A cascade evaporative cooling heat pump modular unit

Abstract

The present invention relates to a cascade evaporative cooling heat pump modular unit, which includes an evaporative cooling heat exchanger, an air-cooled heat exchanger, and a refrigerant operation assembly; the evaporative cooling heat exchanger and the air-cooled heat exchanger are connected to the refrigerant operation assembly in parallel; the refrigerant operation assembly is used to operate the refrigerant to exchange heat in the evaporative cooling or air-cooled heat exchanger; the evaporative cooling heat exchanger includes at least one heat exchange unit; the heat exchange unit is in a plate-like structure, continuous, and in a concave-convex undulating shape; the heat exchange unit further includes a cooling outer tube, a water distribution tank, and a cooling inner tube; water distribution microporous plates are arranged on both sides of the water distribution tank; the water distribution microporous plates are connected to the walls of the cooling outer tube and the condensing tube, and the water distribution tank and the cooling inner tube are used to exchange heat with the refrigerant on the inner and outer sides of the refrigerant heat exchange channel. The cascade evaporative cooling heat pump modular unit of the present invention adopts a cascade evaporative cooling heat exchanger, has high heat exchange efficiency, saves water, and is convenient for maintenance; it can not only refrigerate but also heat; it has a small volume and high stability; it is easy to construct; it has low noise and reduces the use cost.

Description

Technical Field

[0001] The present invention relates to the field of heat pump units, and particularly to a cascade evaporative cooling heat pump modular unit. Background Art

[0002] Water-cooled air conditioners have significantly higher refrigeration efficiency than air-cooled air conditioners, so they are the preferred equipment in the field of central air-conditioning refrigeration. However, due to the large volume of water-cooled air conditioners, they are not convenient for installation, transportation, maintenance, etc. Especially, they occupy a large area of indoor space, causing waste of buildings. Therefore, the miniaturization and modularization of the unit will become an inevitable trend in the development of water-cooled chillers. However, the existing shell-and-tube condensers or evaporative condensers commonly used in water-cooled chillers have problems such as large volume, low efficiency, and serious waste of cooling water caused by the phenomenon of "water splashing", which restricts the miniaturization and modularization of water-cooled chillers.

[0003] In existing water-cooled chillers, the water-cooled shell-and-tube condensers and evaporative condensation heat exchangers also have the following problems:

[0004] Shell-and-tube condenser: The process of refrigeration air-conditioning operation is the process of transferring heat from the client to the outside. Obtaining a lower degree of subcooling of the refrigerant is the premise for the stable and efficient operation of the air conditioner. To make the high-temperature and high-pressure refrigerant vapor discharged from the compressor approach the outdoor ambient temperature to the greatest extent, it is required that the refrigerant flow path in the heat exchanger, that is, the tube side, is long enough. Considering the heat transfer capacity and manufacturing cost, the shell-and-tube heat exchanger has a large volume and high power, so it is not conducive to the miniaturization of the heat exchanger; the latent heat of vaporization of the cooling water is dozens of times that of the heat transfer heat, and the closed heat transfer method between the shell and the tube of the shell-and-tube heat exchanger is not conducive to the vaporization and evaporation of water, restricting the heat transfer efficiency of the heat exchanger. Therefore, the efficiency needs to be improved, the volume needs to be reduced, and it is convenient for the miniaturization of the air conditioner.

[0005] Evaporative condensation heat exchanger: Existing evaporative cooling heat exchangers do not have a water distribution device and need to be used in conjunction with a spraying device. This increases the volume of the air-conditioning unit and the manufacturing cost, and is not conducive to the miniaturization of the unit; during the cooling process, the cooling water sprayed downward generates a countercurrent with the air under negative pressure in the unit cavity, resulting in a large amount of "water splashing" and "water drifting" phenomena, which not only causes waste of water resources but also reduces the cooling efficiency.

[0006] Whether it is an evaporative condensation heat exchanger or a water-cooled shell-and-tube heat exchanger, they are both single-cooling-medium and single-heat-transfer-surface wall heat exchange structures. The cooling medium and the refrigerant exchange heat through the tube wall between the two media. This structure limits the heat transfer surface between the two media and is not conducive to heat transfer. Summary of the Invention

[0007] To solve the above technical problems, the present invention provides a cascade evaporative cooling heat pump modular unit, which adopts a cascade evaporative cooling heat exchanger, has high heat exchange efficiency, saves water and is easy to maintain; it can not only refrigerate but also heat; it has a small volume and high stability; it is easy to construct; it has low noise and reduces the use cost.

[0008] The technical solution adopted by the present invention to solve its technical problems is: a cascade evaporative cooling heat pump modular unit, which includes an evaporative cooling heat exchanger, an air-cooled heat exchanger, and a refrigerant operation assembly; the evaporative cooling heat exchanger and the air-cooled heat exchanger are connected in parallel and then connected to the refrigerant operation assembly; the refrigerant operation assembly is used to operate the refrigerant to exchange heat in the evaporative cooling heat exchanger or the air-cooled heat exchanger.

[0009] The evaporative cooling heat exchanger includes a plurality of heat exchange plates, and the plurality of heat exchange plates are arranged at intervals along a direction perpendicular to the evaporation heat exchange surface; each heat exchange plate includes at least one heat exchange unit; the heat exchange unit is a plate-like structure formed by horizontally arranging a plurality of horizontal sections of condensing pipes vertically, and both ends of the plurality of horizontal sections of condensing pipes are connected by condensing pipe bending sections to form at least one refrigerant heat exchange channel, and both sides of the plate-like structure form an evaporation heat exchange surface; there is no gap connection between adjacent two horizontal sections of condensing pipes vertically arranged in the plate-like structure, so that the evaporation heat exchange surface has continuity and is concave-convex; a bracket is arranged between the cooling outer pipe and the horizontal section of the condensing pipe in the water distribution tank; a cooling outer pipe is also arranged above the uppermost horizontal section of the condensing pipe; a water distribution tank is also arranged between the cooling outer pipe and the uppermost horizontal section of the condensing pipe; water distribution microporous plates are arranged on both sides of the water distribution tank; the upper end of the water distribution microporous plate is connected to the pipe wall of the cooling outer pipe, and the lower end is connected to the pipe wall of the uppermost horizontal section of the condensing pipe, so that the water distribution tank is fixed between the cooling outer pipe and the heat exchange unit in an embedded manner to form an integral structure; the cooling outer pipe is provided with a number of water outlet holes communicated with the water distribution tank for uniformly injecting water into the water distribution tank; the water distribution tank is used to evenly distribute the water injected by the cooling outer pipe through the water distribution microporous plates on the evaporation heat exchange plate surface to form a water curtain to exchange heat with the refrigerant outside the refrigerant heat exchange channel; a cooling inner pipe is also arranged in the refrigerant heat exchange channel for the water in the cooling inner pipe to exchange heat with the refrigerant inside the refrigerant heat exchange channel.

[0010] Further, the heat exchange plate includes a plurality of the heat exchange units; the plurality of heat exchange units are arranged vertically, and adjacent two heat exchange units are connected by a condensing pipe bending section so that their respective refrigerant heat exchange channels are correspondingly communicated; the top of the cooling outer pipe in the lower heat exchange unit among adjacent two heat exchange units is connected to the bottom of the lowermost horizontal section of the condensing pipe in the upper heat exchange unit; a plurality of the brackets are arranged at intervals between the bottom of the cooling outer pipe and the top of the uppermost horizontal section of the heat exchange unit to which they belong.

[0011] Further, the connection mode of the cooling outer pipe, the water distribution tank, and the water distribution microporous plate between two adjacent heat exchange units is replaced as follows: a water distribution tank is arranged above the cooling outer pipe, water distribution microporous plates are arranged on both sides of the water distribution tank, the lower end of the water distribution microporous plate is connected to the pipe wall of the cooling outer pipe, and the upper end is connected to the pipe wall of the horizontal section of the lowest condensation pipe of the heat exchange unit on the upper side; the bottom of the cooling outer pipe is connected to the top of the horizontal section of the uppermost condensation pipe in the heat exchange unit to which it belongs; a plurality of the brackets are arranged at intervals between the top of the cooling outer pipe and the bottom of the horizontal section of the lowest condensation pipe of the heat exchange unit on the upper side.

[0012] Further, a water distribution tank is arranged between the horizontal section of the lowest condensation pipe of the heat exchange unit on the upper side and the horizontal section of the uppermost condensation pipe of the heat exchange unit on the lower side, water distribution microporous plates are arranged on both sides of the water distribution tank, the lower end of the water distribution microporous plate is connected to the pipe wall of the horizontal section of the uppermost condensation pipe of the heat exchange unit on the lower side, and the upper end is connected to the pipe wall of the horizontal section of the lowest condensation pipe of the heat exchange unit on the upper side; the cooling outer pipe is arranged through the water distribution tank.

[0013] Further, the top of the cooling outer pipe is connected to the bottom of the horizontal section of the lowest condensation pipe of the heat exchange unit on the upper side and there is a distance from the horizontal section of the uppermost condensation pipe of the heat exchange unit to which it belongs, and a plurality of the brackets are arranged at intervals between the bottom of the cooling outer pipe and the top of the horizontal section of the uppermost condensation pipe of the heat exchange unit to which the cooling outer pipe belongs.

[0014] Further, the bottom of the cooling outer pipe is connected to the top of the horizontal section of the uppermost condensation pipe of the heat exchange unit to which it belongs and there is a distance from the horizontal section of the lowest condensation pipe of the heat exchange unit on the upper side, and a plurality of the brackets are arranged at intervals between the top of the cooling outer pipe and the bottom of the horizontal section of the lowest condensation pipe of the heat exchange unit on the upper side.

[0015] Further, in two adjacent heat exchange units, the number of horizontal sections of the condensation pipes in the heat exchange unit on the lower side is less than that in the heat exchange unit on the upper side, so that the heat exchange area of the evaporation heat exchange surfaces of multiple heat exchange units decreases from top to bottom; the number of water outlet holes of the cooling outer pipe in the heat exchange unit on the lower side is less than that of the cooling outer pipe on the upper side, so as to meet the water distribution requirements of the evaporation heat exchange surfaces corresponding to the heat exchange areas.

[0016] Further, a refrigerant vapor inlet is provided at the top end of the refrigerant heat exchange channel of the heat exchange plate, and a refrigerant liquid outlet is provided at the bottom end; an external cooling water inlet is provided at one end of the cooling outer pipe of the heat exchange plate; both ends of the cooling inner pipe penetrate through the refrigerant heat exchange channel, an internal cooling water inlet is provided at the bottom end, and an internal cooling water outlet is provided at the top end; the refrigerant vapor inlets of multiple heat exchange plates are connected to a first refrigerant vapor main pipe, the refrigerant liquid outlets of multiple heat exchange plates are connected to a first refrigerant liquid main pipe, and the external cooling water inlets of the cooling outer pipes of multiple heat exchange plates are connected to an external cooling water inlet manifold pipe; the external cooling water inlet manifold pipe is further connected to a cooling auxiliary pipe; the internal cooling water inlets of multiple cooling inner pipes are connected to a cooling main pipe, and the internal cooling water outlets are connected to an internal cooling water outlet collecting pipe; the internal cooling water outlet collecting pipe is communicated with the cooling auxiliary pipe.

[0017] Further, the air-cooled heat exchanger is connected to a second refrigerant vapor main pipe and a second refrigerant liquid main pipe; the first refrigerant vapor main pipe and the second refrigerant vapor main pipe are connected in parallel and then connected to the refrigerant operation assembly, and the first refrigerant liquid main pipe and the second refrigerant liquid main pipe are connected in parallel and then connected to the refrigerant operation assembly; a first solenoid valve is provided on the first refrigerant vapor main pipe, and a second solenoid valve is provided on the second refrigerant vapor main pipe.

[0018] Further, the unit further includes a water tank; a water pump is provided in the water tank; the water outlet end of the water pump is communicated with the cooling main pipe, and is used for sending the cooling water in the water tank into the cooling inner pipe of the evaporative condenser through the cooling main pipe and sending it into the external cooling pipe through the cooling auxiliary pipe.

[0019] Further, the water tank is further provided with a water replenishing port; a sewage discharge pipe is connected to the bottom of the water tank; a sewage discharge solenoid valve is provided on the sewage discharge pipe.

[0020] Further, a cooling filler layer is further provided between the evaporative condenser and the water tank, and is used for cooling the unevaporated water dripping from the evaporative condenser and then discharging it into the water tank.

[0021] Further, the refrigerant operation assembly includes a compressor, a four-way valve, a first solenoid valve, a second solenoid valve, a first check valve, a liquid storage tank, a dryer filter, an economizer, a first expansion valve, a second check valve, a gas-liquid separator, a third solenoid valve, a second expansion valve, a third check valve, a fourth check valve; the unit further includes a multi-connected indoor unit; the compressor has an air outlet, a suction port and an enthalpy-increasing port; the four-way valve has an a end, a b end, a c end, a d end; the economizer has an e end, an f end, a g end, an h end, the e end and the f end are communicated inside the economizer, and the g end and the h end are communicated inside the economizer; the multi-connected indoor unit has a j end and a k end, and the j end and the k end are two ports of the refrigerant channel of the multi-connected indoor unit.

[0022] Further, the outlet of the compressor, the a-end and b-end of the four-way valve, the pipeline parallel to the first refrigerant vapor main pipe / second refrigerant vapor main pipe, the first refrigerant vapor main pipe of the evaporative cooler, and the first solenoid valve are connected to the first refrigerant liquid main pipe, the first check valve, the liquid storage tank, the drier filter, the h-end and g-end of the economizer, the first expansion valve, the second check valve, the j-end and k-end of the multi-connected indoor unit, the d-end and c-end of the four-way valve, the gas-liquid separator, and the suction port of the compressor to form the first refrigeration operation channel.

[0023] Further, the outlet of the compressor, the a-end and b-end of the four-way valve, the pipeline parallel to the first refrigerant vapor main pipe / second refrigerant vapor main pipe, the second refrigerant vapor main pipe of the air-cooled heat exchanger, and the second solenoid valve are connected to the second refrigerant liquid main pipe, the first check valve, the liquid storage tank, the drier filter, the h-end and g-end of the economizer, the first expansion valve, the second check valve, the j-end and k-end of the multi-connected indoor unit, the d-end and c-end of the four-way valve, the gas-liquid separator, and the suction port of the compressor in sequence to form the second refrigeration operation channel.

[0024] Further, the outlet of the compressor, the a-end and d-end of the four-way valve, the k-end and j-end of the multi-connected indoor unit, the third check valve, the liquid storage tank, the drier filter, the h-end and g-end of the economizer, the first expansion valve, the fourth check valve, the pipeline parallel to the first refrigerant liquid main pipe / second refrigerant liquid main pipe, the first refrigerant liquid main pipe and the first refrigerant vapor main pipe of the evaporative cooler and the first solenoid valve, the b-end and c-end of the four-way valve, the gas-liquid separator, and the suction port of the compressor are connected in sequence to form the first heating operation channel.

[0025] Further, the outlet of the compressor, the a-end and d-end of the four-way valve, the k-end and j-end of the multi-connected indoor unit, the third check valve, the liquid storage tank, the drier filter, the h-end and g-end of the economizer, the first expansion valve, the fourth check valve, the pipeline parallel to the first refrigerant liquid main pipe / second refrigerant liquid main pipe, the second refrigerant liquid main pipe and the second refrigerant vapor main pipe of the air-cooled heat exchanger and the second solenoid valve, the b-end and c-end of the four-way valve, the gas-liquid separator, and the suction port of the compressor are connected in sequence to form the second heating operation channel.

[0026] Further, in the first heating operation channel and the second heating operation channel, the outlet of the drier filter, the second expansion valve, the e-end and f-end of the economizer, the third solenoid valve, and the enthalpy-increasing port of the compressor are connected in sequence to form an auxiliary enthalpy-increasing loop; the internal channel between the e-end and f-end in the economizer exchanges heat with the internal channel between the h-end and g-end.

[0027] Further, the unit further includes a casing, and a ventilation opening is provided at the top of the casing; a fan is provided in the ventilation opening; the evaporative cooling heat exchanger and the cooling packing layer are sequentially arranged below the fan; the air-cooled heat exchanger is arranged outside the evaporative cooling heat exchanger; the water tank is arranged below the evaporative cooling heat exchanger and the air-cooled heat exchanger, and an air grille is further provided on the side wall of the casing corresponding to the air-cooled heat exchanger; a water separation plate is further arranged between the fan and the evaporative cooling heat exchanger; an equipment room is further provided below the water tank in the casing; the refrigerant operation assembly is installed in the equipment room, and an electric control box is further provided in the equipment room for controlling the fan, water pump, compressor, four-way valve, first solenoid valve, second solenoid valve and third solenoid valve.

[0028] Further, the unit does not include a multi-connected indoor unit, and the unit is connected to an indoor heat exchanger; the indoor heat exchanger includes an outdoor heat exchange part and an indoor heat exchange part; the outdoor heat exchange part and the indoor heat exchange part are communicated through a coolant channel; the outdoor heat exchange part further includes a refrigerant heat exchange channel for exchanging heat with the coolant channel; the refrigerant heat exchange channel has an m end and an n end, and the m end and the n end are respectively connected to the refrigerant operation assembly instead of the j end and the k end of the multi-connected indoor unit; the outdoor heat exchange part is arranged in the equipment room in the unit.

[0029] Advantages of the present invention: A cascade evaporative cooling heat pump module unit of the present invention adopts a design of parallel connection of an air-cooled heat exchanger and an evaporative cooling heat exchanger, which can not only refrigerate through air and water, but also heat through air and industrial waste heat wastewater; the adopted design of the cascade evaporative cooling heat exchanger combines shell-and-tube closed convection heat exchange and open-type evaporative cooling heat exchange, changes the limitation of the single heat exchange area on the same side between two media of the traditional heat exchanger, and uses two heat exchange surfaces of the inner and outer tubes for heat exchange, increasing the heat exchange area of the refrigerant; the same heat exchanger simultaneously realizes two heat exchange methods of water-cooled heat exchange and evaporative cooling heat exchange, and the secondary heat exchange between the cooling water and the refrigerant achieves a cascade heat exchange effect, which can greatly improve the heat exchange efficiency, reduce the volume of the heat exchanger, save water, and is convenient for maintenance; the volume of a single unit is small, which is convenient for transportation and installation. Multiple units are connected in parallel and modularly installed, which can replace the traditional large-scale water-cooled chillers, improving the operation stability of the entire air-conditioning system; the unit can be directly installed on the roof of the building without a dedicated machine room, reducing the construction volume of the installation project and the construction difficulty; the noise generated by the whole unit can be controlled below 65Pb, and no additional noise reduction treatment is required for the unit, reducing the use cost. Description of the Drawings

[0030] Figure 1 It is a schematic diagram of a cascade evaporative cooling heat pump module unit for Embodiment 1;

[0031] Figure 2 It is a schematic diagram of the refrigerant operation assembly of a cascade evaporative cooling heat pump module unit for Embodiment 1;

[0032] Figure 3 Schematic three-dimensional view of the evaporative cooling heat exchanger of a cascade evaporative cooling heat pump module unit for Embodiment 1;

[0033] Figure 4 Schematic view of the heat exchange plate of the evaporative cooling heat exchanger of a cascade evaporative cooling heat pump module unit for Embodiment 1;

[0034] Figure 5 Schematic view of the internal structure of the heat exchange plate of the evaporative cooling heat exchanger of a cascade evaporative cooling heat pump module unit for Embodiment 1;

[0035] Figure 6 Schematic cross-sectional view of the uppermost heat exchange unit of the heat exchange plate of the evaporative cooling heat exchanger of a cascade evaporative cooling heat pump module unit for Embodiment 1;

[0036] Figure 7 Schematic cross-sectional view of two adjacent heat exchange units of the heat exchange plate of the evaporative cooling heat exchanger of a cascade evaporative cooling heat pump module unit for Embodiment 1;

[0037] Figure 8 Schematic cross-sectional view of two adjacent heat exchange units of the heat exchange plate of the evaporative cooling heat exchanger of a cascade evaporative cooling heat pump module unit for Embodiment 2;

[0038] Figure 9 Schematic cross-sectional view of two adjacent heat exchange units of the heat exchange plate of the evaporative cooling heat exchanger of a cascade evaporative cooling heat pump module unit for Embodiment 3;

[0039] Figure 10 Schematic cross-sectional view of two adjacent heat exchange units of the heat exchange plate of the evaporative cooling heat exchanger of a cascade evaporative cooling heat pump module unit for Embodiment 4;

[0040] Figure 11 Schematic view of a cascade evaporative cooling heat pump module unit for Embodiment 5;

[0041] Figure 12 Schematic view of the refrigerant operation assembly of a cascade evaporative cooling heat pump module unit for Embodiment 5. Detailed implementation manners

[0042] To deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with the drawings and embodiments. The embodiments are only used to explain the present invention and do not limit the protection scope of the present invention.

[0043] Embodiment 1

[0044] As Figures 1 to 7As shown in the figure, this embodiment provides a cascade evaporative cooling heat pump modular unit, which includes an evaporative cooling heat exchanger 2, an air-cooled heat exchanger 3, and a refrigerant operation assembly 6; the evaporative cooling heat exchanger 2 and the air-cooled heat exchanger 3 are connected to the refrigerant operation assembly 6 in parallel; the refrigerant operation assembly 6 is used to operate the refrigerant to exchange heat in the evaporative cooling heat exchanger 2 or the air-cooled heat exchanger 3; the evaporative cooling heat exchanger 2 includes a plurality of heat exchange plates; the plurality of heat exchange plates are arranged at intervals along a direction perpendicular to the evaporation heat exchange surface; each heat exchange plate includes at least one heat exchange unit; the heat exchange unit is formed by horizontally arranging a plurality of horizontal sections 205 of condensing tubes in a plate-like structure, and both ends of the plurality of horizontal sections 205 of condensing tubes are connected by condensing tube bending sections 214 to form at least one refrigerant heat exchange channel, and both sides of the plate-like structure form an evaporation heat exchange surface; there is no gap connection between adjacent two of the plurality of horizontal sections 205 of condensing tubes vertically arranged in the plate-like structure (that is, the minimum distance is maintained between adjacent heat exchange tubes), so that the evaporation heat exchange surface is continuous and has an uneven shape; a bracket 206 is further arranged between the cooling outer tube 203 and the horizontal section 205 of the condensing tube in the water distribution tank 1; a cooling outer tube 203 is further arranged above the uppermost horizontal section 205 of the condensing tube; a water distribution tank 201 is further arranged between the cooling outer tube 203 and the uppermost horizontal section 205 of the condensing tube; water distribution microporous plates 202 are arranged on both sides of the water distribution tank 201; the upper end of the water distribution microporous plate 202 is connected to the tube wall of the cooling outer tube 203, and the lower end is connected to the tube wall of the uppermost horizontal section 205 of the condensing tube, so that the water distribution tank 201 is fixed between the cooling outer tube 203 and the heat exchange unit in an embedded manner to form an integral structure; the cooling outer tube 203 is provided with a number of water outlet holes 204 communicating with the water distribution tank 201 for uniformly injecting water into the water distribution tank 201; the water distribution tank 201 is used to evenly distribute the water injected by the cooling outer tube 203 through the water distribution microporous plates on the evaporation heat exchange plate surface to form a water curtain to exchange heat with the refrigerant outside the refrigerant heat exchange channel; a cooling inner tube 207 is further arranged in the refrigerant heat exchange channel for the water passing through the cooling inner tube 207 to exchange heat with the refrigerant inside the refrigerant heat exchange channel.

[0045] In a cascade evaporative cooling heat pump modular unit of this embodiment, in the evaporative cooling heat exchanger 2 used, the inner sleeve single-tube S-shaped coiling method is adopted, and the centers of the cross-sections of the straight pipe sections are on the same straight line (vertically arranged), and the minimum distance is maintained between adjacent heat exchange pipes, forming an integral heat exchange plane including straight pipe sections and bent pipe sections, that is, the plate surface structure. At the uppermost end of the heat exchanger plate surface, a cooling outer pipe parallel to the heat exchange pipes and with the same pipe diameter is provided, and dense water outlet holes are provided at the lower end of the cooling outer pipe wall. A certain distance is maintained between the cooling outer pipe and the heat exchange pipes, and a water distribution micro-porous plate is fixed along the tangential direction of the outer walls of the cooling outer pipe and the heat exchange pipes between the two pipes to form a water distribution tank, and sealing plates are provided at both ends of the water distribution tank; the water distribution tank forms an invisible water distributor integrated with the entire heat exchange surface composed of the cooling outer pipe, the adjacent condensing pipes and the water distribution micro-porous plate. The water distribution tank and the heat exchange pipes arranged in sequence at the lower end of the water distribution tank form a heat exchange unit. Through this design, a refrigerant heat exchange channel is formed between the inner wall of the condensing pipe and the outer wall of the cooling inner pipe, a first heat exchange channel for cooling water is formed inside the cooling inner pipe, and the heat exchange plate surface where the outer wall of the condensing pipe is located forms a second heat exchange channel for the evaporation of cooling water; the refrigerant heat exchange channel has two heat exchange surfaces, one inside and one outside.

[0046] In a cascade evaporative cooling heat pump modular unit of this embodiment, the evaporative cooling heat exchanger 2 is divided into two heat exchange processes: the first heat exchange process is the heat transfer heat exchange process between water and refrigerant, which is a traditional shell-and-tube convective heat exchange process, and the heat is transferred to the refrigerant medium outside its outer wall through the pipe wall of the cooling inner pipe in a closed space; the second heat exchange process is the evaporative cooling heat exchange process. The cooling water heated up through the first heat exchange process enters the cooling outer pipe, overflows through the water distribution tank and is evenly distributed on the entire heat exchange surface. The refrigerant in the pipe transfers heat to the cooling water through the heat exchange plate surface, and the cooling water evaporates to generate supersaturated steam, which is discharged into the atmosphere under the action of the fan. This heat exchange is the evaporative cooling heat exchange method, and the entire heat exchange process is carried out in an open space under normal pressure. The refrigerant can be fully condensed by exchanging heat with the cooling water outside and inside the pipe at the same time.

[0047] In a cascade evaporative cooling heat pump modular unit of this embodiment, in the evaporative cooling heat exchanger 2 used, the cooling outer pipe, the adjacent condensing pipes with a set distance, and the water distribution microporous plate that is vertically tangent to the outer walls of two adjacent pipes form an embedded and hidden water distribution tank. When the cooling water is delivered to the cooling outer pipe, since there are multiple rows of water outlet holes distributed on the cooling outer pipe, the cooling water is evenly sprayed into the entire water distribution tank. The air pressure inside the water distribution tank is equal to the external atmospheric pressure, and the cooling water maintains an equal pressure state under the dual action of its own gravity and atmospheric pressure; the cooling water can flow down under its own gravity and is evenly distributed on the evaporation heat transfer surface through the water distribution microporous plate, forming a thin water curtain (water film) from top to bottom. Due to the surface tension of water, the cooling water adheres to the entire evaporation heat transfer surface without gaps, continuously, and directly. The water film fully extends, is thin and uniform, thereby improving the evaporation efficiency; and there will be no free water existing, which can maximally avoid the phenomena of water splashing and water drifting.

[0048] In a cascade evaporative cooling heat pump modular unit of this embodiment, the processing method of the water distribution tank 201 of the evaporative cooling heat exchanger 2 used is as follows: directly weld the water distribution microporous plate between the arranged cooling outer pipes and condensing pipes, and seal the two ends in the length direction of the water distribution tank with sealing plates to form an integral structure. The water distribution microporous plate has a certain resistance to water flow, which can make the water form a certain water level in the water distribution tank. The water distribution microporous plate can also be a sieve mesh or a nano-level mesh, as long as the water distribution tank can maintain a certain water level; the material of the water distribution microporous plate can be copper, aluminum, stainless steel, alloy, or other metal materials that are convenient for making meshes or holes; control the water inlet volume of the cooling outer pipe to control the water level in the water distribution tank. On the premise of ensuring sufficient water spraying at the bottom end of the heat exchange unit, minimize the supply of cooling water without surplus to achieve the purpose of precise water distribution; and because the cooling water exchanges heat with the refrigerant twice, the heat transfer capacity of the cooling water is greatly improved, thereby reducing the cooling water circulation volume, which is beneficial to reducing the volume of the water tank for supplying cooling water and facilitating the miniaturization of the unit using this heat exchanger.

[0049] In a cascade evaporative cooling heat pump modular unit of this embodiment, in the evaporative cooling heat exchanger 2 used, the outer wall of the condensing pipe constitutes a complete and continuous heat transfer surface. The M-shaped concave and convex alternating curved surface structure (concave and convex undulating shape) formed on the outer wall of the condensing pipe increases the heat transfer area and has a higher heat transfer amount; the M-shaped concave and convex alternating curved surface can extend the drainage time of the cooling water on the plate surface. The flow rate and flow direction of the cooling water continuously change between the concave and convex surfaces, and the appearance of turbulence constitutes a disturbance effect on the cooling water film, increasing the heat transfer coefficient of the evaporation surface and improving the heat transfer efficiency; this enables the volume of the evaporative cooling heat exchanger in the unit to be smaller under the condition of the same heat transfer amount, and correspondingly greatly reduces the overall volume of the unit, achieving the purpose of miniaturization.

[0050] In a cascade evaporative cooling heat pump module unit of this embodiment, in the evaporative cooling heat exchanger, a plurality of heat exchange plates are arranged at intervals along a direction perpendicular to the evaporative heat exchange surface. Enough gaps are maintained between the heat exchange plates to form a channel convenient for air circulation, and it is also convenient for cleaning and maintenance.

[0051] In a cascade evaporative cooling heat pump module unit of this embodiment, based on the evaporative cooling heat exchanger, an air-cooled heat exchanger is installed in parallel with the evaporative cooling heat exchanger, realizing the heat pump heating function of a water-cooled (evaporative cooling) chiller, changing the status quo that traditional water-cooled chillers can only refrigerate but not heat, and expanding the use functions of water-cooled chillers.

[0052] In a cascade evaporative cooling heat pump module unit of this embodiment, in the adopted evaporative cooling heat exchanger, the heat exchange plate includes a plurality of heat exchange units as described in Embodiment 1; the plurality of heat exchange units are arranged vertically, and two adjacent heat exchange units are connected by a bent section 214 of the condensation pipe, so that their respective refrigerant heat exchange channels are correspondingly connected. The outer diameter of the cooling outer pipe 203 between two adjacent heat exchange units is the same as the outer diameter of the condensation pipe. The connection modes of the cooling outer pipe 203, the water distribution tank 201, and the water distribution microporous plate 202 are set in the same way as the aforementioned water distribution tank connection modes; in addition, the top of the cooling outer pipe 203 in the heat exchange unit located on the lower side among two adjacent heat exchange units is connected to the bottom of the horizontal section 205 of the condensation pipe at the lowermost side of the heat exchange unit located on the upper side; a plurality of the brackets 206 are arranged at intervals between the bottom of the cooling outer pipe 203 and the top of the horizontal section 205 of the condensation pipe at the uppermost side of the heat exchange unit to which it belongs.

[0053] In a cascade evaporative cooling heat pump module unit of this embodiment, a segmented design of a plurality of heat exchange units is adopted. The water distribution tank divides each heat exchange plate into a plurality of heat exchange units for independent evaporative cooling. Each heat exchange unit only needs to ensure the minimum water spray amount of this unit, making the water film on the condensation heat exchange surface thin enough to facilitate the vaporization and evaporation of the cooling water; the segmented spray unit design not only maintains the integrity of the water film on the entire plate surface, but also ensures the least water spray and the thinnest water film for each heat exchange unit.

[0054] In a cascade evaporative cooling heat pump modular unit of this embodiment, in two adjacent heat exchange units, the number of horizontal sections 205 of the condensing pipes in the lower heat exchange unit is less than that in the upper heat exchange unit, so as to make the heat exchange areas of the evaporation heat exchange surfaces of multiple heat exchange units decrease from top to bottom; the number of water outlet holes 204 of the cooling outer pipes 203 in the lower heat exchange unit is less than that of the water outlet holes 204 of the cooling outer pipes 203 in the upper heat exchange unit (the spacing of the water outlet holes along the length direction of the cooling outer pipes is increased), so as to meet the water distribution requirements of the evaporation heat exchange surfaces corresponding to the heat exchange areas. Since the refrigerant cools down layer by layer from top to bottom in the refrigerant condensation channel, the upper side is the high-temperature area with a large evaporation amount, and the area of the evaporation heat exchange surface on the upper side is also set relatively large and sufficient water is provided; while the lower side is the low-temperature area with a relatively reduced evaporation amount, it is necessary to correspondingly reduce the area of the evaporation heat exchange surface and reduce the water distribution amount (gradually reduce the number of holes in the cooling outer pipes layer by layer); this decreasing design method can make full use of the advantages of the segmented design, that is, it can ensure sufficient water distribution for the corresponding heat exchange unit and ensure the minimum water distribution amount of the heat exchange unit, preventing the unvaporized cooling water in the upper heat exchange unit from accumulating in the lower heat exchange unit; ensuring that the water film of each heat exchange unit is uniform and thin, and saving water more.

[0055] In a cascade evaporative cooling heat pump modular unit of this embodiment, a refrigerant vapor inlet is provided at the top end of the refrigerant heat exchange channel of the heat exchange plate, and a refrigerant liquid outlet is provided at the bottom end; an external cooling water inlet is provided at one end of the cooling outer pipe 203 of the heat exchange plate; both ends of the cooling inner pipe 207 penetrate out of the refrigerant heat exchange channel, and an internal cooling water inlet is provided at its bottom end and an internal cooling water outlet is provided at its top end; the refrigerant vapor inlet is connected to a first refrigerant vapor main pipe 208, the refrigerant liquid outlet is connected to a first refrigerant liquid main pipe 210, and the external cooling water inlet of the cooling outer pipe 203 is connected to an external cooling water distribution pipe 209; the external cooling water distribution pipe 209 is also connected to a cooling auxiliary pipe 211; the internal cooling water inlet of the cooling inner pipe 207 is connected to a cooling main pipe 212, and the internal cooling water outlet is connected to an internal cooling water collecting pipe 213; the internal cooling water collecting pipe 213 is communicated with the cooling auxiliary pipe 211.

[0056] In a cascade evaporative cooling heat pump modular unit of this embodiment, the air-cooled heat exchanger 3 is connected to a second refrigerant vapor main pipe 301 and a second refrigerant liquid main pipe 302; the first refrigerant vapor main pipe 208 and the second refrigerant vapor main pipe 301 are connected in parallel and then connected to the refrigerant operation assembly 6, and the first refrigerant liquid main pipe 210 and the second refrigerant liquid main pipe 302 are connected in parallel and then connected to the refrigerant operation assembly 6; a first solenoid valve 603 is provided on the first refrigerant vapor main pipe 208, and a second solenoid valve 604 is provided on the second refrigerant vapor main pipe 301.

[0057] In a cascade evaporative cooling heat pump module unit of this embodiment, the unit further includes a water tank 5; a water pump 501 is arranged in the water tank 5; the water outlet end of the water pump 501 is communicated with the cooling main pipe 212, and is used to send the cooling water in the water tank 5 into the evaporative cooling heat exchanger 2 through the cooling main pipe 212; the water tank 5 is further provided with a water replenishing port 502; the bottom of the water tank 5 is further connected with a sewage discharge pipe 503; a sewage discharge solenoid valve 504 is arranged on the sewage discharge pipe 503; a cooling filler layer 4 is further arranged between the evaporative cooling heat exchanger 2 and the water tank 5, and is used to cool the unevaporated water dripping from the evaporative cooling heat exchanger 2 and then discharge it into the water tank 5.

[0058] In a cascade evaporative cooling heat pump module unit of this embodiment, the refrigerant operation assembly 6 includes a compressor 601, a four-way valve 602, a first solenoid valve 603, a second solenoid valve 604, a first check valve 605, a liquid storage tank 606, a drying filter 607, an economizer 608, a first expansion valve 609, a second check valve 610, a gas-liquid separator 611, a third solenoid valve 612, a second expansion valve 613, a third check valve 614, a fourth check valve 615; the unit further includes a multi-connected indoor unit 12 (fluorine machine); the compressor 601 has an air outlet, a suction port and an enthalpy-increasing port; the four-way valve 602 has an a end, a b end, a c end, a d end; the economizer 608 has an e end, an f end, a g end, an h end, the e end and the f end are communicated inside the economizer 608, and the g end and the h end are communicated inside the economizer 608; the multi-connected indoor unit 12 has a j end and a k end, and the j end and the k end are two ports of the refrigerant channel of the multi-connected indoor unit.

[0059] The air outlet of the compressor 601, the a end and the b end of the four-way valve 602, the pipeline in parallel with the first refrigerant vapor main pipe 208 / second refrigerant vapor main pipe 301, the first refrigerant vapor main pipe 208 of the evaporative cooling heat exchanger 2 and the first solenoid valve 603 are communicated with the first refrigerant liquid main pipe 210, the first check valve 605, the liquid storage tank 606, the drying filter 607, the h end and the g end of the economizer, the first expansion valve 609, the second check valve 610, the j end and the k end of the multi-connected indoor unit 12, the d end and the c end of the four-way valve, the gas-liquid separator 611, and the suction port of the compressor 601 to form a first refrigeration operation channel.

[0060] The outlet of the compressor 601, the a and b ends of the four-way valve 602, the pipeline in parallel with the first refrigerant vapor main pipe 208 / second refrigerant vapor main pipe 301, the second refrigerant vapor main pipe 301 of the air-cooled heat exchanger 3, and the second solenoid valve 604 are connected in sequence with the second refrigerant liquid main pipe 302, the first check valve 605, the liquid storage tank 606, the dryer filter 607, the h and g ends of the economizer, the first expansion valve 609, the second check valve 610, the j and k ends of the multi-connected indoor unit 12, the d and c ends of the four-way valve, the gas-liquid separator 611, and the suction port of the compressor 601 to form a second refrigeration operation channel;

[0061] The outlet of the compressor 601, the a and d ends of the four-way valve 602, the k and j ends of the multi-connected indoor unit 12, the third check valve 614, the liquid storage tank 606, the dryer filter 607, the h and g ends of the economizer, the first expansion valve 609, the fourth check valve 615, the pipeline in parallel with the first refrigerant liquid main pipe 210 / second refrigerant liquid main pipe 302, the first refrigerant liquid main pipe 210 of the evaporative cooling heat exchanger 2 and the first refrigerant vapor main pipe 208 and the first solenoid valve 603, the b and c ends of the four-way valve 602 / gas-liquid separator 611, and the suction port of the compressor 601 are connected in sequence to form a first heating operation channel;

[0062] The outlet of the compressor 601, the a and d ends of the four-way valve 602, the k and j ends of the multi-connected indoor unit 12, the third check valve 614, the liquid storage tank 606, the dryer filter 607, the h and g ends of the economizer, the first expansion valve 609, the fourth check valve 615, the pipeline in parallel with the first refrigerant liquid main pipe 210 / second refrigerant liquid main pipe 302, the second refrigerant liquid main pipe 302 of the air-cooled heat exchanger 3 and the second refrigerant vapor main pipe 301 and the second solenoid valve 604, the b and c ends of the four-way valve 602, the gas-liquid separator 611, and the suction port of the compressor 601 are connected in sequence to form a second heating operation channel;

[0063] In the first heating operation channel and the second heating operation channel, the outlet of the dryer filter 607, the second expansion valve 613, the e and f ends of the economizer, the third solenoid valve 612, and the enthalpy-increasing port of the compressor 601 are connected in sequence to form an auxiliary enthalpy-increasing loop; the internal channel between the e and f ends in the economizer exchanges heat with the internal channel between the h and g ends.

[0064] In a cascade evaporative cooling heat pump modular unit of this embodiment, the unit further includes a casing 1, and a ventilation opening 11 is provided at the top of the casing 1; a fan 7 is arranged in the ventilation opening 11; the evaporative cooling heat exchanger 2 and the cooling packing layer 4 are successively arranged below the fan 7; the air-cooled heat exchanger 3 is arranged outside the evaporative cooling heat exchanger 2; the water tank 5 is arranged below the evaporative cooling heat exchanger 2 and the air-cooled heat exchanger 3, and an air grille 9 is further provided on the side wall of the casing 1 corresponding to the air-cooled heat exchanger 3; a water separation plate 8 is further arranged between the fan 7 and the evaporative cooling heat exchanger 2; an equipment room is arranged below the water tank 5 inside the casing 1, the refrigerant operation assembly 6 is installed in the equipment room, and an electric control box 10 is further arranged in the equipment room for controlling the fan 7, the water pump 501, the compressor 601, the four-way valve 602, the first solenoid valve 603, the second solenoid valve 604 and the third solenoid valve 612.

[0065] In a cascade evaporative cooling heat pump modular unit of this embodiment, the adopted evaporative cooling heat exchanger, through the integrated, water curtain and cascade design, improves the evaporation amount of the cooling water, reduces the cooling water circulation amount, and further reduces the power consumption of the cooling circulation pump. The segmented design and the stepped unit water distribution method make the water distribution more delicate, and only a small flow rate of cooling water circulation can meet the cooling function; the embedded hidden water distribution tank realizes the water curtain type water distribution, eliminates the existence of free water, and does not generate splashing water; the reduction of the cooling water circulation amount reduces the air volume and wind speed of the fan, and can avoid the occurrence of "splashing water" and "drifting water" phenomena to the greatest extent, saves water, and the reduction of the cooling water circulation amount also reduces the volume of the cooling water tank, reducing the volume of the unit; making the heat exchange efficiency of the unit higher and the body smaller, realizing the miniaturization of the unit.

[0066] In a cascade evaporative cooling heat pump modular unit of this embodiment, the screw or centrifugal compressor is replaced with a scroll compressor or a small-power screw compressor, and the entire refrigerant circulation system of the unit is built into a cooling tower matched with the unit, forming an integrated unit with a highly integrated heat exchange system and a cooling system, realizing the miniaturization and modularization of the unit (the power consumption is 5KW - 40KW); after modularization, the floor area of a single unit is 2 - 3㎡, and the weight is reduced to about 0.5T, which is convenient for the installation and transportation of the unit.

[0067] In a cascade evaporative cooling heat pump modular unit of this embodiment, the integrated unit eliminates the laying of cooling pipe networks in traditional chiller projects, reducing the construction volume and the construction difficulty; the head of the built-in cooling water circulation system is close to "0", and the power of the cooling circulation pump is lower; an open heat exchange method is adopted, using the self-gravity flow of water to exchange heat with the refrigerant, further reducing the power of the circulation pump; and the embedded water curtain type water distribution is noise-free. Due to the high heat exchange efficiency, a small compressor is used for the compressor, reducing the noise source intensity. The reduction of the cooling water circulation volume reduces the fan power, and the power of the cooling circulation pump is also effectively reduced, further reducing the generated noise; overall, the noise pollution degree is reduced and improved; the unit noise can be controlled below 65 Pb, fully meeting the specification standards, thus solving the problem of noise pollution.

[0068] In a cascade evaporative cooling heat pump modular unit of this embodiment, heat pump technology is integrated. An air-cooled heat exchanger is added to the evaporative cooling heat exchanger, and through the shared refrigerant cycle and other components, the unit realizes the air-cooled heat pump heating function, achieving the purpose of dual use of one machine.

[0069] In a cascade evaporative cooling heat pump modular unit of this embodiment, a scroll compressor or a small-power screw compressor can be used for the compressor. The single-unit weight is reduced to less than 0.5 tons, realizing the miniaturization and modularization of the unit, which is convenient for the installation and transportation of the unit; the small modular unit can be installed on the roof of the building without a dedicated machine room, thus saving indoor space; multiple small modular units of this unit operate simultaneously as backups for each other, and the repair and maintenance of individual units do not affect the overall operation and use, improving the operation stability of the entire air conditioning system.

[0070] In a cascade evaporative cooling heat pump modular unit of this embodiment, the working principle of the evaporative cooling heat exchanger adopted is as follows: Cooling water enters from the inner cooling water inlet of the cooling inner pipe through the cooling main pipe and flows upward in the cooling inner pipe. Refrigerant vapor enters from the refrigerant vapor inlet and flows downward in the refrigerant heat exchange channel from top to bottom, constituting the first heat exchange of the cooling water. The temperature of the refrigerant gradually decreases during the downward flow, and the temperature of the cooling water gradually increases during the upward movement. The cooling water flows out from the inner cooling water outlet, enters the inner cooling water outlet collecting pipe, then enters the cooling auxiliary pipe, and is then introduced into the outer cooling water inlet distributing pipe and enters the cooling outer pipe from the outer cooling water inlet. Then, it enters the water distribution tank through the water outlet holes of the cooling outer pipe. Since there are multiple rows of water outlet holes in the cooling pipe, the cooling water is evenly sprayed throughout the water distribution tank. The air pressure in the water distribution tank is equal to the external atmospheric pressure, and the cooling water maintains an equal pressure state under the dual action of its own gravity and atmospheric pressure; the cooling water can flow down by its own gravity and be evenly distributed on the evaporation heat exchange plate surface through the water distribution network, forming a thin water film (water curtain) from top to bottom. After the second heat exchange with the refrigerant in the refrigerant heat exchange channel, the cooling water vaporizes and evaporates, taking away more heat, and the temperature of the refrigerant in the pipe further decreases; the cooling water absorbs heat and vaporizes and evaporates on the surface of the condenser, and the saturated steam formed by evaporation is discharged into the atmosphere under the action of the fan; the unevaporated cooling water is heated up after convective heat exchange with the refrigerant vapor in the condensing pipe, and drips along both sides of the heat exchange surface to the bottom of the heat exchange surface and then drops into the cooling filler arranged at the lower part of the evaporative condenser under the state of its own gravity flow. At this time, the evaporative condenser acts as the water distribution function during the cooling and condensation process of the cooling water. The cooling water dripping evenly along the bottom of the entire evaporative condenser drops onto the top of the cooling filler below it. When the cooling water flows downward, a very thin water film is formed again on the surface of the cooling filler. Similarly, under the action of the fan, the water film of the cooling water on the surface of the filler exchanges heat with the ambient air passing over the surface of the filler. The cooling water is cooled and its temperature drops, and the air is heated up and discharged into the atmosphere through the fan. At this time, the filler acts as the cooling function. The cooled cooling water drops evenly onto the surface of the entire cooling water tank along the horizontal lower surface of the entire cooling filler. Under the action of the water pump, the cooling water at a lower temperature moves downward, and then enters the cooling inner pipe of each heat exchange unit through the cooling main pipe to enter the next cooling cycle.

[0071] In a cascade evaporative cooling heat pump modular unit of this embodiment, it includes the refrigeration mode of the evaporative cooling heat exchanger, the refrigeration mode of the air-cooled heat exchanger, the defrosting mode of the air-cooled heat exchanger, the heating mode of the air-cooled heat exchanger, and the heating mode of the evaporative cooling heat exchanger. The specific mode flow is as follows:

[0072] I. Refrigeration mode of the evaporative cooling heat exchanger

[0073] In this mode, the water replenishing port of the water tank is switched to the cooling water interface.

[0074] Refrigerant flow: The second solenoid valve and the third solenoid valve are closed, the first solenoid valve is opened, and the a end of the four-way valve is connected to the b end, and the c end is connected to the d end; the compressor is powered on, and the high-temperature and high-pressure refrigerant vapor is ejected from the compressor outlet, enters through the a end of the four-way valve and exits through the b end, passes through the first solenoid valve and the first refrigerant steam main pipe into each heat exchange unit of the evaporative heat exchanger, and the refrigerant vapor exchanges heat with the water in the cooling inner tube and the water curtain formed by the cooling outer tube for cooling; the cooling water in the water curtain exchanges heat with the refrigerant vapor in the evaporative heat exchanger, and the temperature is vaporized and evaporated, and part of the cooling water changes from liquid to gas, and is discharged to the outdoor atmosphere through the fan in the form of water vaporization latent heat; it is condensed by the evaporative heat exchanger The liquefied low-temperature and high-pressure liquid refrigerant passes through the first refrigerant liquid main pipe and then enters the liquid storage tank through the first one-way valve. The low-temperature and high-pressure liquid refrigerant continues to pass through the drying filter and then enters the h end and exits the g end of the economizer. It is throttled and reduced in pressure by the first expansion valve to reduce the refrigerant pressure and temperature. The throttled low-temperature and low-pressure liquid refrigerant enters the j end and exits the k end of the multi-split indoor unit through the second one-way valve and exchanges heat with the indoor air in the refrigerant channel of the multi-split indoor unit. The low-temperature and low-pressure liquid refrigerant absorbs heat and vaporizes to become refrigerant vapor. The refrigerant vapor then enters the d end and exits the c end of the four-way valve, passes through the gas-liquid separator and enters the return air port of the compressor for compression, completing a refrigerant circulation process.

[0075] In this mode, the water pump starts first with the compressor, and the fan starts after the set time interval; the cooling water with a lower temperature in the water tank enters the cooling inner tube of each heat exchange unit of the evaporative heat exchanger through the cooling main pipe under the action of the water pump. After the cooling inner tube exchanges heat with the refrigerant steam, it enters the cooling sub-pipe, and then enters the cooling outer tube of each heat exchange unit of the evaporative heat exchanger. After that, it passes through the water distribution trough of each heat exchange unit and is evenly distributed on the surface of each heat exchange plate to form a layer of water film. Since the surface temperature of each heat exchange plate is about 90℃, the cooling water heats up and evaporates quickly, thereby directly taking away a large amount of heat from the refrigerant. The cooling water that is not vaporized exchanges heat with each heat exchange plate and then drips onto the cooling filler below after heating. At the top of the material layer, cooling water forms a thin water film from top to bottom along the surface of the cooling packing layer under the action of gravity. Since the temperature of the cooling water is higher than the ambient temperature, the water vapor on the surface of the water film is in a supersaturated state and forms atomization. The atomized water vapor is discharged under the action of the fan and transferred to the atmosphere in the form of latent heat; the unvaporized higher temperature cooling water conducts convection heat exchange with the cooling packing layer and radiation heat exchange with the air; as the cooling water sinks along the cooling packing layer, the temperature gradually decreases, and eventually all the heat is discharged into the atmosphere through the fan; the lower temperature cooling water after cooling drips evenly along the bottom surface of the cooling packing layer to the upper surface of the cooling water tank, completing a water circulation process.

[0076] 2. Cooling mode of air-cooled heat exchanger

[0077] Refrigerant flow: The first solenoid valve and the third solenoid valve are closed, the second solenoid valve is opened, the a-end and the b-end of the four-way valve are connected, and the c-end and the d-end are connected; the compressor is powered on and operates. The high-temperature and high-pressure refrigerant vapor is ejected from the outlet of the compressor, enters through the a-end of the four-way valve and exits through the b-end, then passes through the second solenoid valve and enters the air-cooled heat exchanger through the second refrigerant vapor main pipe. The high-temperature and high-pressure refrigerant vapor exchanges heat with the circulating air flowing through the surface of the air-cooled heat exchanger. The refrigerant vapor is cooled, liquefied and its temperature drops. The hot air after heat exchange and temperature rise is discharged to the outdoor atmosphere through the fan; the condensed low-temperature and high-pressure liquid refrigerant passes through the second refrigerant liquid main pipe, then through the first check valve and enters the liquid storage tank. The low-temperature and high-pressure liquid refrigerant continues to pass through the dryer filter, then enters through the h-end of the economizer and exits through the g-end, and then the refrigerant pressure and temperature are reduced by throttling through the first expansion valve; the throttled low-temperature and low-pressure liquid refrigerant enters through the j-end of the multi-connected indoor unit through the second check valve and exits through the k-end, and exchanges heat with the indoor air in the refrigerant channel in the multi-connected indoor unit. The low-temperature and low-pressure liquid refrigerant absorbs heat and vaporizes into refrigerant vapor. The refrigerant vapor then enters through the d-end of the four-way valve and exits through the c-end, enters the suction port of the compressor after passing through the gas-liquid separator, and is compressed to complete a refrigerant cycle process.

[0078] In this mode, the water pump is closed, the fan starts prior to the compressor, and the evaporative cooling heat exchanger is in the standby state; due to the action of the fan, the inside of the unit is in a negative pressure state, and the ambient air enters the unit through the air grille, exchanges heat with the air-cooled heat exchanger, the refrigerant is cooled, liquefied and its temperature drops, the air is heated and takes away the heat of the refrigerant, and is discharged through the discharge port and transferred to the atmosphere.

[0079] III. Defrosting mode of the air-cooled heat exchanger

[0080] Refrigerant flow: The first solenoid valve and the third solenoid valve are closed, and the second solenoid valve is opened. The a end and the b end of the four-way valve are connected, and the c end and the d end are connected. The compressor is powered on and operates. The high-temperature and high-pressure refrigerant vapor is ejected from the outlet of the compressor, enters through the a end of the four-way valve and exits through the b end, then passes through the second solenoid valve and enters the air-cooled heat exchanger through the second refrigerant vapor main pipe. The refrigerant vapor exchanges heat with the ice (frost) on the surface of the air-cooled heat exchanger. The refrigerant vapor is cooled, liquefied, and the temperature drops. The ice (frost) exchanges heat with the refrigerant vapor in the air-cooled heat exchanger, warms up, and part of it becomes vapor and diffuses into the outdoor atmosphere through natural air flow. Most of the ice melts into water and flows back to the cooling water tank. The condensed low-temperature and high-pressure liquid refrigerant passes through the second refrigerant liquid main pipe, then through the first check valve and enters the liquid storage tank. The low-temperature and high-pressure liquid refrigerant continues to pass through the drying filter, then enters through the h end of the economizer and exits through the g end, and then passes through the first expansion valve to throttle and reduce the refrigerant pressure and temperature. The throttled low-temperature and low-pressure liquid refrigerant enters through the j end of the multi-connected indoor unit through the second check valve, exits through the k end, and exchanges heat with the indoor air in the refrigerant channel in the multi-connected indoor unit. The low-temperature and low-pressure liquid refrigerant absorbs heat and vaporizes into refrigerant vapor. The refrigerant vapor then enters through the d end of the four-way valve and exits through the c end, passes through the gas-liquid separator, enters the suction port of the compressor, and is compressed to complete a refrigerant cycle process. When the ambient temperature is relatively low, the third solenoid valve is opened. Part of the low-temperature and high-pressure refrigerant liquid after passing through the drying filter passes through the second expansion valve, enters through the e end of the economizer and exits through the f end. This part of the refrigerant liquid absorbs heat and vaporizes by exchanging heat with the refrigerant liquid entering through the h end and exiting through the g end of the economizer. The refrigerant vapor returns to the enthalpy increase port of the compressor after passing through the third solenoid valve.

[0081] In this mode, the water pump is closed and the fan is closed. The evaporative cooling heat exchanger is in the standby state.

[0082] IV. Heating mode of the air-cooled heat exchanger

[0083] Refrigerant flow: The first solenoid valve and the third solenoid valve are closed, and the second solenoid valve is opened. The a end and the d end of the four-way valve are connected, and the b end and the c end are connected. The compressor is powered on and operates. The high-temperature and high-pressure refrigerant vapor enters through the a end of the four-way valve and exits through the d end, then enters through the k end and exits through the j end of the multi-connected indoor unit, and exchanges heat with the indoor air in the refrigerant channel inside the multi-connected indoor unit. The high-temperature and high-pressure liquid refrigerant condenses into a medium-temperature and medium-pressure liquid refrigerant after heat exchange. The liquid refrigerant then enters the liquid storage tank after passing through the third check valve. The medium-temperature and medium-pressure liquid refrigerant continues to be divided into two paths after passing through the dryer filter: The first path enters through the h end and exits through the g end of the economizer, and the second path passes through the second expansion valve for throttling and pressure reduction and then enters through the e end and exits through the f end of the economizer. The two paths of refrigerant exchange heat in the economizer. The medium-temperature and medium-pressure liquid refrigerant in the first path is further condensed and cooled in the economizer, and then throttled and depressurized by the first expansion valve to form a low-temperature and low-pressure liquid refrigerant. The low-temperature and low-pressure liquid refrigerant enters the air-cooled heat exchanger through the fourth check valve and the second refrigerant liquid main pipe. The low-temperature and low-pressure liquid refrigerant exchanges heat with the circulating air flowing through the surface of this heat exchanger. The liquid refrigerant is heated and vaporized into refrigerant vapor, and then enters through the b end and exits through the c end of the four-way valve after passing through the second refrigerant vapor main pipe and the second solenoid valve, and then enters the suction port of the compressor after passing through the gas-liquid separator and is compressed, completing a main refrigerant cycle process. The medium-temperature and medium-pressure liquid refrigerant in the second path is throttled and depressurized by the second expansion valve and further heated and vaporized in the economizer to form a medium-temperature and low-pressure steam. The medium-temperature and low-pressure steam returns to the enthalpy-increasing port of the compressor after passing through the third solenoid valve, completing an auxiliary enthalpy-increasing cycle.

[0084] In this mode, the water pump is closed, the fan starts prior to the compressor, and the evaporative cooling heat exchanger is in the standby state. Due to the action of the fan, the inside of the unit is in a negative pressure state. The ambient air enters the unit through the air grille, exchanges heat with the air-cooled heat exchanger, the refrigerant liquid is vaporized and heated, and the air releases heat and cools down, and is discharged through the discharge port and transferred to the atmosphere, realizing the heat pump heating function of the air-cooled heat exchanger.

[0085] V. Heating mode of the evaporative cooling heat exchanger

[0086] In this mode, the water replenishment port of the water tank is switched to the industrial waste heat and wastewater interface.

[0087] Refrigerant Flow: The second solenoid valve and the third solenoid valve are closed, and the first solenoid valve is open. The a-end and the d-end of the four-way valve are connected, and the b-end and the c-end are connected. The compressor is powered on and operates. The high-temperature and high-pressure refrigerant vapor enters through the a-end of the four-way valve, exits through the d-end, then enters through the k-end of the multi-connected indoor unit, exits through the j-end, and exchanges heat with the indoor air in the refrigerant passage of the multi-connected indoor unit. The high-temperature and high-pressure liquid refrigerant condenses into a medium-temperature and medium-pressure liquid refrigerant after heat exchange. The liquid refrigerant then enters the liquid storage tank after passing through the third check valve. The medium-temperature and medium-pressure liquid refrigerant continues to be divided into two paths after passing through the dryer filter: The first path enters through the h-end of the economizer and exits through the g-end, and the second path is throttled and depressurized by the second expansion valve and then enters through the e-end of the economizer and exits through the f-end. The two paths of refrigerant exchange heat in the economizer. The medium-temperature and medium-pressure liquid refrigerant in the first path is further condensed and cooled in the economizer, and then throttled and depressurized by the first expansion valve to form a low-temperature and low-pressure liquid refrigerant. The low-temperature and low-pressure liquid refrigerant enters the evaporation-cooled heat exchanger through the fourth check valve and the first refrigerant liquid main pipe. After the low-temperature and low-pressure liquid refrigerant exchanges heat with the industrial waste heat wastewater in the cooling inner pipe and on the surface of the heat exchanger, the liquid refrigerant is heated and vaporized into refrigerant vapor. Then, after passing through the first refrigerant vapor main pipe and the first solenoid valve, it enters through the b-end of the four-way valve, exits through the c-end, and then enters the suction port of the compressor after passing through the gas-liquid separator for compression, completing a main cycle process of the refrigerant. The medium-temperature and medium-pressure liquid refrigerant in the second path is throttled and depressurized by the second expansion valve and further heated and vaporized in the economizer to form a medium-temperature and low-pressure steam. The medium-temperature and low-pressure steam returns to the enthalpy-increasing port of the compressor after passing through the third solenoid valve, completing an auxiliary enthalpy-increasing cycle.

[0088] In this mode, the fan is closed, and the water pump starts prior to the compressor. The industrial waste heat wastewater first enters the cooling inner pipe through the cooling main pipe, exchanges heat with the refrigerant liquid for the first time, then enters the cooling sub-pipe, and then enters the cooling outer pipe, evenly distributed on the surface of each heat exchange plate, and exchanges heat with the liquid refrigerant for the second time. The liquid refrigerant exchanges heat twice, vaporizes and heats up, and the hot water releases heat and cools down, and is discharged through the drain solenoid valve through the drain pipe, realizing the water-source heating function.

[0089] Embodiment 2

[0090] Such as Figure 8As shown in the figure, the difference between the cascade evaporative cooling heat pump module unit of this embodiment and that of the first embodiment lies in that: the connection mode of the cooling outer pipe 203, the water distribution tank 201, and the water distribution microporous plate 202 between two adjacent heat exchange units is as follows: a water distribution tank 201 is arranged above the cooling outer pipe 203, water distribution microporous plates 202 are arranged on both sides of the water distribution tank 201, the lower end of the water distribution microporous plate 202 is connected to the pipe wall of the cooling outer pipe 203, and the upper end is connected to the pipe wall of the horizontal section 205 of the lowest condenser pipe of the upper heat exchange unit; the bottom of the cooling outer pipe 203 is connected to the top of the horizontal section 205 of the uppermost condenser pipe in the heat exchange unit to which it belongs; a plurality of the brackets 206 are arranged at intervals between the top of the cooling outer pipe 203 and the bottom of the horizontal section 205 of the lowest condenser pipe of the upper heat exchange unit.

[0091] Embodiment III

[0092] As Figure 9 shown in the figure, the difference between the cascade evaporative cooling heat pump module unit of this embodiment and that of the first embodiment lies in that: a water distribution tank 201 is arranged between the horizontal section 205 of the lowest condenser pipe of the upper heat exchange unit and the horizontal section 205 of the uppermost condenser pipe of the lower heat exchange unit, water distribution microporous plates 202 are arranged on both sides of the water distribution tank 201, the lower end of the water distribution microporous plate 202 is connected to the pipe wall of the horizontal section 205 of the uppermost condenser pipe of the lower heat exchange unit, and the upper end is connected to the pipe wall of the horizontal section 205 of the lowest condenser pipe of the upper heat exchange unit; the cooling outer pipe 203 is arranged in the water distribution tank 201. The bottom of the cooling outer pipe 203 is connected to the top of the horizontal section 205 of the uppermost condenser pipe in the heat exchange unit to which it belongs and is spaced from the horizontal section 205 of the lowest condenser pipe of the upper heat exchange unit; a plurality of the brackets 206 are arranged at intervals between the top of the cooling outer pipe 203 and the bottom of the horizontal section 205 of the lowest condenser pipe of the upper heat exchange unit.

[0093] Embodiment IV

[0094] As Figure 10 shown in the figure, the difference between the cascade evaporative cooling heat pump module unit of this embodiment and that of the third embodiment lies in that: the top of the cooling outer pipe 203 is connected to the bottom of the horizontal section 205 of the lowest condenser pipe of the upper heat exchange unit and is spaced from the horizontal section 205 of the uppermost condenser pipe in the heat exchange unit to which it belongs; a plurality of the brackets 206 are arranged at intervals between the bottom of the cooling outer pipe 203 and the top of the horizontal section 205 of the uppermost condenser pipe in the heat exchange unit to which the cooling outer pipe 203 belongs.

[0095] Embodiment V

[0096] As Figure 11 and Figure 12As shown in the figure, the difference between this embodiment and the first embodiment is as follows: the unit does not include the multi-connected indoor unit 12, and the unit is connected to the indoor heat exchanger (water machine); the indoor heat exchanger includes an outdoor heat exchange part 13 and an indoor heat exchange part; the outdoor heat exchange part 13 is communicated with the indoor heat exchange part through a refrigerant carrier (cooling water) channel; the outdoor heat exchange part 13 further includes a refrigerant heat exchange channel that exchanges heat with the refrigerant carrier (cooling water) channel; the refrigerant heat exchange channel has an m end and an n end, and the m end and the n end respectively replace the j end and the k end of the multi-connected indoor unit 12 and are connected to the refrigerant operation assembly 6; the outdoor heat exchange part 13 is arranged in the equipment room inside the unit.

[0097] In a cascade evaporation-cooled heat pump module unit of this embodiment, during heat exchange, the refrigerant in the refrigerant operation assembly enters the refrigerant heat exchange channel of the outdoor heat exchange part and exchanges heat with the refrigerant carrier (cooling water) in its refrigerant carrier channel, and then the refrigerant carrier (cooling water) is transported to the indoor heat exchange part to exchange heat with the indoor air.

[0098] The above embodiments should not limit the present invention in any way, and all technical solutions obtained by using equivalent replacements or equivalent conversions fall within the protection scope of the present invention.

Claims

1. A cascade evaporative cooling heat pump modular unit, characterized in that: It includes an evaporative cooling heat exchanger, an air-cooled heat exchanger, and a refrigerant operation assembly; the evaporative cooling heat exchanger and the air-cooled heat exchanger are connected to the refrigerant operation assembly in parallel; the refrigerant operation assembly is used to operate the refrigerant to exchange heat in the evaporative cooling heat exchanger or the air-cooled heat exchanger; the evaporative cooling heat exchanger includes a plurality of heat exchange plates, and the plurality of heat exchange plates are arranged at intervals in a direction perpendicular to the evaporation heat exchange surface; each heat exchange plate includes a plurality of heat exchange units; the plurality of heat exchange units are arranged vertically, and the heat exchange unit is a plate-like structure formed by arranging a plurality of horizontal sections of condensing pipes vertically, and both ends of the plurality of horizontal sections of condensing pipes are connected by condensing pipe bending sections to form at least one refrigerant heat exchange channel, and both sides of the plate-like structure form an evaporation heat exchange surface; there is no gap connection between adjacent two horizontal sections of condensing pipes in the vertically arranged plurality of horizontal sections of condensing pipes in the plate-like structure, so that the evaporation heat exchange surface has continuity and is concave-convex; a cooling outer pipe is arranged above the uppermost horizontal section of the condensing pipe; a water distribution tank is arranged between the cooling outer pipe and the uppermost horizontal section of the condensing pipe, and a support is arranged in the water distribution tank between the cooling outer pipe and the horizontal section of the condensing pipe; water distribution microporous plates are arranged on both sides of the water distribution tank; the upper end of the water distribution microporous plate is connected to the pipe wall of the cooling outer pipe, and the lower end is connected to the pipe wall of the uppermost horizontal section of the condensing pipe, so that the water distribution tank is fixed between the cooling outer pipe and the heat exchange unit in an embedded manner to form an integral structure; the cooling outer pipe is provided with a number of water outlet holes communicating with the water distribution tank for evenly injecting water into the water distribution tank; the water distribution tank is used to evenly distribute the water injected by the cooling outer pipe through the water distribution microporous plates on the evaporation heat exchange plate surface to form a water curtain to exchange heat with the refrigerant outside the refrigerant heat exchange channel; a cooling inner pipe is also arranged in the refrigerant heat exchange channel for the water passing through the cooling inner pipe to exchange heat with the refrigerant inside the refrigerant heat exchange channel; in two adjacent heat exchange units, the number of horizontal sections of condensing pipes in the heat exchange unit located on the lower side is less than the number of horizontal sections of condensing pipes in the heat exchange unit located on the upper side, so that the heat exchange area of the evaporation heat exchange surfaces of the plurality of heat exchange units decreases from top to bottom; the unit also includes a water tank; a cooling filler layer is also arranged between the evaporative cooling heat exchanger and the water tank for cooling the unevaporated water dripping from the evaporative cooling heat exchanger and then discharging it into the water tank.

2. The cascade evaporative cooling heat pump modular unit according to claim 1, wherein: Two adjacent heat exchange units are connected by a condensing pipe bending section to make their respective refrigerant heat exchange channels correspondingly communicate; the top of the cooling outer pipe in the heat exchange unit located on the lower side of two adjacent heat exchange units is connected to the bottom of the lowermost horizontal section of the condensing pipe in the heat exchange unit located on the upper side; the plurality of supports are arranged at intervals between the bottom of the cooling outer pipe and the top of the uppermost horizontal section of the condensing pipe of the affiliated heat exchange unit.

3. The cascade evaporative cooling heat pump modular unit according to claim 2, wherein: The connection modes of the cooling outer pipe, the water distribution tank and the water distribution microporous plate between two adjacent heat exchange units are replaced as follows: a water distribution tank is arranged above the cooling outer pipe, water distribution microporous plates are arranged on both sides of the water distribution tank, the lower end of the water distribution microporous plate is connected to the pipe wall of the cooling outer pipe, and the upper end is connected to the pipe wall of the horizontal section of the condensate pipe at the lowermost side of the heat exchange unit on the upper side; the bottom of the cooling outer pipe is connected to the top of the horizontal section of the condensate pipe at the uppermost side in the heat exchange unit to which it belongs; a plurality of the supports are arranged at intervals between the top of the cooling outer pipe and the bottom of the horizontal section of the condensate pipe at the lowermost side of the heat exchange unit on the upper side.

4. The cascade evaporative cooling heat pump modular unit according to claim 2, characterized in that: The connection modes of the cooling outer pipe, the water distribution tank and the water distribution microporous plate between two adjacent heat exchange units are replaced as follows: a water distribution tank is arranged between the horizontal section of the condensate pipe at the lowermost side of the heat exchange unit on the upper side and the horizontal section of the condensate pipe at the uppermost side of the heat exchange unit on the lower side, water distribution microporous plates are arranged on both sides of the water distribution tank, the lower end of the water distribution microporous plate is connected to the pipe wall of the horizontal section of the condensate pipe at the uppermost side of the heat exchange unit on the lower side, and the upper end is connected to the pipe wall of the horizontal section of the condensate pipe at the lowermost side of the heat exchange unit on the upper side; the cooling outer pipe is arranged in the water distribution tank: the top of the cooling outer pipe is connected to the bottom of the horizontal section of the condensate pipe at the lowermost side of the heat exchange unit on the upper side and is spaced from the horizontal section of the condensate pipe at the uppermost side of the heat exchange unit to which it belongs, and a plurality of the supports are arranged at intervals between the bottom of the cooling outer pipe and the top of the horizontal section of the condensate pipe at the uppermost side of the heat exchange unit to which the cooling outer pipe belongs; or the bottom of the cooling outer pipe is connected to the top of the horizontal section of the condensate pipe at the uppermost side of the heat exchange unit to which it belongs and is spaced from the horizontal section of the condensate pipe at the lowermost side of the heat exchange unit on the upper side, and a plurality of the supports are arranged at intervals between the top of the cooling outer pipe and the bottom of the horizontal section of the condensate pipe at the lowermost side of the heat exchange unit on the upper side.

5. The cascade evaporative cooling heat pump modular unit according to claim 4, wherein: The number of water outlet holes of the cooling outer pipe in the heat exchange unit on the lower side is smaller than the number of water outlet holes of the cooling outer pipe on the upper side, so as to meet the water distribution requirement of the evaporation heat exchange surface corresponding to the heat exchange area.

6. The cascade evaporative cooling heat pump modular unit according to claim 1, characterized in that: A refrigerant vapor inlet is provided at the top end of the refrigerant heat exchange channel of the heat exchange plate, and a refrigerant liquid outlet is provided at the bottom end; an external cooling water inlet is provided at one end of the cooling outer tube of the heat exchange plate; both ends of the cooling inner tube penetrate out of the refrigerant heat exchange channel, an internal cooling water inlet is provided at the bottom end, and an internal cooling water outlet is provided at the top end; the refrigerant vapor inlets of multiple heat exchange plates are connected to a first refrigerant vapor main pipe, the refrigerant liquid outlets of multiple heat exchange plates are connected to a first refrigerant liquid main pipe, and the external cooling water inlets of the cooling outer tubes of multiple heat exchange plates are connected to an external cooling water inlet manifold; the external cooling water inlet manifold is further connected to a cooling auxiliary pipe; the internal cooling water inlets of multiple cooling inner tubes are connected to a cooling main pipe, and the internal cooling water outlets are connected to an internal cooling water outlet collecting pipe; the internal cooling water outlet collecting pipe is communicated with the cooling auxiliary pipe; the air-cooled heat exchanger is connected to a second refrigerant vapor main pipe and a second refrigerant liquid main pipe; the first refrigerant vapor main pipe and the second refrigerant vapor main pipe are connected in parallel and then connected to the refrigerant operation assembly, and the first refrigerant liquid main pipe and the second refrigerant liquid main pipe are connected in parallel and then connected to the refrigerant operation assembly; a first solenoid valve is provided on the first refrigerant vapor main pipe, and a second solenoid valve is provided on the second refrigerant vapor main pipe.

7. The cascade evaporative cooling heat pump modular unit according to claim 6, characterized in that: A water pump is provided in the water tank; the water outlet end of the water pump is communicated with the cooling main pipe, and is used for sending the cooling water in the water tank into the cooling inner tube of the evaporative cooler through the cooling main pipe and sending it into the external cooling tube through the cooling auxiliary pipe; a water replenishing port is further provided on the water tank; a sewage discharge pipe is connected to the bottom of the water tank; a sewage discharge solenoid valve is provided on the sewage discharge pipe.

8. The cascade evaporative cooling heat pump modular unit according to claim 7, characterized in that: The refrigerant operation assembly includes a compressor, a four-way valve, a first solenoid valve, a second solenoid valve, a first check valve, a liquid storage tank, a drying filter, an economizer, a first expansion valve, a second check valve, a gas-liquid separator, a third solenoid valve, a second expansion valve, a third check valve, a fourth check valve; the unit further includes a multi-connected indoor unit; the compressor has an air outlet, a suction port and an enthalpy-increasing port; the four-way valve has an a end, a b end, a c end and a d end; the economizer has an e end, an f end, a g end and an h end, the e end and the f end are communicated inside the economizer, and the g end and the h end are communicated inside the economizer; the multi-connected indoor unit has a j end and a k end, and the j end and the k end are two ports of the refrigerant channel of the multi-connected indoor unit. The air outlet of the compressor, the a end and the b end of the four-way valve, the pipeline formed by the parallel connection of the first refrigerant vapor main pipe and the second refrigerant vapor main pipe, the first refrigerant vapor main pipe of the evaporative cooler, and the first solenoid valve are connected to the first refrigerant liquid main pipe, the first check valve, the liquid storage tank, the drying filter, the h end and the g end of the economizer, the first expansion valve, the second check valve, the j end and the k end of the multi-connected indoor unit, the d end and the c end of the four-way valve, the gas-liquid separator, and the suction port of the compressor to form a first refrigeration operation channel. The outlet of the compressor, the a-end and b-end of the four-way valve, the pipeline in parallel with the first refrigerant vapor main pipe and the second refrigerant vapor main pipe, the second refrigerant vapor main pipe of the air-cooled heat exchanger, and the second solenoid valve are sequentially connected to the second refrigerant liquid main pipe, the first check valve, the liquid storage tank, the dryer filter, the h-end and g-end of the economizer, the first expansion valve, the second check valve, the j-end and k-end of the multi-connected indoor unit, the d-end and c-end of the four-way valve, the gas-liquid separator, and the suction port of the compressor to form a second refrigeration operation channel; The outlet of the compressor, the a-end and d-end of the four-way valve, the k-end and j-end of the multi-connected indoor unit, the third check valve, the liquid storage tank, the dryer filter, the h-end and g-end of the economizer, the first expansion valve, the fourth check valve, the pipeline in parallel with the first refrigerant liquid main pipe and the second refrigerant liquid main pipe, the first refrigerant liquid main pipe of the evaporative condenser heat exchanger and the first refrigerant vapor main pipe and the first solenoid valve, the b-end and c-end of the four-way valve, the gas-liquid separator, and the suction port of the compressor are sequentially connected to form a first heating operation channel; The outlet of the compressor, the a-end and d-end of the four-way valve, the k-end and j-end of the multi-connected indoor unit, the third check valve, the liquid storage tank, the dryer filter, the h-end and g-end of the economizer, the first expansion valve, the fourth check valve, the pipeline in parallel with the first refrigerant liquid main pipe and the second refrigerant liquid main pipe, the second refrigerant liquid main pipe of the air-cooled heat exchanger and the second refrigerant vapor main pipe and the second solenoid valve, the b-end and c-end of the four-way valve, the gas-liquid separator, and the suction port of the compressor are sequentially connected to form a second heating operation channel; In the first heating operation channel and the second heating operation channel, the outlet of the dryer filter, the second expansion valve, the e-end and f-end of the economizer, the third solenoid valve, and the enthalpy-increasing port of the compressor are sequentially connected to form an auxiliary enthalpy-increasing loop; the internal channel between the e-end and f-end in the economizer exchanges heat with the internal channel between the h-end and g-end.

9. The cascade evaporation-cooled heat pump module unit according to claim 8, wherein: The unit further includes a machine shell, and a ventilation opening is provided at the top of the machine shell; a fan is provided in the ventilation opening; the evaporative condenser heat exchanger and the cooling packing layer are sequentially provided below the fan; the air-cooled heat exchanger is provided outside the evaporative condenser heat exchanger; the water tank is provided below the evaporative condenser heat exchanger and the air-cooled heat exchanger, and air-permeable grilles are further provided on the side wall of the machine shell corresponding to the air-cooled heat exchanger; a water-proof plate is further provided between the fan and the evaporative condenser heat exchanger; an equipment room is further provided below the water tank in the machine shell; the refrigerant operation assembly is installed in the equipment room, and an electric control box is further provided in the equipment room for controlling the fan, the water pump, the compressor, the four-way valve, the first solenoid valve, the second solenoid valve, and the third solenoid valve.

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