A constant temperature and humidity air conditioning unit with rapid dehumidification structure and working method thereof

Abstract

A constant temperature and humidity air conditioning unit with a rapid dehumidification structure and a working method thereof, belonging to the technical field of air conditioning, comprises a compressor, a refrigeration device structure, a throttling device, an evaporator, an indoor air blower, a refrigerant passage, and a diversion tee; the refrigerant passage comprises a refrigerant passage A, a refrigerant passage B, a refrigerant passage C, a refrigerant passage D, and a refrigerant passage E; the evaporator comprises an upper evaporator and a lower evaporator; a refrigerant connecting pipe is arranged at the outlet end of the evaporator, and a check valve is arranged in the middle of the refrigerant connecting pipe; the throttling device comprises an electronic expansion valve A and an electronic expansion valve B; a solenoid valve A is arranged on the refrigerant passage D from the diversion tee to the electronic expansion valve A, and a solenoid valve B is arranged on the refrigerant passage E from the diversion tee to the electronic expansion valve B. The beneficial effects of the present invention are: simple structure, good dehumidification effect, no ice and frost, effective prevention of ice and frost caused by too low evaporation temperature, and meeting the requirements of rapid dehumidification.

Description

Technical Field

[0001] The present invention relates to a constant temperature and humidity air conditioning unit and a working method thereof, and in particular to a constant temperature and humidity air conditioning unit with a rapid dehumidification structure and a working method thereof, belonging to the technical field of air conditioning. Background Art

[0002] The dehumidification principle of air conditioners is that moisture in the air will condense into water when it is cooled. When the refrigerant in the air conditioner's evaporator evaporates, it absorbs a lot of heat, which greatly reduces the surface temperature of the evaporator. This causes the water vapor in the indoor air to liquefy into water when it is cooled. This condensed water will flow through the outlet pipe and be discharged outdoors, so that part of the moisture in the room air is removed in this way.

[0003] At present, the dehumidification method of constant temperature and humidity machines is full-cold refrigeration dehumidification. In this dehumidification process, the evaporation temperature of the evaporator is high and the dehumidification capacity is small, and a large amount of refrigeration capacity is used to cool the air. When the temperature is already stable, full-cold dehumidification will inevitably require a large amount of reheating electric heating to stabilize the temperature. This operation cannot provide fast dehumidification. And the use of reheating electric heating consumes a lot of energy. In conventional refrigeration operation, the latent cooling capacity of constant temperature and humidity air conditioning units for dehumidification is very low, at 20-30%, and that of computer room air conditioners is 5-9%.

[0004] The patent application with the publication number of CN 103968619 A and the application number of 2013100410196 and the invention name of "Air conditioner with rapid dehumidification" adds a heat exchanger, which is arranged on the first refrigerant passage and the second refrigerant passage, and can perform a second cooling to achieve the purpose of rapid dehumidification. The patent application of "Air conditioner with rapid dehumidification" adds a heat exchanger, which makes the overall structure complicated, increases the product volume and cost, and is not conducive to market sales competition. Summary of the invention

[0005] The purpose of the present invention is to provide a constant temperature and humidity air-conditioning unit with a rapid dehumidification structure to address the defects of the above-mentioned prior art, such as the inability to provide rapid dehumidification, complex structure, excessive size and increased cost. The present invention can achieve the purpose of simple structure, good dehumidification effect, no ice and frost, and effective prevention of ice and frost caused by too low evaporation temperature, while meeting the requirements of rapid dehumidification.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a constant temperature and humidity air-conditioning unit with a rapid dehumidification structure, comprising a compressor, a condenser structure, a throttling device, an evaporator, an indoor air blower and a refrigerant passage, wherein the indoor air blower is arranged above the evaporator; the compressor, the throttling device and the evaporator constitute an indoor unit, the condenser structure comprises an outdoor heat exchanger and an outdoor heat dissipation fan arranged outside the outdoor heat exchanger, and the outdoor heat exchanger and the outdoor heat dissipation fan constitute an outdoor unit; the compressor comprises a compressor suction end and a compressor outlet end, and the outdoor heat exchanger comprises a heat exchanger inlet end and a heat exchanger outlet end; the refrigerant passage comprises a refrigerant passage A and a refrigerant passage B, from the outlet end of the evaporator to the suction end of the compressor, connected by the refrigerant passage A, from the outlet end of the compressor to the inlet end of the heat exchanger, connected by the refrigerant passage B;

[0007] It also includes a flow dividing tee, which is arranged in front of the throttling device and the evaporator; the evaporator includes an upper evaporator and a lower evaporator, a partition is arranged between the upper evaporator and the lower evaporator, the upper evaporator and the lower evaporator are arranged in a stacked manner through the partition, and the upper evaporator and the lower evaporator are symmetrical with the partition as the center;

[0008] A refrigerant connecting pipe is provided at the air outlet of the evaporator, a one-way valve is provided in the middle of the refrigerant connecting pipe, and the one-way valve divides the refrigerant connecting pipe into an upper half of the refrigerant connecting pipe and a lower half of the refrigerant connecting pipe. The upper half of the refrigerant connecting pipe is connected to the air outlet of the upper evaporator, and the lower half of the refrigerant connecting pipe is connected to the air outlet of the lower evaporator.

[0009] The throttling device comprises an electronic expansion valve A and an electronic expansion valve B, wherein the electronic expansion valve A is arranged at the inlet end of the upper evaporator, and the electronic expansion valve B is arranged at the inlet end of the lower evaporator;

[0010] The refrigerant passage also includes a refrigerant passage C, a refrigerant passage D and a refrigerant passage E; from the outlet of the heat exchanger to the diverter tee, connected by the refrigerant passage C, from the diverter tee to the electronic expansion valve A, connected by the refrigerant passage D, from the diverter tee to the electronic expansion valve B, connected by the refrigerant passage E, the refrigerant passage D and the refrigerant passage E are in parallel relationship;

[0011] A solenoid valve A is provided on the refrigerant passage D from the diverter tee to the electronic expansion valve A, and a solenoid valve B is provided on the refrigerant passage E from the diverter tee to the electronic expansion valve B.

[0012] The outdoor heat exchanger includes copper tubes and aluminum fins. The outdoor heat exchanger is made by mechanical expansion of copper tubes in series with aluminum fins. The inner and outer rings are expanded and then assembled together and bent into shape. After the outdoor heat exchanger is made, an air tightness test is performed at a pressure of 4.3Mpa and a fin spacing of 1.7mm.

[0013] A stop valve A and a stop valve B are provided on the refrigerant passage B from the air outlet of the compressor to the air inlet of the heat exchanger, wherein the stop valve A is indoors and the stop valve B is outdoors; a stop valve C and a stop valve D are provided on the refrigerant passage C from the outlet of the heat exchanger to the diversion tee, wherein the stop valve C is outdoors and the stop valve D is indoors; the product models of the stop valve A and the stop valve B are both FJ16JK-3-NBHK-00, and the product models of the stop valve C and the stop valve D are both FJ13JK-3-NBHK-00.

[0014] The product model of the compressor is ZR144KC-TFP, the product model of the outdoor cooling fan is DS760C-190B4.EC, the product model of the diversion tee is a 16T equal-diameter copper tee, the product models of the electronic expansion valve A and the electronic expansion valve B are both DPF(S03)4.0C-01, and the product models of the solenoid valve A and the solenoid valve B are both 200RB7T7.

[0015] An oil separator is provided on the refrigerant passage B, between the compressor suction end at the heat exchanger outlet and the stop valve A. The oil separator separates the lubricating oil in the high-temperature and high-pressure refrigerant gas discharged from the compressor to ensure safe and efficient operation of the device; the product model of the oil separator is Emerson oil separator AW55877.

[0016] A liquid accumulator is provided on the refrigerant passage C, between the suction end of the compressor and the stop valve C. The liquid accumulator can play the role of refrigerant buffer and protect the compressor. The product model of the liquid accumulator is liquid accumulator CYQ-4.2.

[0017] A drying filter is arranged on the refrigerant passage C, between the stop valve D and the diversion tee, and the drying filter can filter impurities and purify the refrigerant medium. The product model of the drying filter is the drying filter EK-165S.

[0018] A gas-liquid separator is arranged on the refrigerant passage A, from the gas outlet of the evaporator to the air intake of the compressor. The function of the gas-liquid separator is to process the gas containing a small amount of condensate to realize the gas phase purification of the low-temperature and low-pressure refrigerant gas flowing from the gas outlet of the evaporator to the air intake of the compressor. The product model of the gas-liquid separator is gas-liquid separator QFQ-5.0.

[0019] A working method of a constant temperature and humidity air conditioning unit with a rapid dehumidification structure includes three working modes:

[0020] (1) Working mode 1, i.e., the working mode of using the lower half of the evaporator for rapid dehumidification: stop valve A, stop valve B, stop valve C and stop valve D are open, solenoid valve A and electronic expansion valve A are open, and solenoid valve B and electronic expansion valve B are closed;

[0021] The compressor starts, and the compressor compresses the low-temperature and low-pressure refrigerant gas input from the compressor evaporator into high-temperature and high-pressure refrigerant gas. The high-temperature and high-pressure refrigerant gas is discharged from the compressor outlet, along the refrigerant path B, and passes through the oil separator to separate the lubricating oil in the high-temperature and high-pressure refrigerant gas discharged from the compressor; the high-temperature and high-pressure refrigerant gas then passes through the stop valve A and the stop valve B, enters the heat exchanger from the heat exchanger inlet end, becomes a normal temperature and high-pressure refrigerant liquid, and is discharged from the heat exchanger outlet end; at the same time, the heat is discharged to the outdoor air environment through the forced convection of the outdoor heat dissipation fan;

[0022] The refrigerant liquid at room temperature and high pressure continues to flow forward along the refrigerant path B, passes through the liquid storage tank, and makes the refrigerant have a buffering effect; then passes through the refrigeration pressure switch that can play a role in pressure control and protection, and flows forward through the stop valve C and stop valve D, flows through the dry filter, filters out impurities in the refrigerant liquid, and then flows forward to reach the diversion tee;

[0023] The normal temperature and high pressure refrigerant liquid flows downward from the flow divider tee, along the refrigerant passage D, through the solenoid valve A, and reaches the electronic expansion valve A, where it is throttled and depressurized to become a low temperature and low pressure refrigerant liquid; then, the low temperature and low pressure refrigerant liquid enters the lower evaporator, absorbs heat from the air in about 1 / 2 of the area of ​​the evaporator, and lowers the air temperature even lower, close to 0°C, and the low temperature and low pressure refrigerant liquid becomes a low temperature and low pressure refrigerant gas; at the same time, the cold air is discharged into the indoor air environment through the forced convection of the indoor blower;

[0024] Since the evaporator area is small, the temperature of the refrigerant in the evaporator is low, so the temperature of the air passing through the 1 / 2 evaporator used for dehumidification is lower, and more water in the air is condensed; for units with a rapid dehumidification structure, according to actual test results, about 50% is used for dehumidification according to constant temperature and humidity design data, and 40% is used for dehumidification according to computer room air conditioning. The rapid dehumidification mode can achieve the best dehumidification effect;

[0025] Finally, the low-temperature and low-pressure refrigerant gas flows from the lower part of the refrigerant connecting pipe, through the outlet end of the evaporator, along the refrigerant passage A, enters from the suction end of the compressor, and returns to the compressor; in this way, it circulates continuously to achieve the purpose of indoor cooling and rapid dehumidification;

[0026] (2) Working mode 2, i.e., the working mode of using the upper part of the evaporator for rapid dehumidification: stop valve A, stop valve B, stop valve C and stop valve D are open, solenoid valve A and electronic expansion valve A are closed, and solenoid valve B and electronic expansion valve B are open;

[0027] The refrigerant liquid at room temperature and high pressure flows upward from the flow divider tee, along the refrigerant passage E, through the solenoid valve B, and reaches the electronic expansion valve B, where it is throttled and depressurized to become a refrigerant liquid at low temperature and low pressure. Then, the refrigerant liquid at low temperature and low pressure enters the upper evaporator, where it absorbs heat from the air in about 1 / 2 of the area of ​​the evaporator, lowering the air temperature even lower to close to 0°C, and the refrigerant liquid at low temperature and low pressure becomes a refrigerant gas at low temperature and low pressure.

[0028] Finally, the low-temperature and low-pressure refrigerant gas flows from the upper part of the refrigerant connecting pipe downward through the one-way valve to the lower part of the refrigerant connecting pipe, then passes through the outlet end of the evaporator, along the refrigerant path A, enters from the suction end of the compressor, and returns to the compressor;

[0029] Same working mode as 1;

[0030] (3) Working mode 3, using the upper and lower parts of the evaporator for full cooling and dehumidification at the same time: stop valve A, stop valve B, stop valve C and stop valve D are opened, and solenoid valve A, electronic expansion valve A, solenoid valve B and electronic expansion valve B are opened at the same time;

[0031] The normal temperature and high pressure refrigerant liquid is divided into two parts. One part of the normal temperature and high pressure refrigerant liquid flows downward from the diversion tee, along the refrigerant passage D, through the solenoid valve A, and reaches the electronic expansion valve A, where it is throttled and depressurized to become a low temperature and low pressure refrigerant liquid. Then, the low temperature and low pressure refrigerant liquid enters the lower evaporator, where the evaporator absorbs heat from the air over the entire area, lowering the air temperature. The low temperature and low pressure refrigerant liquid becomes a low temperature and low pressure refrigerant gas, and flows to the lower half of the refrigerant connecting pipe.

[0032] Another part of the refrigerant liquid at room temperature and high pressure flows upward from the flow dividing tee, along the refrigerant passage E, through the solenoid valve B, and reaches the electronic expansion valve B, where it is throttled and depressurized to become a refrigerant liquid at low temperature and low pressure; then, the refrigerant liquid at low temperature and low pressure enters the upper evaporator, where it absorbs heat from the air within the entire area of ​​the evaporator to lower the air temperature; the refrigerant liquid at low temperature and low pressure becomes a refrigerant gas at low temperature and low pressure; then, the refrigerant gas at low temperature and low pressure flows downward from the upper part of the refrigerant connecting pipe through the one-way valve to the lower part of the refrigerant connecting pipe, and then mixes with the refrigerant liquid at room temperature and high pressure that has flowed from the lower evaporator to the lower part of the refrigerant connecting pipe, and then passes through the gas outlet of the evaporator, along the refrigerant passage A, enters from the suction end of the compressor, and returns to the compressor;

[0033] In working mode 3, the temperature is reduced to the dew point of water in the air, and condensed water is crystallized on the surface of the indoor evaporator to achieve the purpose of dehumidification; at this time, the evaporator area is large, and according to the constant temperature and humidity design data, about 20-30% is used for dehumidification, and according to the computer room air conditioner, 5-10% is used for dehumidification; therefore, the dehumidification effect is very limited in the full cooling mode;

[0034] The rest is the same as working mode 1.

[0035] Rapid dehumidification uses 2 solenoid valves and 2 electronic expansion valves for shunt control. When running rapid dehumidification, 2 solenoid valves and 2 electronic expansion valves are used for shunt control. The lower half of the evaporator can also be used. The refrigerant in rapid dehumidification operates at an evaporation temperature below 0°C. If it runs in this mode for a long time, water droplets on the evaporator panel are prone to frost and ice. This structure allows the upper and lower parts of the evaporator to be used alternately, which can prevent the occurrence of frost and ice on the evaporator panel and meet the requirements of rapid dehumidification.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] (1) The structure is simple. The main components related to the refrigeration and dehumidification structure of the entire constant temperature and humidity air-conditioning unit only have a diversion tee. The evaporator is divided into two parts, the upper evaporator and the lower evaporator, through a partition. A solenoid valve and an electronic expansion valve are respectively set in front of the upper evaporator and the lower evaporator. The dual control of the solenoid valve and the electronic expansion valve is used to change the heat exchange area and reduce the evaporation temperature to achieve the purpose of rapid dehumidification.

[0038] (2) The dehumidification effect is good. The present invention adopts a rapid dehumidification structure. The latent cooling capacity of the constant temperature and humidity air-conditioning unit for dehumidification is increased from the original 20-30% to more than 50%, and the latent cooling capacity of the computer room air-conditioning is increased from the original 5-9% to more than 40%;

[0039] (3) No ice or frost will be generated. By changing the heat exchange area structure according to the dehumidification situation, the upper and lower evaporators can be used as backup and run alternately, which can effectively prevent the evaporation temperature from being too low and causing ice and frost, while meeting the requirements of rapid dehumidification. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is: a schematic diagram of the structure of the present invention;

[0041] Figure 2 yes: Figure 1 A magnified view of part A;

[0042] Figure 3 Yes: A magnified front view of the outdoor heat exchanger structure;

[0043] Figure 4 Yes: In working mode 1, the combined structure and working principle diagram of the diverter tee, throttling device and evaporator;

[0044] Figure 5 Yes: In working mode 2, the combined structure and working principle diagram of the diverter tee, throttling device and evaporator;

[0045] Figure 6 Yes: In working mode 3, the combined structure and working principle diagram of the diverter tee, throttling device and evaporator.

[0046] Description of the reference numerals: compressor 1, compressor suction end 101, compressor outlet end 102, condenser structure 2, outdoor heat exchanger 201, copper tube 20101, aluminum fin 20102, outdoor cooling fan 202, heat exchanger inlet end 203, heat exchanger outlet end 204, throttling device 3, electronic expansion valve A 301, electronic expansion valve B 302, evaporator 4, upper evaporator 401, lower evaporator 402, partition 403, indoor air supply fan 5, refrigerant passage 6, refrigerant passage A 601, refrigerant passage B 602, refrigerant passage C 603, refrigerant passage D 604, refrigerant passage E 605, diversion tee 7, refrigerant connecting pipe 8, one-way valve 9, solenoid valve A 10, solenoid valve B 11, stop valve A 12, stop valve B 13, stop valve C 14, stop valve D 15. Oil separator 16. Liquid storage tank 17. Dry filter 18. Gas-liquid separator 19. DETAILED DESCRIPTION

[0047] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0048] like Figures 1 to 6 As shown, a constant temperature and humidity air conditioning unit with a rapid dehumidification structure includes a compressor 1, a condenser structure 2, a throttling device 3, an evaporator 4, an indoor air blower 5 and a refrigerant passage 6, wherein the indoor air blower 5 is arranged above the evaporator 4; the compressor 1, the throttling device 3 and the evaporator 4 constitute an indoor unit, the condenser structure 2 includes an outdoor heat exchanger 201 and an outdoor heat dissipation fan 202 arranged outside the outdoor heat exchanger 201, and the outdoor heat exchanger 201 and the outdoor heat dissipation fan 202 constitute an outdoor unit; the compressor 1 includes a compressor suction end 101 and a compressor outlet end 102, and the outdoor heat exchanger 201 includes a heat exchanger inlet end 203 and a heat exchanger outlet end 204; the refrigerant passage 6 includes a refrigerant passage A 601 and a refrigerant passage B 602, from the outlet end of the evaporator 4 to the compressor suction end 101, with the refrigerant passage A 601 and the refrigerant passage B 602. 601 connection, from the compressor outlet end 102 to the heat exchanger inlet end 203, connected by a refrigerant passage B 602;

[0049] The evaporator 4 further comprises a flow dividing tee 7, which is arranged in front of the throttling device 3 and the evaporator 4; the evaporator 4 comprises an upper evaporator 401 and a lower evaporator 402, a partition 403 is arranged between the upper evaporator 401 and the lower evaporator 402, the upper evaporator 401 and the lower evaporator 402 are arranged in a stacked manner through the partition 403, and the upper evaporator 401 and the lower evaporator 402 are symmetrical with the partition 403 as the center;

[0050] A refrigerant connecting pipe 8 is provided at the air outlet end of the evaporator 4, and a one-way valve 9 is provided in the middle of the refrigerant connecting pipe 8. The one-way valve 9 divides the refrigerant connecting pipe 8 into an upper half of the refrigerant connecting pipe 8 and a lower half of the refrigerant connecting pipe 8. The upper half of the refrigerant connecting pipe 8 is connected to the air outlet end of the upper evaporator 401, and the lower half of the refrigerant connecting pipe 8 is connected to the air outlet end of the lower evaporator 402.

[0051] The throttling device 3 includes an electronic expansion valve A 301 and an electronic expansion valve B 302, wherein the electronic expansion valve A 301 is arranged at the inlet end of the upper evaporator 401, and the electronic expansion valve B 302 is arranged at the inlet end of the lower evaporator 402;

[0052] The refrigerant passage 6 also includes a refrigerant passage C 603, a refrigerant passage D 604 and a refrigerant passage E 605; from the heat exchanger outlet 204 to the diverter tee 7, connected by the refrigerant passage C 603, from the diverter tee 7 to the electronic expansion valve A 301, connected by the refrigerant passage D 604, from the diverter tee 7 to the electronic expansion valve B 302, connected by the refrigerant passage E 605, the refrigerant passage D 604 and the refrigerant passage E 605 are in parallel relationship;

[0053] A solenoid valve A10 is provided on the refrigerant passage D604 from the diverter tee 7 to the electronic expansion valve A301, and a solenoid valve B11 is provided on the refrigerant passage E605 from the diverter tee 7 to the electronic expansion valve B302.

[0054] The outdoor heat exchanger 201 includes a copper tube 20101 and an aluminum fin 20102. The outdoor heat exchanger 201 is made by mechanically expanding the copper tube 20101 in series with the aluminum fin 20102. The inner and outer rings are expanded and then assembled together and bent into shape. After the outdoor heat exchanger 201 is made, an air tightness test is performed, the pressure is 4.3Mpa, and the fin spacing is 1.7mm.

[0055] A stop valve A12 and a stop valve B13 are provided on the refrigerant passage B602 from the compressor outlet end 102 to the heat exchanger inlet end 203, wherein the stop valve A12 is indoors and the stop valve B13 is outdoors; a stop valve C14 and a stop valve D15 are provided on the refrigerant passage C603 from the heat exchanger outlet end 204 to the diversion tee 7, wherein the stop valve C14 is outdoors and the stop valve D15 is indoors; the product models of the stop valve A12 and the stop valve B13 are both FJ16JK-3-NBHK-00, and the product models of the stop valve C14 and the stop valve D15 are both FJ13JK-3-NBHK-00.

[0056] The product model of the compressor 1 is ZR144KC-TFP, the product model of the outdoor cooling fan 202 is DS760C-190B4.EC, the product model of the diverter tee 7 is a 16T-type equal-diameter copper tee, the product models of the electronic expansion valve A301 and the electronic expansion valve B302 are both DPF(S03)4.0C-01, and the product models of the solenoid valve A10 and the solenoid valve B11 are both 200RB7T7.

[0057] An oil separator 16 is provided on the refrigerant passage B 602, between the heat exchanger outlet end 204, the compressor suction end 101 and the stop valve A 12, and the oil separator 16 separates the lubricating oil in the high-temperature and high-pressure refrigerant gas discharged from the compressor 1 to ensure safe and efficient operation of the device; the product model of the oil separator 16 is Emerson oil separator AW55877.

[0058] A liquid accumulator 17 is provided on the refrigerant passage C 603, between the compressor suction end 101 and the stop valve C 14. The liquid accumulator 17 can play a role of refrigerant buffer and protect the compressor 1. The product model of the liquid accumulator 17 is CYQ-4.2.

[0059] A drying filter 18 is provided on the refrigerant passage C 603, between the stop valve D 15 and the diverting tee 7. The drying filter 18 can filter impurities and purify the refrigerant medium. The product model of the drying filter 18 is EK-165S.

[0060] A gas-liquid separator 19 is provided on the refrigerant passage A 601, from the gas outlet of the evaporator 4 to the compressor suction end 101. The function of the gas-liquid separator 19 is to process the gas containing a small amount of condensate to achieve gas phase purification of the low-temperature and low-pressure refrigerant gas flowing from the gas outlet of the evaporator 4 to the compressor suction end 101. The product model of the gas-liquid separator 19 is QFQ-5.0.

[0061] A working method of a constant temperature and humidity air conditioning unit with a rapid dehumidification structure includes three working modes:

[0062] (1) Working mode 1, i.e., the working mode of using the lower half of the evaporator 4 for rapid dehumidification: the stop valve A12, the stop valve B13, the stop valve C14 and the stop valve D15 are opened, the solenoid valve A10 and the electronic expansion valve A301 are opened, and the solenoid valve B11 and the electronic expansion valve B302 are closed;

[0063] The compressor 1 is started, and the compressor 1 compresses the low-temperature and low-pressure refrigerant gas input from the evaporator 4 of the compressor 1 into a high-temperature and high-pressure refrigerant gas. The high-temperature and high-pressure refrigerant gas is discharged from the compressor outlet 102, along the refrigerant path B602, and passes through the oil separator 16 to separate the lubricating oil in the high-temperature and high-pressure refrigerant gas discharged from the compressor 1; the high-temperature and high-pressure refrigerant gas then passes through the stop valve A 12 and the stop valve B 13, and enters the heat exchanger from the heat exchanger inlet end 203, and becomes a refrigerant liquid at normal temperature and high pressure, and is discharged from the heat exchanger outlet end 204; at the same time, the heat is discharged to the outdoor air environment through the forced convection of the outdoor heat dissipation fan 202;

[0064] The refrigerant liquid at room temperature and high pressure continues to flow forward along the refrigerant passage B 602, passes through the liquid storage tank 17, so that the refrigerant has a buffering effect; then passes through the refrigeration pressure switch that can play a role in pressure control and protection, forward through the stop valve C 14 and the stop valve D 15, flows through the dry filter 18, filters out impurities in the refrigerant liquid, and then flows forward to reach the diversion tee 7;

[0065] The refrigerant liquid at room temperature and high pressure flows downward from the flow dividing tee 7, along the refrigerant passage D 604, through the solenoid valve A 10, and reaches the electronic expansion valve A 301, where it is throttled and depressurized to become a refrigerant liquid at low temperature and low pressure. Then, the refrigerant liquid at low temperature and low pressure enters the lower evaporator 402, where it absorbs heat from the air in an area of ​​about 1 / 2 of the evaporator 4, lowering the air temperature even lower to close to 0°C, and the refrigerant liquid at low temperature and low pressure becomes a refrigerant gas at low temperature and low pressure. At the same time, the cold air is discharged into the indoor air environment through the forced convection of the indoor blower 5.

[0066] Since the area of ​​evaporator 4 is small, the temperature of the refrigerant in evaporator 4 is low, so the temperature of the air passing through 1 / 2 of evaporator 4 for dehumidification is lower, and more water in the air is condensed; for units with fast dehumidification structure, according to actual test results, about 50% is used for dehumidification according to constant temperature and humidity design data, and 40% is used for dehumidification according to computer room air conditioning. The fast dehumidification mode can achieve the best dehumidification effect;

[0067] Finally, the low-temperature and low-pressure refrigerant gas flows from the lower half of the refrigerant connecting pipe 8, through the outlet end of the evaporator 4, along the refrigerant passage A 601, enters from the compressor suction end 101, and returns to the compressor 1; in this way, the cycle continues, achieving the purpose of indoor refrigeration and rapid dehumidification;

[0068] (2) Working mode 2, i.e., the working mode of using the upper part of the evaporator 4 for rapid dehumidification: the stop valve A12, the stop valve B13, the stop valve C14 and the stop valve D15 are opened, the solenoid valve A10 and the electronic expansion valve A301 are closed, and the solenoid valve B11 and the electronic expansion valve B302 are opened;

[0069] The refrigerant liquid at room temperature and high pressure flows upward from the flow dividing tee 7, along the refrigerant passage E 605, through the solenoid valve B 11, and reaches the electronic expansion valve B 302, where it is throttled and depressurized to become a refrigerant liquid at low temperature and low pressure. Then, the refrigerant liquid at low temperature and low pressure enters the upper evaporator 401, where it absorbs heat from the air in an area of ​​about 1 / 2 of the evaporator 4, lowering the air temperature even lower to close to 0°C, and the refrigerant liquid at low temperature and low pressure becomes a refrigerant gas at low temperature and low pressure.

[0070] Finally, the low-temperature and low-pressure refrigerant gas flows downward from the upper part of the refrigerant connecting pipe 8 through the one-way valve 9 to the lower part of the refrigerant connecting pipe 8, and then passes through the outlet end of the evaporator 4, along the refrigerant passage A 601, enters from the suction end 101 of the compressor, and returns to the compressor 1;

[0071] Same working mode as 1;

[0072] (3) Working mode 3, using the upper and lower parts of the evaporator 4 for full cooling and dehumidification at the same time: stop valve A 12, stop valve B 13, stop valve C 14 and stop valve D 15 are opened, and solenoid valve A 10, electronic expansion valve A 301, solenoid valve B 11 and electronic expansion valve B 302 are opened at the same time;

[0073] The refrigerant liquid at room temperature and high pressure is divided into two parts. One part of the refrigerant liquid at room temperature and high pressure flows downward from the flow dividing tee 7, along the refrigerant passage D 604, through the solenoid valve A 10, and reaches the electronic expansion valve A 301, where it is throttled and depressurized to become a refrigerant liquid at low temperature and low pressure. Then, the refrigerant liquid at low temperature and low pressure enters the lower evaporator 402, where the evaporator 4 absorbs heat from the air over the entire area to reduce the air temperature. The refrigerant liquid at low temperature and low pressure becomes a refrigerant gas at low temperature and low pressure, and flows to the lower half of the refrigerant connecting pipe 8.

[0074] Another part of the refrigerant liquid at room temperature and high pressure flows upward from the flow dividing tee 7, along the refrigerant passage E 605, through the solenoid valve B11, and reaches the electronic expansion valve B 302, where it is throttled and depressurized to become a low-temperature and low-pressure refrigerant liquid; then, the low-temperature and low-pressure refrigerant liquid enters the upper evaporator 401, and absorbs heat from the air in the entire area of ​​the evaporator 4 to reduce the air temperature; the low-temperature and low-pressure refrigerant liquid becomes a low-temperature and low-pressure refrigerant gas; then, the low-temperature and low-pressure refrigerant gas flows downward from the upper half of the refrigerant connecting pipe 8 through the one-way valve 9 to the lower half of the refrigerant connecting pipe 8, and then mixes with the refrigerant liquid at room temperature and high pressure that has flowed from the lower evaporator 402 to the lower half of the refrigerant connecting pipe 8, and then passes through the gas outlet of the evaporator 4, along the refrigerant passage A 601, enters from the suction end 101 of the compressor, and returns to the compressor 1;

[0075] In working mode 3, the temperature is reduced to the dew point of water in the air, and condensed water is crystallized on the surface of the indoor evaporator 4 to achieve the purpose of dehumidification; at this time, the area of ​​the evaporator 4 is large, and according to the constant temperature and humidity design data, about 20-30% is used for dehumidification, and according to the computer room air conditioner, 5-10% is used for dehumidification; therefore, the dehumidification effect is very limited in the full cooling mode;

[0076] The rest is the same as working mode 1.

[0077] Since the rapid dehumidification adopts shunt control of 2 solenoid valves and 2 electronic expansion valves, when the rapid dehumidification is running, the lower part of the evaporator 4 can be used, and the upper part of the evaporator 4 can also be used; when the rapid dehumidification refrigerant is operated at an evaporation temperature below 0°C, and it runs in this mode for a long time, the water droplets on the panel of the evaporator 4 are prone to frost and ice; this structure allows the upper and lower parts of the evaporator 4 to be used alternately, which can prevent the occurrence of frost and ice on the panel of the evaporator 4, and can meet the requirements of rapid dehumidification.

[0078] The embodiments described above are only preferred implementations of the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A constant temperature and humidity air conditioning unit with a rapid dehumidification structure, comprising a compressor, a condenser structure, a throttling device, an evaporator, an indoor air blower and a refrigerant passage, wherein the indoor air blower is arranged above the evaporator; the compressor, the throttling device and the evaporator constitute an indoor unit, the condenser structure comprises an outdoor heat exchanger and an outdoor heat dissipation fan arranged outside the outdoor heat exchanger, and the outdoor heat exchanger and the outdoor heat dissipation fan constitute an outdoor unit; the compressor comprises a compressor suction end and a compressor outlet end, and the outdoor heat exchanger comprises a heat exchanger inlet end and a heat exchanger outlet end; the refrigerant passage comprises a refrigerant passage A and a refrigerant passage B, the outlet end of the evaporator is connected to the compressor suction end by the refrigerant passage A, and the outlet end of the compressor is connected to the heat exchanger inlet end by the refrigerant passage B, characterized in that: It also includes a flow dividing tee, which is arranged in front of the throttling device and the evaporator; the evaporator includes an upper evaporator and a lower evaporator, a partition is arranged between the upper evaporator and the lower evaporator, the upper evaporator and the lower evaporator are arranged in a stacked manner through the partition, and the upper evaporator and the lower evaporator are symmetrical with the partition as the center; A refrigerant connecting pipe is provided at the air outlet of the evaporator, a one-way valve is provided in the middle of the refrigerant connecting pipe, and the one-way valve divides the refrigerant connecting pipe into an upper half of the refrigerant connecting pipe and a lower half of the refrigerant connecting pipe. The upper half of the refrigerant connecting pipe is connected to the air outlet of the upper evaporator, and the lower half of the refrigerant connecting pipe is connected to the air outlet of the lower evaporator. The throttling device comprises an electronic expansion valve A and an electronic expansion valve B, wherein the electronic expansion valve A is arranged at the inlet end of the upper evaporator, and the electronic expansion valve B is arranged at the inlet end of the lower evaporator; The refrigerant passage also includes a refrigerant passage C, a refrigerant passage D and a refrigerant passage E; from the outlet of the heat exchanger to the diverter tee, connected by the refrigerant passage C, from the diverter tee to the electronic expansion valve A, connected by the refrigerant passage D, from the diverter tee to the electronic expansion valve B, connected by the refrigerant passage E, the refrigerant passage D and the refrigerant passage E are in parallel relationship; A solenoid valve A is provided on the refrigerant passage D from the diverter tee to the electronic expansion valve A, and a solenoid valve B is provided on the refrigerant passage E from the diverter tee to the electronic expansion valve B.

2. A constant temperature and humidity air conditioning unit with a rapid dehumidification structure according to claim 1, characterized in that: The outdoor heat exchanger comprises copper tubes and aluminum fins. The outdoor heat exchanger is made by mechanical expansion of copper tubes in series with aluminum fins. The inner and outer rings are expanded and then assembled together and bent into shape. The fin spacing is 1.7 mm.

3. A constant temperature and humidity air conditioning unit with a rapid dehumidification structure according to claim 1, characterized in that: A stop valve A and a stop valve B are provided on the refrigerant passage B from the air outlet of the compressor to the air inlet of the heat exchanger, wherein the stop valve A is indoors and the stop valve B is outdoors; a stop valve C and a stop valve D are provided on the refrigerant passage C from the outlet of the heat exchanger to the diversion tee, wherein the stop valve C is outdoors and the stop valve D is indoors.

4. A constant temperature and humidity air conditioning unit with a rapid dehumidification structure according to claim 1, characterized in that: The product model of the diversion tee is a 16T-type equal-diameter copper tee.

5. A constant temperature and humidity air conditioning unit with a rapid dehumidification structure according to claim 1, characterized in that: An oil separator is provided on the refrigerant passage B, between the compressor suction end at the heat exchanger outlet and the shut-off valve A, and the oil separator separates the lubricating oil in the high-temperature and high-pressure refrigerant gas discharged from the compressor.

6. A constant temperature and humidity air conditioning unit with a rapid dehumidification structure according to claim 1, characterized in that: A liquid accumulator is provided on the refrigerant passage C, between the suction end of the compressor and the stop valve C, and the liquid accumulator can play the role of refrigerant buffer.

7. A constant temperature and humidity air conditioning unit with a rapid dehumidification structure according to claim 1, characterized in that: A drying filter is arranged on the refrigerant passage C, between the stop valve D and the diversion tee, and the drying filter can filter impurities and purify the refrigerant medium.

8. The constant temperature and humidity air conditioning unit with a rapid dehumidification structure according to claim 1, characterized in that: A gas-liquid separator is arranged on the refrigerant passage A, from the gas outlet of the evaporator to the air intake of the compressor. The function of the gas-liquid separator is to process the gas containing a small amount of condensate to realize the gas phase purification of the low-temperature and low-pressure refrigerant gas flowing from the gas outlet of the evaporator to the air intake of the compressor. The product model of the gas-liquid separator is gas-liquid separator QFQ-5.

0.

9. The working method of a constant temperature and humidity air conditioning unit with a rapid dehumidification structure according to any one of claims 1 to 8, characterized in that: A working method of a constant temperature and humidity air conditioning unit with a rapid dehumidification structure includes three working modes: (1) Working mode 1, i.e., the working mode of using the lower half of the evaporator for rapid dehumidification: stop valve A, stop valve B, stop valve C and stop valve D are open, solenoid valve A and electronic expansion valve A are open, and solenoid valve B and electronic expansion valve B are closed; The compressor starts, and the compressor compresses the low-temperature and low-pressure refrigerant gas input from the compressor evaporator into high-temperature and high-pressure refrigerant gas. The high-temperature and high-pressure refrigerant gas is discharged from the compressor outlet, along the refrigerant path B, and passes through the oil separator to separate the lubricating oil in the high-temperature and high-pressure refrigerant gas discharged from the compressor; the high-temperature and high-pressure refrigerant gas then passes through the stop valve A and the stop valve B, enters the heat exchanger from the heat exchanger inlet end, becomes a normal temperature and high-pressure refrigerant liquid, and is discharged from the heat exchanger outlet end; at the same time, the heat is discharged to the outdoor air environment through the forced convection of the outdoor heat dissipation fan; The refrigerant liquid at room temperature and high pressure continues to flow forward along the refrigerant path B, passes through the liquid storage tank, and makes the refrigerant have a buffering effect; then passes through the refrigeration pressure switch that can play a role in pressure control and protection, and flows forward through the stop valve C and stop valve D, flows through the dry filter, filters out impurities in the refrigerant liquid, and then flows forward to reach the diversion tee; The normal temperature and high pressure refrigerant liquid flows downward from the flow divider tee, along the refrigerant passage D, through the solenoid valve A, and reaches the electronic expansion valve A, where it is throttled and depressurized to become a low temperature and low pressure refrigerant liquid; then, the low temperature and low pressure refrigerant liquid enters the lower evaporator, absorbs heat from the air within the 1 / 2 area of ​​the evaporator, and lowers the air temperature even lower, close to 0°C, and the low temperature and low pressure refrigerant liquid becomes a low temperature and low pressure refrigerant gas; at the same time, the cold air is discharged into the indoor air environment through the forced convection of the indoor blower; Since the evaporator area is small, the temperature of the refrigerant in the evaporator is low, so the temperature of the air passing through the 1 / 2 evaporator used for dehumidification is lower, and more water in the air is condensed; for units with a rapid dehumidification structure, according to actual test results, 50% is used for dehumidification according to the constant temperature and humidity design data, and 40% is used for dehumidification according to the computer room air conditioner. The rapid dehumidification mode can achieve the best dehumidification effect; Finally, the low-temperature and low-pressure refrigerant gas flows from the lower part of the refrigerant connecting pipe, through the outlet end of the evaporator, along the refrigerant path A, enters from the suction end of the compressor, and returns to the compressor; In this way, the cycle continues to achieve the purpose of indoor cooling and rapid dehumidification; (2) Working mode 2, i.e., the working mode of using the upper part of the evaporator for rapid dehumidification: stop valve A, stop valve B, stop valve C and stop valve D are open, solenoid valve A and electronic expansion valve A are closed, and solenoid valve B and electronic expansion valve B are open; The refrigerant liquid at room temperature and high pressure flows upward from the flow divider tee, along the refrigerant passage E, through the solenoid valve B, and reaches the electronic expansion valve B, where it is throttled and depressurized to become a refrigerant liquid at low temperature and low pressure. Then, the refrigerant liquid at low temperature and low pressure enters the upper evaporator, where it absorbs heat from the air within the 1 / 2 area of ​​the evaporator, lowering the air temperature even lower to close to 0°C, and the refrigerant liquid at low temperature and low pressure becomes a refrigerant gas at low temperature and low pressure. Finally, the low-temperature and low-pressure refrigerant gas flows from the upper part of the refrigerant connecting pipe downward through the one-way valve to the lower part of the refrigerant connecting pipe, then passes through the outlet end of the evaporator, along the refrigerant path A, enters from the suction end of the compressor, and returns to the compressor; Same working mode as 1; (3) Working mode 3, using the upper and lower parts of the evaporator for full cooling and dehumidification at the same time: stop valve A, stop valve B, stop valve C and stop valve D are opened, and solenoid valve A, electronic expansion valve A, solenoid valve B and electronic expansion valve B are opened at the same time; The normal temperature and high pressure refrigerant liquid is divided into two parts. One part of the normal temperature and high pressure refrigerant liquid flows downward from the diversion tee, along the refrigerant passage D, through the solenoid valve A, and reaches the electronic expansion valve A, where it is throttled and depressurized to become a low temperature and low pressure refrigerant liquid. Then, the low temperature and low pressure refrigerant liquid enters the lower evaporator, where the evaporator absorbs heat from the air over the entire area, lowering the air temperature. The low temperature and low pressure refrigerant liquid becomes a low temperature and low pressure refrigerant gas, and flows to the lower half of the refrigerant connecting pipe. Another part of the refrigerant liquid at room temperature and high pressure flows upward from the flow dividing tee, along the refrigerant passage E, through the solenoid valve B, and reaches the electronic expansion valve B, where it is throttled and depressurized to become a refrigerant liquid at low temperature and low pressure; then, the refrigerant liquid at low temperature and low pressure enters the upper evaporator, where it absorbs heat from the air within the entire area of ​​the evaporator to lower the air temperature; the refrigerant liquid at low temperature and low pressure becomes a refrigerant gas at low temperature and low pressure; then, the refrigerant gas at low temperature and low pressure flows downward from the upper part of the refrigerant connecting pipe through the one-way valve to the lower part of the refrigerant connecting pipe, and then mixes with the refrigerant liquid at room temperature and high pressure that has flowed from the lower evaporator to the lower part of the refrigerant connecting pipe, and then passes through the gas outlet of the evaporator, along the refrigerant passage A, enters from the suction end of the compressor, and returns to the compressor; In working mode 3, the temperature is reduced to the dew point of water in the air, and condensed water is crystallized on the surface of the indoor evaporator to achieve the purpose of dehumidification; at this time, the evaporator area is large, and according to the constant temperature and humidity design data, 20-30% is used for dehumidification, and according to the computer room air conditioner, 5-10% is used for dehumidification; therefore, the dehumidification effect is very limited in the full cooling mode; The rest is the same as working mode 1.

10. The working method of a constant temperature and humidity air conditioning unit with a rapid dehumidification structure according to claim 9, characterized in that: Rapid dehumidification uses 2 solenoid valves and 2 electronic expansion valves for shunt control. When running rapid dehumidification, 2 solenoid valves and 2 electronic expansion valves are used for shunt control. The lower half of the evaporator can also be used. The refrigerant in rapid dehumidification operates at an evaporation temperature below 0°C. If it runs in this mode for a long time, water droplets on the evaporator panel are prone to frost and ice. This structure allows the upper and lower parts of the evaporator to be used alternately, which can prevent the occurrence of frost and ice on the evaporator panel and meet the requirements of rapid dehumidification.

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