A falling film evaporative heat pump heat recovery unit

Abstract

The present invention provides a falling film evaporative cooling and heat pump heat recovery unit, which integrates an evaporative condenser and a falling film heat exchanger in one unit and adds a heat recovery function, thereby improving the heat exchange efficiency and meeting the needs of a heat exchange environment with high heat exchange requirements. The medium output port of the compressor is connected to the inlet of the oil separator, the clean medium outlet of the oil separator is connected to the medium inlet of the hot water heat exchanger, the medium outlet of the hot water heat exchanger is connected to the D port of the four-way valve, the C port of the four-way valve is connected to the first medium port of the evaporative condenser, a fifth ball valve is arranged on the medium outlet main line of the second medium port of the evaporative condenser, the output end of the medium outlet main line is connected to the first one-way valve and then to the first port of the liquid reservoir, the second port of the liquid reservoir is connected to the inlet of the drying filter, and the first medium branch of the outlet of the drying filter is sequentially provided with a third sight glass and an electronic expansion valve and then led out in two ways.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchange structures, in particular to a falling film evaporative heat pump heat recovery unit. Background Art

[0002] Conventional heat exchange units only include an evaporative condenser or a falling film heat exchanger. In actual use, their heat exchange performance is average and cannot meet the application requirements of heat exchange environments with higher heat exchange requirements. Summary of the invention

[0003] In view of the above problems, the present invention provides a falling film evaporative heat pump heat recovery unit, which integrates an evaporative condenser and a falling film heat exchanger in one unit and adds a heat recovery function, thereby improving the heat exchange efficiency and meeting the needs of heat exchange environments with higher heat exchange requirements.

[0004] A falling film evaporative cooling and heat pump heat recovery unit, characterized in that it comprises a compressor, a hot water heat exchanger, a falling film heat exchanger, and an evaporative condenser, wherein the medium output port of the compressor is connected to the inlet of an oil separator, the clean medium outlet of the oil separator is connected to the medium inlet of the hot water heat exchanger, the medium outlet of the hot water heat exchanger is connected to the D port of a four-way valve, the C port of the four-way valve is connected to the first medium port of the evaporative condenser, a fifth ball valve is arranged on the medium outlet main line of the second medium port of the evaporative condenser, and the output end of the medium outlet main line is connected to the first medium port of the evaporative condenser. A one-way valve is connected to the first port of the liquid reservoir, the second port of the liquid reservoir is connected to the inlet of the drying filter, and the first medium branch of the outlet of the drying filter is sequentially provided with a third sight glass and an electronic expansion valve, which are led out in two ways, one of which is connected to the third one-way valve and then connected back to the main medium outlet line, and the other is connected to the fourth one-way valve and then connected in parallel with two pipes, the first pipe is connected to the second one-way valve and then connected to the first port of the liquid reservoir, the second pipe is connected to the fourth ball valve, and the fifth one-way valve is connected to the first medium port of the falling film heat exchanger, and the second one of the outlets of the drying filter is connected to the first medium port of the falling film heat exchanger. After the medium branch is connected to the fourth angle valve, one path is connected to the medium-pressure air supply port of the compressor through the first high-temperature expansion valve, and the other path is connected to the medium inlet main pipe of the compressor through the second high-temperature expansion valve. The S port of the four-way valve is connected to the medium inlet main pipe of the compressor, and the E port of the four-way valve is connected to the second medium port of the falling film heat exchanger. The bottom of the shell of the falling film heat exchanger is provided with a medium auxiliary port, and the medium auxiliary port is connected to the second connecting pipe corresponding to the fourth ball valve through an electromagnetic valve and a corresponding auxiliary pipeline. It also includes an injection return oil pipeline. The bottom side of the falling film heat exchanger is divided into A medium outlet is separately provided, each of the medium outlets is respectively connected to a corresponding ball valve and then connected to the return oil pipeline corresponding to the sixth one-way valve, the output end of the return oil pipeline is connected to an injection pump, one end of the injection pump is connected to the third angle valve and then connected to the second medium outlet of the hot water heat exchanger, the other end is connected to the second sight glass and then connected to the medium inlet main pipe of the compressor, the hot water pipeline inlet of the hot water heat exchanger is connected to a hot water pump, the water pipeline inlet of the falling film heat exchanger is connected to a load pump, a spray pump and a fan are arranged in the evaporative condenser, and the spray pump is connected to the spray pipe.

[0005] It is further characterized by:

[0006] The two impurity outlets of the oil separator are respectively connected to angle valves and then connected to the oil filter. The output port of the oil filter is connected to the first sight glass and then connected to the medium inlet main pipe of the compressor;

[0007] Under refrigeration conditions, the cooling oil medium of the compressor flows into the oil separator from the medium output port, and then flows from the outlet of the oil separator through the D port and C port of the four-way valve to the evaporative condenser, and then flows into the liquid storage tank and the drying filter after passing through the fifth ball valve and the first check valve, and then flows into the falling film heat exchanger after passing through the third sight glass, the electronic expansion valve, the fourth check valve, the fourth ball valve, and the fifth check valve. After heat exchange, the medium flows into the medium inlet main pipe of the compressor along the E port and S port of the four-way valve. At this time, the hot water pump is not running, the load pump is running, the spray pump is running, and the fan is running;

[0008] Under refrigeration conditions, when the ejector pump is turned on, the medium at the medium outlet of the falling film heat exchanger passes through the corresponding passage ball valve into the sixth one-way valve, then passes through the ejector pump, flows through the second sight glass, and then flows into the medium inlet main pipe of the compressor; the medium at the second medium outlet of the hot water heat exchanger passes through the third angle valve, passes through the ejector pump, flows through the second sight glass, and then flows into the medium inlet main pipe of the compressor;

[0009] Under heating operation conditions, the cooling oil medium of the compressor flows into the oil separator from the medium output port, and then flows from the outlet of the oil separator through the D port and the E port of the four-way valve and then flows into the second medium port of the falling film heat exchanger. The solenoid valve is opened, and the medium flows from the medium auxiliary port through the solenoid valve, the fourth angle valve, the second non-return valve and then flows into the liquid storage and the drying filter. Then, it passes through the third sight glass, the electronic expansion valve, the third non-return valve, and the fifth ball valve and is connected to the second medium port of the evaporative condenser. The medium flows out of the medium through the first medium port of the evaporative condenser to the C port of the four-way valve, and the medium flows into the medium inlet main pipe of the compressor through the S port of the four-way valve. Under heating conditions, the solenoid valve is opened, the hot water pump is not running, the load pump is running, the spray pump is running, and the fan is running;

[0010] Under hot water operation conditions, the cooling oil medium of the compressor flows into the oil separator from the medium output port, and then flows from the outlet of the oil separator through the D port and the E port of the four-way valve and then flows into the second medium port of the falling film heat exchanger. The solenoid valve is opened, and the medium flows from the medium auxiliary port through the solenoid valve, the fourth angle valve, the second non-return valve and then flows into the liquid storage and the drying filter. After that, it passes through the third sight glass, the electronic expansion valve, the third non-return valve, and the fifth ball valve and is connected to the second medium port of the evaporative condenser. The medium flows out of the medium through the first medium port of the evaporative condenser to the C port of the four-way valve, and the medium flows into the medium inlet main pipe of the compressor through the S port of the four-way valve. Under heating conditions, the solenoid valve is opened, the hot water pump is running, the load pump is running, the spray pump is running, and the fan is running;

[0011] Under the refrigeration + hot water operation condition, the cooling oil medium of the compressor flows into the oil separator from the medium output port, and then flows from the outlet of the oil separator through the D port and C port of the four-way valve to the evaporative condenser, and then flows into the liquid storage tank and the drying filter after passing through the fifth ball valve and the first check valve, and then flows into the falling film heat exchanger after passing through the third sight glass, the electronic expansion valve, the fourth check valve, the fourth ball valve, and the fifth check valve. After heat exchange, the medium flows into the medium inlet main pipe of the compressor along the E port and S port of the four-way valve. At this time, the hot water pump is running, the load pump is running, the spray pump is not running, and the fan is not running;

[0012] Under the refrigeration + hot water operation condition, when the ejector pump is turned on, the medium at the medium outlet of the falling film heat exchanger passes through the corresponding passage ball valve into the sixth one-way valve, then passes through the ejector pump, flows through the second sight glass, and then flows into the medium inlet main pipe of the compressor; the medium at the second medium outlet of the hot water heat exchanger passes through the third angle valve, passes through the ejector pump, flows through the second sight glass, and then flows into the medium inlet main pipe of the compressor.

[0013] After adopting the structure of the present invention, a medium auxiliary port is set at the bottom of the falling film heat exchanger, and a hot water heat exchanger is added to the structure at the same time. The evaporative condenser and the falling film heat exchanger are integrated into one unit, and a heat recovery function is added at the same time, thereby improving the heat exchange efficiency and meeting the needs of a heat exchange environment with higher heat exchange requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the present invention;

[0015] The names corresponding to the serial numbers in the figure are as follows:

[0016] Compressor 1, oil separator 2, hot water heat exchanger 3, four-way valve 4, C port 4C, D port 4D, E port 4E, S port 4S, falling film heat exchanger 5, medium auxiliary port 51, medium outlet 52, medium outlet 53, first angle valve 6, second angle valve 7, third angle valve 8, fourth angle valve 9, first sight glass 10, second sight glass 11, third sight glass 12, first check valve 13, second check valve 14, third check valve 15, fourth check valve 1 6. Fifth one-way valve 17, sixth one-way valve 18, first ball valve 19, second ball valve 20, third ball valve 21, fourth ball valve 22, solenoid valve 23, electronic expansion valve 24, first high-temperature expansion valve 25, second high-temperature expansion valve 26, drying filter 27, oil filter 28, liquid reservoir 29, ejector pump 30, fifth ball valve 31, evaporative condenser 32, load pump 33, hot water pump 34, spray pump 35, fan 36, spray pipe 37. DETAILED DESCRIPTION

[0017] A falling film evaporative heat pump heat recovery unit, see Figure 1:It includes a compressor 1, a hot water heat exchanger 3, a falling film heat exchanger 5, and an evaporative condenser 32. The medium output port of the compressor 1 is connected to the inlet of the oil separator 2, the clean medium outlet of the oil separator 2 is connected to the medium inlet of the hot water heat exchanger 3, the medium outlet of the hot water heat exchanger 3 is connected to the D port 4D of the four-way valve 4, the C port 4C of the four-way valve 4 is connected to the first medium port of the evaporative condenser 32, and a fifth ball valve 31 is arranged on the medium outlet main line of the second medium port of the evaporative condenser 32. The output end of the medium outlet main line is connected to the first check valve 13 and then connected to the first port of the liquid reservoir 29. The second port of the liquid reservoir 29 is connected to the inlet of the drying filter 27. The first medium branch of the outlet of the drying filter 27 is sequentially provided with a third sight glass 12 and an electronic expansion valve 24, and then led out in two ways, one of which is connected to the third check valve 15 and then connected back to the medium outlet. The first pipe is connected to the second one-way valve 14 and then connected to the first port of the liquid storage device 29, the second pipe is connected to the fourth ball valve 22 and the fifth one-way valve 17 and then connected to the first medium port of the falling film heat exchanger 5, the second medium branch of the outlet of the drying filter 27 is connected to the fourth angle valve 9 and then connected to the medium pressure air supply port of the compressor 1 through the first high-temperature expansion valve 25, and the other is connected to the medium inlet pipe of the compressor 1 through the second high-temperature expansion valve 26, the S port 4S of the four-way valve 4 is connected to the medium inlet pipe of the compressor 1, and the E port 4E of the four-way valve 4 is connected to the second medium port of the falling film heat exchanger 5. The bottom of the shell of the falling film heat exchanger 5 is provided with a medium auxiliary port 51, and the medium auxiliary port 51 is connected to the second pipe corresponding to the fourth ball valve 22 through the solenoid valve 23 and the corresponding auxiliary pipeline.

[0018] It also includes an injection return oil pipeline. The bottom side of the falling film heat exchanger 5 is respectively provided with medium outlets 52 and 53, which are respectively connected to the corresponding first ball valve 19 and the second ball valve 20 and then connected to the return oil pipeline corresponding to the sixth check valve 18. The output end of the return oil pipeline is connected to the injection pump 30. One end of the injection pump 30 is connected to the third angle valve 8 and then connected to the second medium outlet of the hot water heat exchanger 3. The other end is connected to the second sight glass 11 and the third ball valve 21 and then connected to the medium inlet main pipe of the compressor 1.

[0019] The hot water pipe inlet of the hot water heat exchanger 3 is connected to a hot water pump 34 , the water pipe inlet of the falling film heat exchanger 5 is connected to a load pump 33 , the evaporative condenser is provided with a spray pump 35 and a fan 36 , and the spray pump 35 is connected to a spray pipe 37 .

[0020] The two impurity outlets of the oil separator 2 are respectively connected to the first angle valve 6 and the second angle valve 7 and then converged to the oil filter 28 . The output port of the oil filter 28 is connected to the first sight glass 10 and then connected to the medium inlet main pipe of the compressor 1 .

[0021] Here’s how it works:

[0022] Under refrigeration conditions, the cooling oil medium of the compressor flows into the oil separator from the medium output port, and then flows from the outlet of the oil separator through the D port and C port of the four-way valve to the evaporative condenser, and then flows into the liquid storage tank and the drying filter after passing through the fifth ball valve and the first check valve, and then flows into the falling film heat exchanger after passing through the third sight glass, the electronic expansion valve, the fourth check valve, the fourth ball valve, and the fifth check valve. After heat exchange, the medium flows into the medium inlet main pipe of the compressor along the E port and S port of the four-way valve. At this time, the hot water pump is not running, the load pump is running, the spray pump is running, and the fan is running;

[0023] Under refrigeration conditions, when the ejector pump is turned on, the medium at the medium outlet of the falling film heat exchanger passes through the corresponding passage ball valve into the sixth one-way valve, then passes through the ejector pump, flows through the second sight glass, and then flows into the medium inlet main pipe of the compressor; the medium at the second medium outlet of the hot water heat exchanger passes through the third angle valve, passes through the ejector pump, flows through the second sight glass, and then flows into the medium inlet main pipe of the compressor;

[0024] Under heating operation conditions, the cooling oil medium of the compressor flows into the oil separator from the medium output port, and then flows from the outlet of the oil separator through the D port and the E port of the four-way valve and then flows into the second medium port of the falling film heat exchanger. The solenoid valve is opened, and the medium flows from the medium auxiliary port through the solenoid valve, the fourth angle valve, the second non-return valve and then flows into the liquid storage and the drying filter. Then, it passes through the third sight glass, the electronic expansion valve, the third non-return valve, and the fifth ball valve and is connected to the second medium port of the evaporative condenser. The medium flows out of the medium through the first medium port of the evaporative condenser to the C port of the four-way valve, and the medium flows into the medium inlet main pipe of the compressor through the S port of the four-way valve. Under heating conditions, the solenoid valve is opened, the hot water pump is not running, the load pump is running, the spray pump is running, and the fan is running;

[0025] Under hot water operation conditions, the cooling oil medium of the compressor flows into the oil separator from the medium output port, and then flows from the outlet of the oil separator through the D port and the E port of the four-way valve and then flows into the second medium port of the falling film heat exchanger. The solenoid valve is opened, and the medium flows from the medium auxiliary port through the solenoid valve, the fourth angle valve, the second non-return valve and then flows into the liquid storage and the drying filter. After that, it passes through the third sight glass, the electronic expansion valve, the third non-return valve, and the fifth ball valve and is connected to the second medium port of the evaporative condenser. The medium flows out of the medium through the first medium port of the evaporative condenser to the C port of the four-way valve, and the medium flows into the medium inlet main pipe of the compressor through the S port of the four-way valve. Under heating conditions, the solenoid valve is opened, the hot water pump is running, the load pump is running, the spray pump is running, and the fan is running;

[0026] Under the refrigeration + hot water operation condition, the cooling oil medium of the compressor flows into the oil separator from the medium output port, and then flows from the outlet of the oil separator through the D port and C port of the four-way valve to the evaporative condenser, and then flows into the liquid storage tank and the drying filter after passing through the fifth ball valve and the first check valve, and then flows into the falling film heat exchanger after passing through the third sight glass, the electronic expansion valve, the fourth check valve, the fourth ball valve, and the fifth check valve. After heat exchange, the medium flows into the medium inlet main pipe of the compressor along the E port and S port of the four-way valve. At this time, the hot water pump is running, the load pump is running, the spray pump is not running, and the fan is not running;

[0027] Under the refrigeration + hot water operation condition, when the ejector pump is turned on, the medium at the medium outlet of the falling film heat exchanger passes through the corresponding passage ball valve into the sixth one-way valve, then passes through the ejector pump, flows through the second sight glass, and then flows into the medium inlet main pipe of the compressor; the medium at the second medium outlet of the hot water heat exchanger passes through the third angle valve, passes through the ejector pump, flows through the second sight glass, and then flows into the medium inlet main pipe of the compressor;

[0028] Under any working condition, the oil return process of the medium oil through the oil separator is to pass through the two impurity outlets of the oil separator through the corresponding first angle valve and second angle valve and then be collected to the oil filter, and then after being filtered by the filter, it flows into the medium inlet main pipe of the compressor through the first sight glass;

[0029] Under any operating conditions, the exhaust gas temperature of the medium at high temperature is cooled by the high-temperature medium flowing out of the drying filter, which passes through the fourth angle valve and is connected to the medium-pressure air supply port of the compressor through the first high-temperature expansion valve, or is connected to the medium inlet main pipe of compressor 1 through the second high-temperature expansion valve.

[0030] A medium auxiliary port is set at the bottom of the falling film heat exchanger, and a hot water heat exchanger is added to the structure at the same time, which integrates the evaporative condenser and the falling film heat exchanger in one unit and adds a heat recovery function, thereby improving the heat exchange efficiency and meeting the needs of heat exchange environments with higher heat exchange requirements.

[0031] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0032] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A falling film evaporative heat pump heat recovery unit, characterized in that: It includes a compressor, a hot water heat exchanger, a falling film heat exchanger, and an evaporative condenser. The medium output port of the compressor is connected to the inlet of an oil separator, the clean medium outlet of the oil separator is connected to the medium inlet of the hot water heat exchanger, the medium outlet of the hot water heat exchanger is connected to the D port of a four-way valve, the C port of the four-way valve is connected to the first medium port of the evaporative condenser, and a fifth ball valve is arranged on the medium outlet main line of the second medium port of the evaporative condenser. The output end of the medium outlet main line is connected to the first one-way valve and then connected to the first port of the liquid reservoir. The second port of the liquid reservoir is connected to the inlet of a drying filter. A third sight glass and an electronic expansion valve are arranged in sequence on the first medium branch of the outlet of the drying filter, and then the outlet is divided into two routes, one of which is connected to the third one-way valve and then connected back to the medium outlet main line, and the other is connected to the fourth one-way valve and then connected to two pipes in parallel. The first pipe is connected to the second one-way valve and then connected to the first port of the liquid reservoir, the second pipe is connected to the fourth ball valve, the fifth one-way valve and then connected to the first medium port of the falling film heat exchanger, and the second medium branch of the outlet of the drying filter is connected to the fourth angle valve and then connected to the first medium port of the falling film heat exchanger. One way is connected to the medium-pressure air supply port of the compressor through the first high-temperature expansion valve, and the other way is connected to the medium inlet main pipe of the compressor through the second high-temperature expansion valve. The S port of the four-way valve is connected to the medium inlet main pipe of the compressor, and the E port of the four-way valve is connected to the second medium port of the falling film heat exchanger. The bottom of the shell of the falling film heat exchanger is provided with a medium auxiliary port, and the medium auxiliary port is connected to the second connecting pipe corresponding to the fourth ball valve through an electromagnetic valve and a corresponding auxiliary pipeline. It also includes an injection return oil pipeline. The bottom side of the falling film heat exchanger is respectively provided with medium The outlet is connected to the oil return pipeline corresponding to the sixth one-way valve after each medium outlet is connected to the corresponding ball valve, the output end of the oil return pipeline is connected to the ejection pump, one end of the ejection pump is connected to the second medium outlet of the hot water heat exchanger after being connected to the third angle valve, and the other end is connected to the second sight glass and then connected to the medium inlet main pipe of the compressor, the hot water pipeline inlet of the hot water heat exchanger is connected to a hot water pump, the water pipeline inlet of the falling film heat exchanger is connected to a load pump, and a spray pump and a fan are arranged in the evaporative condenser, and the spray pump is connected to the spray pipe.

2. A falling film evaporative heat pump heat recovery unit as claimed in claim 1, characterized in that: The two impurity outlets of the oil separator are respectively connected to angle valves and then converged to the oil filter. The output port of the oil filter is connected to the first sight glass and then connected to the medium inlet main pipe of the compressor.

3. A falling film evaporative heat pump heat recovery unit as claimed in claim 1, characterized in that: Under refrigeration conditions, the cooling oil medium of the compressor flows into the oil separator from the medium output port, and then flows from the outlet of the oil separator through the D port and C port of the four-way valve into the evaporative condenser, and then flows into the liquid storage tank and the drying filter after passing through the fifth ball valve and the first check valve, and then flows into the falling film heat exchanger after passing through the third sight glass, the electronic expansion valve, the fourth check valve, the fourth ball valve, and the fifth check valve. The medium after heat exchange flows into the medium inlet main pipe of the compressor along the E port and S port of the four-way valve. At this time, the hot water pump is not running, the load pump is running, the spray pump is running, and the fan is running.

4. A falling film evaporative heat pump heat recovery unit as claimed in claim 3, characterized in that: Under refrigeration conditions, when the ejector pump is turned on, the medium at the medium outlet of the falling film heat exchanger passes through the corresponding passage ball valve into the sixth one-way valve, then passes through the ejector pump, flows through the second sight glass, and finally flows into the medium inlet main pipe of the compressor; the medium at the second medium outlet of the hot water heat exchanger passes through the third angle valve, passes through the ejector pump, flows through the second sight glass, and finally flows into the medium inlet main pipe of the compressor.

5. The falling film evaporative heat pump heat recovery unit according to claim 1, characterized in that: Under heating operation conditions, the cooling oil medium of the compressor flows into the oil separator from the medium output port, and then flows from the outlet of the oil separator through the D port and E port of the four-way valve and then flows into the second medium port of the falling film heat exchanger. The solenoid valve is opened, and the medium flows from the medium auxiliary port through the solenoid valve, the fourth angle valve, the second one-way valve and then flows into the liquid reservoir and the drying filter. Then, it passes through the third sight glass, the electronic expansion valve, the third one-way valve, and the fifth ball valve and is connected to the second medium port of the evaporative condenser. The medium flows out of the medium through the first medium port of the evaporative condenser to the C port of the four-way valve, and the medium flows into the medium inlet main pipe of the compressor through the S port of the four-way valve. Under heating conditions, the solenoid valve is opened, the hot water pump is not running, the load pump is running, the spray pump is running, and the fan is running.

6. A falling film evaporative heat pump heat recovery unit according to claim 1, characterized in that: Under hot water operation conditions, the cooling oil medium of the compressor flows into the oil separator from the medium output port, and then flows from the outlet of the oil separator through the D port and E port of the four-way valve and then flows into the second medium port of the falling film heat exchanger. The solenoid valve is opened, and the medium flows from the medium auxiliary port through the solenoid valve, the fourth angle valve, the second one-way valve and then flows into the liquid reservoir and the drying filter. After that, it passes through the third sight glass, the electronic expansion valve, the third one-way valve, and the fifth ball valve and is connected to the second medium port of the evaporative condenser. The medium flows out of the medium through the first medium port of the evaporative condenser to the C port of the four-way valve, and the medium flows into the medium inlet main pipe of the compressor through the S port of the four-way valve. Under heating conditions, the solenoid valve is opened, the hot water pump is running, the load pump is running, the spray pump is running, and the fan is running.

7. The falling film evaporative heat pump heat recovery unit according to claim 1, characterized in that: Under the refrigeration + hot water operation condition, the cooling oil medium of the compressor flows into the oil separator from the medium output port, and then flows from the outlet of the oil separator through the D port and C port of the four-way valve into the evaporative condenser, and then flows into the liquid storage tank and the drying filter after passing through the fifth ball valve and the first check valve, and then flows into the falling film heat exchanger after passing through the third sight glass, the electronic expansion valve, the fourth check valve, the fourth ball valve, and the fifth check valve. The medium after heat exchange flows into the medium inlet main pipe of the compressor along the E port and S port of the four-way valve. At this time, the hot water pump is running, the load pump is running, the spray pump is not running, and the fan is not running.

8. A falling film evaporative heat pump heat recovery unit as claimed in claim 7, characterized in that: Under the refrigeration + hot water operation condition, when the ejector pump is turned on, the medium at the medium outlet of the falling film heat exchanger passes through the corresponding passage ball valve into the sixth one-way valve, then passes through the ejector pump, flows through the second sight glass, and then flows into the medium inlet main pipe of the compressor; the medium at the second medium outlet of the hot water heat exchanger passes through the third angle valve, passes through the ejector pump, flows through the second sight glass, and then flows into the medium inlet main pipe of the compressor.

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