CN110848794A - Single cold heat source fresh air humidifying unit - Google Patents

Abstract

The invention belongs to a fresh air humidity control unit, in particular to a fresh air humidity control unit with a single cold and heat source, comprising an indoor unit and an outdoor unit, wherein the indoor unit comprises an air inlet, a filter screen assembly, an evaporator, A reheat condenser, a humidifier, a fan and an air outlet, the outdoor unit includes a four-way valve and a compressor, a condenser and an outdoor expansion valve that form a loop with an evaporator, the evaporator, the compressor and the condenser are all connected with the A four-way valve is connected, a radiator is arranged on the condenser, the reheat condenser is connected in parallel with the condenser through a pipeline, and a reheat expansion valve is arranged on the pipeline where the reheat condenser is close to the evaporator. The present invention adopts a single cold heat source For air treatment, 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

A single cold and heat source fresh air humidity control unit

technical field

The invention belongs to a fresh air humidity control unit, in particular to a fresh air humidity control unit with a single cold and heat source.

Background technique

With the improvement of the quality of life, people's requirements for the living environment continue to increase. In the home and working environment, there are not only fresh air systems for indoor and outdoor ventilation, but also corresponding air treatment equipment for air temperature, humidity, and PM2.5 content in the air. For a new house, the available air-conditioning equipment includes a fresh air purification system for indoor and outdoor ventilation, an air-conditioning system for regulating indoor temperature, a dehumidification system for regulating indoor humidity, and a humidification system in winter, etc. Excessive piping design Not only is it difficult to install, but it also increases design and construction costs and brings trouble to subsequent maintenance.

And the existing double cold source fresh air unit, the heat pump water machine provides cold water to pre-cool the fresh air during dehumidification, and the direct expansion system performs deep dehumidification and temperature adjustment. The direct expansion system has two condensers, the main and the auxiliary. The auxiliary condenser recovers part of the condensation heat to heat the dehumidified air, and the main condenser discharges the condensation heat. At present, the condensation heat discharged from the main condenser of the dual-cold-source fresh air unit is directly discharged to the heat pump water machine, which requires the heat pump water machine to cool down the cold water that has absorbed the condensation heat and then heated up and then recycled. The heat pump water machine will consume excess energy to cool the cold water that has been heated up after absorbing the condensation heat, which reduces the energy efficiency ratio of the system.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a fresh air humidity control unit with a single cold and heat source, which is easy to adjust temperature and humidity and has a compact structure.

The content of the present invention includes an indoor unit and an outdoor unit, the indoor unit includes an air inlet, a filter screen assembly, an evaporator, a reheat condenser, a humidifier, a fan and an air outlet, and 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 with a four-way valve, the condenser is provided with a radiator, and the reheated condenser passes through a pipe The circuit is connected in parallel with the condenser, and a reheat expansion valve is arranged on the pipeline where the reheat condenser is close to the evaporator.

Further, a main expansion valve is arranged between the evaporator and the condenser and on the side close to the evaporator. The main expansion valve and the outdoor expansion valve are used alternatively. The main expansion valve is connected in parallel with a check valve facing the condenser. The expansion valve is connected in parallel with a one-way valve towards the evaporator.

Further, filters are provided on the pipelines on the side of the condenser and the reheat condenser close to the evaporator.

Further, the air inlet includes a return air damper communicated with indoor air and a fresh air damper communicated with outdoor air.

Furthermore, an ultraviolet lamp is also arranged between the humidifier and the fan.

Further, the fan is a centrifugal fan,

Further, the radiator is an axial flow fan,

Further, the filter screen assembly includes an initial effect filter, a medium effect filter and a high efficiency filter which are arranged in sequence.

Further, the primary filter and the high-efficiency filter are provided with an air pressure differential switch.

The present invention also includes a control system, the control system 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, so The temperature and humidity sensor is arranged on the air inlet and the air outlet, the pressure sensor is arranged on the suction and exhaust pipes of the compressor, and the controller is also electrically connected with the compressor, the fan and the radiator.

The beneficial effect of the present invention is that the present invention uses a single cold and heat source to process the air, which avoids the need for the water system to cooperate with the current market, such as the dual cold source fresh air dehumidification unit, and increases the energy efficiency ratio of the system. In the dehumidification mode, the reheating condenser The heating temperature 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; the reheat condenser can recover the condensation heat to increase the temperature of the air after cooling and dehumidification by the evaporator, reducing the The selection of other heating accessories reduces the production cost and energy consumption of the unit; compared with the dual-cooling source humidity control unit, there is no need to cool the condenser through the heat pump water machine, which improves the energy efficiency ratio of the system;

The fresh air humidity control unit has the functions of fresh air dehumidification, cooling and temperature adjustment in summer; humidification and heating in winter; ventilation function in transition season, high adaptability and comfort; overall compact structure, high efficiency and energy saving.

Description of drawings

FIG. 1 is a schematic diagram of the system during dehumidification of the present invention.

Fig. 2 is the working principle diagram of the four-way valve during dehumidification of the present invention.

FIG. 3 is a schematic diagram of the system during heating according to the present invention.

Fig. 4 is the working principle diagram of the four-way valve during heating according to the present invention.

In the picture, 1 return air damper, 2 fresh air damper, 3 primary filter, 4 medium efficiency filter, 5 high efficiency filter, 6 evaporator, 7 reheat condenser, 8 humidifier, 9 ultraviolet lamp, 10 fans, 11 air outlets, 12 reheat expansion valves, 13 main expansion valves, 14 compressors, 15 four-way valves, 16 outdoor expansion valves, 17 axial fans, 18 condensers, 19 oil separators.

Detailed ways

As shown in FIGS. 1-4 , the present invention includes an indoor unit and an outdoor unit, and the indoor unit includes an air inlet, a filter screen assembly, an evaporator 6 , a reheat condenser 7 , and a humidifier 8 arranged in sequence along the air circulation direction. , fan 10 and air outlet 11, the filter screen assembly is a component for filtering the air; the evaporator 6 is a component for cooling and dehumidifying or heating the air; the reheat condenser 7 is used when the evaporator 6 cools and dehumidifies the air. Heating the air after cooling and dehumidifying; the humidifier 8 is used to humidify the heated air when the evaporator 6 heats the air; the fan 10 is used to supply the air of the indoor unit from the air inlet side to the air outlet 11 side with positive pressure , the outdoor unit is used to provide a heat source or a cold source for the evaporator 6 and the reheat condenser 7, and includes a four-way valve 15 and a compressor 14, a condenser 18 and an outdoor expansion valve 16 that form a circuit with the evaporator 6, so 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 refrigerate and dehumidify the air. Or to heat the air, the condenser 18 is provided with a radiator, 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, and the reheat condenser 7 is used for Part of the condensation heat is recovered to heat the air cooled and dehumidified 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 , to adjust the ratio of the refrigerant heat discharged by both the reheat condenser 7 and the condenser 18 .

A main expansion valve 13 is arranged between the evaporator 6 and the condenser 18 and on the side close to the evaporator 6. The main expansion valve 13 and the outdoor expansion valve 16 are used alternatively. In the dehumidification mode, the outdoor expansion valve 16 is closed, and the main expansion valve 16 is closed. The valve 13 works to reduce the pressure of the high-pressure and normal-temperature refrigerant flowing out from the condenser 18; in the heating mode, the main expansion valve 13 is closed, and the outdoor expansion valve 16 works to reduce the high-pressure and normal-temperature refrigerant flowing from the evaporator 6. refrigerant pressure;

A main expansion valve 13 and an outdoor expansion valve 16 are arranged between the condenser 18 and the evaporator 6 for cooling and heating of the evaporator 6 respectively. The main expansion valve 13 is arranged on the side close to the evaporator 6, and the outdoor expansion valve 16 is arranged on the side close to the condenser 18 to avoid that in the heating mode, the refrigerant first passes through the evaporator 6 and the main expansion valve 13 to become a low-pressure and low-temperature liquid refrigerant, and then passes through a long pipeline to the condenser 18. , so as to prevent the low-pressure and low-temperature liquid refrigerant from flowing through the long pipeline and affecting the pipeline life.

The main expansion valve 13 is connected in parallel with a one-way valve facing the condenser 18; the outdoor expansion valve 16 is connected in parallel with a one-way valve facing the evaporator 6, so as to ensure that when the main expansion valve 13 and the outdoor expansion valve 16 are used alternatively, Pipeline connection.

The condenser 18 and the reheating condenser 7 are provided with filters on the side pipeline near the evaporator 7, and the filters are preferably copper filters. The copper filters filter the refrigerant to prevent the impurity particles in the refrigerant from passing through. Block the expansion valve when expanding the valve.

The air inlet includes a return air valve 1 that communicates with indoor air and a fresh air valve 2 that communicates with outdoor air. There are three air intake modes: air mixing and full return air. When the indoor air has enough oxygen, the proportion of return air valve 1 can be appropriately increased, which can reduce the cooling capacity that needs to be generated in the humidity control or temperature increase mode of the humidity control unit. or heat to reduce energy consumption.

An ultraviolet lamp 9 is also arranged between the humidifier 8 and the fan 10, and the ultraviolet lamp 9 sterilizes the treated air to improve air quality.

The radiator is an axial flow fan 17 , and the axial flow fan 17 has a large air volume and can effectively dissipate heat to the condenser 18 .

The filter screen assembly includes a primary-efficiency filter 3, a medium-efficiency filter 4 and a high-efficiency filter 5 that are arranged in sequence, and the fresh air or return air can be effectively filtered by setting three layers of filter screens.

The primary filter 3 and the high-efficiency filter 5 are provided with an air pressure differential switch, and the wind pressure differential switch is used to detect the blockage of the filter screen assembly. When the wind pressure difference with the high-efficiency filter 5 is large, the wind pressure difference switch will work, and an alarm will be generated to remind the staff to replace or clean the filter screen assembly in time.

The present invention also includes a control system, the control system 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 sensor is arranged on the air inlet and outlet 11, the pressure sensor is arranged on the suction and exhaust pipes of the compressor 14, and the controller is also connected with the compressor 14, the fan 10, the axial flow fan 17, and the reheat expansion valve. 12. The main expansion valve 13 and the outdoor expansion valve 16 are electrically connected, and the control system realizes the automatic operation of the humidity control unit. The controller adopts an industrial control-level single-chip microcomputer chip, and the temperature sensor, temperature and humidity sensor, and pressure sensor are arranged at each node of the unit. In the above, the temperature parameters used to obtain each measurement point are used as the control parameter basis for the intelligent control of the controller; in order to facilitate 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.

The concrete working principle of the present invention:

The present invention has four modes: dehumidification mode, heating mode, ventilation mode and intelligent mode, the details are as follows:

Dehumidification mode: As shown in Figure 1 and Figure 2, 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 to absorb the heat of the air flowing through the surface of the evaporator 6. The surface temperature of the evaporator 6 is lower than the dew point temperature of the humid air, and the water vapor in the air condenses into water on the surface of the evaporator 6, drops into the water tray and then discharges the unit, thereby reducing the temperature and humidity in the air, and cooling and dehumidifying.

As shown in FIG. 2 , the low-pressure and low-temperature gaseous refrigerant after absorbing heat from the evaporator 6 flows into the compressor 14 through the four-way valve 15 to compress the refrigerant. The refrigerant phase changes into a high-temperature and high-pressure gaseous refrigerant and passes through the oil separator 19, Then it flows out through the four-way valve 15. The high-temperature and high-pressure gaseous refrigerant flowing out of the four-way valve 15 is divided into the condenser 18 and the reheat condenser 7 which are connected in parallel with each other. The high temperature and high pressure gaseous refrigerant will heat the air cooled and dehumidified by the evaporator 6 to a specified temperature, and enter the room after being sterilized by the ultraviolet lamp 9, so as to complete the functions of dehumidification and constant temperature, and there is no need to add other heating equipment; another part of the high temperature The high-pressure gaseous refrigerant passes through the condenser 18 for heat dissipation, and cooperates with the axial flow fan 17 to be discharged outdoors.

The heating temperature of the air by the reheating condenser 7 is determined by the flow rate of the high-temperature and high-pressure gaseous refrigerant distributed to the reheating condenser 7, that is, by adjusting the flow ratio of the reheating expansion valve 12 and the main expansion valve 13. 12 and the main expansion valve 13 are preferably linked opening and closing, the opening flow rate of the reheat expansion valve 12 is large, the opening flow rate of the main expansion valve 13 is small, the high temperature and high pressure gaseous refrigerant passing through the reheat condenser 7 is large, and the heating temperature of the air is high, On the contrary, the amount of high-temperature and high-pressure gaseous refrigerant passing through the reheat condenser 7 is low, and the heating temperature of the air is low. In the dehumidification mode, the outdoor expansion valve 16 is always in a closed state, and the refrigerant flowing out of the condenser 18 flows into the main expansion valve 13 through the one-way valve connected in parallel with the outdoor expansion valve 16. At this time, the refrigerant flows to the main expansion valve and the main expansion valve. The one-way valve 13 connected in parallel is opposite, so the refrigerant only flows to the main expansion valve 13, and passes through the main expansion valve 13 into a low-pressure and low-temperature liquid refrigerant, and then flows into the evaporator 6 to absorb heat.

In this way, the air is dehumidified and temperature adjusted.

In the dehumidification mode, since the main expansion valve 13 is arranged on the side close to the evaporator 6, the liquid refrigerant with low pressure and low temperature will soon enter the evaporator 6 to absorb heat, so the low pressure and low temperature liquid refrigeration can be reduced. The effect of the agent on the pipeline is improved, and the service life is improved.

In the dehumidification mode, since there is no need to humidify the air, the humidifier 8 is always turned off.

In the dehumidification mode, the reheat expansion valve 12 is closed, and the humidification unit only cools the air.

Heating mode: As shown in Figure 3 and Figure 4, 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 adjust the humidity. The air of the unit is dehumidified, and the effect of the evaporator 6 and the reheat condenser 7 on the air in the indoor unit is opposite, so the reheat condenser 7 is always closed, and the reheat condenser 7 is closed by closing the reheat expansion valve 12. The operation is simple and flexible . The low-pressure and low-temperature liquid refrigerant flows into the condenser 18, and the axial flow fan 17 discharges the cold energy to the outside. As shown in FIG. 2, the refrigerant passing through the condenser 18 flows into the compressor 14 through the four-way valve 15 for compression and refrigeration. The refrigerant becomes a high-temperature and high-pressure gaseous refrigerant and passes through the oil separator 19, and then flows out into the evaporator 6 through the four-way valve 15. The evaporator 6 dissipates heat to the air, thereby heating the air entering from the air inlet. The latter air is then added to the specified humidity through the humidifier 8 to ensure proper indoor temperature and humidity. The high-temperature and high-pressure gaseous refrigerant after passing through the evaporator 6 is transformed into a high-pressure and normal-temperature liquid refrigerant, and finally flows to the outdoor expansion valve 16 through the one-way valve connected in parallel with the main expansion valve 13 to be depressurized and become a low-temperature and low-pressure liquid refrigerant. The agent flows to the condenser 18 to take away the cooling capacity.

This reciprocation achieves heating and humidification of the air.

Since the outdoor expansion valve 16 is arranged on the side close to the condenser 18, at this time, the low-pressure and low-temperature liquid refrigerant will soon enter the condenser 18 to absorb heat, thus reducing the impact of the low-pressure and low-temperature liquid refrigerant on the pipeline. influence and increase the service life.

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

The humidifier 8 may be an ultrasonic humidifier, a wet film humidifier or other humidification equipment.

Ventilation mode: In the indoor working environment where only ventilation is required, only the fan 10 needs to be turned on, and the air passes through the filter assembly and the ultraviolet lamp 9 in turn to purify the air and complete the ventilation.

Intelligent mode: Intelligent adjustment is carried out through the indoor air environment in conjunction with the controller set on the humidity control unit and the temperature sensors, temperature and humidity sensors and pressure sensors on each node.

Claims (10)

1. The utility model provides a single cold heat source fresh air humidifying unit, characterized by, includes indoor set and off-premises station, the indoor set is including air intake, filter screen subassembly, evaporimeter (6), reheat condenser (7), humidifier (8), fan (10) and air outlet (11) that set gradually, the off-premises station includes cross valve (15) and constitutes compressor (14), condenser (18) and outdoor expansion valve (16) in return circuit with evaporimeter (6), compressor (14) and condenser (18) all are connected with cross valve (15), are provided with the radiator on condenser (18), reheat condenser (7) are parallelly connected through pipeline and condenser (18), and reheat condenser (7) are close to and are provided with reheat expansion valve (12) on evaporimeter (6) place pipeline.

2. The single cold heat source fresh air humidity conditioning unit as claimed in claim 1, wherein a main expansion valve (13) is disposed between the evaporator (6) and the condenser (18) and on a side close to the evaporator (6), the main expansion valve (13) is selectively used with an outdoor expansion valve (16), the main expansion valve (13) is connected in parallel with a check valve facing the condenser (18), and the outdoor expansion valve (16) is connected in parallel with a check valve facing the evaporator (6).

3. The single cold heat source fresh air humidity conditioning unit as recited in claim 2, wherein the condenser (18) and the reheat condenser (7) are provided with filters on the side pipelines close to the evaporator (7).

4. The single cold heat source fresh air humidity conditioning unit as recited in claim 1, wherein the air inlet comprises a return air valve (1) communicated with indoor air and a fresh air valve (2) communicated with outdoor air.

5. The single cold heat source fresh air humidity conditioning unit as claimed in claim 1, wherein an ultraviolet lamp (9) is further arranged between the humidifier (8) and the fan (10).

6. The single cold heat source fresh air humidity conditioning unit as recited in claim 1, wherein the fan (10) is a centrifugal fan.

7. The single cold heat source fresh air humidity control unit as claimed in claim 1, wherein the radiator is an axial flow fan (17).

8. The fresh air humidity control unit with a single cold heat source as claimed in claim 1, wherein the filter screen assembly comprises a primary filter (3), a medium-efficiency filter (4) and a high-efficiency filter (5) which are arranged in sequence.

9. The single cold heat source fresh air humidity conditioning unit as claimed in claim 8, wherein the primary filter (3) and the high efficiency filter (5) are provided with air pressure difference switches.

10. The single cold and heat source fresh air humidity conditioning unit as recited in claim 1, further comprising a control system, wherein the control system comprises a controller, and a temperature sensor, a temperature and humidity sensor and a pressure sensor electrically connected with the controller, the temperature sensor is disposed between the evaporator (6) and the reheat condenser (7), the temperature and humidity sensor is disposed on the air inlet and the air outlet (11), the pressure sensor is disposed on the air suction and exhaust pipeline of the compressor (14), and the controller is further electrically connected with the compressor (14), the fan (10) and the radiator.

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