CN114017940B - Integral heat pump heat recovery type fresh air dehumidifier and control method thereof - Google Patents

Abstract

The invention relates to an integral heat pump heat recovery type fresh air dehumidifier and a control method thereof, wherein the dehumidifier includes an air flow path and a refrigerant loop, the air flow path includes an exhaust air duct and an air supply air duct, and the exhaust air Both ends of the air duct are provided with a return air outlet and an air exhaust air outlet, and both ends of the air supply air duct are provided with an air supply air outlet and an air inlet air outlet. There is an inclined air mixing damper that can connect the two; the refrigerant circuit includes a compressor, a four-way reversing valve, an exhaust coil, a return air coil, a first one-way valve, an air supply coil, The first throttling device, the second throttling device, and the air inlet coil. Compared with the prior art, the present invention can not only deeply dehumidify the air while ensuring the outlet air temperature, but also meet the demand for fresh air supply in different seasons so as to cover various working conditions throughout the year, and can also effectively avoid heating and internal heating. The heat absorption of the incoming fresh air by the air supply coil in the circulation mode.

Description

An integral heat pump heat recovery type fresh air dehumidifier and its control method

technical field

The invention relates to a fresh air dehumidifier, in particular to an integral heat pump heat recovery type fresh air dehumidifier and a control method thereof.

Background technique

Heat pump exhaust heat recovery technology uses indoor exhaust air to condense or evaporate the refrigerant in the heat exchanger, thereby completing the recovery of energy in the exhaust air, and has become one of the important means of energy saving in modern buildings. The heat pump heat recovery type fresh air dehumidifier using this technology can not only reduce the energy consumption of the unit compressor, but also avoid the cross infection caused by the traditional exhaust heat recovery method, and improve the indoor air quality while saving energy.

However, with the continuous expansion of fresh air fans in the household market, in order to further standardize product energy efficiency and improve user comfort, the new national standard puts forward higher requirements for filtration, cooling (heating) and dehumidification of household fresh air dehumidifiers. , which undoubtedly brings more challenges to the design of the new fan.

The Chinese patent application number 201810585463.7 proposes an integral heat pump heat recovery type fresh air dehumidifier with an internal circulation mode, which can realize three modes of internal circulation, cooling and dehumidification and heating through control design. However, the dehumidification conditions in summer are not carefully distinguished, and there is a lack of response modes under different loads. At the same time, because the fresh air is directly sent into the room after being cooled and dehumidified by the evaporator, the temperature of the air supply in summer is low, and it is difficult to meet the requirements of the new national standard. The temperature is not lower than the standard of 22 ℃, and the user comfort is not good.

In this regard, the Chinese Patent Application No. 202011216770.1 proposes a full-working heat pump heat recovery type new fan with multiple reheating methods, which has multiple reheating methods such as subcooling reheating, condensing reheating, and semi-condensing reheating. , which can be selected by the unit under different loads in the dehumidification mode, which can ensure that the outlet air temperature is higher than the set value. The setting of the reheating coil and variable reheating method in this patent effectively guarantees the outlet air temperature in the dehumidification mode, but in the heating mode, the presence of the reheating coil will actually cool down the heated air, causing Unnecessary heat loss. In the heating mode, the reheating coil management should continue to heat up the air after the air supply coil comes out (similar to the cooling and dehumidification mode), but the actual temperature of the refrigerant in the reheating coil is already lower than the temperature of the inlet air at this time, which makes the air flow. The passing air cooled down.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a kind of integral heat pump heat recovery type fresh air dehumidifier and its control method in order to overcome the above-mentioned defects of the prior art, which can not only dehumidify the air deeply while ensuring the outlet air temperature, but also satisfy the The supply demand of fresh air in different seasons can cover various working conditions throughout the year, and it can also effectively avoid the heat absorption of the incoming fresh air by the air supply coil in the heating and internal circulation modes.

The applicant found that the root cause of the problem in Chinese Patent 202011216770.1 is that when the two modes of cooling and dehumidification and heating are switched, the refrigerant flow path is reversed and switched, while the air flow direction remains unchanged. The specific performance is as follows: in the summer cooling and dehumidification mode, the coil is used as an evaporator, and the refrigerant and air need to adopt a co-flow heat exchange arrangement to avoid the evaporation temperature being lowered and improve energy efficiency; but in the heating mode, with the refrigerant When the flow path is reversed and switched, the coil acts as a condenser, and the refrigerant and air become a countercurrent heat exchange arrangement. This results in that although the coil heats the air to a higher temperature of over 30°C, the refrigerant at the outlet has been cooled to around 16°C by the inlet air (see Figure 1(a)). Furthermore, the temperature of the refrigerant entering the reheat coil (about 16°C) is lower than the air temperature (over 30°C), resulting in heat loss of the supply air being heated by the supply air coil and then cooled by the reheat coil.

In the present invention, a bypass pipeline is added in parallel with the air supply coil, and the refrigerant flowing out from the air inlet coil in the heating and internal circulation modes does not flow through the air supply coil, which effectively avoids the heat loss in the air supply. loss (see Figure 1(b)). At the same time, the present invention makes the design of the product more compact and takes up less space by changing the arrangement of the corresponding internal components.

The first object of the present invention is to protect an integral heat pump heat recovery type fresh air dehumidifier, including an air flow path and a refrigerant loop, the air flow path including an exhaust air duct and a supply air duct, the exhaust air Both ends of the air duct are provided with a return air outlet and an air outlet, and both ends of the air supply air duct are provided with an air supply air outlet and an air inlet air outlet. The two connected inclined air mixing dampers;

The refrigerant loop includes a compressor, a four-way reversing valve, an exhaust coil, a return air coil, a first check valve, an air supply coil, a first throttling device, and a second throttling device connected in sequence. device, air inlet coil.

Further, the refrigerant loop is also provided with a first bypass circuit;

The first bypass circuit is provided with a cut-off valve, one end of the cut-off valve is connected to the connecting pipe between the exhaust port of the compressor and the four-way reversing valve, and the other end of the cut-off valve is connected to the first bypass valve. On the connecting pipe between the outlet of a one-way valve and the air supply coil.

Further, the refrigerant loop is also provided with a second bypass circuit;

The second bypass circuit is provided with a second one-way valve, and the second one-way valve is connected in parallel with the first one-way valve, the air supply coil and the first throttling device;

One end of the second one-way valve is connected to the connecting pipe between the return air coil and the first one-way valve, and the other end is connected to the connecting pipe between the first throttling device and the second throttling device.

Further, an exhaust side water pan is provided in the exhaust air duct;

The air exhaust coil and the return air coil are respectively inclined at a certain angle in the water pan on the exhaust side.

Further, the first one-way valve, the air supply coil, the first throttle device, the second throttle device, the air inlet coil, the first bypass circuit and the stop valve on it, the second bypass circuit The second one-way valve, the four-way reversing valve and the compressor on it are arranged in the air supply air duct.

Further, the air supply air duct is provided with an air supply side water pan, and the air supply coil and the air inlet coil are arranged in the air supply side water pan;

A connection port for connecting the two is provided between the air exhaust side water pan and the air supply side water pan, and a drain port is provided on the air exhaust side water pan.

Further, the four ports of the four-way reversing valve are respectively connected with the exhaust coil, the suction port of the compressor, the intake coil and the exhaust port of the compressor.

Further, the conduction direction of the first one-way valve is consistent with the refrigerant flow direction in the dehumidification mode, that is, the refrigerant is allowed to flow into the air supply coil from the return air coil, and the reverse is blocked;

The conduction direction of the second one-way valve is consistent with the refrigerant flow direction in the heating mode and the internal circulation mode, that is, the refrigerant is allowed to pass through the connection between the first throttling device and the second throttling device The pipe flows to the return air coil, and the reverse is cut off.

Further, the return air outlet and the air supply air outlet are respectively provided with a return air air sensor and a supply air temperature and humidity sensor. Among them, the return air sensor can detect the temperature, humidity and CO ₂ concentration in the return air, and the supply air temperature and humidity sensor can detect the temperature and humidity in the supply air.

Further, the exhaust air outlet of the exhaust air duct is provided with an exhaust fan;

In the air supply air duct, an air supply fan is provided at the inclined air mixing door.

Further, a humidifier is provided between the air supply coil and the air supply port, and the humidifier can be selected from a wet film humidifier, an electrode humidifier, an electric heating humidifier and an ultrasonic humidifier, which are used for the heating mode. The supply air that meets the humidity requirements is humidified.

Further, an air filter is provided in front of the air inlet coil, the air filter is reserved with a repair port, and the repair port is arranged on the side or the bottom.

The first throttling device and the second throttling device in this technical solution are one of a capillary tube, a throttling short tube or an electronic expansion valve. In order to facilitate automatic control, an electronic expansion valve is preferred in this technical solution.

The cut-off valve in the technical solution is preferably a solenoid valve, which is suitable for the high temperature and high pressure environment of the compressor exhaust port, and is conducive to the automatic control of the fresh air blower.

In the technical solution, the inclined air mixing damper is a servo-driven damper, and a servo-driven damper is provided on the air outlet and the air inlet.

The second object of the present invention is to protect a control method of the above-mentioned integral heat pump heat recovery type fresh air dehumidifier. According to different loads under refrigeration and dehumidification in summer, through the opening and closing of each damper and the change of the flow path, supercooling and reheating are selected. Or the reheating method of condensation reheating, so that the supply air temperature can reach or be higher than the minimum supply air temperature of 22°C;

By opening the bypass pipeline at the air supply coil, the refrigerant flowing out of the air inlet coil in the heating and internal circulation mode does not flow through the air supply coil, thereby avoiding the loss of heat in the air supply.

Further, in the dehumidification mode, the series-parallel relationship between the exhaust coil, the return air coil and the supply coil is changed by opening and closing the first bypass circuit, thereby adjusting the state of the refrigerant at the inlet of the supply coil, changing the The ratio of condensation reheating and subcooling reheating in the heat exchange between the first bypass circuit and the air can ensure the required air supply temperature under different air intake conditions;

In the heating mode, the high-temperature and high-pressure refrigerant gas is sent into the air supply coil through the first bypass circuit, so that the refrigerant flow paths of the air supply coil and the air inlet coil are connected in parallel, and the air is heated in steps. Improve energy efficiency at the same supply air temperature;

In the heating and internal circulation mode, the air supply coil has the ability to reheat in summer, and at the same time, it is bypassed by the second check valve on the second bypass circuit to avoid the air supply coil in the heating and internal circulation mode. The absorption of heat by the pipe into the fresh air.

Through the opening and closing of the damper and the switching of the flow path, the technical solution can mainly realize the following six operating modes:

1. Dehumidification mode: the return air outlet, exhaust air outlet, air supply air outlet and air inlet air outlet are all open, and the inclined air mixing door is opened. Both the exhaust fan and the supply fan are turned on. In the four-way reversing valve, the exhaust coil is connected with the flow path of the compressor discharge port, and the air inlet coil is connected with the flow path of the compressor suction port. The first one-way valve is in a conducting state, the second one-way valve is in an off state, and the first throttling device is in a fully open state. The shut-off valve is closed. Humidifier not working. In this mode, the second throttling device controls the superheat degree of the system, controls the indoor return air humidity by adjusting the frequency of the compressor, controls the indoor CO 2 concentration by adjusting the air supply volume by the air supply fan, and controls the indoor CO ₂ concentration by adjusting the air supply fan. The size of the return air volume ensures that the system return air volume is always between 80% and 90% of the supply air volume.

2. Dehumidification mode (low environmental conditions): the return air outlet, exhaust air outlet, air supply air outlet and air inlet air outlet are all open, and the inclined air mixing door is closed. Both the exhaust fan and the supply fan are turned on. In the four-way reversing valve, the exhaust coil is connected with the flow path of the compressor discharge port, and the air inlet coil is connected with the flow path of the compressor suction port. The first one-way valve is in an on state, the second one-way valve is in a cut-off state, the first throttling device is in a fully open state, the cut-off valve is open, and the humidifier does not work. In this mode, the control strategies of the second throttling device, the supply fan and the exhaust fan are the same as those in the dehumidification mode. The compressor controls the indoor return air humidity first through frequency adjustment, and when the indoor return air humidity meets the requirements, it turns to control the supply air temperature.

3. Heating mode 1: The return air outlet, exhaust air outlet, supply air outlet and air inlet air outlet are all open, and the inclined air mixing door is closed. Both the exhaust fan and the supply fan are turned on. In the four-way reversing valve, the air inlet coil is communicated with the flow path of the compressor discharge port, and the exhaust coil pipe is communicated with the flow path of the compressor suction port. The first one-way valve is in an off state, and the second one-way valve is in an on state. The shut-off valve is closed. The humidifier starts working. In this mode, the control strategies of the second throttling device, the supply fan and the exhaust fan are the same as those in the dehumidification mode. The temperature of the supply air is controlled by the frequency adjustment of the compressor, and the humidity of the return air is controlled by adjusting the flow rate of its own water supply through the humidifier.

4. Heating mode 2: The status of the air outlet, damper, fan, four-way reversing valve, one-way valve and humidifier is the same as that of heating mode 1. The shut-off valve opens. In this mode, the first throttling device controls the flow ratio of the refrigerant in the air supply coil flow path and the air inlet coil flow path, and the second throttling device, the air supply fan, the exhaust fan, the compressor and the humidifier The control strategy is the same as in heating mode 1.

5. Internal circulation mode: the exhaust air outlet and the air inlet air outlet are closed, the return air outlet and the air supply air outlet are opened, and the middle inclined air mixing door is opened. The exhaust fan is turned off and the supply fan is turned on. In the four-way reversing valve, the air inlet coil is communicated with the flow path of the compressor discharge port, and the exhaust coil pipe is communicated with the flow path of the compressor suction port. The first one-way valve is in an off state, and the second one-way valve is in an on state. The shut-off valve is closed. Humidifier not working. In this mode, the second throttling device controls the superheat degree of the system, and controls the indoor return air humidity by adjusting the frequency of the compressor. The blower fan keeps running at a constant speed.

6. Internal circulation mode with fresh air: the air inlet is closed, the return air outlet, exhaust air outlet and air supply air outlet are opened, and the inclined air mixing door is opened. The exhaust fan is turned off and the supply fan is turned on. In the four-way reversing valve, the air inlet coil is communicated with the flow path of the compressor discharge port, and the exhaust coil pipe is communicated with the flow path of the compressor suction port. The first one-way valve is in an off state, and the second one-way valve is in an on state. The shut-off valve is closed. Humidifier is off. In this mode, the control strategy of the second throttling device and the compressor is the same as that in the internal circulation mode, and the air supply fan controls the indoor CO ₂ concentration by adjusting the air supply volume.

In this technical solution, an integral heat pump heat recovery type fresh air dehumidifier and its control method are provided. The refrigerant is sucked into the compressor suction port and compressed into high temperature and high pressure refrigerant gas. The refrigerant passes through the four-way reversing valve, condenses and releases heat in the exhaust coil, and is further subcooled in the return air coil and supply air coil. , after the first throttling device and the second throttling device throttle into a gas-liquid two-phase state, and return to the air inlet coil. The outdoor fresh air enters the supply air duct from the air inlet, taking away part of the heat emitted by the compressor. After that, the fresh air is divided into two parts: one part enters the exhaust air duct through the inclined air mixing damper; the other part continues in the supply air duct. It is filtered by the air filter, and then cooled and dehumidified by the air inlet coil and reheated by the air supply coil, and then enters the room from the air supply air outlet. The indoor return air enters the exhaust air duct from the return air outlet, first absorbs heat through the return air coil, then mixes with part of the fresh air entering the exhaust air duct and flows through the exhaust coil to absorb heat, and finally passes through the exhaust fan. Exhaust from the exhaust vents. In this mode, the second throttling device controls the superheat degree of the system. When the system superheat degree is low, the opening degree of the second throttling device decreases, otherwise the opening degree increases. The compressor controls the indoor return air humidity through frequency adjustment. When the indoor return air humidity is greater than the set value, the compressor frequency increases, and when the indoor return air humidity is lower than the set value, the compressor frequency is reduced. frequency. The air supply fan controls the indoor CO ₂ concentration by adjusting the air supply volume. When the indoor CO ₂ concentration is high, the speed of the air supply fan increases, the air supply volume increases, and vice versa. The exhaust fan controls the return air volume of the system by adjusting the rotation speed. When the supply air volume of the supply fan increases, the exhaust fan increases the return air volume by increasing the rotation speed. When the supply air volume of the supply fan decreases, the exhaust fan You need to reduce the speed to reduce the return air volume. In this way, it is ensured that the system return air volume is always between 80% and 90% of the supply air volume.

In this technical solution, an integral heat pump heat recovery type fresh air dehumidifier and a control method thereof, in the dehumidification mode (low environmental condition), the refrigerant in the air inlet coil evaporates and absorbs heat and turns into refrigerant gas, The high-temperature and high-pressure gas refrigerant at the outlet of the compressor is divided into two parts: one part flows to the air supply coil through the stop valve, and the other part passes through the four-way reversing valve. Flow to the supply air coil. The two parts of the refrigerant are combined in the inlet pipeline of the air supply coil, condensed or further subcooled in the air supply coil, and are throttled by the first throttling device and the second throttling device together to become gas-liquid two. Phase status, return to the air inlet coil. The outdoor fresh air enters the air supply duct from the air inlet. After taking away part of the heat emitted by the compressor, it is filtered by the air filter, and then cooled and dehumidified by the air inlet coil and reheated by the air supply coil. The air vent enters the room. The indoor return air enters the exhaust air duct from the return air outlet, first absorbs heat through the return air coil and the exhaust coil, and then is exhausted from the exhaust air outlet through the exhaust fan. In this mode, the control methods of the second throttling device, the supply fan and the exhaust fan are the same as those in the dehumidification mode. The compressor controls the indoor return air humidity preferentially through frequency adjustment. When the indoor return air humidity is greater than the set value, the compressor frequency increases, and when the indoor return air humidity is lower than the set value, the compressor is reduced. Frequency of. When the indoor return air humidity meets the requirements, the compressor turns to control the supply air temperature. When the supply air temperature is low, the compressor frequency increases, and when the supply air temperature is high, the compressor frequency is reduced.

In this technical solution, an integral heat pump heat recovery type fresh air dehumidifier and a control method thereof, in heating mode 1, the refrigerant in the return air coil and the exhaust coil evaporates and absorbs heat and turns into refrigerant gas , through the four-way reversing valve, it is sucked into the compressor suction port and compressed into high-temperature and high-pressure refrigerant gas, and then through the four-way reversing valve, it condenses and releases heat in the air inlet coil, and is throttled through the second throttling device. It becomes a gas-liquid two-phase state, and returns to the return air coil through the second one-way valve. The outdoor fresh air enters the air supply duct from the air inlet, first takes away part of the heat emitted by the compressor, then filters it by the air filter, heats it through the air inlet coil, and finally is humidified by the humidifier and sent into the room. The indoor return air enters the exhaust air duct from the return air outlet, and after cooling down through the return air coil and the exhaust coil, it is discharged from the exhaust air outlet through the exhaust fan. In this mode, the control methods of the second throttling device, the supply fan and the exhaust fan are the same as those in the dehumidification mode. The compressor controls the supply air temperature through frequency regulation. When the supply air temperature is low, the compressor frequency increases, and when the supply air temperature is high, the compressor frequency is reduced. The humidifier controls the return air humidity by adjusting the water flow of its own water supply. When the return air humidity is greater than the set value, the humidifier reduces the water supply water flow, and increases when the return air humidity is lower than the set value. The flow rate of the supply water in the humidifier.

In this technical solution, an integral heat pump heat recovery type fresh air dehumidifier and a control method thereof, in heating mode 2, the refrigerant in the return air coil and the exhaust coil evaporates and absorbs heat and turns into refrigerant gas , through the four-way reversing valve, is sucked into the compressor suction port and compressed into high temperature and high pressure refrigerant gas, and then divided into two parts: one part flows into the air supply coil through the solenoid valve for condensation and heat release, and in the first section The other part condenses and releases heat in the air inlet coil through the four-way reversing valve, and is throttled through the second throttling device. The gas-liquid two-phase refrigerant throttled by the first throttling device and the second throttling device respectively returns to the air return coil through the second one-way valve. The outdoor fresh air enters the air supply duct from the air inlet, first takes away part of the heat emitted by the compressor, and then filters it by the air filter. After being heated by the air inlet coil and the air supply coil, the humidifier finally After humidifying, send it indoors. The indoor return air enters the exhaust air duct from the return air outlet, and after cooling down through the return air coil and the exhaust coil, it is discharged from the exhaust air outlet through the exhaust fan. In this mode, the control methods of the second throttling device, the air supply fan, the exhaust fan, the compressor and the humidifier are all the same as in the heating mode 1. On the premise that the second throttling device controls the degree of superheat, the first throttling device controls the flow ratio of the refrigerant in the air supply coil and the air inlet coil. The opening degree of the throttling device, when the flow rate in the air supply coil is too large, the opening degree of the first throttling device is reduced.

In this technical solution, an integral heat pump heat recovery type fresh air dehumidifier and a control method thereof, in the internal circulation mode, the refrigerant in the return air coil evaporates and absorbs heat into refrigerant gas, which passes through the exhaust coil. , Four-way reversing valve, sucked by the compressor suction port and compressed into high temperature and high pressure refrigerant gas, through the four-way reversing valve, condensing and releasing heat in the air inlet coil, and throttling through the second throttling device to become The gas-liquid two-phase state is returned to the return air coil through the second one-way valve. The indoor return air enters the exhaust air duct from the return air outlet, passes through the return air coil for cooling and dehumidification, and enters the supply air duct through the inclined air mixing damper. Enter the room through the air outlet. In this mode, the control method of the second throttling device and the compressor is the same as that in the dehumidification mode. The blower fan keeps running at a constant speed.

In this technical solution, an integral heat pump heat recovery type fresh air dehumidifier and its control method are provided. Under the internal circulation mode with fresh air, the refrigerant in the return air coil and the exhaust coil evaporates and absorbs heat and becomes refrigeration. The refrigerant gas is sucked by the suction port of the compressor through the four-way reversing valve and compressed into high temperature and high pressure refrigerant gas, which is condensed and released in the air inlet coil through the four-way reversing valve, and is throttled through the second throttling device. It becomes a gas-liquid two-phase state, and returns to the return air coil through the second one-way valve. The indoor return air enters the exhaust air duct from the return air outlet, and is cooled and dehumidified by the return air coil. The inclined air mixing damper is mixed into the air supply air duct, filtered by the air filter, and then heated by the air inlet coil, and then enters the room from the air supply air outlet. In this mode, the control methods of the second throttling device, the compressor and the blower are the same as in the dehumidification mode.

The present invention is an integral heat pump heat recovery type fresh air dehumidifier and a control method thereof. The structure has the following features and innovations:

1. There is a first bypass circuit: in the dehumidification mode, the series-parallel relationship between the exhaust coil + return air coil and the air supply coil is changed through the opening and closing of this circuit, and then the refrigerant at the inlet of the air supply coil is adjusted. The required air supply temperature can be guaranteed under different air intake states; in the heating mode, the first bypass can also be used. The circuit sends high-temperature and high-pressure refrigerant gas into the air supply coil, so that the refrigerant flow paths of the air supply coil and the air inlet coil are connected in parallel, and the air is heated in steps to improve energy efficiency at the same air supply temperature.

2. A second bypass circuit is provided, which enables the air supply coil to be bypassed by the second check valve on the second bypass circuit in the heating and internal circulation modes while having reheating capability in summer. Effectively avoid the heat energy loss caused by the absorption of heat in the incoming fresh air by the air supply coil in the heating and internal circulation mode (see Figure 1).

3. The air supply fan is set at the inclined air mixing door in the air supply duct. On the one hand, it can keep positive pressure near the water pan on the air supply side and negative pressure near the water pan on the exhaust side, which is beneficial to the water pan on the exhaust side. The condensed water in the unit flows into the water pan on the air supply side through the connection port, so that the condensed water of the whole unit can be better discharged from the drain port. On the other hand, the air supply fan can reduce the noise of the unit through the shielding of air filters, air inlet coils, air supply coils and humidifiers, and the user experience is better.

4. The unit is newly equipped with an internal circulation mode with fresh air. On the basis of the internal circulation mode in the transition season, the exhaust air door is opened, which can filter and dehumidify the indoor air while introducing fresh air.

5. The setting of the water pan on the exhaust side and the water pan on the supply side is not only conducive to drainage, but also the condensed water in the water pan will cool down the coils placed in it under certain conditions. Condensing temperature, thereby improving the overall performance of the unit.

6. The return air coil and the exhaust coil are respectively placed at a certain angle in the water pan of the exhaust air duct, which reduces the width of the air duct, effectively reduces the overall size of the unit, and makes the overall structure of the unit more compact. compact.

7. Through the control method of related components, the indoor temperature and humidity can be automatically maintained at the set value, and the use of the unit is more efficient and convenient.

The object of the present invention can be realized through the following technical solutions:

Compared with the prior art, the present invention has the following advantages:

1. The air supply coil and the first bypass circuit added in this technical solution are effective in both dehumidification and heating modes. In summer, by controlling the opening and closing of the shut-off valve, it is possible to match the appropriate reheating method to the different loads of the dehumidification conditions in summer, so that the air supply temperature in summer always meets the requirements, especially for the minimum air supply temperature of 22 °C in the new national standard. Require. In the heating mode, the high-temperature refrigerant can also flow into the air supply coil by opening the shut-off valve to reheat the fresh air and improve the energy efficiency of the unit. The setting of the shut-off valve achieves remarkable results with simple components combined with ingenious structural design, which greatly enriches the use scene of the fresh air fan, which is both economical and effective.

2. In this technical solution, a second bypass circuit is set at the air supply coil, and through the unidirectional conduction effect of the first one-way valve and the second one-way valve, the refrigerant does not mix in the heating and internal circulation modes. It does not flow through the air supply coil, which can effectively avoid the loss of heat in the air supply at the air supply coil, which is more suitable for the needs of household fresh air supply throughout the year.

3. In this technical solution, the air supply fan is arranged at the inclined air mixing door in the air supply air duct, which is not only conducive to the overall drainage of the unit, but also reduces the noise of the unit to a certain extent, making the user experience better.

4. In this technical solution, there is a water pan on the exhaust side and a water pan on the supply side, the return air coil and the air exhaust coil are placed obliquely in the water pan on the exhaust side, and the air supply coil and the air supply coil are placed in the water pan on the air supply side. Air inlet coil. The condensed water formed in the water pan on the exhaust side and the water pan on the air supply side can cool the heat exchange device placed in it through the blowing action of the wind when the unit is running, which can reduce the condensing temperature of the unit and improve the overall performance of the unit .

5. The inclined placement of the exhaust coil and the return air coil in this technical solution reduces the size of the unit. At the same time, because there are not too many air valves or air duct steering components in the unit box, the structure is more compact than similar products. for simplicity and compactness.

6. There are many adjustable modes of the unit in this technical solution, and the indoor temperature and humidity can always be kept at the set value through the mutual control of each component, which not only facilitates the use of the user, but also improves the user's comfort.

Description of drawings

Figure 1 is a schematic diagram of the flow direction and temperature change of the refrigerant and air in the air supply coil and the reheat coil in the heating mode of the invention patent 202011216770.1 and the invention patent;

Fig. 2 is the structural representation of the heat pump heat recovery type fresh air dehumidifier in the present invention;

3 to 8 are respectively the dehumidification mode, dehumidification mode (low ambient working condition), heating mode 1, heating mode 2, internal circulation mode, and internal circulation mode with fresh air of the heat pump heat recovery type fresh air dehumidifier in the present invention. Schematic diagram of the process;

FIG. 9 is a schematic diagram of a structural arrangement of the heat pump heat recovery type fresh air dehumidifier in the present invention.

In the figure: 1-exhaust air duct; 2-air supply air duct; 3-return air outlet; 4-exhaust air outlet; 5-air supply air outlet; 6-air inlet air outlet; 7-inclined air mixing door; 8～ 10-air valve; 11-exhaust side water pan; 12-air supply side water pan; 13-return air coil; 14-exhaust coil; 15-first check valve; 16-air supply coil; 17-First throttle device; 18-Second throttle device; 19-Air inlet coil; 20-Air filter; 21-Four-way reversing valve; 22-Compressor; 23-Exhaust fan; Air supply fan; 25-stop valve; 26-second one-way valve; 27-humidifier; 28-return air sensor; 29-supply air temperature and humidity sensor; 30-connection port; 31-drainage port; 32～47 Connecting pipe.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Features such as component models, material names, connection structures, control methods, algorithms, etc., which are not explicitly described in this technical solution, are regarded as common technical features disclosed in the prior art.

Example 1

An integral heat pump heat recovery type fresh air dehumidifier and a control method thereof in this embodiment, its structure is shown in Figure 2, the main structure includes an exhaust air duct 1, a supply air duct 2, a return air outlet 3, an exhaust air duct 2, a Air outlet 4, air supply air outlet 5, air inlet air outlet 6, inclined air mixing door 7, air valve 8-10, exhaust side water pan 11, air supply side water pan 12, return air coil 13, exhaust coil 14. First check valve 15, air supply coil 16, first throttle device 17, second throttle device 18, air inlet coil 19, air filter 20, four-way reversing valve 21, compressor 22 , exhaust fan 23, air supply fan 24, stop valve 25, second one-way valve 26, humidifier 27, return air sensor 28, supply air temperature and humidity sensor 29, connection port 30, drain port 31, connecting pipeline 32 to 47.

In this embodiment, the compressor 22, the connecting pipes 42, 43, the four-way reversing valve 21, the connecting pipe 32, the exhaust coil 14, the connecting pipe 33, the return air coil 13, the connecting pipes 34, 35, the first single Directional valve 15, air supply coil 16, connecting pipe 36, first throttling device 17, connecting pipes 37, 38, second throttling device 18, connecting pipe 39, exhaust coil 19, connecting pipe 40, four-way The reversing valve 21 and the connecting pipes 41 are connected in sequence to form a refrigerant loop. The port A of the four-way reversing valve 21 is connected with the connecting pipe 40 , the port B is connected with the connecting pipe 41 , the port C is connected with the connecting pipe 32 , and the port D is connected with the connecting pipe 43 .

In this embodiment, the refrigerant loop is also provided with first and second bypass circuits. The first bypass circuit is composed of a connecting pipe 44 , a stop valve 25 and a connecting pipe 45 , one end of which is connected to the compressor discharge through the connecting pipe 44 . The gas connecting pipe 42 is connected, and the other end is connected with the pipeline between the first one-way valve 15 and the air supply coil 16 through the connecting pipe 45 . The second bypass circuit is composed of the connecting pipe 46 , the second one-way valve 26 and the connecting pipe 47 , which are connected in parallel with the first one-way valve 15 and the air supply coil 16 , and one end is connected to the inlet of the first one-way valve 15 through the connecting pipe 46 The connecting pipe 35 is communicated, and the other end is communicated with the connecting pipes 37 and 38 between the first throttling device 17 and the second throttling device 18 through the connecting pipe 47 .

The unit can realize the following 6 operating modes through the opening and closing of the damper and the switching of the flow path:

1. Dehumidification mode (see Figure 3)

In the dehumidification mode of the unit in this embodiment, the components are in the following states: the return air outlet 3, the exhaust air outlet 4, the air supply air outlet 5, and the air inlet air outlet 6 are all open, and the inclined air mixing door 7 is open. The exhaust fan 23 and the air supply fan 24 are both turned on. The AB port of the four-way reversing valve 21 is connected, and the CD port is connected. The first one-way valve 15 is in an on state, the second one-way valve 26 is in a cut-off state, the first throttling device 17 is in a fully open state, the cut-off valve 25 is closed, and the humidifier 27 does not work.

In the dehumidification mode of the unit in this embodiment, the state of the refrigerant flow path is as follows: the refrigerant in the air inlet coil 19 evaporates and absorbs heat and turns into refrigerant gas, which is sucked by the suction port of the compressor 22 through the four-way reversing valve 21 and sucked in by the suction port of the compressor 22 . Compressed into high temperature and high pressure refrigerant gas, the refrigerant passes through the four-way reversing valve 21, condenses and releases heat in the exhaust coil 14, and is further subcooled in the return air coil 13 and the air supply coil 16, and passes through the first The throttling device 17 and the second throttling device 18 are throttled into a gas-liquid two-phase state, and return to the air inlet coil 19 .

In the dehumidification mode of the unit in this embodiment, the state of the air flow path is as follows: the outdoor fresh air enters the air supply duct 2 from the air inlet 6 and takes away part of the heat emitted by the compressor 22. After that, the fresh air is divided into two parts: one part passes through the inclined mixing The air damper 7 enters the exhaust air duct 1; part of it continues in the air supply air duct 2, which is first filtered by the air filter 20, and then cooled and dehumidified by the air inlet coil 19 and reheated by the air supply coil 16. Enter the room through the air supply duct 5 . The indoor return air enters the exhaust air duct 1 from the return air outlet 3, first absorbs heat through the return air coil 13, and then mixes with part of the fresh air entering the exhaust air duct 1 and flows through the exhaust coil 14 to absorb heat. Finally, it is exhausted from the exhaust air outlet 4 through the exhaust fan 23 to the outside.

In the dehumidification mode of the unit in this embodiment, the control strategy is: the second throttling device 18 controls the system superheat. When the system superheat is low, the opening of the second throttling device 18 decreases, otherwise the opening increases. The compressor 22 controls the indoor return air humidity through frequency adjustment. When the indoor return air humidity is greater than the set value, the frequency of the compressor 22 increases, and when the indoor return air humidity is lower than the set value, the compression is reduced. machine 22 frequency. The air supply fan 24 controls the indoor CO ₂ concentration by adjusting the air supply volume. When the indoor CO ₂ concentration is high, the rotation speed of the air supply fan 24 increases, the air supply volume increases, and vice versa. The exhaust fan 23 controls the return air volume of the system by adjusting the rotation speed. When the supply air volume of the supply fan 24 increases, the exhaust fan 23 increases the return air volume by increasing the rotation speed. When the supply air volume of the supply fan 24 decreases , the exhaust fan 23 needs to reduce the speed to reduce the return air volume. In this way, it is ensured that the system return air volume is always between 80% and 90% of the supply air volume.

2. Dehumidification mode (low ambient conditions) (see Figure 4)

In the dehumidification mode (low environmental condition) of the unit in this embodiment, the components are in the following states: the air return air outlet 3, the air exhaust air outlet 4, the air supply air outlet 5, and the air inlet air outlet 6 are all open, and the inclined air mixing door 7 is closed. The exhaust fan 23 and the air supply fan 24 are both turned on. The AB port of the four-way reversing valve 21 is connected, and the CD port is connected. The first one-way valve 15 is in an on state, the second one-way valve 26 is in a cut-off state, the first throttling device 17 is in a fully open state, the cut-off valve 25 is open, and the humidifier 27 does not work.

In the dehumidification mode (low environmental condition) of the unit in this embodiment, the state of the refrigerant flow path is: the refrigerant in the air inlet coil 19 evaporates and absorbs heat into refrigerant gas, and the high temperature and high pressure gas refrigerant at the outlet of the compressor 22 It is divided into two parts: one part flows to the air supply coil 16 through the stop valve 25, and the other part flows to the air supply coil through the four-way reversing valve 21. Tube 16. The two parts of the refrigerant are combined in the inlet pipeline of the air supply coil 16, condensed or further subcooled in the air supply coil 16, and are throttled through the first throttling device 17 and the second throttling device 18 together. The gas-liquid two-phase state returns to the air inlet coil 19.

In the dehumidification mode (low environmental condition) of the unit in this embodiment, the state of the air flow path is as follows: the outdoor fresh air enters the air supply duct 2 from the air inlet 6, and after taking away part of the heat emitted by the compressor 22, the air filter 20 is filtered, and then cooled and dehumidified by the air inlet coil 19 and reheated by the air supply coil 16, and then enters the room through the air supply air outlet 5. The indoor return air enters the exhaust air duct 1 from the return air outlet 3 , first absorbs heat through the return air coil 13 and the exhaust coil 14 , and then is exhausted from the exhaust air outlet 4 through the exhaust fan 23 .

In the dehumidification mode (low environmental condition) of the unit in this embodiment, the control strategy is: the control methods of the second throttling device 18 , the air supply fan 24 and the exhaust fan 23 are the same as those in the dehumidification mode. The compressor 22 preferentially controls the indoor return air humidity through frequency adjustment. When the indoor return air humidity is greater than the set value, the compressor 22 frequency increases, and when the indoor return air humidity is lower than the set value, it decreases Compressor 22 frequency. When the indoor return air humidity reaches the requirement, the compressor 22 turns to control the supply air temperature. When the supply air temperature is lower than the dew point temperature corresponding to the indoor return air state (or the minimum supply air temperature specified in the new national standard is 22°C) ), the frequency of the compressor 22 increases, and when the supply air temperature is higher than the dew point temperature corresponding to the indoor return air state (or the minimum supply air temperature 22°C specified in the new national standard), the compressor 22 frequency is reduced.

In the dehumidification mode (low environmental condition) of the unit of this embodiment, the structural features and the beneficial effects of regulation are as follows: in this mode, since the unit is provided with a first bypass circuit, the solenoid valve 25 is opened to adjust the cooling at the inlet of the reheating coil change the ratio of condensation reheat and subcool reheat in the reheat coil (condensation reheat is higher than subcool reheat heat exchange), so that the unit can always meet the outlet air temperature while performing deep dehumidification requirements.

3. Heating mode 1 (see Figure 5)

In the heating mode 1 of the unit of this embodiment, the components are in the following states: the return air outlet 3, the exhaust air outlet 4, the air supply air outlet 5, and the air inlet air outlet 6 are all open, and the inclined air mixing damper 7 is closed. The exhaust fan 23 and the air supply fan 24 are both turned on. The AD port and the BC port of the four-way reversing valve 21 are communicated. The first one-way valve 15 is in the cut-off state, the second one-way valve 26 is in the conducting state, the cut-off valve 25 is closed, and the humidifier 27 starts to work.

In the heating mode 1 of the unit in this embodiment, the state of the refrigerant flow path is as follows: the refrigerant in the return air coil 13 and the exhaust coil 14 evaporates and absorbs heat into refrigerant gas. The refrigerant gas is sucked in by the suction port of the compressor 22 and compressed into high temperature and high pressure refrigerant gas, and then condenses and releases heat in the air inlet coil 19 through the four-way reversing valve 21, and is throttled through the second throttling device 18 to become gas- The liquid two-phase state is returned to the return air coil 13 via the second one-way valve 26 .

In the heating mode 1 of the unit in this embodiment, the state of the air flow path is as follows: the outdoor fresh air enters the air supply duct 2 from the air inlet 6, first takes away part of the heat dissipated by the compressor 22, and then the air filter 20 removes it. It is filtered, heated by the air inlet coil 19, and finally humidified by the humidifier 27 and sent into the room. The indoor return air enters the exhaust air duct 1 from the return air outlet 3, passes through the return air coil 13 and the exhaust coil 14 to cool down, and is discharged to the outside from the exhaust air outlet 4 through the exhaust fan 23.

In the heating mode 1 of the unit in this embodiment, the control strategy is: the control methods of the second throttling device 18 , the air supply fan 24 and the exhaust fan 23 are the same as those in the dehumidification mode. The compressor 22 controls the supply air temperature through frequency adjustment. When the supply air temperature is low, the frequency of the compressor 22 is increased, and when the supply air temperature is high, the compressor 22 frequency is decreased. The humidifier 27 controls the return air humidity by adjusting the water flow of its own water supply. When the return air humidity is greater than the set value, the humidifier 27 reduces the water flow of the water supply, and when the return air humidity is lower than the set value, the humidifier 27 controls the return air humidity. Increase the flow rate of the supply water in the humidifier 27 .

In the heating mode 1 of the unit of this embodiment, the structural features and the beneficial effects of regulation are as follows: in this mode, since the unit is provided with a second bypass circuit at the air supply coil 16, the cut-off of the first check valve 15 and the The conduction effect of the two one-way valves 26 makes the refrigerant not flow through the air supply coil 16 in this mode, which well avoids the refrigerant of lower temperature from sucking the air supply in the air supply coil 16. The heat exchange process can effectively prevent the loss of heat in the supply air at the supply air coil 16 (see FIG. 1 ).

4. Heating mode 2 (see Figure 6)

In the heating mode 2 of the unit in this embodiment, the component states are: the return air outlet 3, the exhaust air outlet 4, the air supply air outlet 5, and the air inlet air outlet 6 are all open, and the inclined air mixing damper 7 is closed. The exhaust fan 23 and the air supply fan 24 are both turned on. The AD port and the BC port of the four-way reversing valve 21 are communicated. The first one-way valve 15 is in an off state, and the second one-way valve 26 is in an on state. The shut-off valve 25 is opened.

In the heating mode 2 of the unit in this embodiment, the state of the refrigerant flow path is as follows: the refrigerant in the return air coil 13 and the exhaust coil 14 evaporates and absorbs heat and turns into refrigerant gas, which passes through the four-way reversing valve 21. It is sucked in by the suction port of the compressor 22 and compressed into high temperature and high pressure refrigerant gas, and then divided into two parts: one part flows into the air supply coil 16 through the solenoid valve 25 for condensation and heat release, and is throttled in the first throttling device 17. The other part condenses and releases heat in the air inlet coil 19 through the four-way reversing valve 21, and is throttled through the second throttling device 18. The gas-liquid two-phase refrigerant throttled by the first throttling device 17 and the second throttling device 18 returns to the air return coil 13 through the second check valve 26 together.

In the heating mode 2 of the unit in this embodiment, the state of the air flow path is as follows: the outdoor fresh air enters the air supply duct 2 from the air inlet 6, first takes away part of the heat dissipated by the compressor 22, and then passes the air filter 20 to the air supply duct 2. After filtering treatment, after being heated by the air inlet coil 19 and the air supply coil 16, it is finally humidified by the humidifier 27 and sent into the room. The indoor return air enters the exhaust air duct 1 from the return air outlet 3, passes through the return air coil 13 and the exhaust coil 14 to cool down, and is discharged to the outside from the exhaust air outlet 4 through the exhaust fan 23.

In the heating mode 2 of the unit in this embodiment, the control strategy is: the control methods of the second throttling device 18 , the air supply fan 24 , the exhaust fan 23 , the compressor 22 and the humidifier 27 are the same as those in the heating mode 1 . On the premise that the second throttling device 18 controls the degree of superheat, the first throttling device 17 controls the flow ratio of the refrigerant in the air supply coil 16 and the air inlet coil 19. When the flow rate in the air supply coil 16 is too small , increase the opening degree of the first throttling device 17 , when the flow rate in the air supply coil 16 is too large, reduce the opening degree of the first throttling device 17 .

In the heating mode 2 of the unit of this embodiment, the structural features and beneficial effects of regulation are as follows: in this mode, the unit opens the shut-off valve 25 on the basis of the heating mode 1, so that the high-temperature refrigerant flows into the air supply through the first bypass circuit in coil 16. While having the advantages of heating mode 1, the condensation heat in the air supply coil 16 is further utilized to reheat the fresh air, which can improve the energy efficiency of the unit.

5. Inner circulation mode (see Figure 7)

In the internal circulation mode of the unit in this embodiment, the component states are: the exhaust air outlet 4 and the air inlet air outlet 6 are closed, the return air outlet 3 and the air supply air outlet 5 are open, and the middle inclined air mixing door 7 is opened. The exhaust fan 23 is turned off, and the air supply fan 24 is turned on. The AD port and the BC port of the four-way reversing valve 21 are communicated. The first one-way valve 15 is in an off state, and the second one-way valve 26 is in an on state. The shut-off valve 25 is closed. The humidifier 27 is turned off.

In the internal circulation mode of the unit in this embodiment, the state of the refrigerant flow path is as follows: the refrigerant in the return air coil 13 evaporates and absorbs heat and turns into refrigerant gas, which is passed through the exhaust coil 14 and the four-way reversing valve 21. The suction port of the compressor 22 sucks in and compresses the refrigerant gas into a high temperature and high pressure refrigerant gas, which condenses and releases heat in the air inlet coil 19 through the four-way reversing valve 21, and is throttled through the second throttling device 18 to become gas-liquid two. In the phase state, it returns to the return air coil 13 via the second one-way valve 26 .

In the internal circulation mode of the unit in this embodiment, the state of the air flow path is as follows: the indoor return air enters the exhaust air duct 1 from the return air outlet 3, passes through the return air coil 13 for cooling and dehumidification, and enters the supply air through the inclined air mixing door 7 2, it is filtered by the air filter 20, and then enters the room through the air supply air outlet 5 after absorbing heat through the air inlet coil 19.

In this embodiment, in the internal circulation mode of the unit, the control strategy is: the control methods of the second throttling device 18 and the compressor 22 are the same as those in the dehumidification mode. The blower fan keeps running at a constant speed.

6. Internal circulation mode with fresh air (see Figure 8)

In this embodiment, in the internal circulation mode with fresh air, the component states are: the air inlet 6 is closed, the return air outlet 3, the exhaust air outlet 4, and the air supply air outlet 5 are open, and the inclined air mixing door 7 is open. The exhaust fan 23 is turned off, and the air supply fan 24 is turned on. The AD port and the BC port of the four-way reversing valve 21 are communicated. The first one-way valve 15 is in an off state, and the second one-way valve 26 is in an on state. The shut-off valve 25 is closed. The humidifier 27 is turned off.

In this embodiment, in the internal circulation mode with fresh air, the refrigerant flow path is as follows: the refrigerant in the return air coil 13 and the exhaust coil 14 evaporates and absorbs heat into refrigerant gas, which passes through the four-way reversing valve. 21 is sucked in by the suction port of the compressor 22 and compressed into high-temperature and high-pressure refrigerant gas, and then passes through the four-way reversing valve 21, condenses and releases heat in the air inlet coil 19, and is throttled through the second throttling device 18 into gas. - Liquid two-phase state, returning to the return air coil 13 via the second one-way valve 26 .

In this embodiment, in the internal circulation mode with fresh air, the state of the air flow path is as follows: the indoor return air enters the exhaust air duct 1 from the return air outlet 3, passes through the return air coil 13 for cooling and dehumidification, and at the same time, the exhaust air duct 1 A small amount of outdoor fresh air enters through the exhaust air outlet 4, and heat is released through the exhaust coil 14. The indoor return air and the outdoor fresh air are mixed into the air supply duct 2 through the inclined air mixing damper 7, and are filtered by the air filter 20. After being heated by the air inlet coil 19, it enters the room through the air supply air outlet 5.

In this embodiment, in the internal circulation mode with fresh air, the control strategy is: the control methods of the second throttling device 18 , the compressor 22 and the air blower 24 are the same as those in the dehumidification mode.

In the internal circulation mode with fresh air, the structural features and beneficial effects of regulation and control of the unit of this embodiment are: in this mode, on the basis of the internal circulation mode of the unit, the exhaust air outlet 4 is opened, which can filter and dehumidify the indoor air. At the same time, the introduction of new wind, the user experience is better.

Refer to FIG. 9 for a structural arrangement of this embodiment. The compact design occupies less space and is very convenient for installation. It should be stated that other arrangements based on the principles of the present invention also belong to the protection scope of the present invention.

Terms such as "first" and "second" are used herein to define components, and those skilled in the art should know that the use of words such as "first" and "second" is only for the convenience of distinguishing components in description. Unless otherwise stated, the above terms have no special meaning.

The foregoing description of the embodiments is provided to facilitate understanding and use of the invention by those of ordinary skill in the art. It will be apparent to those skilled in the art that various modifications to these embodiments can be readily made, and the generic principles described herein can be applied to other embodiments without inventive step. Therefore, the present invention is not limited to the above-mentioned embodiments, and improvements and modifications made by those skilled in the art according to the disclosure of the present invention without departing from the scope of the present invention should all fall within the protection scope of the present invention.

Claims (9)

1. An integral heat pump heat recovery type fresh air dehumidifier, comprising an air flow path and a refrigerant loop, the air flow path includes an exhaust air duct and a supply air duct, and both ends of the exhaust air duct are provided with A return air outlet and an air exhaust air outlet, the two ends of the air supply air duct are provided with an air supply air outlet and an air inlet air outlet, and it is characterized in that the air exhaust air duct and the air supply air duct are provided with a connection between the two. the inclined mixing air door; The refrigerant loop includes a compressor, a four-way reversing valve, an exhaust coil, a return air coil, a first check valve, an air supply coil, a first throttling device, and a second throttling device connected in sequence. device, air inlet coil; A first bypass circuit is also provided in the refrigerant loop; The first bypass circuit is provided with a cut-off valve, one end of the cut-off valve is connected to the connecting pipe between the exhaust port of the compressor and the four-way reversing valve, and the other end of the cut-off valve is connected to the first bypass valve. On the connecting pipe between the outlet of a one-way valve and the air supply coil. 2. A kind of integral heat pump heat recovery type fresh air dehumidifier according to claim 1, characterized in that, the refrigerant loop is also provided with a second bypass circuit; The second bypass circuit is provided with a second one-way valve, and the second one-way valve is connected in parallel with the first one-way valve, the air supply coil and the first throttling device; One end of the second one-way valve is connected to the connecting pipe between the return air coil and the first one-way valve, and the other end is connected to the connecting pipe between the first throttling device and the second throttling device. 3. An integral heat pump heat recovery type fresh air dehumidifier according to claim 1, characterized in that, an exhaust side water pan is provided in the exhaust air duct; The air exhaust coil and the return air coil are respectively inclined at a certain angle in the water pan on the exhaust side. 4. An integral heat pump heat recovery type fresh air dehumidifier according to claim 1, wherein the first check valve, the air supply coil, the first throttling device, the second throttling device, The air inlet coil, the first bypass circuit and the stop valve thereon, the second bypass circuit and the second one-way valve thereon, the four-way reversing valve and the compressor are arranged in the air supply air duct. 5 . The integrated heat pump heat recovery type fresh air dehumidifier according to claim 4 , wherein the air supply air duct is provided with an air supply side water pan, and the air supply coil and the air inlet coil are 5. 6 . Set in the water pan on the air supply side; A connection port for connecting the two is provided between the air exhaust side water pan and the air supply side water pan, and a drain port is provided on the air exhaust side water pan. 6. An integral heat pump heat recovery type fresh air dehumidifier according to claim 1, wherein the four ports of the four-way reversing valve are respectively connected with the air exhaust coil, the suction port of the compressor, The air inlet coil is connected to the exhaust port of the compressor. 7 . The integrated heat pump heat recovery type fresh air dehumidifier according to claim 2 , wherein the conduction direction of the first one-way valve is consistent with the flow direction of the refrigerant in the dehumidification mode, that is, the refrigerant is allowed to pass through the dehumidification mode. 8 . The return air coil flows into the air supply coil, and the reverse is cut off; The conduction direction of the second one-way valve is consistent with the refrigerant flow direction in the heating mode and the internal circulation mode, that is, the refrigerant is allowed to pass through the connection between the first throttling device and the second throttling device The pipe flows to the return air coil, and the reverse is cut off. 8. A control method for the integrated heat pump heat recovery type fresh air dehumidifier according to any one of claims 1 to 7, characterized in that, according to different loads under refrigeration and dehumidification in summer, the opening and closing of each damper and the flow path Change, use the reheating method of subcooling reheating or condensation reheating, so that the supply air temperature can reach or be higher than the minimum supply air temperature 22 ^o C; By opening the bypass pipeline at the air supply coil, the refrigerant flowing out of the air inlet coil in the heating and internal circulation mode does not flow through the air supply coil, thus avoiding the loss of heat in the air supply. 9 . The control method of an integral heat pump heat recovery type fresh air dehumidifier according to claim 8 , wherein in the dehumidification mode, the exhaust coil and the return air are changed by opening and closing the first bypass circuit. 10 . The series-parallel relationship between the coil and the air supply coil can further adjust the state of the refrigerant at the inlet of the air supply coil, and change the ratio of condensation reheating and subcooling reheating in the heat exchange between the first bypass circuit and the air. The required air supply temperature can be guaranteed under the wind condition; In the heating mode, the high-temperature and high-pressure refrigerant gas is sent into the air supply coil through the first bypass circuit, so that the refrigerant flow paths of the air supply coil and the air inlet coil are connected in parallel, and the air is heated in steps. Improve energy efficiency at the same supply air temperature; In the heating and internal circulation mode, the air supply coil has the ability to reheat in summer, and at the same time, through the bypass function of the second check valve on the second bypass circuit, the air supply coil in the heating and internal circulation mode is avoided. The absorption of heat by the tube into the fresh air.

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