A refrigeration system with multiple backups, high fault tolerance, multiple cooling sources and multiple modes of operation

Abstract

The present invention relates to the technical field of refrigeration equipment, and specifically to a refrigeration system with multiple backups, high fault tolerance, multiple cold sources and multiple modes of operation; the system comprises a liquid inlet pipe, a liquid outlet pipe, an ethylene glycol coil, a plate heat exchanger, a compressor, an evaporating coil, a liquid storage tank, an air-cooled condenser and a filter, the ethylene glycol coil is respectively connected to the liquid inlet pipe and the liquid outlet pipe, one end of the plate heat exchanger is respectively connected to the liquid inlet pipe and the liquid outlet pipe, the other end of the plate heat exchanger is respectively connected to the compressor, the air-cooled condenser, the evaporating coil and the liquid storage tank, the evaporating coil is respectively connected to the liquid storage tank and the compressor, and a filter is arranged at the liquid inlet pipe; through the above structure, refrigeration operations in multiple modes can be performed, and the high reliability performance of the unit in different modes can be simultaneously met.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration equipment, and in particular to a refrigeration system with multiple backups, high fault tolerance, multiple cold sources and multiple modes of operation. Background Art

[0002] A refrigeration system is a system that uses external energy to transfer heat from a substance (or environment) with a lower temperature to a substance (or environment) with a higher temperature. It specifically includes a compression module, a condensation module, a throttling element module, an evaporation module, and a refrigerant.

[0003] At present, most refrigeration systems on the market have relatively simple cold sources and heat exchange media, and their fault tolerance is relatively low. When problems occur in the low-temperature cold source of the condensing module or the heat exchange medium of the evaporating module, the system stops running and has poor reliability, which cannot simultaneously meet the high reliability performance of the unit in different modes. Summary of the invention

[0004] The purpose of the present invention is to provide a refrigeration system with multiple backups, high fault tolerance, multiple cold sources and multiple modes of operation, which solves the problem that the system cannot simultaneously meet the high reliability performance of the units in different modes.

[0005] To achieve the above-mentioned purpose, the present invention adopts a refrigeration system with multiple backups, high fault tolerance, multiple cold sources and multiple modes of operation, including a liquid inlet pipe, a liquid outlet pipe, an ethylene glycol coil, a plate heat exchanger, a compressor, an evaporating coil, a liquid storage tank, an air-cooled condenser and a filter. The ethylene glycol coil is respectively connected to the liquid inlet pipe and the liquid outlet pipe, one end of the plate heat exchanger is respectively connected to the liquid inlet pipe and the liquid outlet pipe, the other end of the plate heat exchanger is respectively connected to the compressor, the air-cooled condenser, the evaporating coil and the liquid storage tank, the evaporating coil is respectively connected to the liquid storage tank and the compressor, and the filter is provided at the liquid inlet pipe.

[0006] Among them, the multi-backup, high-fault-tolerance, multi-cold source, multi-mode refrigeration system also includes a first connecting pipeline, a second connecting pipeline, a third connecting pipeline, a fourth connecting pipeline, a fifth connecting pipeline, a sixth connecting pipeline, a seventh connecting pipeline and an eighth connecting pipeline. The first connecting pipeline is respectively connected to the liquid inlet pipe and the fourth connecting pipeline, the fifth connecting pipeline is respectively connected to the fourth connecting pipeline, the sixth connecting pipeline and the plate heat exchanger, the seventh connecting pipeline is respectively connected to the sixth connecting pipeline and the plate heat exchanger, the eighth connecting pipeline is respectively connected to the liquid outlet pipe, the sixth connecting pipeline and the seventh connecting pipeline, and the third connecting pipeline is respectively connected to the ethylene glycol coil, the fourth connecting pipeline and the liquid outlet pipe.

[0007] Wherein, the multi-backup high fault tolerance multi-cold source multi-mode refrigeration system also includes a first refrigeration pipeline, a second refrigeration pipeline, a third refrigeration pipeline, a fourth refrigeration pipeline, a fifth refrigeration pipeline, a sixth refrigeration pipeline, a seventh refrigeration pipeline, an eighth refrigeration pipeline, a ninth refrigeration pipeline, a tenth refrigeration pipeline, an eleventh refrigeration pipeline, a twelfth refrigeration pipeline, a thirteenth refrigeration pipeline and a fourteenth refrigeration pipeline, the first refrigeration pipeline is respectively connected to the compressor, the second refrigeration pipeline and the third refrigeration pipeline, the fourth refrigeration pipeline and the fifth refrigeration pipeline are respectively connected to the plate heat exchanger, the sixth refrigeration pipeline is The pipelines are respectively connected to the third refrigeration pipeline, the eighth refrigeration pipeline and the seventh refrigeration pipeline, the eighth refrigeration pipeline is respectively connected to the ninth refrigeration pipeline, the fifth refrigeration pipeline and the sixth refrigeration pipeline, the thirteenth refrigeration pipeline is respectively connected to the evaporating coil, the tenth refrigeration pipeline, the eleventh refrigeration pipeline and the twelfth refrigeration pipeline, the liquid storage tank is respectively connected to the ninth refrigeration pipeline, the tenth refrigeration pipeline, the eleventh refrigeration pipeline and the twelfth refrigeration pipeline, and the fourteenth refrigeration pipeline is respectively connected to the evaporating coil, the compressor and the second refrigeration pipeline.

[0008] Among them, the multi-backup, high-fault-tolerance, multi-cold-source, multi-mode refrigeration system also includes a first one-way valve, a second one-way valve, a third one-way valve, a fourth one-way valve, a fifth one-way valve, a sixth one-way valve and a seventh one-way valve. The first one-way valve is arranged on the tenth refrigeration pipeline, the second one-way valve is arranged on the eleventh refrigeration pipeline, the third one-way valve is arranged on the twelfth refrigeration pipeline, the fourth one-way valve is arranged on the first refrigeration pipeline, the fifth one-way valve is arranged on the second refrigeration pipeline, the sixth one-way valve is arranged on the seventh connecting pipeline, and the seventh one-way valve is arranged between the eighth refrigeration pipeline and the air-cooled condenser.

[0009] Among them, the multi-backup, high-fault-tolerance, multi-cold-source, multi-mode refrigeration system also includes a first three-way valve, a second three-way valve, a third three-way valve and a fourth three-way valve. The first three-way valve is arranged between the liquid inlet pipe, the first connecting pipeline and the second connecting pipeline, the second three-way valve is arranged between the third connecting pipeline and the liquid outlet pipe, the third three-way valve is arranged between the third refrigeration pipeline, the fourth refrigeration pipeline and the sixth refrigeration pipeline, and the fourth three-way valve is arranged between the fourth connecting pipeline, the fifth connecting pipeline and the sixth connecting pipeline.

[0010] Among them, the multi-backup, high-fault-tolerance, multi-cold-source, multi-mode refrigeration system also includes a four-way valve, an expansion valve, a first regulating valve and a second regulating valve. The four-way valve is arranged between the eighth refrigeration pipeline, the seventh refrigeration pipeline, the sixth refrigeration pipeline and the fifth refrigeration pipeline, the expansion valve is arranged on the thirteenth refrigeration pipeline, the first regulating valve is arranged on the third connecting pipeline, and the second regulating valve is arranged on the seventh connecting pipeline.

[0011] Among them, the multi-backup, high-fault-tolerance, multi-cold-source, multi-mode refrigeration system also includes a first refrigerant pump and a second refrigerant pump. The first refrigerant pump is arranged on the tenth refrigeration pipeline, and the second refrigerant pump is arranged on the twelfth refrigeration pipeline.

[0012] Among them, the multi-backup, high-fault-tolerance, multi-cold-source, and multi-mode refrigeration system also includes a condensing fan, and a condensing fan is arranged on one side of the air-cooled condenser.

[0013] Among them, the multi-backup high-fault-tolerance multi-cold source multi-mode refrigeration system also includes an air blower, and the air blower is arranged on one side of the liquid outlet pipe.

[0014] The refrigeration system of the present invention with multiple backups, high fault tolerance, multiple cold sources and multiple modes of operation adopts the liquid inlet pipe, the liquid outlet pipe, the ethylene glycol coil, the plate heat exchanger, the compressor, the evaporating coil, the liquid storage tank, the air-cooled condenser and the filter, and cooperates with pipelines and valve bodies to perform refrigeration operations in multiple modes and simultaneously meet the high reliability performance of the unit in different modes. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a structural schematic diagram of a refrigeration system with multiple backups, high fault tolerance, multiple cold sources and multiple modes of operation according to the present invention.

[0017] 1- compressor, 2- liquid storage tank, 3- evaporation coil, 4- glycol coil, 5- first refrigerant pump, 6- second refrigerant pump, 7- plate heat exchanger, 8- air-cooled condenser, 9- condensing fan, 10- blower, 11- first one-way valve, 12- second one-way valve, 13- third one-way valve, 14- fourth one-way valve, 15- fifth one-way valve, 16- sixth one-way valve, 17- seventh one-way valve, 21- first three-way valve, 22- second three-way valve, 23- third three-way valve, 24- fourth three-way valve, 30- four-way valve, 40- expansion valve, 50- first regulating valve, 60- second regulating valve, 71- filter, 100- liquid inlet pipe, 101- first connecting pipeline, 102- The second connecting pipeline, 103-the third connecting pipeline, 104-the fourth connecting pipeline, 105-the fifth connecting pipeline, 106-the sixth connecting pipeline, 107-the seventh connecting pipeline, 108-the first refrigeration pipeline, 109-the second refrigeration pipeline, 110-the third refrigeration pipeline, 111-the fourth refrigeration pipeline, 112-the fifth refrigeration pipeline, 113-the sixth refrigeration pipeline, 114-the seventh refrigeration pipeline, 115-the eighth refrigeration pipeline, 116-the ninth refrigeration pipeline, 117-the tenth refrigeration pipeline, 118-the eleventh refrigeration pipeline, 119-the twelfth refrigeration pipeline, 120-the thirteenth refrigeration pipeline, 121-the fourteenth refrigeration pipeline, 199-the eighth connecting pipeline, 200-the liquid outlet pipe. DETAILED DESCRIPTION

[0018] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0019] See also Figure 1 ,in Figure 1 It is a structural diagram of a refrigeration system with multiple backups, high fault tolerance, multiple cold sources and multiple modes of operation.

[0020] The present invention provides a refrigeration system with multiple backups, high fault tolerance, multiple cold sources and multiple modes of operation: comprising a liquid inlet pipe 100, a liquid outlet pipe 200, an ethylene glycol coil 4, a plate heat exchanger 7, a compressor 1, an evaporating coil 3, a liquid storage tank 2, an air-cooled condenser 8 and a filter 71, wherein the ethylene glycol coil 4 is respectively connected to the liquid inlet pipe 100 and the liquid outlet pipe 200, one end of the plate heat exchanger 7 is respectively connected to the liquid inlet pipe 100 and the liquid outlet pipe 200, the other end of the plate heat exchanger 7 is respectively connected to the compressor 1, the air-cooled condenser 8, the evaporating coil 3 and the liquid storage tank 2, the evaporating coil 3 is respectively connected to the liquid storage tank 2 and the compressor 1, and the filter 71 is arranged at the liquid inlet pipe 100.

[0021] In this embodiment, the liquid inlet pipe 100, the liquid outlet pipe 200, the ethylene glycol coil 4, the plate heat exchanger 7, the compressor 1, the evaporating coil 3, the liquid storage tank 2, the air-cooled condenser 8 and the filter 71 are used, and in conjunction with pipelines and valve bodies, multiple modes of refrigeration operation can be performed, and the high reliability performance of the unit in different modes can be met at the same time.

[0022] Furthermore, the multi-backup high fault tolerance multi-cold source multi-mode refrigeration system also includes a first connecting pipeline 101, a second connecting pipeline 102, a third connecting pipeline 103, a fourth connecting pipeline 104, a fifth connecting pipeline 105, a sixth connecting pipeline 106, a seventh connecting pipeline 107 and an eighth connecting pipeline 199, wherein the first connecting pipeline 101 is respectively connected to the liquid inlet pipe 100 and the fourth connecting pipeline 104, the fifth connecting pipeline 105 is respectively connected to the liquid inlet pipe 100 and the fourth connecting pipeline 104, The fourth connecting pipeline 104, the sixth connecting pipeline 106 and the plate heat exchanger 7 are connected, the seventh connecting pipeline 107 is respectively connected to the sixth connecting pipeline 106 and the plate heat exchanger 7, the eighth connecting pipeline 199 is respectively connected to the liquid outlet pipe 200, the sixth connecting pipeline 106 and the seventh connecting pipeline 107, and the third connecting pipeline 103 is respectively connected to the ethylene glycol coil 4, the fourth connecting pipeline 104 and the liquid outlet pipe 200.

[0023] Further, the multi-backup high fault tolerance multi-cold source multi-mode refrigeration system also includes a first refrigeration pipeline 108, a second refrigeration pipeline 109, a third refrigeration pipeline 110, a fourth refrigeration pipeline 111, a fifth refrigeration pipeline 112, a sixth refrigeration pipeline 113, a seventh refrigeration pipeline 114, an eighth refrigeration pipeline 115, a ninth refrigeration pipeline 116, a tenth refrigeration pipeline 117, an eleventh refrigeration pipeline 118, a twelfth refrigeration pipeline 119, a thirteenth refrigeration pipeline 120 and a fourteenth refrigeration pipeline 121, the first refrigeration pipeline 108 is respectively connected to the compressor 1, the second refrigeration pipeline 109 and the third refrigeration pipeline 110, the fourth refrigeration pipeline 111 and the fifth refrigeration pipeline 112 are respectively connected to the plate heat exchanger 7, the sixth refrigeration pipeline 113, the seventh refrigeration pipeline 114, the eighth refrigeration pipeline 115, the ninth refrigeration pipeline 116, the tenth refrigeration pipeline 117, the eleventh refrigeration pipeline 118, the twelfth refrigeration pipeline 119, the thirteenth refrigeration pipeline 120 and the fourteenth refrigeration pipeline 121, the first refrigeration pipeline 108 is respectively connected to the compressor 1, the second refrigeration pipeline 109 and the third refrigeration pipeline 110, the fourth refrigeration pipeline 111 and the fifth refrigeration pipeline 112 are respectively connected to the plate heat exchanger 7, the sixth refrigeration pipeline 116 The cold pipeline 113 is respectively connected to the third refrigeration pipeline 110, the eighth refrigeration pipeline 115 and the seventh refrigeration pipeline 114, the eighth refrigeration pipeline 115 is respectively connected to the ninth refrigeration pipeline 116, the fifth refrigeration pipeline 112 and the sixth refrigeration pipeline 113, the thirteenth refrigeration pipeline 120 is respectively connected to the evaporating coil 3, the tenth refrigeration pipeline 117, the eleventh refrigeration pipeline 118 and the twelfth refrigeration pipeline 119, the liquid storage tank 2 is respectively connected to the ninth refrigeration pipeline 116, the tenth refrigeration pipeline 117, the eleventh refrigeration pipeline 118 and the twelfth refrigeration pipeline 119, and the fourteenth refrigeration pipeline 121 is respectively connected to the evaporating coil 3, the compressor 1 and the second refrigeration pipeline 109.

[0024] Furthermore, the multi-backup, high-fault-tolerance, multi-cold-source, multi-mode refrigeration system also includes a first one-way valve 11, a second one-way valve 12, a third one-way valve 13, a fourth one-way valve 14, a fifth one-way valve 15, a sixth one-way valve 16 and a seventh one-way valve 17. The first one-way valve 11 is provided on the tenth refrigeration pipeline 117, the second one-way valve 12 is provided on the eleventh refrigeration pipeline 118, the third one-way valve 13 is provided on the twelfth refrigeration pipeline 119, the fourth one-way valve 14 is provided on the first refrigeration pipeline 108, the fifth one-way valve 15 is provided on the second refrigeration pipeline 109, the sixth one-way valve 16 is provided on the seventh connecting pipeline 107, and the seventh one-way valve 17 is provided between the eighth refrigeration pipeline 115 and the air-cooled condenser 8.

[0025] Furthermore, the multi-backup, high-fault-tolerance, multi-cold-source, multi-mode refrigeration system also includes a first three-way valve 21, a second three-way valve 22, a third three-way valve 23 and a fourth three-way valve 24. The first three-way valve 21 is arranged between the liquid inlet pipe 100, the first connecting pipeline 101 and the second connecting pipeline 102, the second three-way valve 22 is arranged between the third connecting pipeline 103 and the liquid outlet pipe 200, the third three-way valve 23 is arranged between the third refrigeration pipeline 110, the fourth refrigeration pipeline 111 and the sixth refrigeration pipeline 113, and the fourth three-way valve 24 is arranged between the fourth connecting pipeline 104, the fifth connecting pipeline 105 and the sixth connecting pipeline 106.

[0026] Furthermore, the multi-backup, high-fault-tolerance, multi-cold-source, multi-mode refrigeration system also includes a four-way valve 30, an expansion valve 40, a first regulating valve 50 and a second regulating valve 60. The four-way valve 30 is arranged between the eighth refrigeration pipeline 115, the seventh refrigeration pipeline 114, the sixth refrigeration pipeline 113 and the fifth refrigeration pipeline 112, the expansion valve 40 is arranged on the thirteenth refrigeration pipeline 120, the first regulating valve 50 is arranged on the third connecting pipeline 103, and the second regulating valve 60 is arranged on the seventh connecting pipeline 107.

[0027] Furthermore, the multi-backup, high-fault-tolerance, multi-cold-source, multi-mode refrigeration system also includes a first refrigerant pump 5 and a second refrigerant pump 6. The first refrigerant pump 5 is provided on the tenth refrigeration pipeline 117, and the second refrigerant pump 6 is provided on the twelfth refrigeration pipeline 119.

[0028] Furthermore, the multi-backup, high-fault-tolerance, multi-cold-source, and multi-mode refrigeration system further includes a condensing fan 9 , and a condensing fan 9 is disposed on one side of the air-cooled condenser 8 .

[0029] Furthermore, the multi-backup high-fault-tolerance multi-cold-source multi-mode refrigeration system further includes an air blower 10 , and the air blower 10 is disposed on one side of the liquid outlet pipe 200 .

[0030] In this embodiment, the liquid inlet pipe 100, the liquid outlet pipe 200, the ethylene glycol coil 4, the plate heat exchanger 7, the compressor 1, the evaporating coil 3, the liquid storage tank 2, the air-cooled condenser 8 and the filter 71 are used, and the pipeline and the valve body are matched to perform the following 13 working modes. The specific working process is as follows:

[0031] Working Mode 1:

[0032] This mode can work in summer or in seasons with high outdoor temperature. The low-temperature gaseous refrigerant is compressed by the compressor 1, enters the first refrigeration pipeline 108, the fourth one-way valve 14, and the third refrigeration pipeline 110, and then is controlled to be connected to the sixth refrigeration pipeline 113 by the third three-way valve 23, and then is controlled to be connected to the seventh refrigeration pipeline 114 by the four-way valve 30, and then enters the air-cooled condenser 8 for cooling. The condensing fan 9 adjusts the speed according to the condensing temperature to meet the heat dissipation load of the unit, and then reaches the seventh one-way valve 17. Then the refrigerant liquid passes through the ninth refrigeration pipeline 116 into the liquid storage tank 2, and then passes through the eleventh refrigeration pipeline 118, the second one-way valve 12, and the expansion valve 40 for throttling and pressure reduction to the thirteenth refrigeration pipeline 120, and then enters the evaporating coil 3, and then passes through the fourteenth refrigeration pipeline 121 to enter the compressor 1 for compression to complete a refrigeration cycle.

[0033] Working Mode 2:

[0034] This mode can work in summer or in seasons with high outdoor temperature. The low-temperature gaseous refrigerant is compressed by the compressor 1, enters the first refrigeration pipeline 108 and the third refrigeration pipeline 110, is connected to the fourth refrigeration pipeline 111 through the third three-way valve 23, enters the plate heat exchanger 7 for heat exchange, and then in the fifth refrigeration pipeline 112, is connected to the eighth refrigeration pipeline 115 and the ninth refrigeration pipeline 116 through the four-way valve 30 to enter the liquid storage tank 2, and then passes through the eleventh refrigeration pipeline 118, the second one-way valve 12, and the expansion valve 40 to throttle and reduce the pressure to the thirteenth refrigeration pipeline 120, and then enters the evaporating coil 3, and then passes through the fourteenth refrigeration pipeline 121 to enter the compressor 1 for compression to complete a refrigeration cycle.

[0035] At the same time, the low-temperature ethylene glycol liquid flows from the liquid inlet pipe 100, passes through the filter 71, and then is controlled by the first three-way valve 21 to be connected to the first connecting pipeline 101 and the fourth connecting pipeline 104, and then is controlled by the fourth three-way valve 24 to be connected to the fifth connecting pipeline 105, and enters the plate heat exchanger 7. The second regulating valve 60 adjusts the flow rate of ethylene glycol liquid to cool the refrigerant gas entering the plate heat exchanger 7 into a liquid state, and then passes through the sixth one-way valve 16, and finally passes through the seventh connecting pipeline 107, the eighth connecting pipeline 199 and the liquid outlet pipe 200 to complete the ethylene glycol circuit circulation, thereby improving the system energy efficiency.

[0036] Working Mode 3:

[0037] This mode can work in summer or in seasons with high outdoor temperature. The low-temperature gaseous refrigerant is compressed by the compressor 1, enters the first refrigeration pipeline 108, the fourth one-way valve 14, and the third refrigeration pipeline 110, is controlled to be connected to the fourth refrigeration pipeline 111 by the third three-way valve 23, enters the plate heat exchanger 7 for heat exchange, and then is controlled to be connected to the seventh refrigeration pipeline 114 by the four-way valve 30 in the fifth refrigeration pipeline 112, and then enters the air-cooled condenser 8. The condensing fan 9 adjusts the speed according to the condensing temperature to meet the heat dissipation load of the unit, and then reaches the seventh one-way valve 17. Then the refrigerant liquid passes through the ninth refrigeration pipeline 116 and enters the liquid storage tank 2, and then passes through the eleventh refrigeration pipeline 118, the second one-way valve 12, and the expansion valve 40 for throttling and pressure reduction to the thirteenth refrigeration pipeline 120, and then enters the evaporation coil 3, and then passes through the fourteenth refrigeration pipeline 121 to enter the compressor 1 for compression to complete a refrigeration cycle.

[0038] At the same time, the low-temperature ethylene glycol liquid flows from the liquid inlet pipe 100, passes through the filter 71, and is then controlled by the first three-way valve 21 to be connected to the first connecting pipeline 101 and the fourth connecting pipeline 104, and is then controlled by the fourth three-way valve 24 to be connected to the fifth connecting pipeline 105, and enters the plate heat exchanger 7. The second regulating valve 60 regulates the flow rate of ethylene glycol liquid to pre-cool the refrigerant gas entering the plate heat exchanger 7, and then passes through the sixth one-way valve 16, and finally passes through the seventh connecting pipeline 107, the eighth connecting pipeline 199, and the liquid outlet pipe 200 to complete the ethylene glycol circuit circulation, thereby improving the system energy efficiency.

[0039] Working Mode 4:

[0040] This mode can work in any season. The low-temperature ethylene glycol liquid flows from the liquid inlet pipe 100, passes through the filter 71, and then is controlled by the first three-way valve 21 to be connected to the second connecting pipe 102, enters the ethylene glycol coil 4, and then passes through the third connecting pipe 103. The first regulating valve 50 is used to adjust the ethylene glycol liquid flow to match the supply air temperature requirements under different indoor return air conditions. The opening of the first regulating valve 50 is adjusted according to the difference between the inlet temperature of ethylene glycol and the indoor return air temperature to meet the cooling demand of the unit, and then is connected to the liquid outlet pipe 200 through the second three-way valve 22 to complete the ethylene glycol circuit circulation.

[0041] Working Mode 5:

[0042] This mode can work when the indoor load is high and the outdoor temperature is high. The low-temperature gaseous refrigerant is compressed by the compressor 1, enters the first refrigeration pipeline 108, the fourth one-way valve 14, and the third refrigeration pipeline 110, and is controlled to be connected to the fourth refrigeration pipeline 111 by the third three-way valve 23, enters the plate heat exchanger 7 for heat exchange, and then in the fifth refrigeration pipeline 112, it is controlled to be connected to the seventh refrigeration pipeline 114 by the four-way valve 30, and then enters the air-cooled condenser 8. The condensing fan 9 adjusts the speed according to the condensing temperature to meet the heat dissipation load of the unit, and then reaches the seventh one-way valve 17. Then the refrigerant liquid passes through the ninth refrigeration pipeline 116 into the liquid storage tank 2, and then passes through the eleventh refrigeration pipeline 118, the second one-way valve 12, and the expansion valve 40 for throttling and pressure reduction to the thirteenth refrigeration pipeline 120, and then enters the evaporation coil 3, and then passes through the fourteenth refrigeration pipeline 121 to enter the compressor 1 for compression to complete a refrigeration cycle.

[0043] At the same time, the low-temperature ethylene glycol liquid flows from the liquid inlet pipe 100, passes through the filter 71, and is controlled by the first three-way valve 21 to be connected to the second connecting pipe 102, enters the ethylene glycol coil 4, passes through the third connecting pipe 103, and is adjusted by the first regulating valve 50 to match the supply air temperature requirements under different indoor return air conditions. The opening of the first regulating valve 50 is adjusted according to the difference between the inlet temperature of ethylene glycol and the indoor return air temperature to meet the refrigeration demand of the unit. Then, it is connected to the fourth connecting pipe 104 through the second three-way valve 22, and is controlled to be connected to the fifth connecting pipe 105 through the fourth three-way valve 24, and enters the plate heat exchanger 7. The ethylene glycol liquid flow is adjusted by the second regulating valve 60 to pre-cool the refrigerant gas entering the plate heat exchanger 7, and then passes through the sixth one-way valve 16 and finally through the seventh connecting pipe 107, the eighth connecting pipe 199, and the liquid outlet pipe 200 to complete the ethylene glycol circuit cycle, thereby improving the system energy efficiency.

[0044] Working Mode 6:

[0045] This mode can make the most of the outdoor cold source and can work under low outdoor temperature conditions. The refrigerant liquid passes through the ninth refrigeration pipeline 116 into the liquid storage tank 2, and then passes through the first refrigerant pump 5 or the second refrigerant pump 6 which are backed up by each other, and the corresponding tenth refrigeration pipeline 117 or the twelfth refrigeration pipeline 119, and the corresponding first check valve 11 or the third check valve 13 to the expansion valve 40 to adjust the superheat, and then passes through the thirteenth refrigeration pipeline 120 to enter the evaporation coil 3 for evaporation, and then passes through the fourteenth refrigeration pipeline 121, the fourteenth refrigeration pipeline 122, the fourteenth refrigeration pipeline 123, the fourteenth refrigeration pipeline 124, the fourteenth refrigeration pipeline 125, the fourteenth refrigeration pipeline 126, the fourteenth refrigeration pipeline 127, the fourteenth refrigeration pipeline 128, the fourteenth refrigeration pipeline 129, the fourteenth refrigeration pipeline 130, the fourteenth refrigeration pipeline 131, the fourteenth refrigeration pipeline 132, the fourteenth refrigeration pipeline 133, the fourteenth refrigeration pipeline 134, the fourteenth refrigeration pipeline 135, the fourteenth refrigeration pipeline 136, the fourteenth refrigeration pipeline 137, the fourteenth refrigeration pipeline 138, the fourteenth refrigeration pipeline 139, the fourteenth refrigeration pipeline 130, the fourteenth refrigeration pipeline 131, the fourteenth refrigeration pipeline 132, the fourteenth refrigeration pipeline 133, the fourteenth refrigeration pipeline The fifth one-way valve 15, the second refrigeration pipeline 109, the third refrigeration pipeline 110, to the third three-way valve 23, through the third three-way valve 23 control to connect the sixth refrigeration pipeline 113 to the four-way valve 30, and then through the four-way valve 30 control to connect to the seventh refrigeration pipeline 114, and then enter the air-cooled condenser 8, the condensing fan 9 adjusts the speed according to the condensing temperature to meet the heat dissipation load of the unit, to the seventh one-way valve 17, and then the refrigerant liquid passes through the ninth refrigeration pipeline 116 into the liquid storage tank 2, completing the fluorine pump refrigeration circuit cycle.

[0046] Working mode 7:

[0047] This mode can work under the condition of low outdoor temperature. The refrigerant liquid passes through the ninth refrigeration pipeline 116 and enters the liquid storage tank 2, and then passes through the first refrigerant pump 5 or the second refrigerant pump 6 which are backed up by each other, and the corresponding tenth refrigeration pipeline 117 or the twelfth refrigeration pipeline 119, and the corresponding first one-way valve 11 or the third one-way valve 13 to the expansion valve 40 to adjust the superheat, and then passes through the thirteenth refrigeration pipeline 120 to enter the evaporation coil 3 for evaporation, and then passes through the fourteenth refrigeration pipeline 121, the fifth one-way valve 15, the second refrigeration pipeline 109, the third refrigeration pipeline 110, to the third three-way valve 23, and is controlled by the third three-way valve 23 to be connected to the fourth refrigeration pipeline 111, enters the plate heat exchanger 7 for heat exchange, and then passes through the fifth refrigeration pipeline 112 through the four-way valve 30 to control the connection to the eighth refrigeration pipeline 115 and the ninth refrigeration pipeline 116 to enter the liquid storage tank 2, completing the fluorine pump refrigeration circuit cycle.

[0048] At the same time, the low-temperature ethylene glycol liquid flows from the liquid inlet pipe 100, passes through the filter 71, and is then controlled by the first three-way valve 21 to be connected to the first connecting pipeline 101 and the fourth connecting pipeline 104, and is then controlled by the fourth three-way valve 24 to be connected to the fifth connecting pipeline 105, and enters the plate heat exchanger 7. The second regulating valve 60 adjusts the flow rate of ethylene glycol liquid to cool the refrigerant entering the plate heat exchanger 7, and the ethylene glycol circuit circulation is completed through the seventh connecting pipeline 107, the eighth connecting pipeline 199, and the liquid outlet pipe 200, thereby improving the system energy efficiency.

[0049] Working Mode 8:

[0050] This mode can work under the condition of low outdoor temperature. The refrigerant liquid passes through the ninth refrigeration pipeline 116 and enters the liquid storage tank 2, and then passes through the first refrigerant pump 5 or the second refrigerant pump 6 which are backed up by each other, and the corresponding tenth refrigeration pipeline 117 or the twelfth refrigeration pipeline 119, and the corresponding first check valve 11 or the third check valve 13 to the expansion valve 40 to adjust the superheat, and then passes through the thirteenth refrigeration pipeline 120 to enter the evaporation coil 3 for evaporation, and then passes through the fourteenth refrigeration pipeline 121, the second refrigeration pipeline 109, and the fourteenth refrigeration pipeline 122. The third refrigeration pipeline 110 reaches the third three-way valve 23, is controlled to be connected to the fourth refrigeration pipeline 111 through the third three-way valve 23, enters the plate heat exchanger 7 for heat exchange, and then in the fifth refrigeration pipeline 112, is controlled to be connected to the seventh refrigeration pipeline 114 through the four-way valve 30, and then enters the air-cooled condenser 8. The condensing fan 9 adjusts the speed according to the condensing temperature to meet the heat dissipation load of the unit, reaches the seventh one-way valve 17, and then the refrigerant liquid passes through the ninth refrigeration pipeline 116 into the liquid storage tank 2, completing the fluorine pump refrigeration circuit cycle.

[0051] At the same time, the low-temperature ethylene glycol liquid flows from the liquid inlet pipe 100, passes through the filter 71, and is then controlled by the first three-way valve 21 to be connected to the first connecting pipeline 101 and the fourth connecting pipeline 104, and is then controlled by the fourth three-way valve 24 to be connected to the fifth connecting pipeline 105, and enters the plate heat exchanger 7. The second regulating valve 60 regulates the flow rate of ethylene glycol liquid to pre-cool the refrigerant entering the plate heat exchanger 7, and then passes through the seventh connecting pipeline 107, the eighth connecting pipeline 199, and the liquid outlet pipe 200 to complete the ethylene glycol circulation, thereby improving the system energy efficiency.

[0052] Working Mode 9:

[0053] This mode can work under the condition of low outdoor temperature and high indoor load. The refrigerant liquid passes through the ninth refrigeration pipeline 116 and enters the liquid storage tank 2, and then passes through the first refrigerant pump 5 or the second refrigerant pump 6 which are backed up by each other, and the corresponding tenth refrigeration pipeline 117 or the twelfth refrigeration pipeline 119, and the corresponding first check valve 11 or the third check valve 13 to the expansion valve 40 to adjust the superheat, and then passes through the thirteenth refrigeration pipeline 120 to enter the evaporation coil 3 for evaporation, and then passes through the fourteenth refrigeration pipeline 121, the fifth check valve 15, the second check valve 13, the expansion valve 40, the expansion valve 41, the expansion valve 42, the expansion valve 43, the expansion valve 44, the expansion valve 45, the expansion valve 46, the expansion valve 47, the expansion valve 48, the expansion valve 49, the expansion valve 50, the expansion valve 51, the expansion valve 52, the expansion valve 43, the expansion valve 44, the expansion valve 45, the expansion valve 46, the expansion valve 47, the expansion valve 48, the expansion valve 49, the expansion valve 40, the expansion valve 41 ...3, the expansion valve 44, the expansion valve 45, the expansion valve 46, the expansion valve 47, the expansion valve 48, the expansion valve 49, the expansion valve The cold pipeline 109, the third refrigeration pipeline 110, to the third three-way valve 23, is controlled by the third three-way valve 23 to be connected to the fourth refrigeration pipeline 111, enters the plate heat exchanger 7 for heat exchange, and then in the fifth refrigeration pipeline 112, is controlled by the four-way valve 30 to be connected to the seventh refrigeration pipeline 114, and then enters the air-cooled condenser 8. The condensing fan 9 adjusts the speed according to the condensing temperature to meet the heat dissipation load of the unit, and then reaches the seventh one-way valve 17. Then the refrigerant liquid passes through the ninth refrigeration pipeline 116 into the liquid storage tank 2 to complete the fluorine pump refrigeration circuit cycle.

[0054] At the same time, the low-temperature ethylene glycol liquid flows from the liquid inlet pipe 100, passes through the filter 71, and is controlled by the first three-way valve 21 to be connected to the second connecting pipe 102, enters the ethylene glycol coil 4, passes through the third connecting pipe 103, and is adjusted by the first regulating valve 50 to match the supply air temperature requirements under different indoor return air conditions. The opening of the first regulating valve 50 is adjusted according to the difference between the inlet temperature of ethylene glycol and the indoor return air temperature to meet the refrigeration demand of the unit. Then, it is connected to the fourth connecting pipe 104 through the second three-way valve 22, and is controlled by the fourth three-way valve 24 to be connected to the fifth connecting pipe 105 to enter the plate heat exchanger 7. The second regulating valve 60 regulates the ethylene glycol liquid flow rate to pre-cool the refrigerant entering the plate heat exchanger 7, and completes the ethylene glycol circuit circulation through the seventh connecting pipe 107, the eighth connecting pipe 199, and the liquid outlet pipe 200, thereby improving the system energy efficiency.

[0055] Working mode 10:

[0056] This mode can work in the transition season. The refrigerant liquid passes through the ninth refrigeration pipeline 116 and enters the liquid storage tank 2. Then, it passes through the first refrigerant pump 5 or the second refrigerant pump 6 which are backed up by each other, and the corresponding tenth refrigeration pipeline 117 or the twelfth refrigeration pipeline 119. The corresponding first check valve 11 or the third check valve 13 is used to adjust the superheat to the expansion valve 40. Then, it passes through the thirteenth refrigeration pipeline 120 and enters the evaporation coil 3 for evaporation. Then, it passes through the fourteenth refrigeration pipeline 121 to the compressor 1. The first refrigeration pipeline 108 and the third refrigeration pipeline 110 are connected to the third three-way valve 23, and are controlled by the third three-way valve 23 to be connected to the sixth refrigeration pipeline 113 to the four-way valve 30, and are then controlled by the four-way valve 30 to be connected to the seventh refrigeration pipeline 114, and then enter the air-cooled condenser 8. The condensing fan 9 adjusts the speed according to the condensing temperature to meet the heat dissipation load of the unit, and then reaches the seventh one-way valve 17. Then the refrigerant liquid passes through the ninth refrigeration pipeline 116 into the liquid storage tank 2 to complete the pressure pump refrigeration circuit cycle.

[0057] Working mode 11:

[0058] This mode can work in the transition season. The refrigerant liquid passes through the ninth refrigeration pipeline 116 and enters the liquid storage tank 2, and then passes through the first refrigerant pump 5 or the second refrigerant pump 6 which are backed up by each other, and the corresponding tenth refrigeration pipeline 117 or the twelfth refrigeration pipeline 119, and the corresponding first one-way valve 11 or the third one-way valve 13 to the expansion valve 40 to adjust the superheat, and then passes through the thirteenth refrigeration pipeline 120 to enter the evaporation coil 3 for evaporation, and then passes through the fourteenth refrigeration pipeline 121 to the compressor 1, through the first refrigeration pipeline 108 and the third refrigeration pipeline 110 to the third three-way valve 23, and is controlled by the third three-way valve 23 to be connected to the fourth refrigeration pipeline 111, and enters the plate heat exchanger 7 for heat exchange, and then in the fifth refrigeration pipeline 112, through the four-way valve 30, it is controlled to be connected to the eighth refrigeration pipeline 115 and the ninth refrigeration pipeline 116 to enter the liquid storage tank 2, completing the pressure pump refrigeration circuit cycle.

[0059] At the same time, the low-temperature ethylene glycol liquid flows from the liquid inlet pipe 100, passes through the filter 71, and is then controlled by the first three-way valve 21 to be connected to the first connecting pipeline 101 and the fourth connecting pipeline 104, and is then controlled by the fourth three-way valve 24 to be connected to the fifth connecting pipeline 105, and enters the plate heat exchanger 7. The second regulating valve 60 adjusts the flow rate of ethylene glycol liquid to cool the refrigerant entering the plate heat exchanger 7, and the ethylene glycol circuit circulation is completed through the seventh connecting pipeline 107, the eighth connecting pipeline 199, and the liquid outlet pipe 200, thereby improving the system energy efficiency.

[0060] Working Mode 12:

[0061] This mode can work in the transition season. The refrigerant liquid passes through the ninth refrigeration pipeline 116 and enters the liquid storage tank 2. Then, it passes through the first refrigerant pump 5 or the second refrigerant pump 6 which are backed up by each other, and the corresponding tenth refrigeration pipeline 117 or the twelfth refrigeration pipeline 119. The corresponding first check valve 11 or the third check valve 13 is used to adjust the superheat to the expansion valve 40. Then, it passes through the thirteenth refrigeration pipeline 120 and enters the evaporation coil 3 for evaporation. Then, it passes through the fourteenth refrigeration pipeline 121 to the compressor 1, and then passes through the first refrigeration pipeline 108. , the third refrigeration pipeline 110 is connected to the third three-way valve 23, and is controlled by the third three-way valve 23 to be connected to the fourth refrigeration pipeline 111, and enters the plate heat exchanger 7 for pre-cooling, and then in the fifth refrigeration pipeline 112, it is controlled by the four-way valve 30 to be connected to the seventh refrigeration pipeline 114, and then enters the air-cooled condenser 8, and the condensing fan 9 adjusts the speed according to the condensing temperature to meet the heat dissipation load of the unit, and then reaches the seventh one-way valve 17. Then the refrigerant liquid passes through the ninth refrigeration pipeline 116 into the liquid storage tank 2 to complete the pressure pump refrigeration circuit cycle.

[0062] At the same time, the low-temperature ethylene glycol liquid flows from the liquid inlet pipe 100, passes through the filter 71, and is then controlled by the first three-way valve 21 to be connected to the first connecting pipeline 101 and the fourth connecting pipeline 104, and is then controlled by the fourth three-way valve 24 to be connected to the fifth connecting pipeline 105, and enters the plate heat exchanger 7. The second regulating valve 60 regulates the flow rate of ethylene glycol liquid to pre-cool the refrigerant entering the plate heat exchanger 7, and then passes through the seventh connecting pipeline 107, the eighth connecting pipeline 199, and the liquid outlet pipe 200 to complete the ethylene glycol circulation, thereby improving the system energy efficiency.

[0063] Working mode 13:

[0064] This mode can work in transitional seasons and under high indoor load conditions. The refrigerant liquid passes through the ninth refrigeration pipeline 116 into the liquid storage tank 2, and then passes through the first refrigerant pump 5 or the second refrigerant pump 6 which are backed up by each other, and the corresponding tenth refrigeration pipeline 117 or the twelfth refrigeration pipeline 119, and the corresponding first check valve 11 or the third check valve 13 to the expansion valve 40 to adjust the superheat, and then passes through the thirteenth refrigeration pipeline 120 to enter the evaporation coil 3 for evaporation, and then passes through the fourteenth refrigeration pipeline 121 to the compressor 1, and is discharged through the first refrigeration pipeline 121. Pipeline 108, the third refrigeration pipeline 110 to the third three-way valve 23, is controlled by the third three-way valve 23 to be connected to the fourth refrigeration pipeline 111, enters the plate heat exchanger 7 for pre-cooling, and then in the fifth refrigeration pipeline 112, is controlled by the four-way valve 30 to be connected to the seventh refrigeration pipeline 114, and then enters the air-cooled condenser 8. The condensing fan 9 adjusts the speed according to the condensing temperature to meet the heat dissipation load of the unit, and then reaches the seventh one-way valve 17. Then the refrigerant liquid passes through the ninth refrigeration pipeline 116 into the liquid storage tank 2 to complete the pressure pump refrigeration circuit cycle.

[0065] At the same time, the low-temperature ethylene glycol liquid passes through the filter 71 from the liquid inlet pipe 100, and then is controlled by the first three-way valve 21 to be connected to the second connecting pipe 102, enters the ethylene glycol coil 4, passes through the third connecting pipe 103, and is adjusted by the first regulating valve 50 to match the supply air temperature requirements under different indoor return air conditions. The opening of the first regulating valve 50 is adjusted according to the difference between the inlet temperature of ethylene glycol and the indoor return air temperature to meet the refrigeration demand of the unit, and then is connected to the fourth connecting pipe 104 through the second three-way valve 22, and is controlled by the fourth three-way valve 24 to be connected to the fifth connecting pipe 105, and enters the plate heat exchanger 7. The ethylene glycol liquid flow is adjusted by the second regulating valve 60 to pre-cool the refrigerant entering the plate heat exchanger 7, and the ethylene glycol circuit circulation is completed through the seventh connecting pipe 107, the eighth connecting pipe 199, and the liquid outlet pipe 200, thereby improving the system energy efficiency.

[0066] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A refrigeration system with multiple backups, high fault tolerance, multiple cold sources and multiple modes, characterized in that: It includes a liquid inlet pipe, a liquid outlet pipe, an ethylene glycol coil, a plate heat exchanger, a compressor, an evaporating coil, a liquid storage tank, an air-cooled condenser and a filter. The ethylene glycol coil is respectively connected to the liquid inlet pipe and the liquid outlet pipe, one end of the plate heat exchanger is respectively connected to the liquid inlet pipe and the liquid outlet pipe, the other end of the plate heat exchanger is respectively connected to the compressor, the air-cooled condenser, the evaporating coil and the liquid storage tank, the evaporating coil is respectively connected to the liquid storage tank and the compressor, and the filter is arranged at the liquid inlet pipe.

2. The refrigeration system with multiple backups, high fault tolerance, multiple cold sources and multiple modes of operation according to claim 1, characterized in that: The multi-backup, high-fault-tolerance, multi-cold-source, multi-mode refrigeration system also includes a first connecting pipeline, a second connecting pipeline, a third connecting pipeline, a fourth connecting pipeline, a fifth connecting pipeline, a sixth connecting pipeline, a seventh connecting pipeline and an eighth connecting pipeline. The first connecting pipeline is respectively connected to the liquid inlet pipe and the fourth connecting pipeline, the fifth connecting pipeline is respectively connected to the fourth connecting pipeline, the sixth connecting pipeline and the plate heat exchanger, the seventh connecting pipeline is respectively connected to the sixth connecting pipeline and the plate heat exchanger, the eighth connecting pipeline is respectively connected to the liquid outlet pipe, the sixth connecting pipeline and the seventh connecting pipeline, and the third connecting pipeline is respectively connected to the ethylene glycol coil, the fourth connecting pipeline and the liquid outlet pipe.

3. The refrigeration system with multiple backups, high fault tolerance, multiple cold sources and multiple modes of operation as claimed in claim 2, characterized in that: The multi-backup high-fault-tolerance multi-cold source multi-mode refrigeration system also includes a first refrigeration pipeline, a second refrigeration pipeline, a third refrigeration pipeline, a fourth refrigeration pipeline, a fifth refrigeration pipeline, a sixth refrigeration pipeline, a seventh refrigeration pipeline, an eighth refrigeration pipeline, a ninth refrigeration pipeline, a tenth refrigeration pipeline, an eleventh refrigeration pipeline, a twelfth refrigeration pipeline, a thirteenth refrigeration pipeline and a fourteenth refrigeration pipeline, the first refrigeration pipeline is respectively connected to the compressor, the second refrigeration pipeline and the third refrigeration pipeline, the fourth refrigeration pipeline and the fifth refrigeration pipeline are respectively connected to the plate heat exchanger, the sixth refrigeration pipeline The third refrigeration pipeline is respectively connected to the eighth refrigeration pipeline and the seventh refrigeration pipeline, the eighth refrigeration pipeline is respectively connected to the ninth refrigeration pipeline, the fifth refrigeration pipeline and the sixth refrigeration pipeline, the thirteenth refrigeration pipeline is respectively connected to the evaporating coil, the tenth refrigeration pipeline, the eleventh refrigeration pipeline and the twelfth refrigeration pipeline, the liquid storage tank is respectively connected to the ninth refrigeration pipeline, the tenth refrigeration pipeline, the eleventh refrigeration pipeline and the twelfth refrigeration pipeline, and the fourteenth refrigeration pipeline is respectively connected to the evaporating coil, the compressor and the second refrigeration pipeline.

4. The refrigeration system with multiple backups, high fault tolerance, multiple cold sources and multiple modes of operation as claimed in claim 3, characterized in that: The multi-backup, high-fault-tolerance, multi-cold-source, multi-mode refrigeration system also includes a first one-way valve, a second one-way valve, a third one-way valve, a fourth one-way valve, a fifth one-way valve, a sixth one-way valve and a seventh one-way valve. The first one-way valve is arranged on the tenth refrigeration pipeline, the second one-way valve is arranged on the eleventh refrigeration pipeline, the third one-way valve is arranged on the twelfth refrigeration pipeline, the fourth one-way valve is arranged on the first refrigeration pipeline, the fifth one-way valve is arranged on the second refrigeration pipeline, the sixth one-way valve is arranged on the seventh connecting pipeline, and the seventh one-way valve is arranged between the eighth refrigeration pipeline and the air-cooled condenser.

5. The refrigeration system with multiple backups, high fault tolerance, multiple cold sources and multiple modes of operation as claimed in claim 3, characterized in that: The multi-backup, high-fault-tolerance, multi-cold-source, multi-mode refrigeration system also includes a first three-way valve, a second three-way valve, a third three-way valve, and a fourth three-way valve. The first three-way valve is arranged between the liquid inlet pipe, the first connecting pipeline, and the second connecting pipeline, the second three-way valve is arranged between the third connecting pipeline and the liquid outlet pipe, the third three-way valve is arranged between the third refrigeration pipeline, the fourth refrigeration pipeline, and the sixth refrigeration pipeline, and the fourth three-way valve is arranged between the fourth connecting pipeline, the fifth connecting pipeline, and the sixth connecting pipeline.

6. The refrigeration system with multiple backups, high fault tolerance, multiple cold sources and multiple modes of operation as claimed in claim 3, characterized in that: The multi-backup, high-fault-tolerance, multi-cold-source, multi-mode refrigeration system also includes a four-way valve, an expansion valve, a first regulating valve, and a second regulating valve. The four-way valve is arranged between the eighth refrigeration pipeline, the seventh refrigeration pipeline, the sixth refrigeration pipeline, and the fifth refrigeration pipeline. The expansion valve is arranged on the thirteenth refrigeration pipeline, the first regulating valve is arranged on the third connecting pipeline, and the second regulating valve is arranged on the seventh connecting pipeline.

7. The refrigeration system with multiple backups, high fault tolerance, multiple cold sources and multiple modes of operation as claimed in claim 3, characterized in that: The multi-backup, high-fault-tolerance, multi-cold-source, multi-mode refrigeration system also includes a first refrigerant pump and a second refrigerant pump. The first refrigerant pump is provided on the tenth refrigeration pipeline, and the second refrigerant pump is provided on the twelfth refrigeration pipeline.

8. The refrigeration system with multiple backups, high fault tolerance, multiple cold sources and multiple modes of operation according to claim 1, characterized in that: The multi-backup, high-fault-tolerance, multi-cold-source, multi-mode refrigeration system further includes a condensing fan, and a condensing fan is provided on one side of the air-cooled condenser.

9. The refrigeration system with multiple backups, high fault tolerance, multiple cold sources and multiple modes of operation according to claim 1, characterized in that: The multi-backup, high-fault-tolerance, multi-cold-source, multi-mode refrigeration system further includes an air blower, and an air blower is disposed on one side of the liquid outlet pipe.

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