure 2As shown, the first collecting pipe 110 is connected to the first flange 1311 and the third flange 1321 in sequence, and the first collecting pipe 110 is communicated with the first opening, and the second collecting pipe 120 is connected to the second flange 1312 and the fourth flange 1322 in sequence, and the second collecting pipe 120 is communicated with the second opening.

[0053] See also Figure 5 In an optional embodiment, the first plate 131 and the second plate 132 are welded to form a plurality of connection points and / or connection lines at the welding points, and a bulge is formed at the non-welding point, and the bulge forms an internal medium channel 133.

[0054] In an optional embodiment, on the outer surface of the plate tube 130, the welding points are arranged in an array and satisfy the following relationship:

[0055] In the first direction: Xi = a*i 2 +b*i+c, where Xi represents the distance between the i-th solder joint and the first connection point in the first direction, i is the solder joint number in the first direction, and a, b, and c are constants; for example, Figure 5 X1 and X2 in .

[0056] In the second direction: Yj = d*j 2 +e*j+f, where Yj represents the distance between the jth solder joint in the second direction and the first connection point, j is the solder joint number in the second direction, and d, e, and f are constants. Figure 5 Y1 and Y2 in .

[0057] It should be noted that this embodiment does not make specific requirements on the parameters in the arrangement relationship in the first direction and the second direction. For example, in the first direction, a=2.25, b=26, c=1.75 is taken, then the above formula can be converted to: i =2.25×i 2 +26×i+1.75; in the second direction, take d=4.25, e=11, f=14, then the above formula can be converted to: Y j =4.25×j 2 +26×j+1.75.

[0058] When the connection points satisfy the above formula, the flow of the inner channel of the plate tube 130 is achieved by adjusting the spacing of the dot patterns, which can make the refrigerant flow more evenly in the inner channel, improve the heat transfer coefficient, and achieve the purpose of further improving the heat exchange efficiency.

[0059] See also Figure 6 and Figure 7, which shows a solution of forming an internal medium channel 133 through straight lines, which can improve the heat exchange efficiency under certain circumstances by organizing the refrigerant to flow through the channel. By setting this way, the lubricating oil in the refrigerant can be effectively organized to flow out of the plate tube 130 through the internal flow channel, so that the refrigerant can take the lubricating oil away from the evaporative condenser 100 as much as possible and return to the compressor 205. It should be pointed out that, relative to Figure 6 For example, Figure 7 A gap is provided at the edge ( Figure 7 There is a gap between the horizontal straight lines and the edges), and the refrigerant can flow through the gap, which can improve the problem of storing lubricating oil in the corner structure (area), so that the refrigerant can take the lubricating oil away from the evaporative condenser 100 as much as possible and return to the compressor 205.

[0060] See also Figure 8 In an optional embodiment, the first port 102 is located above the second port 103, and the internal medium channel 133 has a first flow hole 1021 at the first port 102, and the first flow hole 1021 extends laterally and / or obliquely upward away from the first port 102; and / or, the internal medium channel 133 has a second flow hole 1031 at the second port 103, and the second flow hole 1031 extends vertically downward, and / or the second flow hole 1031 extends away from the edge of the plate tube 130.

[0061] In an optional embodiment, the second flow hole 1031 includes a first hole 1032 extending downward and a second hole 1033 extending away from the edge of the plate tube 130 .

[0062] See also Fig. 9 and Fig.10 The evaporative condenser 100 also includes a guide plate 140, which is arranged in the second collecting pipe 120 and separates the first hole 1032 and the second hole 1033 into the first area 121 and the second area 122 respectively; the guide plate 140 is provided with a connecting hole 141 connecting the first area 121 and the second area 122, or a gap connecting the first area 121 and the second area 122 is provided between the guide plate 140 and the second collecting pipe 120.

[0063] In an optional embodiment, the guide plate 140 includes a plate body and end plates arranged at both ends of the plate body, the end plates are connected to the second collecting pipe 120, the end plates are connected to the second collecting pipe 120 located in the first area 121, the plate body is provided with a connecting hole 141, or there is a gap between the plate body and the second collecting pipe 120 that connects the first area 121 and the second area 122.

[0064] See also Fig.11 In an optional embodiment, a flow hole 142 is provided on the end plate, and the flow hole 142 is provided at the bottom of the end plate.

[0065] In the embodiment of the present invention, when the evaporative condenser 100 is cooling: the refrigerant flows into the first port 102 of each group of plate tubes 130 through the first collecting pipe 110, and then flows into the plate tubes 130 in two directions, so that the temperature field distribution in the plate tubes 130 is more uniform, the heat exchange area of ​​the plate tubes 130 is more fully utilized, and the heat exchange effect of cooling is improved. When heating: the refrigerant flows into the second port 103 of each group of plate tubes 130 through the second collecting pipe 120. Since the imported refrigerant is in a gas-liquid two-phase state under this condition, the design scheme of the present invention makes the refrigerant liquid separation between each group of plate tubes 130 more uniform, and efficient heating operation is achieved.

[0066] See also Fig.12 In an optional embodiment, the internal medium flow channel includes two groups, the first opening, the second opening, the third opening and the fourth opening are two corresponding groups, and the two groups of internal medium channels 133 are staggered with each other so that at least part of the water flowing on the plate tube 130 passes through the outer surfaces of the two groups of internal medium channels 133 in sequence.

[0067] In addition, it should be pointed out that the evaporative condenser 100 provided in the embodiment of the present invention can be manufactured according to the following process: 1) sheet metal is pressed into shape; 2) solder is set between the sheets and the solder is set at the flanges; 3) the sheets are installed as set, and tooling is provided to press the sheets and flanges; 4) the whole is heated until the solder melts, and then cooled to form.

[0068] Please refer to Figures 1 to 12 The evaporative condenser 100 provided in the embodiment of the present invention can take into account both heating and cooling working conditions. In the cooling working condition: the refrigerant flows inside the evaporative condenser 100, water is sprayed on the outer surface of the evaporative condenser 100, and air flows through the outer surface, causing the water to evaporate and take away the heat of the inner refrigerant; the high-temperature and high-pressure gaseous refrigerant flows into the first port 102 of each group of plate tubes 130 through the first collecting pipe 110 of the evaporative condenser 100, and the refrigerant flows into the internal channel of the plate tube 130 in two directions through the inlet directions set in the two directions of the first port 102. Through the optimized internal channel design, the heat transfer coefficient in the plate tube 130 is improved, thereby making the operation more efficient under the cooling working condition. In heating conditions: through the two-way inflow design of the second collecting pipe 120, the guide plate 140, and the second port 103 of the plate tube, the liquid refrigerant distributed to each plate tube 130 through the second collecting pipe 120 is more uniform, thereby improving the heat exchange efficiency of the entire heat exchanger, thereby achieving more efficient operation of the unit in heating conditions.

[0069] See also Fig.13The present invention provides an air conditioning unit 10, comprising a fan 201, a water pump 202, a water receiving tray 203, a water spraying device 204, a compressor 205, a throttling structure 206, a water-cooled heat exchanger 207 and an evaporative condenser 100 as in any one of the aforementioned embodiments;

[0070] The exhaust port of the compressor 205 is connected to the inlet of the internal medium channel 133, the outlet of the internal medium channel 133 is connected to the inlet of the throttling structure 206, the outlet of the throttling structure 206 is connected to the refrigerant inlet of the water-cooled heat exchanger 207, and the refrigerant outlet of the water-cooled heat exchanger 207 is connected to the air intake port of the compressor 205; the water receiving tray 203 is arranged below the evaporative condenser 100, the water pump 202 is connected to the water receiving tray 203 and the water spraying device 204, and is used to spray the water in the water receiving tray 203 through the water spraying device 204, the water spraying device 204 is used to spray water to the evaporative condenser 100, and the fan 201 drives the gas to flow through the evaporative condenser 100.

[0071] In an optional embodiment, the internal medium channel 133 includes two groups, the first opening, the second opening, the third opening and the fourth opening are two corresponding groups, and the two groups of internal medium channels 133 are staggered so that the water flowing on the plate tube 130 passes through the outer surfaces of the two groups of internal medium channels 133 in sequence; the two groups of internal medium channels 133 include a first channel and a second channel that are independent of each other, the inlet of the first channel is used to connect to the exhaust port of the compressor 205, the outlet of the first channel is connected to the refrigerant inlet of the water-cooled heat exchanger 207, and the inlet of the second channel is connected to the water-cooled heat exchanger 207. The cold water inlet of the heat exchanger 207 is connected through a first pipeline, and a first valve is arranged on the first pipeline. The first pipeline is also connected to the water outlet on the use side. The first valve is used for the cold water on the use side to enter the cold water inlet of the water-cooled heat exchanger 207 or enter the second channel; the outlet of the second channel is connected to the cold water outlet of the water-cooled heat exchanger 207 through a second pipeline, and a second valve is arranged on the second pipeline. The second pipeline is also connected to the return water port on the use side. The second valve is used to return water from the outlet of the second channel or the cold water outlet of the water-cooled heat exchanger 207 to the return water port on the use side.

[0072] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An evaporative condenser, characterized in that: It comprises a first collecting tube (110), a second collecting tube (120) and a plurality of groups of plate tubes (130), wherein the plurality of groups of plate tubes (130) are arranged in sequence, and two adjacent groups of the plate tubes (130) are spaced apart from each other to form an external channel (101); The plate tube (130) comprises a first plate (131) and a second plate (132), wherein the first plate (131) and the second plate (132) are connected to form an internal medium channel (133) that is closed on all sides; The first plate (131) is provided with a first opening and a second opening communicating with the internal medium channel (133), and the first plate (131) is provided with a first outward flange (1311) at the periphery of the first opening, and a second outward flange (1312) at the periphery of the second opening; The second plate (132) is provided with a third opening and a fourth opening which are in communication with the internal medium channel (133); the second plate (132) is provided with a third outward flange (1321) at the periphery of the third opening, and a fourth outward flange (1322) at the periphery of the fourth opening; the first opening and the third opening form a first opening (102) of the internal medium channel (133); and the second opening and the fourth opening form a second opening (103) of the internal medium channel (133); The first flanges (1311) and the third flanges (1321) of two adjacent groups of plate tubes (130) are connected to form the first collecting tube (110), and the first collecting tube (110) is communicated with the first opening; the second flanges (1312) and the fourth flanges (1322) of the two adjacent groups of plate tubes (130) are connected to form the second collecting tube (120), and the second collecting tube (120) is communicated with the second opening; or the first collecting tube (110) is connected to the first flange (1311) and the third flange (1321) in sequence, and the first collecting tube (110) is communicated with the first opening, the second collecting tube (120) is connected to the second flange (1312) and the fourth flange (1322) in sequence, and the second collecting tube (120) is communicated with the second opening; The first plate (131) and the second plate (132) are welded to form a plurality of connection points and / or connection lines at the welding points, and a bulge is formed at a position other than the welding point, wherein the bulge forms the internal medium channel (133); On the outer surface of the plate tube (130), the welding points are arranged in an array and satisfy the following relationship: In the first direction: Xi=a*i 2 +b*i+c, where Xi represents the distance between the i-th welding point and the first connection point in the first direction, i is the welding point number in the first direction, and a, b, and c are constants; In the second direction: Yj=d*j 2 +e*j+f, where Yj represents the distance between the jth welding point and the first connection point in the second direction, j is the welding point number in the second direction, and d, e, and f are constants; The internal medium channels (133) include two groups, the first opening, the second opening, the third opening and the fourth opening are two corresponding groups, and the two groups of internal medium channels (133) are arranged alternately with each other, so that at least part of the water flowing on the plate tube (130) passes through the outer surfaces of the two groups of internal medium channels (133) in sequence.

2. The evaporative condenser according to claim 1, characterized in that: The first port (102) is located above the second port (103), the internal medium channel (133) has a first flow hole (1021) at the first port (102), and the first flow hole (1021) extends away from the first port (102) in a transverse direction and / or obliquely upward direction; And / or, the internal medium channel (133) has a second flow hole (1031) at the second port (103), the second flow hole (1031) extends vertically downward, and / or the second flow hole (1031) extends away from the edge of the plate tube (130).

3. The evaporative condenser according to claim 2, characterized in that: The second flow hole (1031) comprises a first hole (1032) extending downward and a second hole (1033) extending away from the edge of the plate tube (130); The evaporative condenser (100) further comprises a guide plate (140), wherein the guide plate (140) is arranged in the second collecting pipe (120) and separates the first hole (1032) and the second hole (1033) into a first area (121) and a second area (122), respectively; The guide plate (140) is provided with a connecting hole (141) connecting the first area (121) and the second area (122); or, a gap connecting the first area (121) and the second area (122) is provided between the guide plate (140) and the second collecting pipe (120).

4. The evaporative condenser according to claim 3, characterized in that: The guide plate (140) comprises a plate body and end plates arranged at both ends of the plate body, the end plates are connected to the second collecting pipe (120), the end plates are connected to the second collecting pipe (120) located in the first area (121), the plate body is provided with the connecting hole (141), or there is a gap between the plate body and the second collecting pipe (120) for connecting the first area (121) and the second area (122).

5. The evaporative condenser according to claim 4, characterized in that: The end plate is provided with a circulation hole (142), and the circulation hole (142) is arranged at the bottom of the end plate.

6. An air conditioning unit (10), characterized in that: It comprises a fan (201), a water pump (202), a water receiving tray (203), a water spreading device (204), a compressor (205), a throttling structure (206), a water-cooled heat exchanger (207), and an evaporative condenser (100) according to any one of claims 1 to 5; The exhaust port of the compressor (205) is connected to the inlet of the internal medium channel (133), the outlet of the internal medium channel (133) is connected to the inlet of the throttling structure (206), the outlet of the throttling structure (206) is connected to the refrigerant inlet of the water-cooled heat exchanger (207), and the refrigerant outlet of the water-cooled heat exchanger (207) is connected to the air intake port of the compressor (205); The water receiving tray (203) is arranged below the evaporative condenser (100); the water pump (202) is connected to the water receiving tray (203) and the water spraying device (204) and is used to spray water in the water receiving tray (203) through the water spraying device (204); the water spraying device (204) is used to spray water toward the evaporative condenser (100); and the fan (201) drives gas to flow through the evaporative condenser (100).

7. The air conditioning unit (10) according to claim 6, characterized in that: The internal medium channels (133) include two groups, the first opening, the second opening, the third opening and the fourth opening are two corresponding groups, and the two groups of internal medium channels (133) are arranged alternately with each other, so that water flowing on the plate tube (130) passes through the outer surfaces of the two groups of internal medium channels (133) in sequence; The two groups of internal medium channels (133) include a first channel and a second channel that are independent of each other, the inlet of the first channel is used to be connected to the exhaust port of the compressor (205), the outlet of the first channel is connected to the refrigerant inlet of the water-cooled heat exchanger (207), the inlet of the second channel is connected to the cold water inlet of the water-cooled heat exchanger (207) via a first pipeline, and a first valve is arranged on the first pipeline, the first pipeline is also connected to the water outlet on the use side, and the first valve is used for the cold water on the use side to enter the cold water inlet of the water-cooled heat exchanger (207) or enter the second channel; The outlet of the second channel is connected to the cold water outlet of the water-cooled heat exchanger (207) via a second pipeline, and a second valve is provided on the second pipeline. The second pipeline is also connected to the return water port on the use side, and the second valve is used to return water from the outlet of the second channel or the cold water outlet of the water-cooled heat exchanger (207) to the return water port on the use side.

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