WO2020181785A1 - 热泵干燥系统和控制方法 - Google Patents

热泵干燥系统和控制方法 Download PDF

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Publication number
WO2020181785A1
WO2020181785A1 PCT/CN2019/114228 CN2019114228W WO2020181785A1 WO 2020181785 A1 WO2020181785 A1 WO 2020181785A1 CN 2019114228 W CN2019114228 W CN 2019114228W WO 2020181785 A1 WO2020181785 A1 WO 2020181785A1
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WIPO (PCT)
Prior art keywords
way valve
drying
branch
compression cylinder
heat pump
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2019/114228
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English (en)
French (fr)
Inventor
吕如兵
郑波
梁祥飞
汤康
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Filing date
Publication date
Application filed by Gree Electric Appliances Inc of Zhuhai filed Critical Gree Electric Appliances Inc of Zhuhai
Publication of WO2020181785A1 publication Critical patent/WO2020181785A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B31/00—Compressor arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
    • F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements for supplying or controlling air or other gases for drying solid materials or objects
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements for supplying or controlling air or other gases for drying solid materials or objects
    • F26B21/30—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/33—Humidity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements for supplying or controlling air or other gases for drying solid materials or objects
    • F26B21/30—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/37—Velocity of flow; Quantity of flow

Definitions

  • the present disclosure belongs to the technical field of heat pumps, and specifically relates to a heat pump drying system and a control method.
  • the existing heat pump drying device mainly adopts an open system.
  • the basic principle of the open system is: after the outdoor evaporator absorbs heat, the heat is transferred to the drying chamber through the indoor condenser, so that materials with higher drying temperature requirements can be dried.
  • a heat pump drying system including: a compressor, a drying device, a drying condenser, an outdoor evaporator, and an indoor evaporator, the drying condenser and the compressor exhaust
  • the air end is connected to heat the air in the drying device
  • the outdoor evaporator is connected to the suction end of the compressor to absorb heat from the outside of the drying device.
  • the indoor evaporator It is connected with the suction end of the compressor to dehumidify the air in the drying device.
  • the compressor includes a first compression cylinder and a second compression cylinder, and the first end of the first branch where the outdoor evaporator is located is in communication with the suction end of the first compression cylinder, so The first end of the second branch where the indoor evaporator is located is in communication with the suction end of the second compression cylinder.
  • the exhaust gases of the first compression cylinder and the second compression cylinder are mixed and discharged from the compressor through the discharge end of the compressor.
  • a first throttling device is provided on the first branch road, and the first throttling device is located on the upstream side of the outdoor evaporator along the refrigerant flow direction; on the second branch road A second throttling device is provided, and the second throttling device is located on the upstream side of the indoor evaporator along the refrigerant flow direction; the heat pump drying system also includes a first fan that radiates heat to the outdoor evaporator.
  • the drying device includes a drying room in which materials to be dried are arranged; the drying device further includes an air duct, which is connected to the drying room, The air duct makes the air in the air duct exchange heat with the refrigerant in the indoor evaporator, and the air duct makes the air in the air duct exchange heat with the refrigerant in the drying condenser.
  • the drying device further includes a second fan arranged in communication with the air duct; the drying condenser is located on the downstream side of the indoor evaporator along the air flow direction in the air duct.
  • it further includes: a bypass passage communicating with the air duct, the first end of the bypass passage is located on the upstream side of the indoor evaporator along the air flow direction, and the first end of the bypass passage The two ends are located on the downstream side of the indoor evaporator along the air flow direction, and an air volume regulating valve is also provided in the bypass passage.
  • it further includes: a first two-way valve arranged on the first branch, the first two-way valve located between the outdoor evaporator and the suction end of the first compression cylinder ; A third two-way valve disposed on the second branch, the third two-way valve is located between the indoor evaporator and the suction end of the second compression cylinder; and the first branch The third branch connected to the second branch, the first end of the third branch is located between the first two-way valve and the suction end of the first compression cylinder, the third The second end of the branch is located between the third two-way valve and the suction end of the second compression cylinder, and a second two-way valve is also provided on the third branch.
  • it further includes: a first three-way valve arranged on the first branch, a first end of the first three-way valve communicating with the outdoor evaporator, the first three-way valve
  • the second end of the second three-way valve is in communication with the suction end of the first compression cylinder;
  • the second three-way valve is arranged on the second branch, and the first end of the second three-way valve is connected to the indoor evaporator Connected, the second end of the second three-way valve is in communication with the suction end of the second compression cylinder;
  • the third end of the first three-way valve is in communication with the third end of the second three-way valve .
  • the second end of the outdoor evaporator communicates with the second end of the drying condenser
  • the second end of the indoor evaporator communicates with the second end of the drying condenser
  • the The first end of the drying condenser communicates with the discharge end of the compressor.
  • the exhaust end includes a first exhaust port communicating with the first compression cylinder and a second exhaust port communicating with the second compression cylinder;
  • the heat pump drying system further It includes an outdoor condenser, the first end of the outdoor condenser is in communication with the second exhaust port, and the second end of the outdoor condenser is in communication with the second end of the indoor evaporator; the dry condenser The first end of the drying condenser is in communication with the first exhaust port, and the first end of the drying condenser is in communication with the second end of the outdoor evaporator.
  • it further includes: a fourth branch connected to the outdoor condenser and the second compression cylinder, and a fourth two-way valve is provided on the fourth branch; and the drying condenser
  • a fifth two-way valve is also provided on the sixth branch between the exhaust port of the first compression cylinder.
  • it further includes: a fourth branch communicating with the outdoor condenser and the second compression cylinder, a third three-way valve is provided on the fourth branch, and the third three-way valve
  • the first end of the third three-way valve is in communication with the outdoor condenser, the second end of the third three-way valve is in communication with the exhaust port of the second compression cylinder; it is in communication with the drying condenser and the first compression cylinder
  • the fifth branch is provided with a fourth three-way valve, the first end of the fourth three-way valve is in communication with the drying condenser, and the second end of the fourth three-way valve It communicates with the exhaust port of the first compression cylinder; the third end of the third three-way valve is communicated with the third end of the fourth three-way valve.
  • the first compression cylinder and the second compression cylinder are arranged up and down, the second compression cylinder is located below the first compression cylinder, and an oil separator is also provided on the fourth branch.
  • the bottom of the oil separator communicates with the bottom of the compressor through an oil circuit, and an oil return control valve and an oil return capillary are provided on the oil circuit.
  • a control method of a heat pump drying system which uses the heat pump drying system described in any one of the preceding items to perform dehumidification control on the drying device.
  • the heat pump drying system when the heat pump drying system includes a first two-way valve, a second two-way valve, and a third two-way valve: when the drying device needs to be heated and dried, control the The first two-way valve and the second two-way valve are opened, and the third two-way valve is controlled to close; when the drying device needs to be heated and dehumidified, the first two-way valve and the first two-way valve are controlled The three-two-way valve is opened, and the second two-way valve is controlled to close; when the drying device needs to be dehumidified at a constant temperature, the second two-way valve and the third two-way valve are controlled to open to control the The first two-way valve is closed.
  • the heat pump drying system when the heat pump drying system includes a first three-way valve and a second three-way valve: when the drying device needs to be heated and dried, control the first three-way valve The first end is connected with the second end and the third end, and the first end of the second three-way valve is controlled to be closed, and the second end and the third end are connected; in the case that the drying device needs to be heated and dehumidified, Control the first end of the first three-way valve to communicate with the second end and close the third end, control the first end of the second three-way valve to communicate with the second end, and the third end to close; In the case of the drying device performing constant temperature dehumidification, the first end of the first three-way valve is controlled to be closed, the second end and the third end are connected, and the first end, the second end and the first end of the second three-way valve are controlled. All three ends are connected.
  • the drying device when the heat pump drying system includes an outdoor condenser, a fourth two-way valve, a fifth two-way valve, and a sixth two-way valve: the drying device needs to be heated and dried or when needed In the case of heating and dehumidifying the drying device, control the fifth two-way valve and the sixth two-way valve to open, and control the fourth two-way valve to close; when the drying device needs to be dehumidified at a constant temperature Control the fourth two-way valve and the sixth two-way valve to open, and control the fifth two-way valve to close; when the drying device needs to be cooled and dehumidified, the second two-way valve is controlled The valve and the third two-way valve are opened, the first two-way valve is controlled to close, the fourth two-way valve and the fifth two-way valve are controlled to open, and the sixth two-way valve is controlled to close.
  • the heat pump drying system includes an outdoor condenser, a third three-way valve, and a fourth three-way valve: when the drying device needs to be heated and dried or the drying device needs to be dried In the case of heating and dehumidification, the second end and the third end of the third three-way valve are controlled to communicate, and the first end is closed, and the first end, the second end, and the third end of the fourth three-way valve are all controlled.
  • the first end and the second end of the third three-way valve are controlled to communicate, and the third end is closed, and the first end of the fourth three-way valve is controlled It is connected to the second end and the third end is closed; in the case that the drying device needs to be cooled and dehumidified, the first end, the second end and the third end of the third three-way valve are all connected to control the The first end of the fourth three-way valve is closed, and the second end is communicated with the third end.
  • the air volume adjustment valve is controlled to close in the early stage of drying, so that all air passes through the indoor evaporator in the air duct for heat exchange; In the middle and late stages of drying, the air volume regulating valve is controlled to open, so that part of the air passes through the indoor evaporator in the air duct for heat exchange, and the other part of the air is bypassed through the bypass passage.
  • Fig. 1 is a schematic structural diagram of a heat pump drying system according to an embodiment of the present disclosure
  • Figure 2 is a schematic structural diagram of a heat pump drying system according to another embodiment of the present disclosure.
  • FIG. 3 is a schematic structural diagram of a heat pump drying system according to another embodiment of the present disclosure.
  • FIG. 4 is a schematic structural diagram of a heat pump drying system according to another embodiment of the present disclosure.
  • Fig. 5 is a schematic structural diagram of a heat pump drying system according to another embodiment of the present disclosure.
  • the inventor found through research that in the above-mentioned open system, high-temperature humid air needs to be discharged to the outside during the drying process to remove moisture, resulting in waste of heat and pollution of the surrounding environment.
  • the present disclosure provides a solution that can eliminate the need to discharge high-temperature humid air to the outside during the drying process.
  • Fig. 1 is a schematic structural diagram of a heat pump drying system according to an embodiment of the present disclosure.
  • the heat pump drying system includes: a compressor 1, a drying device 100, a drying condenser 21, an outdoor evaporator 41, and an indoor evaporator 42.
  • the drying condenser 21 communicates with the exhaust end of the compressor 1 so as to To heat the air in the drying device 100, the outdoor evaporator 41 is connected to the suction end of the compressor 1 to absorb heat from the outside of the drying device 100, and the indoor evaporator 42 is connected to the suction end of the compressor 1. In order to dehumidify the air in the drying device 100.
  • the present disclosure divides the evaporator into an indoor evaporator and an outdoor evaporator.
  • the indoor evaporator is arranged inside the drying device, and the outdoor evaporator is arranged in the external environment of the drying device, that is, one evaporator is installed inside and outside the drying device. It can not only ensure that the system can not only recover the latent heat of indoor dehumidification, but also meet the process requirements of the temperature rise of the dried material, and realize the heating and dehumidification requirements in the drying device, which can effectively avoid heat waste and environmental pollution while controlling
  • the drying temperature can meet the heating demand without adding auxiliary electric heating.
  • the compressor 1 includes a first compression cylinder 11 and a second compression cylinder 12.
  • the first end of the first branch 201 where the outdoor evaporator 41 is located is connected to the first compression cylinder 11
  • the suction end is connected
  • the first end of the second branch 202 where the indoor evaporator 42 is located is connected to the suction end of the second compression cylinder 12.
  • the two evaporating temperatures are connected to each other, corresponding to different suction pressures, which can effectively ensure the energy efficiency of the system; and the cylinder of the compressor is set inside the same shell (that is, the use of double suction single row or double suction double row It can effectively avoid the uneven oil return problem when the compressors are connected in parallel.
  • the compressor 1 includes a common exhaust port, and the exhaust gas of the first compression cylinder 11 and the second compression cylinder 12 are mixed and discharged from the compressor through the common exhaust port. .
  • a first throttle device 31 is provided on the first branch 201, and the first throttle device 31 is located on the upstream side of the outdoor evaporator 41 along the refrigerant flow direction;
  • a second throttling device 32 is provided on the second branch 202, and the second throttling device 32 is located on the upstream side of the indoor evaporator 42 along the refrigerant flow direction.
  • the heat pump drying system further includes a first fan 8 for dissipating heat to the outdoor evaporator 41.
  • the refrigerant before flowing through the outdoor evaporator can be throttled and depressurized, so that the refrigerant can absorb heat after entering the outdoor evaporator, and the second throttling device can be used to reduce the flow through the room.
  • the refrigerant before the evaporator undergoes throttling and pressure reduction treatment, so that the refrigerant can absorb heat after entering the indoor evaporator, and the heat exchange effect and heat exchange degree of the outdoor evaporator can be controlled by the first fan.
  • the drying device 100 includes a drying room 6 in which materials to be dried are arranged; the drying device 100 also includes an air duct 110, the air duct 110 and the drying room 6
  • the air duct 110 is in the indoor evaporator 42 so that the air in the air duct exchanges heat with the refrigerant.
  • the air duct 110 penetrates the indoor evaporator 42.
  • the air duct 110 exchanges heat with the refrigerant in the air duct in the drying condenser 21.
  • the air duct 110 runs through the drying condenser 21.
  • the material to be dried can be placed through the drying room.
  • the air in the air duct is heated by drying and enters the drying room to dry and heat the material.
  • the air duct exchanges heat with the refrigerant in the indoor evaporator to enable the air to be heated. Dehumidification at this place, the air duct exchanges heat with the refrigerant in the drying condenser, so that the air can be heated there.
  • the drying device 100 further includes a second fan 5 arranged in communication with the air duct 110.
  • the drying condenser 21 is located on the downstream side of the indoor evaporator 42 along the air flow direction in the air duct 110.
  • the setting of a second fan can provide a circulating air flow to promote the air flow through the drying room and the air duct.
  • the drying condenser is located downstream of the indoor evaporator, so that the air is first sucked in the indoor evaporator. After heating (ie dehumidification), it enters into the drying condenser for heating and drying to complete the function and effect of dehumidification and drying.
  • the air duct 110 communicates with the bypass passage 70.
  • the first end of the bypass passage 70 is located on the upstream side of the indoor evaporator 42 along the air flow direction, and the second end of the bypass passage 70 is located on the downstream side of the indoor evaporator 42 along the air flow direction.
  • the bypass passage 70 is also provided with an air volume. Adjusting valve 71. By setting the bypass channel and the air volume regulating valve, the air flow in the air duct can be bypassed and adjusted.
  • the indoor temperature continues to rise, bypassing the air flow and guiding it back to the air duct instead of excluding some high-temperature air, which can be effective Reduce the evaporation temperature, meet the requirements of dehumidification, and bypass the airflow back to the air duct to continue using this part of the airflow for drying, which effectively improves the energy efficiency of the system.
  • the second end of the outdoor evaporator 41 communicates with the second end of the drying condenser 21
  • the second end of the indoor evaporator 42 communicates with the second end of the drying condenser 21
  • the second end of the drying condenser 21 is One end communicates with the discharge end of the compressor 1.
  • Fig. 2 is a schematic structural diagram of a heat pump drying system according to another embodiment of the present disclosure.
  • a first two-way valve 91 is provided on the first branch 201, and the first two-way valve 91 is located between the outdoor evaporator 41 and the suction end of the first compression cylinder 11.
  • a third two-way valve 93 is provided on the second branch 202. The third two-way valve 93 is located between the indoor evaporator 42 and the suction end of the second compression cylinder 12.
  • the third branch 203 is connected to the first branch 201 and the second branch 202.
  • the first end of the third branch 203 is located between the first two-way valve 91 and the suction end of the first compression cylinder 11, and the second end of the third branch 203 is located between the third two-way valve 93 and the second compression cylinder Between the suction ends of 12, a second two-way valve 92 is also provided on the third branch 203.
  • the first two-way valve is provided on the first branch where the outdoor evaporator is located, and the second two-way valve is provided on the second branch where the indoor evaporator is located, so as to control the two branches separately.
  • the third branch and the third two-way valve By setting the third branch and the third two-way valve on the third branch, the first branch or the second branch can be bypassed or short-circuited through the third branch, realizing an outdoor evaporator and an indoor evaporator One is working, the other is not working, and air is inhaled from two compression cylinders at the same time, and both of them are working, and the air is inhaled from the two compression cylinders. It realizes the switching control function of heating drying, heating dehumidification, and constant temperature dehumidification.
  • Fig. 3 is a schematic structural diagram of a heat pump drying system according to another embodiment of the present disclosure.
  • FIG. 3 The difference between FIG. 3 and FIG. 1 is that, in the embodiment shown in FIG. 3, a first three-way valve 101 is provided on the first branch 201.
  • the first end of the first three-way valve 101 is in communication with the outdoor evaporator 41, and the second end of the first three-way valve 101 is in communication with the suction end of the first compression cylinder 11.
  • a second three-way valve 102 is provided on the second branch 202.
  • the first end of the second three-way valve 102 is in communication with the indoor evaporator 42, and the second end of the second three-way valve 102 is in communication with the suction end of the second compression cylinder 12.
  • the third end of the first three-way valve 101 communicates with the third end of the second three-way valve 102.
  • the first three-way valve is provided on the first branch where the outdoor evaporator is located, and the second three-way valve is provided on the second branch where the indoor evaporator is located, so that the two branches can be separately controlled. Connecting the third ends of the two three-way valves enables the first branch or the second branch to be bypassed or short-circuited through the two three-way valves, so that one of the outdoor evaporator and the indoor evaporator can work.
  • the other is not working, sucking in from two compression cylinders at the same time, and both working and sucking in from the two compression cylinders control, realize the switching control function of heating drying, heating dehumidification, and constant temperature dehumidification.
  • Fig. 4 is a schematic structural diagram of a heat pump drying system according to another embodiment of the present disclosure.
  • the exhaust end of the compressor 1 includes a first exhaust port connected with the first compression cylinder 11 and connected with the second compression cylinder 12. Through the second exhaust port.
  • the first compression cylinder 11 is exhausted through a first exhaust port
  • the second compression cylinder 12 is exhausted through a second exhaust port.
  • the heat pump drying system further includes an outdoor condenser 22, the first end of the outdoor condenser 22 is connected with the second exhaust port, and the second end of the outdoor condenser 22 is connected with the second end of the indoor evaporator 42.
  • the first end of the drying condenser 21 communicates with the first exhaust port, and the second end of the drying condenser 21 communicates with the second end of the outdoor evaporator 41.
  • part of the high-pressure and high-temperature refrigerant compressed by the compressor can flow through the outdoor condenser to release heat, and part of the refrigerant can flow through the drying condenser to heat the drying device, or there is no refrigerant Enter the drying condenser to heat the drying device, so as to effectively realize the effect of constant temperature dehumidification or cooling and dehumidification.
  • the outdoor condenser 22 is in communication with the second compression cylinder 12 through a fourth branch 204, and a fourth two-way valve 94 is provided on the fourth branch 204.
  • the drying condenser 21 is in communication with the first compression cylinder 11 through a fifth branch 205, and a sixth two-way valve 96 is provided on the fifth branch 205.
  • the fourth branch 204 and the fifth branch 205 are connected through the sixth branch 206.
  • the first end of the sixth branch 206 is located between the fourth two-way valve 94 and the second compression cylinder 12, and the second end of the sixth branch 206 is located between the sixth two-way valve 96 and the first compression cylinder 11.
  • the sixth branch 206 is also provided with a fifth two-way valve 95.
  • the two branches can be separately controlled.
  • the fourth branch or the fifth branch can be bypassed or short-circuited through the sixth branch, so that one of the drying condenser and the outdoor condenser can work, and the other One is not working, sucking air from two compression cylinders at the same time, and both working and sucking air from the two compression cylinders control, realize the switching control function of heating drying, heating dehumidification, constant temperature dehumidification and cooling dehumidification.
  • Fig. 5 is a schematic structural diagram of a heat pump drying system according to another embodiment of the present disclosure.
  • FIG. 5 The difference between FIG. 5 and FIG. 4 is that, in the embodiment shown in FIG. 5, the outdoor condenser 22 and the second compression cylinder 12 are connected through a fourth branch 204, and a fourth branch 204 is provided with a The three-way valve 103, the first end of the third three-way valve 103 communicates with the outdoor condenser 22, and the second end of the third three-way valve 103 communicates with the exhaust port of the second compression cylinder 12.
  • the drying condenser 21 and the first compression cylinder 11 are in communication through a fifth branch 205, and a fourth three-way valve 104 is provided on the fifth branch 205.
  • the first end of the fourth three-way valve 104 is connected to the drying condenser 21 is in communication, and the second end of the fourth three-way valve 104 is in communication with the exhaust port of the first compression cylinder 11.
  • the third end of the third three-way valve 103 communicates with the third end of the fourth three-way valve 104.
  • the two branches can be controlled separately, and the two three-way The third end of the through valve is connected, so that the fourth branch or the fifth branch can be bypassed or short-circuited through the two three-way valves, so that one of the outdoor condenser and the drying condenser is working and the other is not working , Simultaneous intake of air from two compression cylinders, both of them work, and the control of air intake from the two compression cylinders realizes the switching control function of heating drying, heating dehumidification, constant temperature dehumidification and cooling and dehumidification.
  • the first compression cylinder 11 and the second compression cylinder 12 are arranged up and down, and the second compression cylinder 12 is located below the first compression cylinder 11, and the fourth branch 204 is also provided There is an oil separator 13, the bottom of the oil separator 13 is connected to the bottom of the compressor through an oil circuit 131, and an oil return control valve and an oil return capillary are provided on the oil circuit.
  • the oil return control valve and the oil return capillary are used for oil control.
  • the present disclosure also provides a control method of the heat pump drying system.
  • the drying device is controlled for dehumidification.
  • dehumidification control includes temperature-rising drying, temperature-rising dehumidification, constant-temperature dehumidification, and temperature-falling dehumidification control.
  • the present disclosure divides the evaporator into an indoor evaporator and an outdoor evaporator.
  • the indoor evaporator is arranged inside the drying device, and the outdoor evaporator is arranged in the external environment of the drying device, that is, one evaporator is installed inside and outside the drying device.
  • the temperature can meet the heating demand without adding auxiliary electric heating.
  • the heat pump drying system when the heat pump drying system includes a first two-way valve 91, a second two-way valve 92, and a third two-way valve 93:
  • the first two-way valve 91 and the second two-way valve 92 are controlled to open, and the third two-way valve 93 is controlled to close.
  • the first two-way valve 91 and the third two-way valve 93 are controlled to open, and the second two-way valve 92 is controlled to close.
  • the drying device needs to be dehumidified at a constant temperature, the second two-way valve 92 and the third two-way valve 93 are controlled to open, and the first two-way valve 91 is controlled to close.
  • the first two-way valve 91 and the second two-way valve 92 are opened, and the third two-way valve 93 is closed.
  • the compressor 1 The two suction ports are connected to the outdoor evaporator 41 at the same time. There is no refrigerant flowing through the indoor evaporator 42.
  • the system is in a fast cycle operation mode, which absorbs heat from the outdoor environment for preheating the internal materials of the drying room. Until the material temperature reaches the set value, it starts to enter the dehumidification mode.
  • the first two-way valve 91, the third two-way valve 93 are opened, and the second two-way valve 92 is closed.
  • the two suction ports of the compressor are respectively connected to the outdoor evaporator 41 and the indoor evaporator 42.
  • the indoor evaporator 42 is used for dehumidification and recovery of latent heat energy
  • the outdoor evaporator 41 is used for absorbing outdoor ambient air heat for heating up the materials inside the drying room.
  • the second two-way valve 92, the third two-way valve 93 connected to the compressor suction port are opened, and the first two-way valve 91 is closed;
  • the fifth two-way valve 95 communicating with the engine exhaust is closed, and the fourth two-way valve 94 and the sixth two-way valve 96 are opened.
  • the heat pump drying system when the heat pump drying system includes a first three-way valve 101 and a second three-way valve 102:
  • the first end of the first three-way valve 101 is controlled to communicate with the second end and the third end, and the first end of the second three-way valve 102 is controlled to be closed and the second end is controlled to be closed.
  • the end is connected with the third end.
  • the first end and the second end of the first three-way valve 101 are controlled to communicate, and the third end is closed, and the first end and the second end of the second three-way valve 102 are controlled. Connect, the third end is closed.
  • the first end of the first three-way valve 101 is controlled to close, the second end and the third end are connected, and the first end and the second end of the second three-way valve 102 are controlled. Connect with the third end.
  • the first, second and third ends of the first three-way valve 101 are all connected (the first end is the end of the three-way valve connected to the outdoor evaporator).
  • the second end is the end of the three-way valve connected to the first compression cylinder, the full text is the same)
  • the first end of the second three-way valve 102 is closed, and the second and third ends are connected (the first end is the second three-way valve
  • the end connected to the indoor evaporator and the second end are the end of the second three-way valve connected to the second compression cylinder, the full text is the same).
  • the two suction ports of the compressor 1 are simultaneously connected to the outdoor evaporator 41.
  • the first end of the first three-way valve 101 communicates with the second end, and the third end is closed.
  • the second three-way valve 102 is controlled to communicate with the first end and the second end, and the third end is closed.
  • the two suction ports are respectively connected to the outdoor evaporator 41 and the indoor evaporator 42.
  • the indoor evaporator 42 is used for dehumidification and recovery of latent heat energy
  • the outdoor evaporator 41 is used for absorbing the heat of the outdoor ambient air to dry the materials inside the room. Warm up.
  • the first end of the first three-way valve 101 is closed, the second end and the third end are connected, and the first and second ends of the second three-way valve 102 are controlled.
  • the third end and the third end are both connected;
  • the third end of the third three-way valve 103 which is in communication with the compressor exhaust at the same time, is closed, the first and second ends are connected, and the third end of the fourth three-way valve 104 is closed, the first Connect with the second end.
  • no refrigerant flows through the outdoor evaporator 41, and the indoor circulating air is cooled and dehumidified by the indoor evaporator 42, and the internal drying condenser 21 heats up.
  • the outdoor condenser 22 is placed to reduce the temperature by the heat release effect of the refrigerant. The heat is transferred to the outdoors to meet the need to maintain a constant indoor temperature.
  • the heat pump drying system when the heat pump drying system includes an outdoor condenser 22, a fourth two-way valve 94, a fifth two-way valve 95, and a sixth two-way valve 96:
  • the fifth two-way valve 95 and the sixth two-way valve 96 are controlled to open, and the fourth two-way valve 94 is controlled to close.
  • the fourth two-way valve 94 and the sixth two-way valve 96 are controlled to open, and the fifth two-way valve 95 is controlled to close.
  • the control means of the fourth two-way valve 94, the fifth two-way valve 95 and the sixth two-way valve 96 are all the same, that is, the outdoor No refrigerant flows through the condenser 22, and the system is in a fast cycle operation mode, that is, it absorbs heat from the outdoor environment for preheating the internal materials of the drying room, or the indoor evaporator 42 is used for dehumidification and recovery of latent heat energy, outdoor evaporator 41 is used to absorb heat from outdoor ambient air.
  • the second two-way valve 92, the third two-way valve 93 connected to the compressor suction port are opened, and the first two-way valve 91 is closed;
  • the fifth two-way valve 95 communicating with the engine exhaust is closed, and the fourth two-way valve 94 and the sixth two-way valve 96 are opened.
  • the outdoor condenser 22 is placed to reduce the temperature by the heat release effect of the refrigerant. The heat is transferred to the outdoors to meet the need to maintain a constant indoor temperature.
  • the cooling mode is turned on when the temperature needs to be lowered.
  • the second two-way valve 92 and the third two-way valve 93 connected to the compressor suction port are opened, and the first two-way valve 91 is closed;
  • the sixth two-way valve 96 for exhaust communication is closed, and the fourth two-way valve 94 and the fifth two-way valve 95 are opened.
  • the indoor evaporator 42 absorbs the heat of the indoor circulating air, and transfers the heat to the outdoors through the outdoor condenser 22, and the drying condenser 21 does not work and stops heating the drying device to meet the cooling demand.
  • the heat pump drying system includes an outdoor condenser 22, a third three-way valve 103, and a fourth three-way valve 104:
  • the second end of the third three-way valve 103 is controlled to communicate with the third end, the first end is closed, and the fourth three-way valve is controlled.
  • the first end, the second end and the third end of the valve 104 are all connected.
  • the first end and the second end of the third three-way valve 103 are controlled to communicate, and the third end is closed, and the first end and the second end of the fourth three-way valve 104 are controlled. Connect, the third end is closed.
  • the first end, the second end and the third end of the third three-way valve 103 are controlled to communicate, and the first end of the fourth three-way valve 104 is controlled to be closed and the second end is controlled to be closed.
  • the end is connected with the third end.
  • the second end and the third end of the third three-way valve 103 are connected, the first end is closed, and the fourth three-way valve 104 is controlled.
  • the first end, the second end and the third end are all connected, that is, no refrigerant flows through the outdoor condenser 22, and the system is in a fast cycle operation mode, that is, it absorbs heat from the outdoor environment for preheating the materials inside the drying room ,
  • the indoor evaporator 42 is used to dehumidify and recover latent heat energy
  • the outdoor evaporator 41 is used to absorb the heat of outdoor ambient air.
  • the first end and the second end of the third three-way valve 103 are connected, the third end is closed, and the first and second ends of the fourth three-way valve 104 are controlled. One end is connected and the third end is closed.
  • no refrigerant flows through the outdoor evaporator 41, and the indoor circulating air is cooled and dehumidified by the indoor evaporator 42, and the internal drying condenser 21 heats up.
  • the outdoor condenser 22 is placed to reduce the temperature by the heat release effect of the refrigerant. The heat is transferred to the outdoors to meet the need to maintain a constant indoor temperature.
  • the cooling mode is turned on when the temperature needs to be lowered.
  • the first end, the second end and the third end of the third three-way valve 103 are all connected, and the first end and the second end of the fourth three-way valve 104 are controlled to be closed.
  • the end is connected with the third end.
  • the indoor evaporator 42 absorbs the heat of the indoor circulating air, and transfers the heat to the outdoors through the outdoor condenser 22, and the drying condenser 21 does not work and stops heating the drying device to meet the cooling demand.
  • the heat pump drying system when the heat pump drying system includes a bypass channel 70 and an air volume adjustment valve 71, in the early stage of drying, the air volume adjustment valve 71 is controlled to close so that all air passes through the air duct. In the middle and late stages of drying, the air volume regulating valve 71 is controlled to open so that part of the air passes through the indoor evaporator 42 in the air duct for heat exchange, and part is bypassed through the bypass passage 70.
  • the moisture content of the dried material is large, close the air volume regulating valve 71, so that all the circulating air passes through the indoor dehumidification evaporator; in the middle and late stages of the drying of the material, the moisture content of the dried material gradually decreases.
  • the humidity of the air properly adjust the opening of the air volume control valve 71 to make part of the circulating air flow out through the bypass channel, reduce the circulating air volume through the dehumidification evaporator, and make the evaporation temperature of the indoor evaporator 42 lower than the dew point temperature of the circulating air , Meet dehumidification requirements.
  • the heat pump drying system includes a compressor 1, a drying condenser 21, a first throttling device 31 and a second throttling device 32, an outdoor evaporator 41, an indoor evaporator 42, and a first fan 8. .
  • the compressor has two mutually independent suction ports which are respectively connected to the two compression cylinders inside the compressor.
  • the refrigerant absorbs heat in the two evaporators and vaporizes the gas after being compressed by the two compression cylinders inside the compressor. It is mixed and discharged into the drying condenser 21 through the exhaust pipe.
  • the high-temperature and high-pressure refrigerant gas releases heat in the internal air duct of the drying room and becomes high-pressure supercooled liquid.
  • the supercooled liquid refrigerant is throttled by two throttling devices. After depressurization, it enters the evaporator to evaporate and absorb heat.
  • the drying device includes a drying room 6, an air volume regulating valve 71, a second fan 5, an air duct 110, and the like.
  • a bypass channel 70 is provided, and the ratio of the bypass air volume to the air volume passing through the dehumidifying evaporator is controlled by the adjustment function of the air volume regulating valve 71.
  • the circulating air in the drying room is cooled and dehumidified by the indoor evaporator 42 under the action of the circulating fan, and the condensed water is discharged to the outside of the drying room through the drainage device arranged under the dehumidifying evaporator.
  • the dehumidified air passes through the air duct and exchanges heat with the system condenser, it changes into a high temperature and low humidity state and then enters the drying room to exchange heat with the dried material.
  • the outdoor evaporator exchanges heat with the outdoor ambient air, and transfers the heat of the outdoor air through the condenser to the circulating air inside the drying room to increase the drying temperature in the drying room.
  • the speed of the first fan 8 By controlling the speed of the first fan 8 to control the heating rate inside the drying room, during the start-up heating phase, by appropriately increasing the operating frequency of the compressor 1 and the speed of the first fan 8 to increase the heat exchange of the outdoor evaporator; After the air temperature in the room reaches a certain set value, it enters the dehumidification stage, and the rotation speed of the first fan 8 can be appropriately reduced, and the heat exchange amount of the outer evaporator can be appropriately reduced.
  • the air volume regulating valve 71 controls the circulating air flow through the dehumidification evaporator: in the initial stage of drying, the water content of the dried material is large, and the air volume regulating valve is closed to make all the circulating air pass through the indoor dehumidification evaporator; The water content gradually decreases.
  • the opening of the air volume regulating valve 71 should be adjusted appropriately according to the humidity content of the air before the dehumidification evaporator, so that part of the circulating air flows out through the bypass channel, reducing the circulating air volume through the dehumidifying evaporator, and making the room
  • the evaporation temperature of the evaporator 42 is lower than the dew point temperature of the circulating air, which meets the dehumidification requirements.
  • the two suction ports of the compressor 1 are respectively connected to the outdoor evaporator 41 and the indoor evaporator 42 through the first two-way valve 91, the second two-way valve 92, and the third two-way valve 93.
  • the exhaust port near the oil sump of the compressor is connected by an oil separator 13.
  • the exhaust is separated from the lubricant and refrigerant in the oil separator and then discharged to the condenser.
  • the separated lubricant passes through the oil return control valve. Return to the compressor oil sump after returning to the oil capillary.
  • the high-pressure refrigerant exhaust discharged from the oil separator and the exhaust of another compression cylinder pass through the fourth two-way valve 94, the fifth two-way valve 95, the sixth two-way valve 96, the drying condenser 21, and the outdoor condenser One or two of 22 are connected.
  • the high-temperature refrigerant gas is condensed into refrigerant liquid in the condenser, it is throttled by the first throttling device 31 and the second throttling device 32, and then enters the outdoor evaporator 41 and the indoor evaporator 42.
  • the low-temperature and low-pressure refrigerant After the evaporator absorbs the heat in the surrounding air and becomes saturated or superheated refrigerant gas, it enters the compressor suction port through the first two-way valve 91, the second two-way valve 92, and the third two-way valve 93. The entire refrigerant cycle process.
  • the circulation flow of the drying medium air is shown by the dotted line in FIG. 4.
  • the high temperature and high humidity air from the drying room 6 is adjusted by the air volume adjustment valve 71 to control the ratio of the air volume through the indoor evaporator 42 and the bypass air volume.
  • the air volume passing through the evaporator exchanges heat with the refrigerant in the evaporator and then is cooled and dehumidified.
  • the low-temperature and low-humidity air after cooling and dehumidification is mixed with the bypass air and heated by the drying condenser 21 of the heat pump system to become hot air with high temperature and low moisture content.
  • the high-temperature air is sent into the drying room through the suction effect of the second fan 5 connected in the air duct, and exchanges heat and moisture with the material to be dried in the drying room, thereby heating the material to be dried and taking away the volatilized moisture of the material , To reduce the drying effect on the dried material.
  • the second two-way valve 92 and the third two-way valve 93 connected to the suction port of the compressor are opened, and the first two-way valve 91 is closed at the same time;
  • the fifth two-way valve 95 communicating with the compressor exhaust is closed, and the fourth two-way valve 94 and the sixth two-way valve 96 are opened.
  • this mode there is no refrigerant flowing in the outdoor evaporator 41, and the indoor circulating air is cooled and dehumidified by the indoor evaporator 42, and the internal drying condenser 21 is heated and heated, and placed in the outdoor condenser 22 through the heat release of the refrigerant in it. Transfer heat to the outdoors to meet the need to maintain a constant indoor temperature.
  • the cooling mode is turned on when the temperature needs to be lowered.
  • the second two-way valve 92 and the third two-way valve 93 connected to the compressor suction port are opened, and the first two-way valve 91 is closed;
  • the sixth two-way valve 96 for exhaust communication is closed, and the fourth two-way valve 94 and the fifth two-way valve 95 are opened.
  • the indoor evaporator 42 absorbs the heat of the indoor circulating air, and transfers the heat to the outdoors through the outdoor condenser 22 to meet the cooling demand.
  • a connecting pipe and three two-way valves (first two-way valve 91, second two-way valve 92, and third two-way valve 93) are added between the two suction pipes of the compressor.
  • the opening and closing combination of three two-way valves realizes the conversion of the operation mode of the heat pump drying system.
  • the first two-way valve 91, the second two-way valve 92 are opened, and the third two-way valve 93 is closed.
  • the two suction ports of the compressor 1 are simultaneously connected to the outdoor evaporator 41 , No refrigerant flows through the indoor evaporator 42.
  • the system is in a fast cycle operation mode, that is, it absorbs heat from the outdoor environment and uses it to preheat the materials in the drying room until the material temperature reaches the set value. It starts to enter the dehumidification mode.
  • the first two-way valve 91, the third two-way valve 93 are opened, and the second two-way valve 92 is closed.
  • the two suction ports of the compressor are respectively connected to the outdoor evaporator 41 and the indoor evaporator 42.
  • the indoor evaporator 42 is used for dehumidification and recovery of latent heat energy
  • the outdoor evaporator 41 is used for absorbing outdoor ambient air heat for heating up the materials inside the drying room.
  • the second two-way valve 92 and the third two-way valve 93 are opened, and the first two-way valve 91 is closed.
  • the two suction ports of the compressor are simultaneously connected to the indoor evaporator 42.

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  • Drying Of Solid Materials (AREA)

Abstract

一种热泵干燥系统和控制方法，该热泵干燥系统包括压缩机(1)、烘干装置(100)、干燥冷凝器(21)、室外蒸发器(41)和室内蒸发器(42)，干燥冷凝器(21)与压缩机(1)的排气端连通，以便对烘干装置(100)内的空气进行加热，室外蒸发器(41)与压缩机(1)的吸气端连通，以便对烘干装置(100)外部进行吸热，室内蒸发器(42)与压缩机(1)的吸气端连通，以便对烘干装置(100)内的空气进行除湿。该热泵干燥控制方法使用上述热泵干燥系统对烘干装置（100）进行除湿控制。

Description

热泵干燥系统和控制方法
相关申请的交叉引用
本申请是以CN申请号为201910187839.3，申请日为2019年3月13日的申请为基础，并主张其优先权，该CN申请的公开内容在此作为整体引入本申请中。
技术领域
本公开属于热泵技术领域，具体涉及一种热泵干燥系统和控制方法。
背景技术
现有热泵干燥装置主要采用开式系统。开式系统的基本原理是：在室外蒸发器吸热后，通过室内冷凝器将热量传递到干燥室内，以便对干燥温度要求较高的物料进行干燥处理。
发明内容
根据本公开实施例的第一方面，提供一种热泵干燥系统，包括：压缩机、烘干装置、干燥冷凝器、室外蒸发器和室内蒸发器，所述干燥冷凝器与所述压缩机的排气端连通，以便对所述烘干装置内的空气进行加热，所述室外蒸发器与所述压缩机的吸气端连通，以便对所述烘干装置外部进行吸热，所述室内蒸发器与所述压缩机的吸气端连通，以便对所述烘干装置内的空气进行除湿。
在一些实施例中，所述压缩机包括第一压缩缸和第二压缩缸，所述室外蒸发器所在的第一支路的第一端与所述第一压缩缸的吸气端连通，所述室内蒸发器所在的第二支路的第一端与所述第二压缩缸的吸气端连通。
在一些实施例中，所述第一压缩缸和所述第二压缩缸的排气混合后、通过所述压缩机的排气端排出压缩机。
在一些实施例中，在所述第一支路上设有第一节流装置，所述第一节流装置沿制冷剂流动方向位于所述室外蒸发器的上游侧；在所述第二支路上设有第二节流装置，所述第二节流装置沿制冷剂流动方向位于所述室内蒸发器的上游侧；所述热泵干燥系统还包括对所述室外蒸发器散热的第一风机。
在一些实施例中，所述烘干装置包括干燥房，所述干燥房内设置有需烘干的物料； 所述烘干装置还包括风道，所述风道与所述干燥房连通，所述风道在所述室内蒸发器中使得风道内的空气与制冷剂进行换热，所述风道在所述干燥冷凝器中使得风道内的空气与制冷剂进行换热。
在一些实施例中，所述烘干装置还包括与所述风道连通设置的第二风机；所述干燥冷凝器沿风道中空气流动方向位于所述室内蒸发器的下游侧。
在一些实施例中，还包括：与所述风道连通的旁通通道，所述旁通通道的第一端沿空气流动方向位于所述室内蒸发器的上游侧，所述旁通通道的第二端沿空气流动方向位于所述室内蒸发器下游侧，所述旁通通道中还设置有风量调节阀。
在一些实施例中，还包括：设置在所述第一支路上的第一二通阀，所述第一二通阀位于所述室外蒸发器和所述第一压缩缸的吸气端之间；设置在所述第二支路上的第三二通阀，所述第三二通阀位于所述室内蒸发器和所述第二压缩缸的吸气端之间；与所述第一支路和所述第二支路连通的第三支路，所述第三支路的第一端位于所述第一二通阀与所述第一压缩缸的吸气端之间，所述第三支路的第二端位于所述第三二通阀与所述第二压缩缸的吸气端之间，在所述第三支路上还设置有第二二通阀。
在一些实施例中，还包括：设置在所述第一支路上的第一三通阀，所述第一三通阀的第一端与所述室外蒸发器连通，所述第一三通阀的第二端与所述第一压缩缸的吸气端连通；设置在所述第二支路上的第二三通阀，，所述第二三通阀的第一端与所述室内蒸发器连通，所述第二三通阀的第二端与所述第二压缩缸的吸气端连通；所述第一三通阀的第三端与所述第二三通阀的第三端连通。
在一些实施例中，所述室外蒸发器的第二端与所述干燥冷凝器的第二端连通，所述室内蒸发器的第二端与所述干燥冷凝器的第二端连通，所述干燥冷凝器的第一端与与所述压缩机的排气端连通。
在一些实施例中，所述排气端包括与所述第一压缩缸相连通的第一排气口和与所述第二压缩缸相连通的第二排气口；所述热泵干燥系统还包括室外冷凝器，所述室外冷凝器的第一端与所述第二排气口连通，所述室外冷凝器的第二端与所述室内蒸发器的第二端连通；所述干燥冷凝器的第一端与所述第一排气口连通，所述干燥冷凝器的第一端与所述室外蒸发器的第二端连通。
在一些实施例中，还包括：与所述室外冷凝器与所述第二压缩缸连通的第四支路，在所述第四支路上设置有第四二通阀；与所述干燥冷凝器与所述第一压缩缸连通的第五支路，在所述第五支路上设置有第六二通阀；与所述第四支路和所述第五支路连通 的第六支路，所述第六支路的第一端位于所述第四二通阀和所述第二压缩缸的排气口之间，所述第六支路的第二端位于所述第六二通阀和所述第一压缩缸的排气口之间，所述第六支路上还设置有第五二通阀。
在一些实施例中，还包括：与所述室外冷凝器和所述第二压缩缸连通的第四支路，所述第四支路上设置有第三三通阀，所述第三三通阀的第一端与所述室外冷凝器连通，所述第三三通阀的第二端与所述第二压缩缸的排气口连通；与所述干燥冷凝器和所述第一压缩缸连通的第五支路，所述第五支路上设置有第四三通阀，所述第四三通阀的第一端与所述干燥冷凝器连通、所述第四三通阀的第二端与所述第一压缩缸的排气口连通；所述第三三通阀的第三端与所述第四三通阀的第三端连通。
在一些实施例中，所述第一压缩缸和所述第二压缩缸上下布置，所述第二压缩缸位于所述第一压缩缸的下方，并且所述第四支路上还设置有油分离器，所述油分离器的底部通过油回路与压缩机的底部连通，所述油回路上设置有回油控制阀和回油毛细管。
根据本公开实施例第二方面，提供一种热泵干燥系统的控制方法，使用前任一项所述的热泵干燥系统，对烘干装置进行除湿控制。
在一些实施例中，在所述热泵干燥系统包括第一二通阀、第二二通阀和第三二通阀的情况下：在需要对烘干装置进行升温干燥的情况下，控制所述第一二通阀和所述第二二通阀打开，控制所述第三二通阀关闭；在需要对烘干装置进行升温除湿的情况下，控制所述第一二通阀和所述第三二通阀打开，控制所述第二二通阀关闭；在需要对烘干装置进行恒温除湿的情况下，控制所述第二二通阀和所述第三二通阀打开，控制所述第一二通阀关闭。
在一些实施例中，在所述热泵干燥系统包括第一三通阀和第二三通阀的情况下：在需要对烘干装置进行升温干燥的情况下，控制所述第一三通阀的第一端和第二端、第三端均连通，控制所述第二三通阀的第一端关闭、第二端和第三端连通；在需要对烘干装置进行升温除湿的情况下，控制所述第一三通阀的第一端和第二端连通、第三端关闭，控制所述第二三通阀的第一端和第二端连通、第三端关闭；在需要对烘干装置进行恒温除湿的情况下，控制所述第一三通阀的第一端关闭、第二端和第三端连通，控制所述第二三通阀的第一端、第二端和第三端均连通。
在一些实施例中，在所述热泵干燥系统包括室外冷凝器、第四二通阀、第五二通阀、第六二通阀的情况下：在需要对烘干装置进行升温干燥或在需要对烘干装置进行 升温除湿的情况下，控制所述第五二通阀和所述第六二通阀打开、控制所述第四二通阀关闭；在需要对烘干装置进行恒温除湿的情况下，控制所述第四二通阀和所述第六二通阀打开、控制所述第五二通阀闭；在需要对烘干装置进行降温除湿的情况下，控制所述第二二通阀和所述第三二通阀打开、控制所述第一二通阀关闭，且控制所述第四二通阀和所述第五二通阀打开、控制所述第六二通阀关闭。
在一些实施例中，在所述热泵干燥系统包括包括室外冷凝器、第三三通阀和第四三通阀的情况下：在需要对烘干装置进行升温干燥或在需要对烘干装置进行升温除湿的情况下，控制所述第三三通阀的第二端和第三端连通、第一端关闭，控制所述第四三通阀的第一端、第二端和第三端均连通；在需要对烘干装置进行恒温除湿的情况下，控制所述第三三通阀的第一端和第二端连通、第三端关闭，控制所述第四三通阀的第一端和第二端连通、第三端关闭；在需要对烘干装置进行降温除湿的情况下，控制所述第三三通阀的第一端、第二端和第三端均连通，控制所述第四三通阀的第一端关闭、第二端和第三端连通。
在一些实施例中，在所述热泵干燥系统包括旁通通道和风量调节阀的情况下，在干燥初期控制关闭所述风量调节阀，使得空气全部经过风道中的室内蒸发器中进行换热；在干燥中后期控制打开所述风量调节阀，使得空气中的一部分经过风道中的室内蒸发器中进行换热、空气中的另一部分经由所述旁通通道被旁通。
附图说明
图1是本公开一个实施例的热泵干燥系统的结构示意图；
图2是本公开另一个实施例的热泵干燥系统的结构示意图；
图3是本公开又一个实施例的热泵干燥系统的结构示意图；
图4是本公开又一个实施例的热泵干燥系统的结构示意图；
图5是本公开又一个实施例的热泵干燥系统的结构示意图。
具体实施方式
下面将结合本公开实施例中的附图，对本公开实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本公开一部分实施例，而不是全部的实施例。以下对至少一个示例性实施例的描述实际上仅仅是说明性的，决不作为对本公开及其应用或使用的任何限制。基于本公开中的实施例，本领域普通技术人员在没有作出创 造性劳动前提下所获得的所有其他实施例，都属于本公开保护的范围。
除非另外具体说明，否则在这些实施例中阐述的部件和步骤的相对布置、数字表达式和数值不限制本公开的范围。
同时，应当明白，为了便于描述，附图中所示出的各个部分的尺寸并不是按照实际的比例关系绘制的。
对于相关领域普通技术人员已知的技术、方法和设备可能不作详细讨论，但在适当情况下，所述技术、方法和设备应当被视为授权说明书的一部分。
在这里示出和讨论的所有示例中，任何具体值应被解释为仅仅是示例性的，而不是作为限制。因此，示例性实施例的其它示例可以具有不同的值。
应注意到：相似的标号和字母在下面的附图中表示类似项，因此，一旦某一项在一个附图中被定义，则在随后的附图中不需要对其进行进一步讨论。
发明人经过研究发现，在上述开式系统中，在干燥的过程中需要向外界排出高温湿空气以排湿，造成热量浪费和周围环境污染。
为此，本公开提供一种能够在干燥过程中无需向外界排出高温湿空气的方案。
图1是本公开一个实施例的热泵干燥系统的结构示意图。
如图1所示，热泵干燥系统包括：压缩机1、烘干装置100、干燥冷凝器21、室外蒸发器41和室内蒸发器42，干燥冷凝器21与压缩机1的排气端连通，以便对烘干装置100内的空气进行加热，室外蒸发器41与压缩机1的吸气端连通，以便对烘干装置100外部进行吸热，室内蒸发器42与压缩机1的吸气端连通，以便对烘干装置100内的空气进行除湿。
本公开通过将蒸发器分为室内蒸发器和室外蒸发器，室内蒸发器设置在烘干装置内部，室外蒸发器设置在烘干装置外部环境中，即在烘干装置内、外分别设置一个蒸发器，既能保证系统既能回收室内排湿的潜热，又能满足干燥物料升温的工艺需求，实现烘干装置内的升温和除湿需求，可以有效避免热量浪费和周围环境污染的同时还能控制干燥温度，不需增设辅助电加热便能满足升温需求。
在一些实施例中，如图1所示，压缩机1包括第一压缩缸11和第二压缩缸12，室外蒸发器41所在的第一支路201的第一端与第一压缩缸11的吸气端连通，室内蒸发器42所在的第二支路202的第一端与第二压缩缸12的吸气端连通。通过将压缩机设置为包括两个压缩缸的结构形式，能够使得两个压缩缸之间的吸气压力不一定相等，室内蒸发器和室外蒸发器分别与压缩机的两个独立压缩缸吸气口连接，形成两个 蒸发温度，分别对应不同的吸气压力，能够有效保证系统运行能效；并且将压缩机的缸体设置在同一个壳体内部(即采用双吸单排或双吸双排形式的压缩机)，有效避免压缩机并联时存在的回油不均匀的问题。
在一些实施例中，如图1所示，压缩机1包括一个共用排气口，第一压缩缸11和第二压缩缸12的排气混合后、通过共用排气口排出压缩机。。
在一些实施例中，如图1所示，在第一支路201上设有第一节流装置31，第一节流装置31沿制冷剂流动方向位于室外蒸发器41的上游侧；在第二支路202上设有第二节流装置32，第二节流装置32沿制冷剂流动方向位于室内蒸发器42的上游侧。在一些实施例中，热泵干燥系统还包括对室外蒸发器41散热的第一风机8。
通过第一节流装置的设置能够对流经室外蒸发器之前的制冷剂进行节流降压处理，以便制冷剂进入室外蒸发器后能够实现吸热，通过第二节流装置的设置能够对流经室内蒸发器之前的制冷剂进行节流降压处理，以便制冷剂进入室内蒸发器后能够实现吸热，通过第一风机能够控制室外蒸发器的换热效果和换热程度。
在一些实施例中，如图1所示，烘干装置100包括干燥房6，干燥房6内设置有需烘干的物料；烘干装置100还包括风道110，风道110与干燥房6连通，风道110在室内蒸发器42中使得风道内的空气与制冷剂进行换热。在一些实施例中，风道110贯穿室内蒸发器42。风道110在干燥冷凝器21中使得风道内的空气与制冷剂进行换热。在一些实施例中，风道110贯穿干燥冷凝器21。
通过干燥房能够放置需烘干的物料，风道中的空气被烘干加热后进入干燥房中以对物料进行烘干和加热，风道在室内蒸发器中与制冷剂进行换热能够使得空气能够在该处被除湿、风道在干燥冷凝器中与制冷剂进行换热能够使得空气能够在该处被加热。
在一些实施例中，烘干装置100还包括与风道110连通设置的第二风机5。在一些实施例中，干燥冷凝器21沿风道110中空气流动方向位于室内蒸发器42的下游侧。
通过第二风机(例如，循环风机)的设置能够提供循环的空气流，促使气流流经干燥房以及风道，干燥冷凝器位于室内蒸发器的下游能够，使得空气先在室内蒸发器中被吸热后(即除湿)再进入干燥冷凝器中加热干燥，完成除湿和干燥的功能和作用。
在一些实施例中，如图1所示，风道110与旁通通道70连通。旁通通道70的第一端沿空气流动方向位于室内蒸发器42的上游侧，旁通通道70的第二端沿空气流动方向位于室内蒸发器42下游侧，旁通通道70中还设置有风量调节阀71。通过设置旁 通通道和风量调节阀能够对风道中的气流进行旁通调节，在干燥后期，室内温度持续上升，将气流旁通而导回至风道中、而不是排除部分高温气体，这样能够有效降低蒸发温度，满足除湿的要求，并且将气流旁通回至风道中继续利用这部分气流进行干燥、有效地提高了系统能效。
在一些实施例中，室外蒸发器41的第二端与干燥冷凝器21的第二端连通，室内蒸发器42的第二端与干燥冷凝器21的第二端连通，干燥冷凝器21的第一端与压缩机1的排气端连通。
图2是本公开另一个实施例的热泵干燥系统的结构示意图。
图2与图1的不同之处在于，在图2所示实施例中，
第一支路201上设有第一二通阀91，第一二通阀91位于室外蒸发器41和第一压缩缸11的吸气端之间。第二支路202上设有第三二通阀93，第三二通阀93位于室内蒸发器42和第二压缩缸12的吸气端之间。第三支路203与第一支路201和第二支路202连通。第三支路203的第一端位于第一二通阀91与第一压缩缸11的吸气端之间，第三支路203的第二端位于第三二通阀93与第二压缩缸12的吸气端之间，在第三支路203上还设置有第二二通阀92。
通过在室外蒸发器所在的第一支路上设置第一二通阀，在室内蒸发器所在的第二支路上设置第二二通阀，以便对该两支路分别进行控制。通过设置第三支路以及在第三支路上设置第三二通阀，能够使得第一支路或第二支路通过该第三支路被旁通或短路，实现室外蒸发器和室内蒸发器中有一个工作、另一个不工作、同时从两个压缩缸中吸气，两个都工作、从两个压缩缸中吸气的控制，实现升温干燥、升温除湿、恒温除湿的切换控制作用。
图3是本公开又一个实施例的热泵干燥系统的结构示意图。
图3与图1的不同之处在于，在图3所示实施例中，在第一支路201上设置有第一三通阀101。第一三通阀101的第一端与室外蒸发器41连通，第一三通阀101的第二端与第一压缩缸11的吸气端连通。第二支路202上设置有第二三通阀102。第二三通阀102的第一端与室内蒸发器42连通，第二三通阀102的第二端与第二压缩缸12的吸气端连通。第一三通阀101的第三端与第二三通阀102的第三端连通。
通过在室外蒸发器所在的第一支路上设置第一三通阀，在室内蒸发器所在的第二支路上设置第二三通阀，以便能够对该两支路分别进行控制。将两个三通阀的第三端进行连通，能够使得第一支路或第二支路通过该两个三通阀被旁通或短路，实现室外 蒸发器和室内蒸发器中有一个工作、另一个不工作、同时从两个压缩缸中吸气，两个都工作、从两个压缩缸中吸气的控制，实现升温干燥、升温除湿、恒温除湿的切换控制作用。
图4是本公开又一个实施例的热泵干燥系统的结构示意图。
图4与图2的不同之处在于，在图4所示实施例中，压缩机1的排气端包括与第一压缩缸11相连通的第一排气口和与第二压缩缸12相连通的第二排气口。第一压缩缸11通过第一排气口排气，第二压缩缸12通过第二排气口排气。
热泵干燥系统还包括室外冷凝器22，室外冷凝器22的第一端第二排气口连通，室外冷凝器22的第二端与室内蒸发器42的第二端连通。干燥冷凝器21的第一端与第一排气口连通，干燥冷凝器21的第二端与室外蒸发器41的第二端连通。通过设置室外冷凝器能够使得部分被压缩机压缩后的高压高温制冷剂流经室外冷凝器进行放热，还使得部分制冷剂流经干燥冷凝器，以便对烘干装置进行加热，或没有制冷剂进入干燥冷凝器中对烘干装置进行加热，从而能够有效实现恒温除湿的作用或降温除湿的作用。
在一些实施例中，如图4所示，室外冷凝器22与第二压缩缸12之间通过第四支路204连通，在第四支路204上设置有第四二通阀94。干燥冷凝器21与第一压缩缸11之间通过第五支路205连通，在第五支路205上设置有第六二通阀96。
第四支路204和第五支路205通过第六支路206连通。第六支路206的第一端位于第四二通阀94和第二压缩缸12之间，第六支路206的第二端位于第六二通阀96和第一压缩缸11之间。第六支路206上还设置有第五二通阀95。
通过在室外冷凝器所在的第四支路上设置的第四二通阀，在干燥冷凝器所在的第五支路上设置的第六二通阀，以便对该两支路分别进行控制。通过设置第六支路和第五二通阀，能够使得第四支路或第五支路通过该第六支路被旁通或短路，实现干燥冷凝器和室外冷凝器中有一个工作、另一个不工作、同时从两个压缩缸中吸气，两个都工作、从两个压缩缸中吸气的控制，实现升温干燥、升温除湿、恒温除湿以及降温除湿的切换控制作用。
图5是本公开又一个实施例的热泵干燥系统的结构示意图。
图5与图4的不同之处在于，在图5所示实施例中，室外冷凝器22与第二压缩缸12之间通过第四支路204连通，在第四支路204上设置有第三三通阀103，第三三通阀103的第一端与室外冷凝器22连通、第三三通阀103的第二端与第二压缩缸12 的排气口连通。
干燥冷凝器21与第一压缩缸11之间通过第五支路205连通，在第五支路205上设置有第四三通阀104，第四三通阀104的第一端与干燥冷凝器21连通、第四三通阀104的第二端与第一压缩缸11的排气口连通。
第三三通阀103的第三端与第四三通阀104的第三端连通。
通过在室外冷凝器所在的第四支路上设置第三三通阀，在干燥冷凝器所在的第五支路上设置第四三通阀，能够对该两支路进行分别控制，并且将两个三通阀的第三端进行连通，能够使得第四支路或第五支路通过该两个三通阀被旁通或短路，实现室外冷凝器和干燥冷凝器中有一个工作、另一个不工作、同时从两个压缩缸中吸气，两个都工作、从两个压缩缸中吸气的控制，实现升温干燥、升温除湿、恒温除湿以及降温除湿的切换控制作用。
在一些实施例中，如图5所示，第一压缩缸11和第二压缩缸12上下布置，且第二压缩缸12位于第一压缩缸11的下方，并且第四支路204上还设置有油分离器13，油分离器13的底部通过油回路131连通至压缩机的底部，且油回路上设置有回油控制阀和回油毛细管。
通过将油分离器连接到位于下方的第二压缩缸的第四支路上，能够实现良好的回油，通过回油控制阀和回油毛细管用于控油作用。
本公开还提供一种热泵干燥系统的控制方法。通过使用上述任一实施例所述的热泵干燥系统，对烘干装置进行除湿控制。例如，除湿控制包括升温干燥、升温除湿、恒温除湿以及降温除湿控制。本公开通过将蒸发器分为室内蒸发器和室外蒸发器，室内蒸发器设置在烘干装置内部，室外蒸发器设置在烘干装置外部环境中，即在烘干装置内、外分别设置一个蒸发器，既能保证系统既能回收室内排湿的潜热，又能满足干燥物料升温的工艺需求，实现干燥房内的升温和除湿需求，可以有效避免热量浪费和周围环境污染的同时还能控制干燥温度、不需增设辅助电加热便能满足升温需求。
在一些实施例中，如图2或图4所示，在热泵干燥系统包括第一二通阀91、第二二通阀92和第三二通阀93的情况下：
在需要对烘干装置进行升温干燥的情况下，控制第一二通阀91和第二二通阀92打开、控制第三二通阀93关闭。
在需要对烘干装置进行升温除湿的情况下，控制第一二通阀91和第三二通阀93打开、控制第二二通阀92关闭。
在需要对烘干装置进行恒温除湿的情况下，控制第二二通阀92和第三二通阀93打开、控制第一二通阀91关闭。
例如，在干燥启动阶段的升温运行模式(即升温干燥)下，第一二通阀91、第二二通阀92(优选电磁阀)开启、第三二通阀93关闭，此时压缩机1的两个吸气口同时与室外蒸发器41相连接，室内蒸发器42中无制冷剂流过，系统为快速循环运行模式，即从室外环境中吸收热量用于干燥房内部物料的预热，直至物料温度达到设定值是开始进入除湿模式。
在除湿升温阶段，第一二通阀91、第三二通阀93打开、第二二通阀92关闭，压缩机的两个吸气口分别与室外蒸发器41和室内蒸发器42相连接，室内蒸发器42用于除湿并回收潜热能量、室外蒸发器41用于吸收室外环境空气热量用于干燥房内部物料的升温。
当温度升高到设定值时，进入恒温除湿模式：与压缩机吸气口相连接的第二二通阀92、第三二通阀93打开、第一二通阀91关闭；同时与压缩机排气连通的第五二通阀95关闭，第四二通阀94、第六二通阀96打开。在该模式下，室外蒸发器41内无制冷剂流过，室内循环空气在室内蒸发器42降温除湿后内干燥冷凝器21加热升温，同时放置室外冷凝器22通过制冷剂在其中的放热作用将热量传递至室外，满足维持室内温度恒定的需求。
在一些实施例中，如图3或图5所示，在热泵干燥系统包括第一三通阀101和第二三通阀102的情况下：
在需要对烘干装置进行升温干燥的情况下，控制第一三通阀101的第一端和第二端、第三端均连通，控制第二三通阀102的第一端关闭、第二端和第三端连通。
在需要对烘干装置进行升温除湿的情况下，控制第一三通阀101的第一端和第二端连通、第三端关闭，控制第二三通阀102的第一端和第二端连通、第三端关闭。
在需要对烘干装置进行恒温除湿的情况下，控制第一三通阀101的第一端关闭、第二端和第三端连通，控制第二三通阀102的第一端、第二端和第三端均连通。
例如，在干燥启动阶段的升温运行模式(即升温干燥)下，第一三通阀101的第一、第二和第三端均连通(第一端即三通阀与室外蒸发器相连的一端、第二端即三通阀与第一压缩缸相连的一端，全文同)，第二三通阀102的第一端关闭、第二和第三端连通(第一端即第二三通阀与室内蒸发器相连的一端、第二端即第二三通阀与第二压缩缸相连的一端，全文同)，此时压缩机1的两个吸气口同时与室外蒸发器41相 连接，室内蒸发器42中无制冷剂流过，系统为快速循环运行模式，即从室外环境中吸收热量用于干燥房内部物料的预热，直至物料温度达到设定值是开始进入除湿模式。
在除湿升温阶段，第一三通阀101的第一端和第二端连通、第三端关闭，控制第二三通阀102的第一端和第二端连通、第三端关闭，压缩机的两个吸气口分别与室外蒸发器41和室内蒸发器42相连接，室内蒸发器42用于除湿并回收潜热能量、室外蒸发器41用于吸收室外环境空气热量用于干燥房内部物料的升温。
当温度升高到设定值时，进入恒温除湿模式：第一三通阀101的第一端关闭、第二端和第三端连通，控制第二三通阀102的第一端、第二端和第三端均连通；同时与压缩机排气连通的第三三通阀103的第三端关闭、第一和第二端连通，第四三通阀104的第三端关闭、第一和第二端连通。该模式下，室外蒸发器41内无制冷剂流过，室内循环空气在室内蒸发器42降温除湿后内干燥冷凝器21加热升温，同时放置室外冷凝器22通过制冷剂在其中的放热作用将热量传递至室外，满足维持室内温度恒定的需求。
在一些实施例中，如图4所示，在热泵干燥系统包括室外冷凝器22、第四二通阀94、第五二通阀95、第六二通阀96的情况下：
在需要对烘干装置进行升温干燥或在需要对烘干装置进行升温除湿的情况下，控制第五二通阀95和第六二通阀96打开、控制第四二通阀94关闭。
在需要对烘干装置进行恒温除湿的情况下，控制第四二通阀94和第六二通阀96打开、控制第五二通阀95关闭。
在需要对烘干装置进行降温除湿的情况下，控制第二二通阀92和第三二通阀93打开、控制第一二通阀91关闭，且控制第四二通阀94和第五二通阀95打开、控制第六二通阀96关闭。
例如，在干燥启动阶段的升温运行模式(即升温干燥)和除湿升温阶段下，第四二通阀94、第五二通阀95和第六二通阀96的控制手段均相同、即使得室外冷凝器22中无制冷剂流过，系统为快速循环运行模式、即从室外环境中吸收热量用于干燥房内部物料的预热，或者室内蒸发器42用于除湿并回收潜热能量、室外蒸发器41用于吸收室外环境空气热量。
当温度升高到设定值时，进入恒温除湿模式：与压缩机吸气口相连接的第二二通阀92、第三二通阀93打开、第一二通阀91关闭；同时与压缩机排气连通的第五二通 阀95关闭，第四二通阀94、第六二通阀96打开。该模式下，室外蒸发器41内无制冷剂流过，室内循环空气在室内蒸发器42降温除湿后内干燥冷凝器21加热升温，同时放置室外冷凝器22通过制冷剂在其中的放热作用将热量传递至室外，满足维持室内温度恒定的需求。
在干燥完成，需要降温时开启降温模式，此时：与压缩机吸气口相连接的第二二通阀92、第三二通阀93打开、第一二通阀91关闭；同时与压缩机排气连通的第六二通阀96关闭，第四二通阀94、第五二通阀95打开。此时，室内蒸发器42吸收室内循环空气的热量，通过室外冷凝器22将热量转移至室外，干燥冷凝器21不工作、停止对烘干装置升温，满足降温需求。
在一些实施例中，如图5所示，在热泵干燥系统包括室外冷凝器22、第三三通阀103和第四三通阀104的情况下：
在需要对烘干装置进行升温干燥或在需要对烘干装置进行升温除湿的情况下，控制第三三通阀103的第二端和第三端连通、第一端关闭，控制第四三通阀104的第一端、第二端和第三端均连通。
在需要对烘干装置进行恒温除湿的情况下，控制第三三通阀103的第一端和第二端连通、第三端关闭，控制第四三通阀104的第一端和第二端连通、第三端关闭。
在需要对烘干装置进行降温除湿的情况下，控制第三三通阀103的第一端、第二端和第三端均连通，控制第四三通阀104的第一端关闭、第二端和第三端连通。
例如，在干燥启动阶段的升温运行模式(即升温干燥)和除湿升温阶段下，第三三通阀103的第二端和第三端连通、第一端关闭，控制第四三通阀104的第一端、第二端和第三端均连通、即使得室外冷凝器22中无制冷剂流过，系统为快速循环运行模式、即从室外环境中吸收热量用于干燥房内部物料的预热，或者室内蒸发器42用于除湿并回收潜热能量、室外蒸发器41用于吸收室外环境空气热量。
当温度升高到设定值时，进入恒温除湿模式：第三三通阀103的第一端和第二端连通、第三端关闭，控制第四三通阀104的第一端和第二端连通、第三端关闭。该模式下，室外蒸发器41内无制冷剂流过，室内循环空气在室内蒸发器42降温除湿后内干燥冷凝器21加热升温，同时放置室外冷凝器22通过制冷剂在其中的放热作用将热量传递至室外，满足维持室内温度恒定的需求。
在干燥完成，需要降温时开启降温模式，此时：第三三通阀103的第一端、第二端和第三端均连通，控制第四三通阀104的第一端关闭、第二端和第三端连通。此时， 室内蒸发器42吸收室内循环空气的热量，通过室外冷凝器22将热量转移至室外，干燥冷凝器21不工作、停止对烘干装置升温，满足降温需求。
在一些实施例中，如图1至图5所示，在热泵干燥系统包括旁通通道70和风量调节阀71的情况下，在干燥初期，控制关闭风量调节阀71，使得空气全部经过风道中的室内蒸发器42中进行换热；在干燥中后期，控制打开风量调节阀71，使得空气部分经过风道中的室内蒸发器42中进行换热、部分经由旁通通道70被旁通。
在干燥初期，被干物料含水量大，关闭风量调节阀71，使循环空气全部经过室内除湿蒸发器；在物料干燥中后期，被干物料的含水量逐渐降低，此时应根据除湿蒸发器前空气的含湿量情况适当调节风量调节阀71的开度，使部分循环空气通过旁通通道流出，减少经过除湿蒸发器的循环风量，使室内蒸发器42的蒸发温度低于循环空气的露点温度，满足除湿要求。
如图1或图2所示，热泵干燥系统包括压缩机1、干燥冷凝器21、第一节流装置31和第二节流装置32、室外蒸发器41、室内蒸发器42、第一风机8。压缩机具有两个相互独立的吸气口分别与压缩机内部的两个压缩缸相连通，制冷剂在两个蒸发器中吸热汽化后的气体经过压缩机内部的两个压缩缸体压缩后混合，通过排气管排至干燥冷凝器21中，高温高压的制冷剂气体在干燥房内部风道中放热后变为高压过冷液体，过冷液体制冷剂分别经过两个节流装置节流降压后进入蒸发器中蒸发吸热。
烘干装置包括干燥房6、风量调节阀71、第二风机5和风道110等。循环风经过室内蒸发器42之前设置有旁通通道70，通过风量调节阀71的调节作用用于控制旁通风量与经过除湿蒸发器的风量比。干燥房内的循环空气在循环风机的作用下，经过室内蒸发器42降温除湿后，冷凝水通过设置在除湿蒸发器下的排水装置排出至干燥房外部。除湿后的空气经过风道与系统冷凝器进行热交换后，变为高温低湿状态后进入干燥房内与被烘干物料进行热量交换。同时室外蒸发器与室外环境空气进行热量交换，将室外空气热量通过冷凝器转运至干燥房内部的循环空气，用于提升干燥房内的烘干温度。
通过控制第一风机8的转速来控制干燥房内部的升温速度，在启动升温阶段，通过适当提高压缩机1的运行频率及第一风机8的转速，增加室外蒸发器的换热量；当干燥房内的空气温度达到一定的设定值后，进入除湿阶段，可适当降低第一风机8的转速，适当降低外侧蒸发器的换热量。
风量调节阀71控制通过除湿蒸发器的循环空气流量：在干燥初期，被干物料含 水量大，关闭风量调节阀，使循环空气全部经过室内除湿蒸发器；在物料干燥中后期，被干物料的含水量逐渐降低，此时应根据除湿蒸发器前空气的含湿量情况适当调节风量调节阀71的开度，使部分循环空气通过旁通通道流出，减少经过除湿蒸发器的循环风量，使室内蒸发器42的蒸发温度低于循环空气的露点温度，满足除湿要求。
如图4所示，压缩机1的两个吸气口通过第一二通阀91、第二二通阀92、第三二通阀93分别与室外蒸发器41和室内蒸发器42相连通，其中靠近压缩机油池的排气口经过油分离器13相连，排气在油分离器中进行润滑油与制冷剂的分离后排出至冷凝器中，经过分离后的润滑油通过回油控制阀和回油毛细后返回至压缩机油池。从油分离器中排出的高压制冷剂排气与另外一个压缩缸的排气通过第四二通阀94、第五二通阀95、第六二通阀96与干燥冷凝器21、室外冷凝器22中的一个或两个相连通。高温制冷剂气体在冷凝器冷凝为制冷剂液体后，分别通过第一节流装置31、第二节流装置32节流后进入室外蒸发器41、室内蒸发器42中，低温低压的制冷剂在蒸发器中吸收周围环境空气中的热量后变为饱和或过热制冷剂气体后，通过第一二通阀91、第二二通阀92、第三二通阀93进入压缩机吸气口，完成整个制冷剂循环过程。
干燥介质空气的循环流程如图4中的虚线所示，从干燥房6出来的高温高湿空气经过风量调节阀71的调节作用控制通过室内蒸发器42的的风量和旁通风量的比例。其中，经过蒸发器的风量与蒸发器中的制冷剂进行换热之后被降温除湿。降温除湿后的低温低湿空气与旁通空气混合后经过热泵系统的干燥冷凝器21加热后变为高温且含湿量较低的热空气。高温空气通过风道中连接的第二风机5的抽吸作用被送进干燥房内部，在干燥房内与被干燥物料进行热湿交换，从而将被干物料升温，并将物料挥发的水分带走，达到降低对被干物料的干燥作用。
如图4所示，在干燥初始阶段，在除湿的同时需要兼顾升温的需求，此时：与压缩机吸气口相连接的第一二通阀91、第三二通阀93打开、第二二通阀92关闭；同时与压缩机排气连通的第四二通阀94关闭、第五二通阀95、第六二通阀96打开。该模式下，室外蒸发器41从室外环境中吸收热量、室内蒸发器42对风道内的循环空气进行降温除湿处理，该系统中两个蒸发器分别于压缩机的两个独立的压缩缸连接，两个蒸发器能实现相互独立的蒸发温度，消除混合损失实现压缩机高效运行；干燥冷凝器21对干燥房内的循环空气进行加热，以实现干燥房升温的需求。
当温度升高到设定值时，需要进入恒温除湿模式时：与压缩机吸气口相连接的第二二通阀92、第三二通阀93打开、第一二通阀91关闭；同时与压缩机排气连通的第 五二通阀95关闭、第四二通阀94、第六二通阀96打开。该模式下，室外蒸发器41内无制冷剂流过，室内循环空气在室内蒸发器42降温除湿后内干燥冷凝器21加热升温，同时放置在室外冷凝器22通过制冷剂在其中的放热作用将热量传递至室外，满足维持室内温度恒定的需求。
在干燥完成，需要降温时开启降温模式，此时：与压缩机吸气口相连接的第二二通阀92、第三二通阀93打开、第一二通阀91关闭；同时与压缩机排气连通的第六二通阀96关闭、第四二通阀94、第五二通阀95打开。此时，室内蒸发器42吸收室内循环空气的热量，通过室外冷凝器22将热量转移至室外，满足降温需求。
如图2所示，压缩机两个吸气管之间增加一根连接管和三个二通阀(第一二通阀91、第二二通阀92、第三二通阀93)，通过三个二通阀的开闭组合，实现热泵干燥系统运行模式的转换。
在干燥启动阶段的升温运行模式下，第一二通阀91、第二二通阀92开启、第三二通阀93关闭，压缩机1的两个吸气口同时与室外蒸发器41相连接，室内蒸发器42中无制冷剂流过。系统为快速循环运行模式，即从室外环境中吸收热量用于干燥房内部物料的预热，直至物料温度达到设定值是开始进如除湿模式。
在除湿升温阶段，第一二通阀91、第三二通阀93打开、第二二通阀92关闭，压缩机的两个吸气口分别与室外蒸发器41和室内蒸发器42相连接，室内蒸发器42用于除湿并回收潜热能量、室外蒸发器41用于吸收室外环境空气热量用于干燥房内部物料的升温。
在单除湿模式及闭式循环模式，第二二通阀92、第三二通阀93打开、第一二通阀91关闭，压缩机的两个吸气口同时与室内蒸发器42相连接，室外蒸发器41中无制冷剂流通，用于对室内物料进行除湿处理。
这里需要说明的是，图3与图2的不同之处在于，如图3所示，压缩机两个吸气管之间的三个二通阀(第一二通阀91、第二二通阀92、第三二通阀93)用两个三通阀(第一三通阀101和第二三通阀102)代替，其运行模式相同。
以上所述仅为本公开的较佳实施例而已，并不用以限制本公开，凡在本公开的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本公开的保护范围之内。以上所述仅是本公开的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本公开技术原理的前提下，还可以做出若干改进和变型，这些改进和变型也应视为本公开的保护范围。

Claims (20)

  1. 一种热泵干燥系统，包括：
    压缩机(1)、烘干装置(100)、干燥冷凝器(21)、室外蒸发器(41)和室内蒸发器(42)，所述干燥冷凝器(21)与所述压缩机(1)的排气端连通，以便对所述烘干装置(100)内的空气进行加热，所述室外蒸发器(41)与所述压缩机(1)的吸气端连通，以便对所述烘干装置(100)外部进行吸热，所述室内蒸发器(42)与所述压缩机(1)的吸气端连通，以便对所述烘干装置(100)内的空气进行除湿。
  2. 根据权利要求1所述的热泵干燥系统，其中：
    所述压缩机(1)包括第一压缩缸(11)和第二压缩缸(12)，所述室外蒸发器(41)所在的第一支路(201)的第一端与所述第一压缩缸(11)的吸气端连通，所述室内蒸发器(42)所在的第二支路(202)的第一端与所述第二压缩缸(12)的吸气端连通。
  3. 根据权利要求2所述的热泵干燥系统，其中：
    所述第一压缩缸(11)和所述第二压缩缸(12)的排气混合后、通过所述压缩机(1)的排气端排出压缩机。
  4. 根据权利要求2所述的热泵干燥系统，其中：
    在所述第一支路(201)上设有第一节流装置(31)，所述第一节流装置(31)沿制冷剂流动方向位于所述室外蒸发器(41)的上游侧；在所述第二支路(202)上设有第二节流装置(32)，所述第二节流装置(32)沿制冷剂流动方向位于所述室内蒸发器(42)的上游侧；所述热泵干燥系统还包括对所述室外蒸发器(41)散热的第一风机(8)。
  5. 根据权利要求1所述的热泵干燥系统，其中：
    所述烘干装置(100)包括干燥房(6)，所述干燥房(6)内设置有需烘干的物料；所述烘干装置(100)还包括风道(110)，所述风道(110)与所述干燥房(6)连通，所述风道(110)在所述室内蒸发器(42)中使得风道内的空气与制冷剂进行 换热，所述风道(110)在所述干燥冷凝器(21)中使得风道内的空气与制冷剂进行换热。
  6. 根据权利要求5所述的热泵干燥系统，其中：
    所述烘干装置(100)还包括与所述风道(110)连通设置的第二风机(5)；
    所述干燥冷凝器(21)沿风道(110)中空气流动方向位于所述室内蒸发器(42)的下游侧。
  7. 根据权利要求5所述的热泵干燥系统，还包括：
    与所述风道(110)连通的旁通通道(70)，所述旁通通道(70)的第一端沿空气流动方向位于所述室内蒸发器(42)的上游侧，所述旁通通道(70)的第二端沿空气流动方向位于所述室内蒸发器(42)下游侧，所述旁通通道(70)中还设置有风量调节阀(71)。
  8. 根据权利要求1所述的热泵干燥系统，还包括：
    设置在所述第一支路(201)上的第一二通阀(91)，所述第一二通阀(91)位于所述室外蒸发器(41)和所述第一压缩缸(11)的吸气端之间；
    设置在所述第二支路(202)上的第三二通阀(93)，所述第三二通阀(93)位于所述室内蒸发器(42)和所述第二压缩缸(12)的吸气端之间；
    与所述第一支路(201)和所述第二支路(202)连通的第三支路(203)，所述第三支路(203)的第一端位于所述第一二通阀(91)与所述第一压缩缸(11)的吸气端之间，所述第三支路(203)的第二端位于所述第三二通阀(93)与所述第二压缩缸(12)的吸气端之间，在所述第三支路(203)上还设置有第二二通阀(92)。
  9. 根据权利要求1所述的热泵干燥系统，还包括：
    设置在所述第一支路(201)上的第一三通阀(101)，所述第一三通阀(101)的第一端与所述室外蒸发器(41)连通，所述第一三通阀(101)的第二端与所述第一压缩缸(11)的吸气端连通；
    设置在所述第二支路(202)上的第二三通阀(102)，，所述第二三通阀(102)的第一端与所述室内蒸发器(42)连通，所述第二三通阀(102)的第二端与所述第 二压缩缸(12)的吸气端连通；
    所述第一三通阀(101)的第三端与所述第二三通阀(102)的第三端连通。
  10. 根据权利要求1所述的热泵干燥系统，其中：
    所述室外蒸发器(41)的第二端与所述干燥冷凝器(21)的第二端连通，所述室内蒸发器(42)的第二端与所述干燥冷凝器(21)的第二端连通，所述干燥冷凝器(21)的第一端与所述压缩机(1)的排气端连通。
  11. 根据权利要求2-10中任一项所述的热泵干燥系统，其中：
    所述排气端包括与所述第一压缩缸(11)相连通的第一排气口和与所述第二压缩缸(12)相连通的第二排气口；
    所述热泵干燥系统还包括室外冷凝器(22)，所述室外冷凝器(22)的第一端与所述第二排气口连通，所述室外冷凝器(22)的第二端与所述室内蒸发器(42)的第二端连通；所述干燥冷凝器(21)的第一端与所述第一排气口连通，所述干燥冷凝器(21)的第二端与所述室外蒸发器(41)的第二端连通。
  12. 根据权利要求11所述的热泵干燥系统，还包括：
    与所述室外冷凝器(22)与所述第二压缩缸(12)连通的第四支路(204)，在所述第四支路(204)上设置有第四二通阀(94)；
    与所述干燥冷凝器(21)与所述第一压缩缸(11)连通的第五支路(205)，在所述第五支路(205)上设置有第六二通阀(96)；
    与所述第四支路(204)和所述第五支路(205)连通的第六支路(206)，所述第六支路(206)的第一端位于所述第四二通阀(94)和所述第二压缩缸(12)的排气口之间，所述第六支路(206)的第二端位于所述第六二通阀(96)和所述第一压缩缸(11)的排气口之间，所述第六支路(206)上还设置有第五二通阀(95)。
  13. 根据权利要求11所述的热泵干燥系统，还包括：
    与所述室外冷凝器(22)和所述第二压缩缸(12)连通的第四支路(204)，所述第四支路(204)上设置有第三三通阀(103)，所述第三三通阀(103)的第一端与所述室外冷凝器(22)连通，所述第三三通阀(103)的第二端与所述第二压缩缸 (12)的排气口连通；
    与所述干燥冷凝器(21)和所述第一压缩缸(11)连通的第五支路(205)，所述第五支路(205)上设置有第四三通阀(104)，所述第四三通阀(104)的第一端与所述干燥冷凝器(21)连通、所述第四三通阀(104)的第二端与所述第一压缩缸(11)的排气口连通；
    所述第三三通阀(103)的第三端与所述第四三通阀(104)的第三端连通。
  14. 根据权利要求11所述的热泵干燥系统，其中：
    所述第一压缩缸(11)和所述第二压缩缸(12)上下布置，所述第二压缩缸(12)位于所述第一压缩缸(11)的下方，并且所述第四支路(204)上还设置有油分离器(13)，所述油分离器(13)的底部通过油回路(131)与压缩机的底部连通，所述油回路上设置有回油控制阀和回油毛细管。
  15. 一种热泵干燥系统的控制方法，其中：
    使用权利要求1-14中任一项所述热泵干燥系统，对烘干装置进行除湿控制。
  16. 根据权利要求15所述的控制方法，其中：
    在所述热泵干燥系统包括第一二通阀(91)、第二二通阀(92)和第三二通阀(93)的情况下：
    在需要对烘干装置进行升温干燥的情况下，控制所述第一二通阀(91)和所述第二二通阀(92)打开，控制所述第三二通阀(93)关闭；
    在需要对烘干装置进行升温除湿的情况下，控制所述第一二通阀(91)和所述第三二通阀(93)打开，控制所述第二二通阀(92)关闭；
    在需要对烘干装置进行恒温除湿的情况下，控制所述第二二通阀(92)和所述第三二通阀(93)打开，控制所述第一二通阀(91)关闭。
  17. 根据权利要求15所述的控制方法，其中：
    在所述热泵干燥系统包括第一三通阀(101)和第二三通阀(102)的情况下：
    在需要对烘干装置进行升温干燥的情况下，控制所述第一三通阀(101)的第一端和第二端、第三端均连通，控制所述第二三通阀(102)的第一端关闭、第二端和 第三端连通；
    在需要对烘干装置进行升温除湿的情况下，控制所述第一三通阀(101)的第一端和第二端连通、第三端关闭，控制所述第二三通阀(102)的第一端和第二端连通、第三端关闭；
    在需要对烘干装置进行恒温除湿的情况下，控制所述第一三通阀(101)的第一端关闭、第二端和第三端连通，控制所述第二三通阀(102)的第一端、第二端和第三端均连通。
  18. 根据权利要求16或17所述的控制方法，其中：
    在所述热泵干燥系统包括室外冷凝器(22)、第四二通阀(94)、第五二通阀(95)、第六二通阀(96)的情况下：
    在需要对烘干装置进行升温干燥或在需要对烘干装置进行升温除湿的情况下，控制所述第五二通阀(95)和所述第六二通阀(96)打开、控制所述第四二通阀(94)关闭；
    在需要对烘干装置进行恒温除湿的情况下，控制所述第四二通阀(94)和所述第六二通阀(96)打开、控制所述第五二通阀(95)关闭；
    在需要对烘干装置进行降温除湿的情况下，控制所述第二二通阀(92)和所述第三二通阀(93)打开、控制所述第一二通阀(91)关闭，且控制所述第四二通阀(94)和所述第五二通阀(95)打开、控制所述第六二通阀(96)关闭。
  19. 根据权利要求16或17所述的控制方法，其中：
    在所述热泵干燥系统包括包括室外冷凝器(22)、第三三通阀(103)和第四三通阀(104)的情况下：
    在需要对烘干装置进行升温干燥或在需要对烘干装置进行升温除湿的情况下，控制所述第三三通阀(103)的第二端和第三端连通、第一端关闭，控制所述第四三通阀(104)的第一端、第二端和第三端均连通；
    在需要对烘干装置进行恒温除湿的情况下，控制所述第三三通阀(103)的第一端和第二端连通、第三端关闭，控制所述第四三通阀(104)的第一端和第二端连通、第三端关闭；
    在需要对烘干装置进行降温除湿的情况下，控制所述第三三通阀(103)的第一 端、第二端和第三端均连通，控制所述第四三通阀(104)的第一端关闭、第二端和第三端连通。
  20. 根据权利要求15所述的控制方法，其中：
    在所述热泵干燥系统包括旁通通道(70)和风量调节阀(71)的情况下，在干燥初期控制关闭所述风量调节阀(71)，使得空气全部经过风道中的室内蒸发器(42)中进行换热；在干燥中后期控制打开所述风量调节阀(71)，使得空气中的一部分经过风道中的室内蒸发器(42)中进行换热、空气中的另一部分经由所述旁通通道(70)被旁通。
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