A single cold and heat source fresh air humidification unit

Abstract

The present invention belongs to a fresh air humidification unit, specifically relates to a single cold and heat source fresh air humidification unit, including an indoor unit and an outdoor unit, the indoor unit including an air inlet, a filter assembly, an evaporator, a reheat condenser, a humidifier, a fan and an air outlet arranged in sequence, the outdoor unit including a four-way valve and a compressor, a condenser and an outdoor expansion valve forming a loop with the evaporator, the evaporator, the compressor and the condenser are all connected to the four-way valve, a radiator is provided on the condenser, the reheat condenser is connected in parallel with the condenser through a pipeline, and a reheat expansion valve is provided on the pipeline where the reheat condenser is close to the evaporator. The present invention adopts a single cold and heat source to process the air, and the heating temperature of the reheat condenser can be controlled by adjusting the flow ratio of the reheat expansion valve and the main expansion valve, which can realize stepless adjustment and the adjustment process is simple and flexible.

Description

Technical Field

[0001] The present invention relates to a fresh air humidity control unit, in particular to a fresh air humidity control unit with a single cold or heat source. Background Art

[0002] As living standards improve, people's expectations for their living environments continue to rise. Homes and workplaces require not only fresh air systems for indoor and outdoor ventilation, but also corresponding air handling equipment for controlling air temperature, humidity, and PM2.5 levels. For a new home, the available air conditioning equipment includes fresh air purification systems for indoor and outdoor ventilation, air conditioning systems for regulating indoor temperature, dehumidification systems for regulating indoor humidity, and winter humidification systems. Excessive piping not only complicates installation, but also increases design and construction costs, and creates complications for subsequent maintenance.

[0003] In existing dual-cooling-source fresh air units, a heat pump provides chilled water to pre-cool the fresh air during dehumidification, while a direct expansion system performs deep dehumidification and temperature control. The direct expansion system has two condensers: a primary and a secondary condenser. The secondary condenser recovers some of the condensation heat to heat the dehumidified air, while the primary condenser dissipates the condensation heat. However, in current dual-cooling-source fresh air units, the condensation heat discharged from the primary condenser is directly discharged to the heat pump, which then cools the chilled water, heated by the absorption of the condensation heat, for recycling. Cooling this heated water consumes excess energy, which reduces the system's energy efficiency. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a single-cold and heat source fresh air humidity control unit which is convenient for adjusting temperature and humidity and has a compact structure.

[0005] The content of the present invention includes an indoor unit and an outdoor unit. The indoor unit includes an air inlet, a filter assembly, an evaporator, a reheat condenser, a humidifier, a fan and an air outlet arranged in sequence. The outdoor unit includes a four-way valve and a compressor, a condenser and an outdoor expansion valve that form a loop with the evaporator. The evaporator, the compressor and the condenser are all connected to the four-way valve. A radiator is provided on the condenser. The reheat condenser is connected in parallel with the condenser through a pipeline. A reheat expansion valve is provided on the pipeline where the reheat condenser is close to the evaporator.

[0006] Furthermore, a main expansion valve is provided between the evaporator and the condenser and close to the evaporator. Either the main expansion valve or the outdoor expansion valve is used selectively. The main expansion valve is connected in parallel with a one-way valve toward the condenser, and the outdoor expansion valve is connected in parallel with a one-way valve toward the evaporator.

[0007] Furthermore, filters are provided on the pipelines of the condenser and the reheat condenser close to the evaporator.

[0008] Furthermore, the air inlet includes a return air valve communicating with indoor air and a fresh air valve communicating with outdoor air.

[0009] Furthermore, an ultraviolet lamp is provided between the humidifier and the fan.

[0010] Furthermore, the fan is a centrifugal fan.

[0011] Furthermore, the radiator is an axial flow fan.

[0012] Furthermore, the filter assembly includes a primary filter, a medium filter and a high efficiency filter arranged in sequence.

[0013] Furthermore, the primary filter and the high efficiency filter are provided with a wind pressure difference switch.

[0014] The present invention also includes a control system, which includes a controller and a temperature sensor, a temperature and humidity sensor, and a pressure sensor electrically connected to the controller. The temperature sensor is arranged between the evaporator and the reheat condenser, the temperature and humidity sensors are arranged on the air inlet and the air outlet, and the pressure sensor is arranged on the compressor suction and exhaust pipes. The controller is also electrically connected to the compressor, the fan, and the radiator.

[0015] The beneficial effects of the present invention are as follows: the present invention uses a single cold and heat source to treat the air, avoiding the need for a water system to cooperate with the operation of dual-cold-source fresh air dehumidification units on the current market, thereby increasing the energy efficiency ratio of the system; in the dehumidification mode, the heating temperature of the reheat condenser can be controlled by adjusting the flow ratio of the reheat expansion valve and the main expansion valve, which can achieve stepless adjustment and a simple and flexible adjustment process; the reheat condenser recovers the condensation heat to increase the temperature of the air after cooling and dehumidification by the evaporator, thereby reducing the selection of other heating accessories and reducing the production cost and energy consumption of the unit; compared with the dual-cold-source humidification unit, there is no need to cool the condenser through a heat pump water machine, thereby improving the energy efficiency ratio of the system;

[0016] This fresh air humidification unit has the functions of dehumidifying, cooling and regulating fresh air in summer; humidifying and heating in winter; and ventilation in transitional seasons, with high adaptability and comfort; the overall structure is compact and highly efficient and energy-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the system principle during dehumidification of the present invention.

[0018] Figure 2 This is a diagram showing the working principle of the four-way valve during dehumidification according to the present invention.

[0019] Figure 3 This is a schematic diagram of the system principle of the present invention when heating.

[0020] Figure 4 This is a diagram showing the working principle of the four-way valve during heating according to the present invention.

[0021] In the figure, 1 is the return air valve, 2 is the fresh air valve, 3 is the primary filter, 4 is the medium efficiency filter, 5 is the high efficiency filter, 6 is the evaporator, 7 is the reheat condenser, 8 is the humidifier, 9 is the ultraviolet lamp, 10 is the fan, 11 is the air outlet, 12 is the reheat expansion valve, 13 is the main expansion valve, 14 is the compressor, 15 is the four-way valve, 16 is the outdoor expansion valve, 17 is the axial flow fan, 18 is the condenser, and 19 is the oil separator. DETAILED DESCRIPTION

[0022] like Figure 1-Figure 4 As shown, the present invention includes an indoor unit and an outdoor unit, the indoor unit includes an air inlet, a filter assembly, an evaporator 6, a reheat condenser 7, a humidifier 8, a fan 10 and an air outlet 11 arranged in sequence along the air circulation direction, the filter assembly is a component for filtering the air; the evaporator 6 is a component for cooling, dehumidifying or heating the air; the reheat condenser 7 is used to heat the cooled and dehumidified air when the evaporator 6 cools and dehumidifies the air; the humidifier 8 is used to humidify the heated air when the evaporator 6 heats the air; the fan 10 is used to supply air to the indoor unit from the air inlet side to the air outlet 11 side at positive pressure, the outdoor unit is used to provide a heat source or a cold source to the evaporator 6 and the reheat condenser 7, and includes a four-way valve 15 and a compressor 14, a condenser 14 and a circuit formed with the evaporator 6. 8 and an outdoor expansion valve 16, the evaporator 6, the compressor 14 and the condenser 18 are all connected to the oil ports corresponding to the four-way valve 15. By adjusting the four-way valve 15, the flow direction of the refrigerant can be adjusted to control the evaporator 6 to cool and dehumidify the air or heat the air. A radiator is provided on the condenser 18, and the radiator is used for the condenser 18 to dissipate heat or release cold energy. The reheat condenser 7 is connected in parallel with the condenser 18 through a pipeline. The reheat condenser 7 is used to recover part of the condensation heat to heat the air after cooling and dehumidification by the evaporator 6. The reheat condenser 7 is provided with a reheat expansion valve 12 on the pipeline where the evaporator 6 is located. By adjusting the output ratio of the reheat expansion valve 12 and the main expansion valve 13, the ratio of the refrigerant heat discharged by the reheat condenser 7 and the condenser 18 can be adjusted.

[0023] A main expansion valve 13 is provided between the evaporator 6 and the condenser 18 and close to the evaporator 6. The main expansion valve 13 and the outdoor expansion valve 16 are used selectively. In the dehumidification mode, the outdoor expansion valve 16 is closed and the main expansion valve 13 is operated to reduce the pressure of the high-pressure and normal-temperature refrigerant flowing out of the condenser 18. In the heating mode, the main expansion valve 13 is closed and the outdoor expansion valve 16 is operated to reduce the pressure of the high-pressure and normal-temperature refrigerant flowing out of the evaporator 6.

[0024] A main expansion valve 13 and an outdoor expansion valve 16 are provided between the condenser 18 and the evaporator 6 for use in cooling and heating of the evaporator 6, respectively. The main expansion valve 13 is provided on the side close to the evaporator 6, and the outdoor expansion valve 16 is provided on the side close to the condenser 18. This can avoid the refrigerant first passing through the evaporator 6 and the main expansion valve 13 to become a low-pressure and low-temperature liquid refrigerant, and then passing through a longer pipeline to the condenser 18 in the heating mode, thereby preventing the low-pressure and low-temperature liquid refrigerant from flowing through a longer pipeline and affecting the pipeline life.

[0025] A one-way valve is connected in parallel to the main expansion valve 13 toward the condenser 18; a one-way valve is connected in parallel to the outdoor expansion valve 16 toward the evaporator 6 to ensure that the pipeline is connected when either the main expansion valve 13 or the outdoor expansion valve 16 is used.

[0026] The condenser 18 and the reheat condenser 7 are both provided with filters on the side of the pipeline close to the evaporator 7. The filter is preferably a copper filter. The copper filter filters the refrigerant to prevent impurity particles in the refrigerant from clogging the expansion valve when passing through the expansion valve.

[0027] The air inlet includes a return air valve 1 connected to the indoor air and a fresh air valve 2 connected to the outdoor air. By adjusting the air intake ratio of the return air valve 1 and the fresh air valve 2, three air intake modes of fresh air, fresh return air mixture and full return air can be switched. When there is sufficient oxygen in the indoor air, the ratio of the return air valve 1 can be appropriately increased, thereby reducing the cooling or heat required to be generated in the humidification or heating mode of the humidification unit, thereby reducing energy consumption.

[0028] An ultraviolet lamp 9 is further provided between the humidifier 8 and the fan 10 , and the ultraviolet lamp 9 sterilizes the treated air to improve the air quality.

[0029] The radiator is an axial flow fan 17 , which has a large air volume and can effectively dissipate heat from the condenser 18 .

[0030] The filter assembly includes a primary filter 3, a medium filter 4 and a high efficiency filter 5 arranged in sequence. By setting up three layers of filter screens, the fresh air or return air is effectively filtered.

[0031] The primary filter 3 and the high-efficiency filter 5 are provided with a wind pressure difference switch, which is used to detect the blockage of the filter assembly. When there are many impurities in the filter assembly and it is detected that the wind pressure difference before the primary filter 3 and after the high-efficiency filter 5 is large, the wind pressure difference switch will work and generate an alarm to remind the staff to replace or clean the filter assembly in time.

[0032] The present invention also includes a control system, which includes a controller and a temperature sensor, a temperature and humidity sensor, and a pressure sensor electrically connected to the controller. The temperature sensor is arranged between the evaporator 6 and the reheat condenser 7, the temperature and humidity sensors are arranged on the air inlet and the air outlet 11, and the pressure sensor is arranged on the suction and exhaust pipes of the compressor 14. The controller is also electrically connected to the compressor 14, the fan 10, the axial fan 17, the reheat expansion valve 12, the main expansion valve 13 and the outdoor expansion valve 16. The control system realizes the automatic operation of the humidity control unit, wherein the controller adopts an industrial control-grade single-chip microcomputer chip, and the temperature sensor, the temperature and humidity sensor, and the pressure sensor are arranged on each node of the unit to obtain the temperature parameters of each measuring point as the control parameter basis of the controller intelligent control; for ease of control, in the present invention, the reheat expansion valve 12, the main expansion valve 13 and the outdoor expansion valve 16 are preferably electronic expansion valves.

[0033] The specific working principle of the present invention is:

[0034] The present invention has four modes: dehumidification mode, heating mode, ventilation mode and intelligent mode, as follows:

[0035] Dehumidification mode: Figure 1 and Figure 2 As shown, the refrigerant flows in the direction indicated by the arrow in the figure, and the low-pressure and low-temperature liquid refrigerant flows into the evaporator 6, absorbing the heat of the air flowing through the surface of the evaporator 6. Since the surface temperature of the evaporator 6 is lower than the dew point temperature of the wet air at this time, the water vapor in the air condenses into water on the surface of the evaporator 6, drips into the water pan and is discharged from the unit, thereby reducing the temperature and humidity in the air and performing cooling and dehumidification.

[0036] like Figure 2 As shown, the low-pressure, low-temperature gaseous refrigerant after absorbing heat from the evaporator 6 flows into the compressor 14 through the four-way valve 15, compressing the refrigerant. The refrigerant changes into a high-temperature, high-pressure gaseous refrigerant and passes through the oil separator 19 before flowing out through the four-way valve 15. The high-temperature, high-pressure gaseous refrigerant flowing out of the four-way valve 15 is divided and enters the condenser 18 and the reheat condenser 7 connected in parallel. The high-temperature, high-pressure gaseous refrigerant changes into a high-pressure, room-temperature liquid refrigerant. The high-temperature, high-pressure gaseous refrigerant entering the reheat condenser 7 heats the air cooled and dehumidified by the evaporator 6 to a specified temperature, and then passes through the ultraviolet lamp 9 for sterilization before entering the room, thereby completing the dehumidification and constant temperature functions without the need to add other heating equipment. Another portion of the high-temperature, high-pressure gaseous refrigerant passes through the condenser 18 for heat dissipation and is discharged outdoors in conjunction with the axial flow fan 17.

[0037] The air heating temperature of the reheat condenser 7 is determined by the flow rate of high-temperature, high-pressure gaseous refrigerant distributed to the reheat condenser 7, specifically by adjusting the flow rate ratio of the reheat expansion valve 12 to the main expansion valve 13. The reheat expansion valve 12 and the main expansion valve 13 preferably open and close in tandem. A higher flow rate at the reheat expansion valve 12 results in a lower flow rate at the main expansion valve 13. This results in more high-temperature, high-pressure gaseous refrigerant passing through the reheat condenser 7, resulting in a higher air heating temperature. Conversely, less high-temperature, high-pressure gaseous refrigerant passing through the reheat condenser 7 results in a lower air heating temperature. In dehumidification mode, the outdoor expansion valve 16 remains closed. Refrigerant flowing from the condenser 18 flows through the one-way valve connected in parallel with the outdoor expansion valve 16 and into the main expansion valve 13. At this point, the refrigerant flows in the opposite direction of the one-way valve connected in parallel with the main expansion valve 13, so the refrigerant flows only toward the main expansion valve 13. After passing through the main expansion valve 13, it is converted into low-pressure, low-temperature liquid refrigerant and flows into the evaporator 6 to absorb heat.

[0038] In this reciprocating process, the air is dehumidified and the temperature is adjusted.

[0039] In the dehumidification mode, since the main expansion valve 13 is arranged on the side close to the evaporator 6, the liquid refrigerant that has changed into a low-pressure and low-temperature state quickly enters the evaporator 6 to absorb heat, thereby reducing the impact of the low-pressure and low-temperature liquid refrigerant on the pipeline and improving its service life.

[0040] In the dehumidification mode, since there is no need to humidify the air, the humidifier 8 is always in the closed state.

[0041] In the dehumidification mode, the reheat expansion valve 12 is closed and the humidity control unit only cools the air.

[0042] Heating mode: Figure 3 and Figure 4 As shown, the refrigerant flows in the direction indicated by the dotted arrow in the figure. At this time, since the evaporator 6 is used for heat dissipation and the condenser 18 is used for heat absorption, there is no need to dehumidify the air passing through the humidity control unit, and the evaporator 6 and reheat condenser 7 in the indoor unit have opposite effects on the air, the reheat condenser 7 is always closed. The reheat condenser 7 is closed by closing the reheat expansion valve 12, which is simple and flexible to operate. Low-pressure and low-temperature liquid refrigerant flows into the condenser 18, and the axial flow fan 17 discharges the cold air to the outside. Figure 2As shown, the refrigerant passing through condenser 18 then flows through four-way valve 15 into compressor 14 for compression. The refrigerant becomes a high-temperature, high-pressure gaseous refrigerant and passes through oil separator 19. It then flows out through four-way valve 15 into evaporator 6. Evaporator 6 dissipates heat to the air, thereby heating the air entering from the air inlet. The heated air then passes through humidifier 8 to a specified humidity level to ensure appropriate indoor temperature and humidity. The high-temperature, high-pressure gaseous refrigerant after passing through evaporator 6 changes phase into a high-pressure, room-temperature liquid refrigerant. Finally, it passes through a one-way valve connected in parallel with main expansion valve 13 and flows to outdoor expansion valve 16 for pressure reduction. It becomes a low-temperature, low-pressure liquid refrigerant and flows to condenser 18 to remove the cooling energy.

[0043] This reciprocating process achieves heating and humidification of the air.

[0044] Since the outdoor expansion valve 16 is arranged near the condenser 18, the liquid refrigerant that has changed into low-pressure and low-temperature phase quickly enters the condenser 18 to absorb heat, thereby reducing the impact of the low-pressure and low-temperature liquid refrigerant on the pipeline and improving its service life.

[0045] By adjusting the power of the compressor, different temperatures can be adjusted.

[0046] The humidifier 8 may be an ultrasonic humidifier, a wet film humidifier or other humidifying equipment.

[0047] Ventilation mode: In a working environment where only ventilation is required indoors, it is only necessary to turn on the fan 10, and the air passes through the filter assembly and the ultraviolet lamp 9 in sequence to purify the air and complete the ventilation.

[0048] Smart mode: Intelligent adjustment is performed through the indoor air environment in conjunction with the controller installed on the humidity control unit and the temperature sensors, temperature and humidity sensors and pressure sensors on each node.

Claims

1. A single cold and heat source fresh air humidification unit, characterized by: The invention comprises an indoor unit and an outdoor unit, wherein the indoor unit comprises an air inlet, a filter assembly, an evaporator (6), a reheat condenser (7), a humidifier (8), a fan (10) and an air outlet (11) which are arranged in sequence, and the outdoor unit comprises a four-way valve (15) and a compressor (14), a condenser (18) and an outdoor expansion valve (16) which form a circuit with the evaporator (6). The evaporator (6), the compressor (14) and the condenser (18) are all connected to the four-way valve (15). A radiator is provided on the condenser (18). The reheat condenser (7) is connected in parallel with the condenser (18) through a pipeline. A reheat expansion valve (12) is provided on the pipeline of the reheat condenser (7) close to the evaporator (6). A condenser (18) is provided between the evaporator (6) and the condenser (18) and close to the evaporator (6). A main expansion valve (13) is provided on one side, and the main expansion valve (13) and the outdoor expansion valve (16) are selectively used. In the dehumidification mode, the outdoor expansion valve (16) is closed and the main expansion valve (13) is operated to reduce the pressure of the high-pressure normal-temperature refrigerant flowing out of the condenser (18); in the heating mode, the main expansion valve (13) is closed and the outdoor expansion valve (16) is operated to reduce the pressure of the high-pressure normal-temperature refrigerant flowing out of the evaporator (6). The main expansion valve (13) is connected in parallel with a one-way valve toward the condenser (18), and the outdoor expansion valve (16) is connected in parallel with a one-way valve toward the evaporator (6). The reheat expansion valve (12) and the main expansion valve (13) are linked to open and close. When the opening flow of the reheat expansion valve (12) is large, the opening flow of the main expansion valve (13) is small. The reheat expansion valve (12) and the main expansion valve (13) are connected in parallel.

2. The single cold and heat source fresh air humidification unit according to claim 1, characterized in that: Filters are provided on the pipelines of the condenser (18) and the reheat condenser (7) on the side close to the evaporator (6).

3. The single cold and heat source fresh air humidification unit according to claim 1, characterized in that: The air inlet comprises a return air valve (1) communicating with indoor air and a fresh air valve (2) communicating with outdoor air.

4. The single cold and heat source fresh air humidification unit according to claim 1, characterized in that: An ultraviolet lamp (9) is also provided between the humidifier (8) and the fan (10).

5. The single cold and heat source fresh air humidification unit according to claim 1, characterized in that: The fan (10) is a centrifugal fan.

6. The single cold and heat source fresh air humidification unit according to claim 1, characterized in that: The radiator is an axial flow fan (17).

7. The single cold and heat source fresh air humidification unit according to claim 1, characterized in that: The filter assembly comprises a primary filter (3), a medium filter (4) and a high efficiency filter (5) which are arranged in sequence.

8. The single cold and heat source fresh air humidification unit according to claim 7, characterized in that: The primary filter (3) and the high efficiency filter (5) are provided with a wind pressure difference switch.

9. The single cold and heat source fresh air humidification unit according to claim 1, characterized in that: The system also includes a control system, which includes a controller and a temperature sensor, a temperature and humidity sensor, and a pressure sensor electrically connected to the controller. The temperature sensor is arranged between the evaporator (6) and the reheat condenser (7), the temperature and humidity sensors are arranged on the air inlet and the air outlet (11), and the pressure sensor is arranged on the suction and exhaust pipes of the compressor (14). The controller is also electrically connected to the compressor (14), the fan (10), and the radiator.

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