CN101666526A - Temperature adjusting and dehumidifying air-conditioning unit with double evaporators - Google Patents

Abstract

The invention discloses a temperature-regulating and dehumidifying air-conditioning unit with double evaporators. The unit passes through two evaporators, two condensers, a compressor, a liquid storage device, a gas-liquid separator, an expansion valve, a solenoid valve and a refrigerant pipeline. Constitutes a double evaporator temperature regulation and dehumidification system, and adjusts the air flow through the two evaporators to control the humidity of the unit's outlet air according to the humidity content of the indoor air in the regulated area or the unit inlet air The air temperature adjusts the flow of refrigerant flowing through the two condensers to control the outlet air temperature of the unit, realizing continuous and independent control of the unit outlet air temperature and humidity parameters; the two evaporators have different evaporation temperatures. The invention has wide application range, good adjustment performance, can adapt to the application occasions of temperature adjustment and dehumidification in a wide range of heat and humidity load changes, and is especially suitable for underground engineering and air conditioning application occasions with high dehumidification requirements.

Description

A double evaporator thermostat dehumidification air conditioning unit

technical field

The invention relates to a refrigeration dehumidification device, in particular to a double evaporator temperature-regulating dehumidification air-conditioning device, which belongs to the technical field of refrigeration, air-conditioning and dehumidification, and is especially suitable for underground engineering and air-conditioning applications with high requirements for dehumidification.

Background technique

Refrigerated thermostat dehumidification air conditioning unit is an air treatment equipment that uses its evaporator to cool and dehumidify the air, and recovers part of the condensation heat of the unit to heat the air after freezing and dehumidification. It is an efficient and energy-saving dehumidification method. It has been widely used It is used in dehumidification and temperature control of underground engineering and dehumidification and drying of grain, wood and food.

At present, the common refrigerated dehumidifiers mainly have three types: cooling type, heating type and temperature regulating type. The cooling type dehumidifier is composed of an indoor evaporator and an outdoor condenser. The air passes through the indoor evaporator for freezing, dehumidification and cooling. This type of dehumidifier can only be used in applications where the cooling load and humidity load are large and the heat and humidity are relatively stable. Occasionally, when the heat-humidity ratio of the adjusted area changes, it is difficult to adapt to the dual effective control of humidity and temperature. The heating type dehumidifier is composed of an indoor evaporator and an indoor condenser. After the air passes through the indoor evaporator for cooling and dehumidification, it is then heated by the indoor condenser to increase the air temperature. Dehumidification and heating functions, but can not achieve the purpose of temperature adjustment, only suitable for applications with residual humidity load and heat load requirements. The temperature-adjusting dehumidifier is based on the temperature-rising dehumidifier, adding a condenser outdoors in parallel or in series with the indoor condenser. When the unit is running, the indoor evaporator is used to cool and dehumidify the air, and the unit is recovered through the indoor condenser. Part of the heat of condensation is used to adjust the temperature of the air treated by the evaporator, and the excess heat of condensation is dissipated to the environment through the outdoor condenser. Wu Jin and others analyzed the temperature regulation mode and effect of temperature regulation of the dual condensers of the temperature regulation dehumidifier under different connection modes (Wu Jin, Zhang Jianzhen. Analysis of the connection mode of the temperature regulation dehumidifier dual condensers, Refrigeration and Air Conditioning, 2007, 7(4):84-7.). Zhu Zhiping announced a "non-blind zone temperature-regulating dehumidifier" with parallel condensers (Chinese invention patent, patent application number: 200610088389.5). It is connected in parallel with the outdoor water-cooled condenser, and the air cooled and dehumidified by the evaporator is sent to the regulated area after being regulated by the indoor air-cooled condenser, which can realize continuous adjustment of the outlet air temperature within the range of 16.6°C to 38.5°C, although this scheme It can eliminate the blind zone of temperature adjustment of the dehumidifier to a certain extent, but the premise of relying on the condensation heat of the unit to adjust the temperature of the outlet air is that the compressor must work continuously, and the dehumidifier adopts two-position control for humidity. Therefore, whether the compressor runs or not depends on whether the indoor humidity reaches the design value. When the humidity reaches the set value, the compressor stops. At this time, the dehumidifier loses the function of regulating the temperature of the air supply, which will inevitably cause relatively high indoor temperature and humidity. Large fluctuations, that is, it is difficult to effectively adjust and control the indoor temperature and humidity, especially in the occasions where the heat-humidity ratio and humidity load change greatly. Wu Maojie et al. conducted research on a double condenser temperature-regulating dehumidifier with an indoor condenser connected in series with an outdoor condenser (Wu Maojie, Liu Fengtian, Tian Wei. Research on the temperature-regulating blind area of a temperature-regulating dehumidifier. Building Thermal Ventilation and Air Conditioning, 2001, 4, 12-14.), pointing out that in the case of double condensers connected in series, there is a temperature regulation blind zone in the outlet air temperature of the dehumidifier, that is, when the air supply parameters required by the adjusted area are in the temperature regulation blind zone parameters, this type of dehumidifier cannot meet the temperature and humidity requirements. control requirements.

To sum up, the current temperature-adjusting dehumidifier can only be applied to specific applications, with poor adjustment ability and narrow application range. Dual effective control of temperature and humidity. In some occasions where the heat and humidity load changes significantly, it is difficult for the existing technology to well control the temperature and humidity required by the actual requirements.

Contents of the invention

Aiming at the deficiencies and defects of the prior art, the object of the present invention is to provide a double evaporator thermostat dehumidification air conditioning unit to realize the dual continuous adjustment of the temperature and humidity parameters of the thermostat dehumidifier outlet air, and achieve the temperature and humidity of the regulated area. The continuous and independent control of humidity expands the scope of application of the temperature-adjusting dehumidifier and improves the operating performance of the unit.

The technical solution to realize the object of the present invention is: the double evaporator temperature-regulating dehumidification air-conditioning unit of the present invention, the unit passes through two evaporators, two condensers, a compressor, a liquid storage device, a gas-liquid separator, an expansion valve, an electromagnetic The valve and the refrigerant pipeline form a double evaporator temperature regulation and dehumidification system, and adjust the air flow through the two evaporators to control the humidity of the air outlet of the unit according to the humidity content of the indoor air in the regulated area or the air intake of the unit. The regional indoor air or unit inlet air temperature is adjusted by the flow of refrigerant flowing through the two condensers to control the unit’s outlet air temperature to realize continuous and independent control of unit outlet air temperature and humidity parameters; the two evaporators have different Evaporation temperature.

The double evaporator temperature-regulating dehumidification air-conditioning unit of the present invention includes a series-connected refrigeration and dehumidification part and a compression condensation part. The compression condensation part includes a compressor for sucking gaseous refrigerant and compressing and outputting it, and a compressor connected to the exhaust port of the compressor. A three-way proportional regulating valve for refrigerant, a first condenser connected to end b of the three-way proportional regulating valve for refrigerant, a second condenser connected to end a of the three-way proportional regulating valve for refrigerant, and a second condenser connected to end a of the three-way proportional regulating valve for refrigerant. The high-pressure liquid receiver connected to the outlet of the condenser and the second condenser, the second condenser is an indoor condenser; the series refrigeration and dehumidification part includes a gas-liquid separator whose outlet is connected to the suction port of the compressor, in the series refrigeration and dehumidification The part also includes a first expansion valve whose inlet is connected with the outlet of the high-pressure liquid accumulator; a high-temperature evaporator whose inlet is connected with the outlet of the first expansion valve; a low-temperature evaporator whose outlet is connected with the inlet of the gas-liquid separator; a The flasher whose inlet is connected to the outlet of the high-temperature evaporator, the liquid-phase outlet of the flasher is connected with the first electromagnetic valve, the second expansion valve and the inlet of the low-temperature evaporator in turn through the refrigerant pipeline, and the gas-phase outlet of the flasher Divided into two parallel circuits, one is connected to the inlet of the third expansion valve, the other is connected to the inlet of the second solenoid valve, the outlet of the third expansion valve, the second solenoid valve and the outlet of the low-temperature evaporator pass through the refrigerant pipeline After parallel connection, it is connected to the inlet of the gas-liquid separator.

The double evaporator temperature-regulating dehumidification air-conditioning unit of the present invention includes a compression condensing part and a parallel refrigeration dehumidification part. The compression condensing part includes a compressor for inhaling gaseous refrigerant and compressing and outputting it, and a refrigeration unit connected to the exhaust port of the compressor. A three-way proportional regulating valve for refrigerant, a first condenser connected to end b of the three-way proportional regulating valve for refrigerant, a second condenser connected to end a of the three-way proportional regulating valve for refrigerant, and a second condenser connected to the first condenser The high-pressure liquid receiver connected to the outlet of the condenser and the second condenser, the second condenser is an indoor condenser; the parallel refrigeration and dehumidification part includes a gas-liquid separator whose outlet is connected to the suction port of the compressor, in the parallel refrigeration and dehumidification part It also includes a low-temperature expansion valve whose outlet is connected to the inlet of the low-temperature evaporator, a first expansion valve whose outlet is connected to the inlet of the high-temperature evaporator, and the inlet of the low-temperature expansion valve is connected in parallel with the inlet of the first expansion valve through a refrigerant pipeline Finally, it is connected to the outlet of the high-pressure liquid receiver; the outlet of the high-temperature evaporator is divided into two parallel paths, one path is connected to the inlet of the third expansion valve, the other path is connected to the inlet of the second solenoid valve, the third expansion valve, the second The outlet of the electromagnetic valve and the outlet of the low-temperature evaporator are connected in parallel with the inlet of the gas-liquid separator through the refrigerant pipeline.

Compared with the prior art, the present invention has significant advantages: the present invention uses a high-temperature evaporator operating under dry or slightly humid conditions and a low-temperature evaporator operating under wet conditions to cool and dehumidify the inlet air of the unit , and adjust the air volume flowing through the two evaporators to control the outlet air humidity of the unit through the three ventilation volume proportional regulating valves according to the moisture content of the inlet air, and at the same time adjust the heating capacity of the second condenser to control the outlet air temperature of the unit according to the inlet air temperature. Effectively realize the continuous and independent control of the unit's outlet air temperature and humidity, improve the temperature regulation and dehumidification performance of the unit, and meet the needs of different heat and humidity loads, effectively control the indoor temperature and humidity of the adjusted area, and improve the unit's performance. adaptability. The invention has wide application range, good adjustment performance, and can adapt to the application occasions of temperature adjustment and dehumidification in which the heat and humidity load changes in a wide range.

Description of drawings

Fig. 1 is a structural schematic diagram of a double evaporator temperature-adjusting and dehumidifying air-conditioning unit of the present invention.

Fig. 2 is another structural principle diagram of the double evaporator temperature-adjusting and dehumidifying air-conditioning unit of the present invention.

Fig. 3 is an enthalpy-humidity (i-d) diagram of the air treatment process of the double evaporator temperature-regulating and dehumidifying air-conditioning unit of the present invention.

Detailed ways

The implementation process of the present invention will be further described below in conjunction with the accompanying drawings.

The double evaporator temperature-regulating dehumidification air-conditioning unit of the present invention, the unit adjusts the air flow through the two evaporators to control the humidity of the air outlet of the unit according to the humidity content of the indoor air in the regulated area or the air intake of the unit, The air or unit inlet air temperature is adjusted by the refrigerant flow through the two condensers to control the unit outlet air temperature, realizing continuous and independent control of the unit outlet air temperature and humidity parameters.

With reference to FIG. 1 , FIG. 1 is a structural schematic diagram of a double evaporator temperature-adjusting and dehumidifying air-conditioning unit provided by the present invention. The air-conditioning unit with double evaporator temperature adjustment and dehumidification of the present invention includes a series refrigeration and dehumidification part 19 and a compression and condensation part 20, and the compression and condensation part 20 includes a compressor 1 for sucking gaseous refrigerant from the gas-liquid separator 14 and compressing and outputting it , a refrigerant three-way proportional regulating valve 2 connected to the exhaust port of the compressor 1, a first condenser 3 connected to the port b of the refrigerant three-way proportional regulating valve 2, the first condenser 3 is used to Condensation heat is discharged from the environment; a second condenser 4 is connected to port a of the refrigerant three-way proportional regulating valve 2, and the second condenser 4 is used to adjust the outlet air temperature of the unit; the refrigerant three-way proportional regulating valve 2 is used for Regulate the flow of refrigerant entering the first condenser 3 and the second condenser 4; a high-pressure accumulator 5 connected to the outlet of the first condenser 3 and the second condenser 4, the high-pressure accumulator 5 is used to store high pressure Liquid refrigerant, the second condenser 4 is an indoor condenser; the series refrigeration and dehumidification part 19 includes a gas-liquid separator 14 with an outlet connected to the suction port of the compressor 1, and the gas-liquid separator 14 is used for refrigerant gas-liquid Separation; the first expansion valve 6 with an inlet connected to the outlet of the high-pressure accumulator 5 is also included in the series refrigeration dehumidification part 19; a high-temperature evaporator 7 with an inlet connected with the outlet of the first expansion valve 6, the high-temperature evaporator 7 Used to cool the air; a low-temperature evaporator 11 with an outlet connected to the inlet of the gas-liquid separator 14, and the low-temperature evaporator 11 is used to cool and dehumidify the air; a flasher 8 with an inlet connected to the outlet of the high-temperature evaporator 7 , the liquid phase outlet of the flasher 8 is connected to the inlet of the first electromagnetic valve 9, the second expansion valve 10 and the low-temperature evaporator 11 in turn through the refrigerant pipeline, and the gas phase outlet of the flasher 8 is divided into two parallel paths, One path is connected to the inlet of the third expansion valve 13, and the other path is connected to the inlet of the second solenoid valve 12. The outlets of the third expansion valve 13, the second solenoid valve 12, and the outlet of the low-temperature evaporator 11 are connected in parallel through the refrigerant pipeline. It is connected to the inlet of the gas-liquid separator 14. A complete dual evaporator temperature-regulating and dehumidifying cycle system is formed through the connection of the above-mentioned components.

With reference to FIG. 2 , FIG. 2 is a structural schematic diagram of another double evaporator temperature-regulating and dehumidifying air-conditioning unit provided by the present invention. The air-conditioning unit with double evaporator temperature adjustment and dehumidification of the present invention includes a compression condensing part 20 and a parallel refrigeration dehumidification part 21. The compression condensing part 20 includes a compressor 1 for sucking gaseous refrigerant from the gas-liquid separator 14 and compressing and outputting it. , a refrigerant three-way proportional regulating valve 2 connected to the exhaust port of the compressor 1, a first condenser 3 connected to the port b of the refrigerant three-way proportional regulating valve 2, the first condenser 3 is used to Condensation heat is discharged from the environment; a second condenser 4 is connected to port a of the refrigerant three-way proportional regulating valve 2, and the second condenser 4 is used to adjust the outlet air temperature of the unit; the refrigerant three-way proportional regulating valve 2 is used for Regulate the flow of refrigerant entering the first condenser 3 and the second condenser 4; a high-pressure accumulator 5 connected to the outlet of the first condenser 3 and the second condenser 4, the high-pressure accumulator 5 is used to store high pressure Liquid refrigerant, the second condenser 4 is an indoor condenser; the parallel refrigeration and dehumidification part 21 includes a gas-liquid separator 14 whose outlet is connected to the suction port of the compressor 1, and the gas-liquid separator 14 is used for the refrigerant to carry out gas-liquid Separation; in the parallel freezing and dehumidifying part 21, a low-temperature expansion valve 17 whose outlet is connected with the inlet of the low-temperature evaporator 11 is also included, and the low-temperature evaporator 11 is used for cooling and dehumidifying air; an outlet is connected with the inlet of the high-temperature evaporator 7 An expansion valve 6, the high-temperature evaporator 7 is used to cool the air, the inlets of the high-temperature evaporator 7 and the low-temperature evaporator 11 are respectively connected with the outlet of the first expansion valve 6 and the outlet of the low-temperature expansion valve 17, and the outlet of the low-temperature expansion valve 17 The inlet and the inlet of the first expansion valve 6 are connected in parallel with the outlet of the high-pressure liquid accumulator 5 through the refrigerant pipeline; The other path is connected to the inlet of the second solenoid valve 12, and the third expansion valve 13, the outlet of the second solenoid valve 12 and the outlet of the low-temperature evaporator 11 are connected in parallel with the inlet of the gas-liquid separator 14 through the refrigerant pipeline. A complete dual evaporator temperature-regulating and dehumidifying cycle system is formed through the connection of the above-mentioned components.

The double-evaporator temperature-regulating and dehumidifying air-conditioning unit of the present invention also includes a three-air passage 15, the high-temperature evaporator 7 and the low-temperature evaporator 11 are respectively placed on the two branch pipelines of the three-air passage 15, and the second condenser 4 is installed on the high-temperature The evaporator 7 and the downstream three-air channel 15 of the low-temperature evaporator 11 are in the confluent pipe section.

The double-evaporator temperature-adjusting and dehumidifying air-conditioning unit of the present invention also includes a three-volume proportional regulating valve 16, and the three-volume proportional regulating valve 16 is installed in the inlet ducts of the high-temperature evaporator 7 and the low-temperature evaporator 11 to regulate the flow through Air volume of high temperature evaporator 7 and low temperature evaporator 11.

In the double evaporator temperature-regulating dehumidification air-conditioning unit of the present invention, the evaporation temperature in the high-temperature evaporator 7 is higher than that in the low-temperature evaporator 11 .

The double evaporator temperature-regulating and dehumidifying air-conditioning unit of the present invention, the high-temperature evaporator 7 mainly bears the cooling load in the regulated area, and cools the air flowing through according to the dry working condition or slightly humid working condition; the low-temperature evaporator 11 simultaneously undertakes being cooled. Adjust the cooling load and humidity load in the area, and operate according to the wet condition to cool and dehumidify the air passing through.

The double evaporator temperature-regulating dehumidification air-conditioning unit of the present invention, the second condenser 4 heats and adjusts the temperature of the mixed air flowing through the high-temperature evaporator 7 and the low-temperature evaporator 11, and adjusts the second condenser through the refrigerant three-way proportional regulating valve 2. Condensation heat of condenser 4.

In the double evaporator temperature-regulating dehumidification air-conditioning unit of the present invention, the first expansion valve 6, the second expansion valve 10, the third expansion valve 13, and the low-temperature expansion valve 17 adopt thermal expansion valves or electronic expansion valves.

With reference to FIG. 3 , FIG. 3 is an enthalpy-humidity (id) diagram of the air treatment process of a double evaporator temperature-regulating dehumidification air-conditioning unit provided by the present invention. Point N in the figure is the indoor state point of the adjusted area, which corresponds to temperature t _set and moisture content d _set ; point _E1 is the air state point at the outlet of high-temperature evaporator 7, which corresponds to temperature t ₁ and humidity content The amount is d _set ; point E ₂ is the outlet air state point of low temperature evaporator 11, which corresponds to temperature t ₂ and moisture content d ₂ ; point C is the mixture of air treated by high temperature evaporator 7 and low temperature evaporator 11 State point, which corresponds to temperature t _c and moisture content d _c ; point S is the air outlet state point of the unit, which corresponds to temperature t _s and moisture content d _c . N→E ₁ is the air treatment process line of the high temperature evaporator 7; N→E ₂ is the air treatment process line of the low temperature evaporator 11; E ₂ →C←E ₁ is the air mixing at the outlet of the high temperature evaporator 7 and the low temperature evaporator 11 Process line; C → S is the temperature adjustment process line of the second condenser 4; S → N is the heat-humidity ratio line of the adjusted area.

Example 1:

Fig. 1 is a structural principle diagram of a double evaporator temperature-adjusting and dehumidifying air-conditioning unit provided by the present invention. According to Figure 1, connect the exhaust port of compressor 1 to the inlet of refrigerant three-way proportional regulating valve 2 through the refrigerant pipeline, and connect the a port and b port of refrigerant three-way proportional regulating valve 2 to the second condensing port respectively. The inlet of the first condenser 4 and the inlet of the first condenser 1 are connected, and the outlet of the first condenser 3 and the outlet of the second condenser 4 are connected in parallel through the refrigerant pipeline and then connected to the inlet of the high-pressure accumulator 5 to form a regulator The compression condensing part 20 of the warm dehumidification unit. In the series freezing and dehumidifying part 19, the inlet of the high-temperature evaporator 7 is connected with the outlet of the high-pressure accumulator 5 through the first expansion valve 6, and the outlet of the high-temperature evaporator 7 is connected with the inlet of the flasher 8, and the flasher The liquid-phase outlet of 8 is connected to the inlet of the low-temperature evaporator 11 through the first electromagnetic valve 9 and the second expansion valve 10 in turn, and the gas-phase outlet of the flasher 8 is divided into two paths in parallel with the third expansion valve 13 and the second electromagnetic valve 13 respectively. After the valve 12 is connected, the outlet of the low-temperature evaporator 11 is connected in parallel to the inlet of the gas-liquid separator 14 , and the outlet of the gas-liquid separator 14 is connected to the suction port of the compressor 1 . At the same time, the high-temperature evaporator 7 and the low-temperature evaporator 11 are respectively installed on the two branch pipelines of the three-air passage 15, and the low-temperature condenser 4 is installed on the confluence pipe section of the downstream three-air passage 15 of the high-temperature evaporator 7 and the low-temperature evaporator 11 Inside, and the three-air flow proportional regulating valve 16 is installed at the entrance of the three-air passage 15. The first expansion valve 6 , the second expansion valve 10 and the third expansion valve 13 are thermal expansion valves.

The double evaporator temperature-regulating dehumidification air-conditioning unit sets the evaporation temperature of the low-temperature evaporator 11 as t _el and the evaporation temperature of the high-temperature evaporator 7 as _teh according to the indoor air temperature and humidity control parameters, and makes the outer surface of the low-temperature evaporator 11 The temperature is lower than the dew point temperature t _dew of the inlet air of the unit, and the temperature of the outer surface of the high-temperature evaporator 7 is not lower than the dew point temperature t _dew of the inlet air of the unit. In the design working condition, the three-way proportional regulating valve 16 and the refrigerant three-way proportional regulating valve 2 are in the middle opening, the first solenoid valve 9 is opened, and the second solenoid valve 12 is closed. During the temperature regulation and dehumidification operation, the air volume flowing through the high-temperature evaporator 7 and the low-temperature evaporator 11 is adjusted according to the humidity content of the inlet air of the unit to control the outlet air humidity of the unit, and the refrigerant flow rate of the second condenser 4 is adjusted according to the inlet air temperature To control the outlet air temperature of the unit, the continuous and independent control of the indoor temperature and humidity of the regulated area is realized.

(a) Air humidity control of the unit

When the unit is running in the design working condition, the three-ventilation proportional regulating valve 16 is in the middle opening, the first solenoid valve 9 is opened, and the second solenoid valve 12 is closed. When the moisture content d _{in of} the inlet air of the unit is lower than the set value d _set of the indoor air moisture content, adjust the opening degree of the three-ventilation proportional control valve 16 to reduce the air volume of the low-temperature evaporator 11 and increase the air volume of the high-temperature evaporator 7 air volume to reduce the dehumidification capacity of the unit to control the _indoor humidity _in the adjusted area to reach the set value; Close the first electromagnetic valve 9, open the second electromagnetic valve 12, and adjust the three ventilation volume proportional control valves 16, so that all the air flows through the high temperature evaporator 7, and the unit cools down to run under dry conditions. When the moisture content d _{in of} the inlet air of the unit is higher than the set value d _set of the indoor air moisture content, adjust the opening degree of the three ventilation volume proportional regulating valve 16 to increase the air volume of the low temperature evaporator 11 and reduce the high temperature evaporation The air volume of the device 7 increases the dehumidification capacity of the unit to control the indoor humidity of the adjusted area to reach the set value; when the moisture content d _in of the inlet air of the unit reaches or exceeds the set upper limit d of the indoor air humidity At _max , the first solenoid valve 9 is opened, the second solenoid valve 12 is closed, and the three-ventilation volume proportional regulating valve 16 is adjusted so that all air flows through the low-temperature evaporator 11, and the unit operates in cooling and dehumidification under wet conditions.

(b) Control of the outlet air temperature of the unit

When the air temperature t _in at the inlet of the unit is lower than the set value t _set of the indoor air temperature, adjust the opening of the refrigerant three-way proportional regulating valve 2 to increase the refrigerant flow rate of the second condenser 4 and reduce the first condensation Refrigerant flow of device 3 to increase the heating capacity of the unit to control the indoor air temperature _in the regulated area to reach the set _value ; Adjust the refrigerant three-way proportional regulating valve 2 to make all the refrigerant flow through the second condenser 4, and use all the condensation heat of the unit to heat the mixed air processed by the high temperature evaporator 7 and the low temperature evaporator 11. When the inlet air temperature t _in of the unit is higher than the set value t _set of the indoor air temperature, the opening of the refrigerant three-way proportional regulating valve 2 is adjusted to reduce the refrigerant flow rate of the second condenser 4 and increase the first condensation The refrigerant flow rate of the device 3 is reduced to reduce the heating capacity of the unit to control the indoor air temperature in the regulated area to reach the set value.

Example 2:

Fig. 2 is a structural principle diagram of another double evaporator temperature-regulating and dehumidifying air-conditioning unit provided by the present invention. According to Figure 2, connect the exhaust port of compressor 1 to the inlet of refrigerant three-way proportional regulating valve 2 through the refrigerant pipeline, and connect the a port and b port of refrigerant three-way proportional regulating valve 2 to the second condensing port respectively. The inlet of the first condenser 4 and the inlet of the first condenser 1 are connected, and the outlet of the first condenser 3 and the outlet of the second condenser 4 are connected in parallel through the refrigerant pipeline and then connected to the inlet of the high-pressure accumulator 5 to form a regulator The compression condensing part 20 of the warm dehumidification unit. The outlet of the high-pressure accumulator 5 is divided into two parallel paths, which are respectively connected to the inlet of the low-temperature evaporator 11 and the inlet of the high-temperature evaporator 7 through the low-temperature expansion valve 17 and the first expansion valve 6 in the parallel refrigeration and dehumidification part 21, and the high-temperature evaporation The outlet of the device 7 is divided into two parallel paths, which are respectively connected with the third expansion valve 13 and the second electromagnetic valve 12, and then connected with the outlet of the low-temperature evaporator 11 in parallel to the inlet of the gas-liquid separator 14, and the gas-liquid separator 14 The outlet is connected with the suction port of compressor 1. At the same time, the high-temperature evaporator 7 and the low-temperature evaporator 11 are respectively installed on the two branch pipelines of the three-air passage 15, and the low-temperature condenser 4 is installed on the confluence pipe section of the downstream three-air passage 15 of the high-temperature evaporator 7 and the low-temperature evaporator 11 Inside, and the three-air flow proportional regulating valve 16 is installed at the entrance of the three-air passage 15. The first expansion valve 6 , the third expansion valve 13 and the low temperature expansion valve 17 adopt electronic expansion valves.

The double evaporator temperature-regulating dehumidification air-conditioning unit sets the evaporation temperature of the low-temperature evaporator 11 as t _el and the evaporation temperature of the high-temperature evaporator 7 as _teh according to the indoor air temperature and humidity control parameters, and makes the outer surface of the low-temperature evaporator 11 The temperature is lower than the dew point temperature t _dew of the inlet air of the unit, and the temperature of the outer surface of the high-temperature evaporator 7 is not lower than the dew point temperature t _dew of the inlet air of the unit. In the design working condition, the three-way proportional regulating valve 16 and the refrigerant three-way proportional regulating valve 2 are in the middle opening, and the second electromagnetic valve 12 is closed. During temperature regulation and dehumidification operation, adjust the air volume flowing through the high-temperature evaporator 7 and low-temperature evaporator 11 according to the moisture content of the inlet air of the unit to control the outlet air humidity of the unit, and adjust the refrigerant flow control of the second condenser 4 according to the inlet air temperature The outlet air temperature of the unit is used to realize continuous and independent control of the indoor temperature and humidity of the adjusted area.

(a) Air humidity control of the unit

When the moisture content d _{in of} the inlet air of the unit is lower than the set value d _set of the indoor air moisture content, adjust the opening degree of the three ventilation volume proportional regulating valve 16 to reduce the air volume of the low temperature evaporator 11 and increase the high temperature evaporation The air volume of the device 7 reduces the dehumidification capacity of the unit to control the indoor humidity of the adjusted area to reach the set value; when the moisture content d _in of the inlet air of the unit reaches or is less than the set lower limit value d _min of the indoor air moisture content , open the second solenoid valve 12, and adjust the three ventilation volume proportional control valves 16, so that all the air flows through the high-temperature evaporator 7, and the unit cools down to run under dry conditions. When the moisture content d _{in of} the inlet air of the unit is higher than the set value d _set of the indoor air moisture content, adjust the opening degree of the three ventilation volume proportional regulating valve 16 to increase the air volume of the low temperature evaporator 11 and reduce the high temperature evaporation The air volume of the device 7 increases the dehumidification capacity of the unit to control the indoor humidity of the adjusted area to reach the set value; when the moisture content d _in of the inlet air of the unit reaches or exceeds the set upper limit d of the indoor air humidity At _max , the second solenoid valve 12 is closed, and the three-ventilation volume proportional regulating valve 16 is adjusted so that all air flows through the low-temperature evaporator 11, and the unit operates under a wet working condition with cooling and dehumidification.

(b) Control of the outlet air temperature of the unit

The control method of the outlet air temperature of the unit is the same as in Embodiment 1.

When the temperature t _in of the inlet air of the unit is lower than the set value t _set of the indoor air temperature, adjust the opening of the refrigerant three-way proportional regulating valve 2 to increase the refrigerant flow rate of the second condenser 4 and reduce the first condensation Refrigerant flow of device 3 to increase the heating capacity of the unit to control the indoor air temperature _in the regulated area to reach the set _value ; Adjust the refrigerant three-way proportional regulating valve 2 to make all the refrigerant flow through the second condenser 4, and use all the condensation heat of the unit to heat the mixed air processed by the high temperature evaporator 7 and the low temperature evaporator 11. When the inlet air temperature t _in of the unit is higher than the set value t _set of the indoor air temperature, the opening of the refrigerant three-way proportional regulating valve 2 is adjusted to reduce the refrigerant flow rate of the second condenser 4 and increase the first condensation The refrigerant flow rate of the device 3 is reduced to reduce the heating capacity of the unit to control the indoor air temperature in the regulated area to reach the set value.

Claims (9)

1, a kind of double evaporators temperature adjusting and dehumidifying air-conditioning unit, it is characterized in that: this unit is by two evaporimeters, two condensers, compressor, reservoir, gas-liquid separator, expansion valve, magnetic valve and refrigerant line constitute double evaporators temperature adjusting and dehumidifying system, and according to the air-out humidity of being regulated the air flow control unit of two evaporimeters of flowing through by the water capacity of regional room air of accent or unit air intake, according to being transferred regional room air or unit EAT to regulate the leaving air temp of the refrigerant flow control unit of two condensers of flowing through, realize the continuous of unit leaving air temp and humidity parameter, independent control; Described two evaporimeters have different evaporating temperatures.

2, double evaporators temperature adjusting and dehumidifying air-conditioning unit according to claim 1, comprise series connection freeze drying part (19) and compression condensation part (20), compression condensation part (20) comprises that is used to a compressor (1) that sucks gaseous refrigerant and compress output, a cold-producing medium threeway ratio adjusting valve (2) that links to each other with the exhaust outlet of compressor (1), first condenser (3) that is connected with the b port of cold-producing medium threeway ratio adjusting valve (2), second condenser (4) that is connected with a port of cold-producing medium threeway ratio adjusting valve (2), a high pressure reservoir (5) that links to each other with the outlet of first condenser (3) and second condenser (4), it is characterized in that: second condenser (4) is indoor condenser; Series connection freeze drying part (19) comprises the gas-liquid separator (14) that an outlet links to each other with the air entry of compressor (1), also comprises first expansion valve (6) that an inlet is connected with the outlet of high pressure reservoir (5) in series connection freeze drying part (19); The high-temperature evaporator (7) that inlet is connected with the outlet of first expansion valve (6); The cryogenic vaporizer (11) that outlet is connected with gas-liquid separator (14) inlet; The flash evaporation (8) that inlet is connected with the outlet of high-temperature evaporator (7), the outlet of the liquid phase of flash evaporation (8) by refrigerant line successively with first magnetic valve (9), the inlet of second expansion valve (10) and cryogenic vaporizer (11) connects, the gaseous phase outlet of flash evaporation (8) is divided into two-way in parallel, one the tunnel is connected with the inlet of the 3rd expansion valve (13), another road is connected with the inlet of second magnetic valve (12), the 3rd expansion valve (13), the outlet of the outlet of second magnetic valve (12) and cryogenic vaporizer (11) is connected with the inlet of gas-liquid separator (14) after by the refrigerant line parallel connection.

3, by the described double evaporators temperature adjusting and dehumidifying of claim 1 air-conditioning unit, comprise compression condensation part (20) and freeze drying in parallel part (21), compression condensation part (20) comprises that is used to a compressor (1) that sucks gaseous refrigerant and compress output, a cold-producing medium threeway ratio adjusting valve (2) that links to each other with compressor (1) exhaust outlet, first condenser (3) that is connected with the b end of cold-producing medium threeway ratio adjusting valve (2), second condenser (4) that is connected with a end of cold-producing medium threeway ratio adjusting valve (2), a high pressure reservoir (5) that links to each other with the outlet of first condenser (3) and second condenser (4), it is characterized in that: second condenser (4) is indoor condenser; Freeze drying part in parallel (21) comprises the gas-liquid separator (14) that an outlet links to each other with the air entry of compressor (1), in freeze drying part in parallel (21), also comprise the low-temperature expansion valve (17) that an outlet links to each other with the inlet of cryogenic vaporizer (11), first expansion valve (6) that outlet links to each other with the inlet of high-temperature evaporator (7), the inlet of the inlet of low-temperature expansion valve (17) and described first expansion valve (6) are connected with the outlet of high pressure reservoir (5) after by the refrigerant line parallel connection; The outlet of high-temperature evaporator (7) is divided into two-way in parallel, one the tunnel is connected with the inlet of the 3rd expansion valve (13), another road is connected with the inlet of second magnetic valve (12), and the outlet of the 3rd expansion valve (13), second magnetic valve (12) and the outlet of cryogenic vaporizer (11) are connected with the inlet of gas-liquid separator (14) after by the refrigerant line parallel connection.

4, according to claim 1,2 or 3 described double evaporators temperature adjusting and dehumidifying air-conditioning units, it is characterized in that: double evaporators temperature adjusting and dehumidifying air-conditioning unit also comprises one three ventilating duct (15), high-temperature evaporator (7) and cryogenic vaporizer (11) place respectively on two branch lines of three ventilating ducts (15), and second condenser (4) is installed in the interflow pipeline section of downstream three ventilating ducts (15) of high-temperature evaporator (7) and cryogenic vaporizer (11).

5, according to claim 1,2 or 3 described double evaporators temperature adjusting and dehumidifying air-conditioning units, it is characterized in that: double evaporators temperature adjusting and dehumidifying air-conditioning unit also comprises one three ventilation ratio adjusting valve (16), three ventilation ratio adjusting valves (16) are installed in the inlet air channel of high-temperature evaporator (7) and cryogenic vaporizer (11), in order to the flow through air quantity of high-temperature evaporator (7) and cryogenic vaporizer (11) of adjusting.

6, according to claim 1,2 or 3 described double evaporators temperature adjusting and dehumidifying air-conditioning units, it is characterized in that: the evaporating temperature in the high-temperature evaporator (7) is higher than the evaporating temperature in the cryogenic vaporizer (11).

7, according to claim 1,2 or 3 described double evaporators temperature adjusting and dehumidifying air-conditioning units, it is characterized in that: high-temperature evaporator (7) is mainly born the refrigeration duty of being transferred in the zone, by dry cooling condition or the operation of little wet cooling condition to the air of the flowing through processing of lowering the temperature; Cryogenic vaporizer (11) is born the refrigeration duty and the humidity load of being transferred in the zone simultaneously, by the wet cooling condition operation air of flowing through is carried out cool-down dehumidification and handles.

8, according to claim 1,2 or 3 described double evaporators temperature adjusting and dehumidifying air-conditioning units, it is characterized in that: second condenser (4) heats the temperature adjustment processing to high-temperature evaporator of flowing through (7) and the mixed air of cryogenic vaporizer (11), and regulates the condenser heat of second condenser (4) by cold-producing medium threeway ratio adjusting valve (2).

9, according to claim 1,2 or 3 described a kind of double evaporators temperature adjusting and dehumidifying air-conditioning units, it is characterized in that: first expansion valve (6), second expansion valve (10), the 3rd expansion valve (13), low-temperature expansion valve (17) adopt heating power expansion valve or electric expansion valve.

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