CN210980080U - Constant temperature and humidity air conditioning unit - Google Patents

Abstract

A constant temperature and humidity air conditioning unit belongs to the technical field of air conditioners and comprises a compressor, a condenser structure, a throttling device, an evaporator, an indoor air feeder, a refrigerant passage and a flow dividing tee joint; 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; the air outlet end of the evaporator is provided with a refrigerant communicating pipe, and the middle of the refrigerant communicating pipe is provided with a one-way valve; the throttling device comprises an electronic expansion valve A and an electronic expansion valve B; an electromagnetic valve A is arranged on a refrigerant passage D from the shunt tee joint to the electronic expansion valve A, and an electromagnetic valve B is arranged on a refrigerant passage E from the shunt tee joint to the electronic expansion valve B. The utility model has the advantages that: simple structure, dehumidification are effectual, can not produce to freeze and frost, the effectual evaporating temperature that prevents is low excessively and causes the phenomenon of freezing and frosting, can satisfy the requirement of quick dehumidification simultaneously again.

Description

A constant temperature and humidity air conditioning unit

technical field

The utility model relates to an air conditioner unit, in particular to a constant temperature and humidity air conditioner unit, which belongs to the technical field of air conditioners.

Background technique

The principle of air conditioning unit dehumidification is to use the principle that the moisture in the air will be condensed into water when it is cold. When the refrigerant in the evaporator of the air conditioner evaporates, it absorbs a lot of heat, which reduces the surface temperature of the evaporator a lot, which causes the water vapor in the indoor air to liquefy into water when it is cooled, and the condensed water will flow through the outlet. The water pipe is discharged to the outside, so that part of the moisture in the room air is removed in this way.

At present, the dehumidification method of constant temperature and humidity machine adopts full cooling and dehumidification. During the dehumidification process, the evaporation temperature of the evaporator is high and the dehumidification capacity is small, and a large amount of cooling capacity is used to cool the air. When the temperature has been stabilized, the total cold dehumidification is bound to require a large amount of reheating and electric heating to stabilize the temperature. Rapid dehumidification cannot be provided during this operation. Moreover, the use of reheating electric heating consumes a lot of energy. In conventional refrigeration operation, the latent cooling capacity of the constant temperature and humidity air conditioning unit for dehumidification is very low, 20-30%, and the computer room air conditioner is 5-9%.

The application publication number is CN 103968619 A, the application number is 2013100410196, the utility model name is the patent application of "air conditioner with rapid dehumidification", and a heat exchanger is added. On the second refrigerant passage, the second cooling can be carried out to achieve the purpose of rapid dehumidification. The above-mentioned patent application for "Air Conditioner with Rapid Dehumidification", due to the addition of a heat exchanger, complicates the overall structure, increases the volume of the product and increases the cost, which is not conducive to market competition.

Utility model content

The purpose of the present utility model is to provide a constant temperature and humidity air conditioner unit, which can achieve the simple structure, good dehumidification effect, and no It will produce icing and frosting, effectively prevent the phenomenon of icing and frosting caused by too low evaporation temperature, and at the same time, it can meet the purpose of rapid dehumidification.

In order to achieve the above purpose, the technical solution adopted by the present invention is: a constant temperature and humidity air conditioning unit, comprising a compressor, a chiller structure, a throttling device, an evaporator, an indoor blower and a refrigerant passage, and the indoor blower is arranged in the evaporation The compressor, the throttling device and the evaporator form an indoor unit, and the cooler structure includes an outdoor heat exchanger and an outdoor cooling fan arranged outside the outdoor heat exchanger. The outdoor heat exchanger and the outdoor cooling fan The fan constitutes an outdoor unit; the compressor includes a compressor suction end and a compressor outlet end, the outdoor heat exchanger includes a heat exchanger intake end and a heat exchanger outlet end; the refrigerant passage includes refrigerant passage A and The refrigerant passage B, from the outlet end of the evaporator to the suction end of the compressor, is connected by the refrigerant passage A, and from the outlet end of the compressor to the air inlet end of the heat exchanger, and is connected by the refrigerant passage B;

It also includes a split tee, which is arranged in front of the throttling device and the evaporator; the evaporator includes an upper evaporator and a lower evaporator, and a partition is provided between the upper evaporator and the lower evaporator. Plate, the upper evaporator and the lower evaporator pass through the baffle, and the upper and lower parts are superimposed, and the upper evaporator and the lower evaporator are centered on the baffle, and the upper and lower parts are symmetrical;

The outlet end of the evaporator is provided with a refrigerant communication pipe, and a check valve is arranged in the middle of the refrigerant communication pipe. The one-way valve divides the refrigerant communication pipe into the upper half of the refrigerant communication pipe and the lower half of the refrigerant communication pipe. The upper half of the communication pipe is communicated with the outlet end of the upper evaporator, and the lower half of the refrigerant communication pipe is communicated with the outlet end of the lower evaporator;

The throttling device includes an electronic expansion valve A and an electronic expansion valve B, 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 end of the heat exchanger to the shunt tee, connected with the refrigerant passage C, and from the shunt tee to the electronic expansion valve A, connected with the refrigerant passage D , from the shunt three-way to the electronic expansion valve B, connected with the refrigerant passage E, and the refrigerant passage D and the refrigerant passage E are in a parallel relationship;

A solenoid valve A is provided on the refrigerant passage D from the split three-way to the electronic expansion valve A, and a solenoid valve B is provided on the refrigerant passage E from the split three-way to the electronic expansion valve B.

The outdoor heat exchanger includes copper tubes and aluminum fins. The outdoor heat exchanger is fabricated by mechanically expanding copper tubes in series with aluminum fins. The inner and outer rings are respectively expanded and then assembled and bent together. After the heater is made, the air tightness test is carried out, the pressure is 4.3Mpa, and the fin spacing is 1.7mm.

A stop valve A and a stop valve B are provided on the refrigerant passage B between the compressor outlet end and the heat exchanger inlet end, the stop valve A is indoors, and the stop valve B is outdoors; A stop valve C and a stop valve D are arranged on the refrigerant passage C to the split three-way. 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 FJ16JK- 3-NBHK-00, the product models of the globe valve C and globe valve D are both FJ13JK-3-NBHK-00.

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 diverter tee is a 16T diameter copper tee with equal diameter, the electronic expansion valve The product models of 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.

An oil separator is arranged on the refrigerant passage B, between the suction end of the compressor at the outlet end of the heat exchanger 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, In order to ensure the safe and efficient operation of the device; the product model of the oil separator is Emerson Oil Separator AW55877.

On the refrigerant passage C, between the suction end of the compressor and the shut-off valve C, there is a liquid accumulator. The liquid accumulator can play the role of buffering the refrigerant and protect the compressor. The product model of the liquid accumulator is: Reservoir CYQ-4.2.

A drying filter is arranged on the refrigerant passage C, between the cut-off valve D and the shunt three-way. The drying filter can filter impurities and purify the cooling medium. The product model of the drying filter is filter drying EK- 165S.

A gas-liquid separator is arranged on the refrigerant passage A from the gas outlet end of the evaporator to the suction end of the compressor. The function of the gas-liquid separator is to process the gas containing a small amount of condensate and realize the gas outlet from the evaporator. The gas-liquid separator is used for gas-phase purification of low-temperature and low-pressure refrigerant gas at the suction side of the compressor. The product model of the gas-liquid separator is the gas-liquid separator QFQ-5.0.

A working method of a constant temperature and humidity air conditioning unit includes 3 working modes:

(1) Working mode 1, that is, the working mode in which the lower part of the evaporator is used for rapid dehumidification: the shut-off valve A, shut-off valve B, shut-off valve C and shut-off valve D are opened, the solenoid valve A and the electronic expansion valve A are opened, and the solenoid valve Valve B and electronic expansion valve B are closed;

The compressor starts, the compressor compresses the low-temperature and low-pressure refrigerant gas input from the compressor evaporator into high-temperature and high-pressure refrigerant gas, and the high-temperature and high-pressure refrigerant gas is discharged from the compressor outlet, along the refrigerant passage B, through the oil separation It separates the lubricating oil in the high-temperature and high-pressure refrigerant gas discharged from the compressor; the high-temperature and high-pressure refrigerant gas passes through the stop valve A and the stop valve B, and enters the heat exchanger from the intake end of the heat exchanger, and becomes normal temperature. The high-pressure refrigerant liquid is discharged from the outlet end of the heat exchanger; at the same time, the heat is discharged into the outdoor air environment through the forced convection of the outdoor cooling fan;

The refrigerant liquid at normal temperature and high pressure continues to flow forward along the refrigerant passage B, and passes through the accumulator, so that the refrigerant has a buffering effect; then passes through the refrigeration pressure switch that can play a pressure control and protection role, and passes through the stop valve C and the cut-off valve. Valve D, flows through the dry filter, filters out the impurities in the refrigerant liquid, and then flows forward to reach the shunt tee;

The normal temperature and high pressure refrigerant liquid flows downward from the shunt tee, along the refrigerant passage D, passes through the solenoid valve A, and reaches the electronic expansion valve A, where it is throttled and depressurized, and becomes a low temperature and low pressure refrigerant liquid; then, the low temperature and low pressure refrigeration The refrigerant liquid enters the lower evaporator, absorbs the heat in the air in about 1/2 of the area of the evaporator, lowers the air temperature to a lower temperature, close to 0 °C, and the low-temperature and low-pressure refrigerant liquid becomes low-temperature and low-pressure refrigeration. At the same time, through the forced convection of the indoor blower, the cold air is discharged into the indoor air environment;

Due to the small area of the evaporator, the temperature of the refrigerant in the evaporator is small, so that the air temperature of 1/2 of the evaporator used for dehumidification is lower, and more water is condensed in the air; the unit using the rapid dehumidification structure, The actual test effect, according to the constant temperature and humidity design data, about 50% is used for dehumidification, and 40% is used for dehumidification according to the computer room air conditioner, and the fast dehumidification mode can achieve the best dehumidification effect;

Finally, the low-temperature and low-pressure refrigerant gas enters from the lower half of the refrigerant communication pipe, passes 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; The purpose of indoor cooling and rapid dehumidification;

(2) Working mode 2, that is, the working mode in which the upper part of the evaporator is used for rapid dehumidification: the shut-off valve A, shut-off valve B, shut-off valve C and shut-off valve D are opened, the solenoid valve A and the electronic expansion valve A are closed, and the solenoid valve Valve B and electronic expansion valve B open;

The normal temperature and high pressure refrigerant liquid flows upwards from the shunting tee, along the refrigerant passage E, passes through the solenoid valve B, and reaches the electronic expansion valve B, where it is throttled and depressurized, and becomes a low temperature and low pressure refrigerant liquid; then, the low temperature and low pressure refrigerant The liquid enters the upper evaporator, absorbs the heat in the air in about 1/2 of the area of the evaporator, and reduces the air temperature to a lower temperature, close to 0 °C, and the low-temperature and low-pressure refrigerant liquid becomes a low-temperature and low-pressure refrigerant. gas;

Finally, the low-temperature and low-pressure refrigerant gas passes from the upper half of the refrigerant communication pipe down through the one-way valve, to the lower half of the refrigerant communication pipe, and then passes through the outlet end of the evaporator, along the refrigerant passage A, and sucks from the compressor end enters and returns to the compressor;

Yutong working mode 1;

(3) Working mode 3, the working mode of using the upper and lower half of the evaporator for full cooling refrigeration and dehumidification at the same time: stop valve A, stop valve B, stop valve C and stop valve D are open, 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. A part of the normal temperature and high pressure refrigerant liquid flows downward from the shunt tee, along the refrigerant passage D, passes through the solenoid valve A, reaches the electronic expansion valve A, and is throttled and depressurized to become a low temperature. The low-pressure refrigerant liquid; immediately, the low-temperature and low-pressure refrigerant liquid enters the lower evaporator, and the entire area of the evaporator absorbs the heat in the air, reducing the air temperature; the low-temperature and low-pressure refrigerant liquid becomes a low-temperature and low-pressure refrigerant. The gas flows to the lower half of the refrigerant communication pipe;

Another part of the normal temperature and high pressure refrigerant liquid is self-splitting three-way upwards, along the refrigerant passage E, through the solenoid valve B, to the electronic expansion valve B, throttling and depressurizing, and becomes a low temperature and low pressure refrigerant liquid; Immediately, the low temperature and low pressure refrigerant liquid The refrigerant liquid enters the upper evaporator, and the entire area of the evaporator absorbs the heat in the air, reducing 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 automatically The upper half of the refrigerant communication pipe goes down through the check valve to the lower half of the refrigerant communication pipe, and is mixed with the normal temperature and high pressure refrigerant liquid that has flowed from the lower evaporator to the lower half of the refrigerant communication pipe. 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 working mode 3, the temperature is lowered to the dew point of water in the air, and the condensed water crystallizes on the surface of the indoor evaporator to achieve the purpose of dehumidification; at this time, the area of the evaporator is large, and about 20-30% of the design data of constant temperature and humidity is used for dehumidification. For dehumidification, 5-10% of the machine room air conditioner is used for dehumidification; so the dehumidification effect is very limited in full cooling mode;

The same as working mode 1.

Rapid dehumidification is controlled by 2 solenoid valves and 2 electronic expansion valves. When running fast dehumidification, 2 solenoid valves and 2 electronic expansion valves are used for shunt control. The lower part of the evaporator can also be used. The upper part of the upper part; when the rapid dehumidification refrigerant is running at an evaporation temperature lower than 0 °C, if it runs in this mode for a long time, the water droplets on the evaporator panel are easy to frost and freeze; this structure can connect the upper and lower parts of the evaporator. Parts are used alternately, which can prevent the occurrence of frost and icing of water droplets on the evaporator panel, and can also meet the requirements of rapid dehumidification.

Compared with the prior art, the beneficial effects of the present utility model are:

﹙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 add a shunt tee. A solenoid valve and an electronic expansion valve are installed in front of the evaporator and the lower part, and the dual control of the solenoid valve and the electronic expansion is used to change the heat exchange area and reduce the evaporation temperature to achieve the purpose of rapid dehumidification;

(2) The dehumidification effect is good, and the utility model adopts a rapid dehumidification structure, and 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 machine room air conditioner is increased from the original 50%. -9%, increased to more than 40%;

﹙3﹚There will be no icing and frosting. Change the heat exchange area structure. According to the dehumidification situation, the upper and lower evaporators can be used as backup for each other and operate alternately, which can effectively prevent the evaporating temperature from being too low and cause icing and frosting. phenomenon, and at the same time can meet the requirements of rapid dehumidification.

Description of drawings

Fig. 1 is: the utility model structural representation;

Fig. 2 is: the enlarged view of A part of Fig. 1;

Figure 3 is an enlarged view of the front view of the structure of the outdoor heat exchanger;

Figure 4 is: in working mode 1, the combined structure and working principle of the split three-way, throttling device and evaporator;

Figure 5 is: in working mode 2, the combined structure and working principle of the split three-way, throttling device and evaporator;

Figure 6 is: in the working mode 3, the combined structure and working principle diagram of the shunt tee, the throttling device and the evaporator.

Description of reference numerals: compressor 1, compressor suction end 101, compressor outlet end 102, cooler structure 2, outdoor heat exchanger 201, copper pipe 20101, aluminum fin 20102, outdoor cooling fan 202, heat exchange Air intake end 203 of heat exchanger, outlet end 204 of heat exchanger, throttling device 3, electronic expansion valve A 301, electronic expansion valve B 302, evaporator 4, upper evaporator 401, lower evaporator 402, baffle 403, indoor blower 5. Refrigerant passage 6, refrigerant passage A 601, refrigerant passage B 602, refrigerant passage C603, refrigerant passage D 604, refrigerant passage E 605, shunt three-way 7, refrigerant communication pipe 8, one-way valve 9, solenoid valve A10, solenoid Valve B11, shut-off valve A12, shut-off valve B13, shut-off valve C14, shut-off valve D15, oil separator 16, accumulator 17, filter drier 18, gas-liquid separator 19.

Detailed ways

The present utility model will be further described below with reference to the accompanying drawings and specific embodiments, but it is not intended to limit the present utility model.

As shown in Figures 1 to 6, a constant temperature and humidity air conditioning unit includes a compressor 1, a chiller structure 2, a throttling device 3, an evaporator 4, an indoor blower 5 and a refrigerant passage 6. The indoor blower 5 It is arranged above the evaporator 4; the compressor 1, the throttling device 3 and the evaporator 4 form an indoor unit, and the cooler structure 2 includes an outdoor heat exchanger 201 and an outdoor heat exchanger 201 arranged outside the outdoor heat exchanger The cooling fan 202, the outdoor heat exchanger 201 and the outdoor cooling fan 202 form an outdoor unit; the compressor 1 includes a compressor suction end 101 and a compressor air outlet 102, and the outdoor heat exchanger 201 includes a heat exchanger intake air end 203 and the outlet end 204 of the heat exchanger; 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, connected with the refrigerant passage A 601, from the compressor The air outlet end 102 of the machine is connected to the air inlet end 203 of the heat exchanger by the refrigerant passage B 602;

It also includes a split three-way 7, which is arranged in the front position of the throttling device 3 and the evaporator 4; the evaporator 4 includes an upper evaporator 401 and a lower evaporator 402, and the upper evaporator 401 and A partition 403 is arranged between the lower evaporators 402, and the upper and lower evaporators 401 and 402 pass through the partition 403 and are superimposed on top and bottom. The upper and lower evaporators 401 and 402 are centered on the Lower symmetry;

The outlet end of the evaporator 4 is provided with a refrigerant communication pipe 8, and a check valve 9 is arranged in the middle of the refrigerant communication pipe 8. The one-way valve 9 divides the refrigerant communication pipe 8 into the upper half of the refrigerant communication pipe 8 and communicates with the refrigerant. In the lower half of the pipe 8, the upper half of the refrigerant communication pipe 8 is communicated with the outlet end of the upper evaporator 401, and the lower half of the refrigerant communication pipe 8 is communicated with the outlet end of the lower evaporator 402;

The throttling device 3 includes an electronic expansion valve A 301 and an electronic expansion valve B 302, 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 ;

The refrigerant passage 6 also includes a refrigerant passage C 603, a refrigerant passage D 604 and a refrigerant passage E 605; from the outlet end 204 of the heat exchanger to the shunt tee 7, connected with the refrigerant passage C 603, from the shunt tee 7 to the electronic expansion The valve A 301 is connected with the refrigerant passage D 604, from the shunt 3-way 7 to the electronic expansion valve B 302, and is connected with the refrigerant passage E 605, and the refrigerant passage D604 and the refrigerant passage E 605 are in a parallel relationship;

A solenoid valve A10 is provided on the refrigerant passage D 604 from the split three-way 7 to the electronic expansion valve A 301, and a solenoid valve B11 is provided on the refrigerant passage E 605 from the split three-way 7 to the electronic expansion valve B 302.

The outdoor heat exchanger 201 includes copper tubes 20101 and aluminum fins 20102. The production of the outdoor heat exchanger 201 is made by mechanical expansion of copper tubes 20101 and sets of aluminum fins 20102. The inner and outer rings are respectively expanded and then assembled together. Bending and forming; the air tightness test of the outdoor heat exchanger 201 is carried out after the production is completed, the pressure is 4.3Mpa, and the fin spacing is 1.7mm.

A stop valve A12 and a stop valve B13 are provided on the refrigerant passage B 602 from the compressor air outlet 102 to the heat exchanger air intake end 203, the stop valve A12 is indoors, and the stop valve B13 is outdoors; On the refrigerant passage C603 from the outlet end 204 of the shunting device 7 to the shunt 7, a stop valve C14 and a stop valve D15 are provided. The stop valve C14 is outdoors and the stop valve D15 is indoors; the stop valve A12 and the stop valve B13 The product models are both FJ16JK-3-NBHK-00, and the product models of the globe valve C14 and globe valve D15 are both FJ13JK-3-NBHK-00.

The product model of the compressor 1 is ZR144KC-TFP, the product model of the outdoor cooling fan 202 is DS760C-190B4.EC, and 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 B 302 are both DPF (S03) 4.0C-01, and the product models of the solenoid valve A10 and the solenoid valve B11 are both 200RB7T7.

An oil separator 16 is provided on the refrigerant passage B 602, between the outlet end 204 of the heat exchanger and the suction end 101 of the compressor and the shut-off valve A12. The oil separator 16 separates the high temperature and high pressure refrigerant gas discharged from the compressor 1 into the refrigerant gas. The lubricating oil is separated to ensure the safe and efficient operation of the device; the product model of the oil separator 16 is Emerson oil separator AW55877.

On the refrigerant passage C603, between the compressor suction end 101 and the shut-off valve C14, there is a liquid accumulator 17, which can play the role of refrigerant buffer, protect the compressor 1, and store liquid The product model of the device 17 is CYQ-4.2.

On the refrigerant passage C603, between the cut-off valve D15 and the shunt tee 7, there is a drying filter 18, which can filter impurities and purify the cooling medium. The product model of the drying filter 18 is: EK-165S.

A gas-liquid separator 19 is arranged on the refrigerant passage A 601 from the outlet end of the evaporator 4 to the suction end 101 of the compressor. The gas-phase purification of the low-temperature and low-pressure refrigerant gas flowing from the outlet end of the evaporator 4 to the suction end 101 of the compressor. The product model of the gas-liquid separator 19 is QFQ-5.0.

A working method of a constant temperature and humidity air conditioning unit includes 3 working modes:

(1) Working mode 1, that is, the working mode in which the lower half of the evaporator 4 is used for rapid dehumidification: the shut-off valve A12, the shut-off valve B13, the shut-off valve C14 and the shut-off valve D15 are opened, and the solenoid valve A10 and the electronic expansion valve A 301 are opened , the solenoid valve B11 and the electronic expansion valve B 302 are closed;

The compressor 1 starts, 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, and the high-temperature and high-pressure refrigerant gas is discharged from the compressor outlet 102 along the refrigerant passage. B602. The lubricating oil in the high-temperature and high-pressure refrigerant gas discharged from the compressor 1 is separated through the oil separator 16; Entering the heat exchanger, it becomes a normal temperature and high pressure refrigerant liquid, and is discharged from the outlet end 204 of the heat exchanger; at the same time, the heat is discharged into the outdoor air environment through the forced convection of the outdoor cooling fan 202;

The refrigerant liquid at normal temperature and high pressure continues to flow forward along the refrigerant passage B 602, and passes through the accumulator 17, so that the refrigerant has a buffering effect; then passes through the refrigeration pressure switch that can play a pressure control and protection role, and passes through the stop valve C14. and the cut-off valve D15, flow through the drying filter 18, filter out the impurities in the refrigerant liquid, and then flow forward to reach the diverter tee 7;

The normal temperature and high pressure refrigerant liquid flows downward from the shunt tee 7, along the refrigerant passage D 604, passes through the solenoid valve A10, reaches the electronic expansion valve A 301, is throttled and depressurized, and becomes a low temperature and low pressure refrigerant liquid; The low-pressure refrigerant liquid enters the lower evaporator 402, absorbs the heat in the air in about 1/2 of the area of the evaporator 4, lowers the air temperature to a lower temperature, close to 0°C, and the low-temperature and low-pressure refrigerant liquid becomes variable. into a low temperature and low pressure refrigerant gas; at the same time, through the forced convection of the indoor blower 5, the cold air is discharged into the indoor air environment;

Due to the small area of the evaporator 4, the temperature of the refrigerant in the evaporator 4 is small, so that the air temperature of the evaporator 4 used for 1/2 dehumidification is lower, and more water in the air is condensed; the rapid dehumidification structure is adopted According to the actual test results, about 50% of the design data of constant temperature and humidity is used for dehumidification, and 40% of the machine room air conditioner is used for dehumidification. The fast dehumidification mode can achieve the best dehumidification effect;

Finally, the low-temperature and low-pressure refrigerant gas enters from the lower half of the refrigerant communication 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; thus, Continuous circulation to achieve the purpose of indoor refrigeration and rapid dehumidification;

(2) Working mode 2, that is, the working mode in which the upper part of the evaporator 4 is used for rapid dehumidification: the shut-off valve A12, shut-off valve B13, shut-off valve C14 and shut-off valve D15 are opened, and the solenoid valve A10 and the electronic expansion valve A 301 are closed. , the solenoid valve B11 and the electronic expansion valve B 302 are opened;

The normal temperature and high pressure refrigerant liquid flows upwards from the shunt tee 7, along the refrigerant passage E 605, passes through the solenoid valve B11, reaches the electronic expansion valve B 302, is throttled and depressurized, and becomes a low temperature and low pressure refrigerant liquid; The refrigerant liquid enters the upper evaporator 401, absorbs the heat in the air in about 1/2 of the area of the evaporator 4, lowers the air temperature to a lower temperature, close to 0°C, and the low-temperature and low-pressure refrigerant liquid becomes Low temperature and low pressure refrigerant gas;

Finally, the low-temperature and low-pressure refrigerant gas passes from the upper half of the refrigerant communication pipe 8 down through the check valve 9, to the lower half of the refrigerant communication pipe 8, and then passes through the outlet end of the evaporator 4, along the refrigerant passage A 601, Entering from the compressor suction end 101 and returning to the compressor 1;

Yutong working mode 1;

(3) Working mode 3, the working mode of using the upper and lower half of the evaporator 4 for full cooling refrigeration and dehumidification at the same time: the cut-off valve A12, the cut-off valve B13, the cut-off valve C14 and the cut-off valve D15 are opened, and the solenoid valve A10, Electronic expansion valve A301, solenoid valve B11 and electronic expansion valve B 302 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 shunt 3-way 7, along the refrigerant passage D 604, passes through the solenoid valve A10, and reaches the electronic expansion valve A 301 to be throttled and depressurized. It becomes a low-temperature and low-pressure refrigerant liquid; then, the low-temperature and low-pressure refrigerant liquid enters the lower evaporator 402, and the evaporator 4 absorbs the heat in the air in the entire area, reducing the air temperature; the low-temperature and low-pressure refrigerant liquid becomes The low-temperature and low-pressure refrigerant gas flows to the lower half of the refrigerant communication pipe 8;

Another part of the normal temperature and high pressure refrigerant liquid flows upwards from the shunt tee 7, along the refrigerant passage E 605, passes through the solenoid valve B11, reaches the electronic expansion valve B 302, is throttled and depressurized, and becomes a low temperature and low pressure refrigerant liquid; immediately, The low-temperature and low-pressure refrigerant liquid enters the upper evaporator 401, and the entire area of the evaporator 4 absorbs the heat in the air to reduce the air temperature; the low-temperature and low-pressure refrigerant liquid becomes a low-temperature and low-pressure refrigerant gas; The refrigerant gas flows from the upper half of the refrigerant communication pipe 8 down through the one-way valve 9 to the lower half of the refrigerant communication pipe 8, and then with the refrigerant gas that has flowed from the lower evaporator 402 to the lower half of the refrigerant communication pipe 8. The refrigerant liquid at room temperature and high pressure is mixed, 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;

In working mode 3, the temperature is lowered to the dew point of water in the air, and the condensed water crystallizes 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 it is about 20-30% according to the design data of constant temperature and humidity It is used for dehumidification, and it is used for dehumidification according to 5-10% of the computer room air conditioner; so the dehumidification effect is very limited in the full cooling mode;

The same as working mode 1.

Rapid dehumidification is controlled by 2 solenoid valves and 2 electronic expansion valves. When running fast dehumidification, 2 solenoid valves and 2 electronic expansion valves are used for shunt control. The lower part of evaporator 4 can also be used for evaporation. The upper part of the evaporator 4; when the rapid dehumidification refrigerant is running at a temperature lower than 0 °C, if it runs in this mode for a long time, the water droplets on the panel of the evaporator 4 are easy to frost and freeze; this structure can make the evaporator 4 The upper and lower parts of the evaporator are used alternately, which can prevent the occurrence of frost and icing of water droplets on the 4-panel of the evaporator, and can also meet the requirements of rapid dehumidification.

The above-mentioned embodiments are only preferred embodiments of the present invention, and the usual changes and substitutions made by those skilled in the art within the scope of the technical solutions of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A constant temperature and humidity air conditioning unit comprises a compressor, a condenser structure, a throttling device, an evaporator, an indoor air feeder and a refrigerant passage, wherein the indoor air feeder is arranged above the evaporator; the compressor, the throttling device and the evaporator form an indoor unit, the refrigerating device structure comprises an outdoor heat exchanger and an outdoor heat dissipation fan arranged on the outer side of the outdoor heat exchanger, and the outdoor heat exchanger and the outdoor heat dissipation fan form an outdoor unit; the outdoor heat exchanger comprises a heat exchanger inlet end and a heat exchanger outlet end; the refrigerant passageway includes refrigerant passageway A and refrigerant passageway B, from the end of giving vent to anger of evaporimeter to the compressor suction end, with refrigerant passageway A connection, give vent to anger from the compressor end to the heat exchanger inlet end, with refrigerant passageway B connection, its characterized in that:

the evaporator also comprises a flow-dividing tee joint, and the flow-dividing tee joint is arranged in front of the throttling device and the evaporator; the evaporator comprises an upper evaporator and a lower evaporator, a partition plate is arranged between the upper evaporator and the lower evaporator, the upper evaporator and the lower evaporator are arranged in an up-down overlapping mode through the partition plate, and the upper evaporator and the lower evaporator are symmetrical up and down by taking the partition plate as a center;

the air outlet end of the evaporator is provided with a refrigerant communicating pipe, the middle of the refrigerant communicating pipe is provided with a one-way valve, the refrigerant communicating pipe is divided into an upper half part of the refrigerant communicating pipe and a lower half part of the refrigerant communicating pipe by the one-way valve, the upper half part of the refrigerant communicating pipe is communicated with the air outlet end of the upper evaporator, and the lower half part of the refrigerant communicating pipe is communicated with the air outlet end 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 comprises a refrigerant passage C, a refrigerant passage D and a refrigerant passage E; connecting the heat exchanger outlet end to a flow-dividing tee joint by a refrigerant passage C, connecting the flow-dividing tee joint to an electronic expansion valve A by a refrigerant passage D, and connecting the flow-dividing tee joint to an electronic expansion valve B by a refrigerant passage E, wherein the refrigerant passage D and the refrigerant passage E are connected in parallel;

an electromagnetic valve A is arranged on a refrigerant passage D from the shunt tee joint to the electronic expansion valve A, and an electromagnetic valve B is arranged on a refrigerant passage E from the shunt tee joint to the electronic expansion valve B.

2. The constant temperature and humidity air conditioning unit according to claim 1, characterized in that: the outdoor heat exchanger comprises copper pipes and aluminum fins, the outdoor heat exchanger is manufactured by mechanically expanding and binding the copper pipes and the aluminum fins in a sleeved mode, and the inner ring and the outer ring are respectively expanded and then are spliced together to be bent and molded; the fin pitch was 1.7 mm.

3. The constant temperature and humidity air conditioning unit according to claim 1, characterized in that: a stop valve A and a stop valve B are arranged on a refrigerant passage B from the air outlet end of the compressor to the air inlet end of the heat exchanger, the stop valve A is arranged indoors, and the stop valve B is arranged outdoors; and a stop valve C and a stop valve D are arranged on a refrigerant passage C from the outlet end of the heat exchanger to the shunt tee, the stop valve C is arranged outdoors, and the stop valve D is arranged indoors.

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

5. The constant temperature and humidity air conditioning unit according to claim 1, characterized in that: and an oil separator is arranged on the refrigerant passage B and between the suction end of the compressor at the outlet end of the heat exchanger and the stop valve A, and the oil separator separates lubricating oil in high-temperature and high-pressure refrigerant gas discharged by the compressor.

6. The constant temperature and humidity air conditioning unit according to claim 1, characterized in that: and a liquid storage device is arranged on the refrigerant passage C and between the suction end of the compressor and the stop valve C, and the liquid storage device can play a role in buffering the refrigerant.

7. The constant temperature and humidity air conditioning unit according to claim 1, characterized in that: and a drying filter is arranged on the refrigerant passage C and between the stop valve D and the shunt tee joint, and the drying filter can filter impurities and play a role in purifying the refrigerant medium.

8. The constant temperature and humidity air conditioning unit according to claim 1, characterized in that: and a gas-liquid separator is arranged on the refrigerant passage A and between the air outlet end of the evaporator and the air suction end of the compressor, the gas-liquid separator is used for treating gas containing a small amount of condensate to realize gas-phase purification of low-temperature and low-pressure refrigerant gas flowing from the air outlet end of the evaporator to the air suction end of the compressor, and the product model of the gas-liquid separator is QFQ-5.0.

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