Air conditioning system and control method thereof

Abstract

The invention provides an air conditioning system and a control method thereof. The air conditioning system comprises an evaporator, and a water pan is arranged below the evaporator; the air conditioning system further comprises a fresh air pipeline, the air inlet end of the fresh air pipeline is arranged outdoors, and a fresh air valve is arranged at the air inlet end of the fresh air pipeline. A heat exchanger is arranged in the fresh air pipeline, an inlet of the heat exchanger is communicated with an inner cavity of the water pan through a water inlet pipeline, an outlet of the heat exchanger is communicated with the inner cavity of the water pan through a circulating pipeline, and a circulating pump is arranged on the circulating pipeline so that energy consumption during fresh air cooling can be reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioning, and in particular relates to an air conditioning system and a control method thereof. Background Art

[0002] In order to ensure that fruits and vegetables can be stored for a long time after picking and keep them fresh for a long time, people usually store fruits and vegetables in fresh-keeping cold storage to prevent them from spoiling. The temperature, humidity and fresh air control of the fresh-keeping cold storage are crucial to the storage of fruits and vegetables. Too high temperature will accelerate the respiration of fruits and vegetables, and accelerate the growth and deterioration of fruits and vegetables. Too low humidity will increase the dryness of fruits and vegetables, and cause wrinkled skins. Too high concentrations of gases such as carbon dioxide and ethylene in the cold storage will also accelerate the deterioration of fruits and vegetables.

[0003] In the prior art, there are two main ways to control the humidity in the warehouse. One is to directly draw water from outside the warehouse. The water temperature outside the warehouse is higher than the temperature inside the warehouse, and the specific heat capacity of water is large, which easily causes the warehouse temperature to fluctuate and affects the preservation effect.

[0004] In the prior art, in order to lower the temperature of fresh air, the fresh air is cooled by an evaporator before entering the warehouse. Although this method can reduce the fluctuation of warehouse temperature, it will increase the load of the unit, reduce the energy efficiency of the unit, and increase the cost of use.

[0005] How to reduce the energy consumption during fresh air cooling is a technical problem that needs to be solved urgently. Summary of the invention

[0006] Therefore, in order to reduce the energy consumption during fresh air cooling, the present invention provides an air conditioning system and a control method thereof.

[0007] On the one hand, the present invention provides an air conditioning system, including an evaporator, with a water receiving pan arranged below the evaporator; the air conditioning system also includes a fresh air duct, the air inlet end of the fresh air duct is arranged outdoors, and the air inlet end of the fresh air duct is provided with a fresh air valve; a heat exchanger is arranged in the fresh air duct, the inlet of the heat exchanger is connected with the inner cavity of the water receiving pan through a water inlet pipe, and the outlet of the heat exchanger leads to the inner cavity of the water receiving pan through a circulation pipe, and a circulation pump is arranged on the circulation pipe.

[0008] In some embodiments, a water collecting pan is provided below the heat exchanger, and a humidifying element is provided in the fresh air duct; in the flow direction of the fresh air in the fresh air duct, the humidifying element is provided downstream of the heat exchanger, the humidifying element is connected to the inner cavity of the water collecting pan via the humidifying duct, and a humidifying pump is provided on the humidifying duct.

[0009] In some embodiments, the humidifying element is a wet film humidifier, and the humidifying element is disposed above the water collecting tray.

[0010] In some embodiments, the air conditioning system includes a water supply pipe, which is connected to the humidification pipe via a water supply three-way valve, and the water supply three-way valve is arranged on the humidification pipe between the humidification pump and the water collecting tray; a humidification valve is arranged on the humidification pipe between the water supply three-way valve and the water collecting tray, and a water supply valve is arranged on the water supply pipe.

[0011] In some embodiments, a heat exchange portion is provided between the water replenishment three-way valve and the inlet of the water replenishment pipeline, and the heat exchange portion is provided in the water receiving tray.

[0012] In some embodiments, a water outlet pipe is provided on the water collecting tray, and the water outlet pipe is connected with the circulation pipe via a water outlet three-way valve; and a water outlet valve is provided on the water outlet pipe.

[0013] In some embodiments, a drainage three-way valve is provided on the circulation pipeline between the water outlet three-way valve and the circulation pump, a drainage pipeline is provided on the drainage three-way valve, and a drainage valve is provided on the drainage pipeline.

[0014] In some embodiments, the water collecting tray is arranged outside the fresh air duct, the upper end opening of the water collecting tray is sealedly connected to the outer wall surface of the fresh air duct, and a water permeable hole is provided on the fresh air duct, and the water permeable hole connects the inner hole of the fresh air duct and the inner cavity of the water collecting tray.

[0015] In some embodiments, a return air outlet is provided on the indoor fresh air duct, the return air outlet is provided upstream of the heat exchanger, and the return air outlet is provided with a return air valve.

[0016] In some embodiments, an air collecting pipe is disposed in the water receiving tray, and the air collecting pipe is connected to the evaporator.

[0017] In some embodiments, the air conditioning system also includes an air supply box arranged indoors, the air supply box is provided with an air inlet and an air outlet, and the evaporator is arranged between the air inlet and the air outlet; the air outlet is provided with an air supply fan, and the outlet of the fresh air duct is arranged on the air supply box and is located between the evaporator and the air supply fan.

[0018] On the other hand, the present invention also provides a control method for an air conditioning system, wherein the air conditioning system is the above-mentioned air conditioning system, and the control method includes a fresh air heat exchange method, wherein the fresh air heat exchange method includes: controlling the fresh air valve to open, and controlling the circulation pump to open.

[0019] In some embodiments, when a water collecting tray, a humidifying element, a humidifying pipe and a humidifying pump are provided, the control method includes a fresh air humidification method, and the fresh air humidification method includes: controlling the fresh air valve to open, controlling the circulating pump to open, and controlling the humidification pump to open with a first range of power.

[0020] In some embodiments, when a water collecting tray, a humidifying element, a humidifying pipe and a humidifying pump are provided, the control method includes a fresh air moisturizing method, and the fresh air moisturizing method includes: controlling the fresh air valve to open, controlling the circulating pump to open, and controlling the humidifying pump to open at a second range of power.

[0021] In some embodiments, when a return air valve, a water collection tray, a humidification element, a humidification pipe and a humidification pump are provided, the control method includes a return air humidification method, and the return air humidification method includes: controlling the fresh air valve to close, controlling the return air valve to open, and controlling the humidification pump to open.

[0022] In some embodiments, a first water level sensor is provided in the water receiving tray. When a drain valve, a drain pipe and a circulation valve are provided, the control method includes a water receiving tray water level control method. The water receiving tray water level control method includes: when the water level H0 in the water receiving tray is higher than the first preset water level H1, controlling the circulation pump to close, controlling the water outlet valve to close, and controlling the drain valve to open.

[0023] In some embodiments, when a water collecting tray is provided, a second water level sensor is provided in the water collecting tray, and when a water outlet valve, a water replenishment valve, a humidification pump and a humidification valve are provided, the control method includes a water collecting tray water level control method, and the water collecting tray water level control method includes: detecting the water level H in the water collecting tray, and when H>h1 and H0

[0024] In some embodiments, when H≤h1, it is further determined whether the room needs to be humidified. When the room needs to be humidified, the room is humidified, including:

[0025] When h2≤H≤h1 and the room needs to be humidified, the humidification pump and the humidification valve are controlled to be turned on, and the water supply valve, the water outlet valve and the circulation pump are controlled to be turned off;

[0026] When H<h2 and the room needs to be humidified, the humidification pump and the water replenishment valve are controlled to be opened, and the water replenishment valve 701, the humidification valve and the circulation pump are controlled to be closed.

[0027] ​19. The control method according to claim 17 is characterized in that the water level control method of the water collecting pan further comprises: when H>h1 and H0≥H1, controlling the water outlet valve and the drain valve to be opened, controlling the water replenishment valve, the humidification valve and the humidification pump to be closed, and controlling the circulation pump to be opened or closed.

[0028] When fresh air needs to be delivered to the room, the fresh air valve is opened, and outdoor air enters the fresh air duct; the condensed water condensed on the surface of the evaporator collected in the water receiving tray flows into the heat exchanger, and the condensed water circulates through the heat exchanger under the action of the circulation pump; because the heat exchanger is arranged in the fresh air duct, the outdoor fresh air exchanges heat with the condensed water in the heat exchanger when flowing through the heat exchanger, and the cooled fresh air enters the room. In this way, the condensed water generated by the evaporator cools the fresh air, avoiding large fluctuations in indoor temperature due to the introduction of fresh air, which not only recovers the coldness of the condensed water, but also ensures the stability of the indoor temperature. By setting a circulation pump, the condensed water generated by the evaporator collected in the water receiving tray can circulate through the heat exchanger, continuously cooling the fresh air in the fresh air duct, increasing the circulation speed of the condensed water in the water receiving tray, and also improving the cooling efficiency of the fresh air. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0030] Figure 1 is a schematic diagram of an air conditioning system according to an embodiment of the present invention;

[0031] Figure 2 1 is a schematic diagram of the structure of a heat exchanger according to an embodiment of the present invention;

[0032] Figure 3 is a schematic diagram of an air collecting pipe in an embodiment of the present invention when it is in a water receiving tray;

[0033] Figure 4 is a schematic structural diagram of a water collecting tray according to an embodiment of the present invention;

[0034] Figure 5 is a flow chart of indoor air conditioning control according to an embodiment of the present invention;

[0035] Figure 6 is a flow chart of water level control in a water collecting tray according to an embodiment of the present invention;

[0036] The accompanying drawings are marked as follows:

[0037] 1. Fresh air duct; 101. Fresh air valve; 102. Filter device; 201. Heat exchanger; 202. Humidifier; 203. Evaporator; 204. Air box; 205. Air blower; 206. Air inlet; 207. Air outlet; 208. Air collecting pipe; 3. Water collecting pan; 401. Circulation duct; 402. Circulation pump; 5. Water collecting pan; 501. Humidification duct; 502. Humidification pump; 503. Humidification valve; 6. Water supply duct; 601. Water supply valve; 602. Water supply three-way valve; 603. Heat exchange part; 7. Water outlet duct; 701. Water outlet valve; 702. Water outlet three-way valve; 8. Drainage duct; 801. Drainage valve; 802. Drainage three-way valve; 9. Return air duct; 901. Return air valve; 902. Return air outlet. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0040] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0041] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0042] See also Figure 1-4 As shown, the air conditioning system includes an evaporator 203, and a water receiving pan 3 is arranged below the evaporator 203; the air conditioning system also includes a fresh air duct 1, the air inlet end of the fresh air duct 1 is arranged outdoors, and the air inlet end of the fresh air duct 1 is provided with a fresh air valve 101; a heat exchanger 201 is arranged in the fresh air duct 1, and the inlet of the heat exchanger 201 is connected with the inner cavity of the water receiving pan 3 through a water inlet pipe, and the outlet of the heat exchanger 201 leads to the inner cavity of the water receiving pan 3 through a circulation pipe 401, and a circulation pump 402 is arranged on the circulation pipe 401.

[0043] Furthermore, the heat exchanger 201 is located below the water receiving tray 3 .

[0044] When fresh air needs to be delivered to the room, the fresh air valve 101 is opened, and the outdoor air enters the fresh air duct 1; the condensed water condensed on the surface of the evaporator 203 collected in the water receiving tray 3 flows into the heat exchanger 201, and the condensed water circulates through the heat exchanger 201 under the action of the circulation pump 402; because the heat exchanger 201 is arranged in the fresh air duct 1, the outdoor fresh air exchanges heat with the condensed water in the heat exchanger 201 when flowing through the heat exchanger 201, and the cooled fresh air enters the room, so that the condensed water generated by the evaporator 203 cools the fresh air, avoiding large fluctuations in the indoor temperature caused by the introduction of fresh air, recovering the coldness of the condensed water, and ensuring the stability of the indoor temperature. By setting the circulation pump 402, the condensed water generated by the evaporator 203 collected in the water receiving tray 3 can circulate through the heat exchanger 201, continuously cooling the fresh air in the fresh air duct 1, improving the circulation speed of the condensed water in the water receiving tray 3, and also improving the refrigeration efficiency of the fresh air.

[0045] A filter device 102 is provided in the fresh air duct 1 to clean the fresh air.

[0046] Preferably, Figure 1 As shown, a water collecting tray 5 is arranged below the heat exchanger 201, and a humidifying element 202 is arranged in the fresh air duct 1; in the flow direction of the fresh air in the fresh air duct 1, the humidifying element 202 is arranged downstream of the heat exchanger 201, and the humidifying element 202 is connected with the inner cavity of the water collecting tray 5 through the humidifying duct 501, and a humidifying pump 502 is arranged on the humidifying duct 501.

[0047] When outdoor air (fresh air) flows through the heat exchanger 201, the fresh air will condense on the surface of the heat exchanger 201 to form condensed water, and the condensed water will flow to the water collecting pan 5 under the action of gravity; when it is necessary to humidify the room, the humidifying pump 502 is turned on, and the humidifying pump 502 sends the condensed water in the water collecting pan 5 to the humidifying element 202, and the fresh air after flowing through the heat exchanger 201 flows through the humidifying element 202. When the fresh air flows through the humidifying element 202, it absorbs moisture from the humidifying element 202 to increase the humidity of the fresh air. The fresh air with increased humidity enters the room to increase the indoor humidity. The water required by the humidifying element 202 comes from the moisture in the original air, and no additional water supply is required, which saves water resources; the temperature of the condensed water in the water collecting pan 5 is relatively low, which can effectively ensure the stability of the indoor temperature.

[0048] Preferably, Figure 1 As shown, the humidifying element 202 is a wet film humidifier, and the humidifying element 202 is arranged above the water collecting tray 5.

[0049] The humidifying element 202 is a wet film humidifier. The humidifying pump 502 sends the water in the water collection tray to the wet film humidifier to humidify the wet film humidifier. The air absorbs moisture when passing through the wet film humidifier. Since it is difficult for all the water on the wet film humidifier to be absorbed by the fresh air, the water flowing through the wet film humidifier flows into the water collection tray 5 again under the action of gravity, thus saving water. The temperature of the fresh air after passing through the heat exchanger 201 is relatively low. When flowing through the wet film humidifier, the fresh air can not only absorb part of the moisture, but also cool the water on the wet film humidifier. After absorbing the cold from the fresh air, the water enters the water collection tray 5 under the action of the humidifying pump 502, and can flow to the wet film humidifier again under the action of the humidifying pump 502. Thus, a recycling is formed to avoid the waste of cold.

[0050] Preferably, Figure 1 As shown, the air conditioning system includes a water supply pipe 6, which is connected to the humidification pipe 501 via a water supply three-way valve 602, and the water supply three-way valve 602 is arranged on the humidification pipe 501 between the humidification pump 502 and the water collecting tray 5; a humidification valve 503 is arranged on the humidification pipe 501 between the water supply three-way valve 602 and the water collecting tray 5, and a water supply valve 601 is arranged on the water supply pipe 6.

[0051] When the condensed water in the water collecting tray 5 is not enough for humidifying the room, water is supplied to the wet film humidifier through the water supply pipe 6. Specifically, when water supply is needed, the humidification valve 503 is closed, the water supply valve 601 is opened, the humidification pump 502 is turned on, and water is pumped from other water sources through the water supply pipe 6. The pumped water flows through the wet film humidifier, and the humidity increases after the fresh air flows through the wet film humidifier. Part of the water flowing through the wet film humidifier will flow into the water collecting tray 5 for temporary storage under the action of gravity; at this time, the water collecting tray 5 can not only store part of the water for humidification, but also collect the water that flows down from the wet film humidifier and cannot be absorbed by the air, so as to avoid water flowing everywhere. When the water level in the water collecting tray 5 is high and water supply is not needed, the water supply valve 601 is closed, the humidification valve 503 is opened, and the humidification pump 502 works to directly pump water from the water collecting tray 5. In this way, the effect of continuous indoor humidification is achieved. Since the wet film humidifier is arranged above the water collecting pan 5, the water replenished from the outside absorbs cold from the fresh air when flowing through the wet film humidifier and then flows into the water collecting pan 5 for standby, thus saving cold. That is, the fresh air first flows through the heat exchanger 201 to absorb cold, and then flows through the wet film humidifier to absorb moisture while partially condensing and transferring part of the condensation to the water on the wet film humidifier. The water on the wet film humidifier absorbs cold and then flows into the water collecting pan 5 for subsequent humidification, thus saving cold and water.

[0052] Furthermore, the inlet of the water supply pipe leads to an outdoor water source, such as tap water.

[0053] Preferably, Figure 1As shown, a heat exchange part 603 is provided between the water supply three-way valve 602 and the inlet of the water supply pipe 6 , and the heat exchange part 603 is provided in the water receiving tray 3 .

[0054] To further ensure the indoor temperature stability, the external water first flows through the heat exchange part 603 arranged in the water receiving tray 3 to exchange heat with the condensed water in the water receiving tray 3 for cooling before flowing to the wet film humidifier. The cooled water then flows to the wet film humidifier, thereby ensuring that the temperature of the fresh air is relatively stable after absorbing moisture from the wet film humidifier.

[0055] Preferably, Figure 1 As shown, a water outlet pipe 7 is provided on the water collecting tray 5 , and the water outlet pipe 7 is connected with the circulation pipe 401 through a water outlet three-way valve 702 ; a water outlet valve 701 is provided on the water outlet pipe 7 .

[0056] When there is too much water in the water collecting pan 5, the outlet valve 701 and the circulation pump 402 are opened. The circulation pump 402 can not only make the water in the water collecting pan 3 flow into the heat exchanger 201 and circulate, but also make the water in the water collecting pan 5 enter the circulation pipe 401 from the outlet pipe 7 and enter the water collecting pan 3. The water in the water collecting pan 3 flows into the heat exchanger 201 again. In this way, the water in the water collecting pan 5 is prevented from overflowing due to excessive condensation, saving water and cooling capacity. When the humidity of the outdoor air is high, there will be too much water in the water collecting pan 5.

[0057] Preferably, Figure 1 As shown, a drainage three-way valve 802 is provided on the circulation pipeline 401 between the water outlet three-way valve 702 and the circulation pump 402 , a drainage pipeline 8 is provided on the drainage three-way valve 802 , and a drainage valve 801 is provided on the drainage pipeline 8 .

[0058] Furthermore, the outlet of the drainage pipe 8 leads to the outdoors.

[0059] When there is a lot of water in the water receiving tray 3 and the water collecting tray 5, the drain valve 801 and the water outlet valve 701 are opened, and the water in the water receiving tray 3 and the water collecting tray 5 is discharged to the outside through the drainage pipe 8 to avoid overflow due to excessive water.

[0060] Preferably, Figure 1 As shown, the water collecting tray 5 is arranged outside the fresh air duct 1, the upper end opening of the water collecting tray 5 is sealed and connected to the outer wall surface of the fresh air duct 1, and the fresh air duct 1 is provided with a water permeable hole, which connects the inner hole of the fresh air duct 1 and the inner cavity of the water collecting tray 5.

[0061] The water collecting pan 5 is arranged outside the fresh air duct 1, so that the inner wall surface of the fresh air duct 1 is relatively complete, which is conducive to reducing wind resistance and improving the fluidity of air in the fresh air duct 1. The condensed water generated by the heat exchanger 201 flows downward from the water permeable hole into the water collecting pan 5, and the upper end opening of the water collecting pan 5 is sealed with the outer wall surface of the fresh air duct 1 to prevent the fresh air from leaking out from the water permeable hole.

[0062] Preferably, Figure 1 As shown, the indoor fresh air duct 1 is connected to a return air port, the return air port is arranged upstream of the heat exchanger 201 , and the return air port is provided with a return air valve 901 .

[0063] When fresh air is needed, the return air valve 901 is closed. When fresh air is not needed and the indoor air needs to be humidified, the fresh air valve 101 is closed and the return air valve 901 is opened. The indoor air enters the fresh air duct 1 and flows through the heat exchanger 201 and the wet film humidifier in sequence before entering the room. The indoor air absorbs moisture when flowing through the humidifying element 202, thereby achieving indoor humidification. Specifically, a return air duct 9 can be provided at the return air outlet to guide the return air.

[0064] Preferably, Figure 1 As shown, an air collecting pipe 208 is provided in the water receiving tray 3 , and the air collecting pipe 208 is connected to the evaporator 203 .

[0065] The low-temperature refrigerant in the evaporator 203 enters the gas collecting pipe 208 to cool the condensed water in the water receiving pan 3, so as to further reduce the temperature of the condensed water in the heat exchanger 201, thereby ensuring that the temperature of the air entering the room is basically consistent with the original temperature of the room. When a water supply pipe 6 is provided, the water in the water supply pipe 6 can also be further cooled when passing through the heat exchange part 603 in the water receiving pan 3, ensuring that the temperature of the air after water supply is consistent with the indoor air temperature.

[0066] Preferably, Figure 1 As shown, the air conditioning system also includes an air supply box 204 arranged indoors, the air supply box 204 is provided with an air inlet 206 and an air outlet 207, the evaporator 203 is arranged between the air inlet 206 and the air outlet 207; the air outlet 207 is provided with an air blower 205, and the outlet of the fresh air duct 1 is arranged on the air supply box 204 and is located between the evaporator 203 and the air blower 205.

[0067] Through the above arrangement, when the fresh air valve 101 and the return air valve 901 are closed, the blower 205 works, and the indoor air passes through the air inlet 206, the evaporator 203, the blower 205 and the air outlet 207 in sequence and then enters the room; at this time, the air supply box 204 is equivalent to the indoor unit. When the fresh air valve 101 or the return air valve 901 is opened, the blower 205 is turned on to form a suction effect on the inside of the fresh air duct 1 so that the outdoor air or the indoor air passes through the suction valve and the return air valve 901 and enters the fresh air duct 1. The blower 205 of the existing indoor unit is used to form a suction effect on the inside of the fresh air duct 1, and there is no need to set up an additional blower, which simplifies the structure.

[0068] When the air conditioning system is applied to the fresh-keeping warehouse, the humidity and temperature in the fresh-keeping warehouse can be stably maintained within a certain range, thereby improving the fresh-keeping function of the fresh-keeping warehouse.

[0069] The present invention also provides a control method for an air conditioning system, the air conditioning system being the air conditioning system described above, the control method comprising a fresh air heat exchange method, the fresh air heat exchange method comprising: controlling the fresh air valve 101 to open, and controlling the circulation pump 402 to open.

[0070] Figure 5 It is a flow chart of indoor air conditioning. The air conditioning includes a fresh air heat exchange method. The fresh air heat exchange method includes: controlling the fresh air valve 101 to be opened, controlling the circulation pump 402 to be opened, and the outdoor air enters the fresh air duct 1 through the fresh air valve 101 and flows through the heat exchange duct. Since the circulation pump 402 is turned on, the water in the water receiving tray 3 continues to flow through the heat exchanger 201, which makes the fresh air flowing through the heat exchanger 201 able to cool down, thereby ensuring that the temperature of the fresh air entering the room is basically consistent with the original indoor temperature, avoiding fluctuations in the indoor temperature.

[0071] Preferably, when a water collecting tray 5, a humidifying element 202, a humidifying pipe 501 and a humidifying pump 502 are provided, the control method includes a fresh air humidification method, and the fresh air humidification method includes: controlling the fresh air valve 101 to open, controlling the circulating pump 402 to open, and controlling the humidifying pump 502 to open with a first range of power.

[0072] The indoor humidity is low, and it is necessary to humidify the air while delivering fresh air. At this time, a fresh air humidification method is adopted. The fresh air humidification method includes: controlling the fresh air valve 101 to open, controlling the circulation pump 402 to open, and controlling the humidification pump 502 to open with a first range of power. When the fresh air flows through the heat exchanger 201, condensation will also occur. The moisture contained in the fresh air condenses on the surface of the heat exchanger 201, which causes the fresh air to be relatively dry. When the fresh air passes through the humidification component 202, it is necessary not only to consider the situation that the fresh air itself is relatively dry, but also to consider the situation that the indoor air is relatively dry and needs to be humidified. By controlling the humidification pump 502 to open at the first range of power, more water flows to the humidification component 202, which can greatly increase the humidity of the fresh air to accelerate the increase of indoor humidity.

[0073] Preferably, when a water collecting tray 5, a humidifying element 202, a humidifying pipe 501 and a humidifying pump 502 are provided, the control method includes a fresh air moisturizing method, and the fresh air moisturizing method includes: controlling the fresh air valve 101 to open, controlling the circulating pump 402 to open, and controlling the humidifying pump 502 to open at a second range power.

[0074] The room does not need humidification, but the humidity of the fresh air needs to be consistent with the indoor humidity. In this case, the fresh air moisturizing method is used. The fresh air moisturizing method includes: controlling the fresh air valve 101 to open, the fresh air enters the fresh air duct 1, controlling the circulation pump 402 to open, the condensed water in the water receiving tray 3 circulates through the heat exchanger 201 to cool and dehumidify, and controlling the humidification pump 502 to open with the second range power. At this time, the fresh air flowing through the humidification element 202 only needs to increase the humidity of the fresh air so that the humidity of the fresh air is consistent with the indoor humidity. The second range power is less than the first range power.

[0075] Preferably, when a return air valve 901, a water collecting tray 5, a humidifying element 202, a humidifying pipe 501 and a humidifying pump 502 are provided, the control method includes a return air humidification method, and the return air humidification method includes: controlling the fresh air valve 101 to close, controlling the return air valve 901 to open, and controlling the humidification pump 502 to open.

[0076] When the room needs to be humidified but fresh air is not needed, a return air humidification method is used. The return air humidification method includes: controlling the fresh air valve 101 to be closed and the return air valve 901 to be opened, so that the indoor air enters the fresh air duct 1 from the return air port and flows through the heat exchanger 201 and the humidifying element 202 before entering the room, controlling the humidifying pump 502 to be turned on, so that the water in the water collecting tray 5 flows to the humidifying element 202, and the return air absorbs the water on the humidifying element 202 when flowing through the humidifying element 202, and the humidity increases. The return air with increased humidity enters the room to increase the indoor humidity.

[0077] Preferably, a first water level sensor is provided in the water receiving tray 3. When a drain valve 801, a drain pipe 8 and a circulation valve are provided, the control method includes a water level control method for the water receiving tray 3. The water level control method for the water receiving tray 3 includes: when the water level H0 in the water receiving tray 3 is higher than the first preset water level H1, controlling the circulation pump 402 to close, controlling the water outlet valve 701 to close, and controlling the drain valve 801 to open.

[0078] The first preset water level is a high water level, and at this time, the water in the water receiving pan 3 needs to be drained to avoid overflow. The water level control method of the water receiving pan 3 includes: when the water level H0 in the water receiving pan 3 is higher than the first preset water level H1, the circulating pump 402 is controlled to be closed, the water outlet valve 701 is controlled to be closed, and the drain valve 801 is controlled to be opened, and the water in the water receiving pan 3 is discharged to the outside from the drain pipe 8. The reasons for the excessive water in the water receiving pan 3 include: 1. During the water replenishment process, too much water outdoors enters the water collecting pan 5, and the circulating pump 402 pumps the water in the water collecting pan 5 into the water receiving pan 3, resulting in excessive water in the water receiving pan 3; 2. The air conditioning system is running for a long time, and the indoor air generates a lot of condensed water in the evaporator 203, which is finally collected in the water collecting pan 5.

[0079] Preferably, a second water level sensor is provided in the water collecting tray 5. When a water outlet valve 701, a water replenishment valve 601 and a humidifying pump 502 are provided, the control method includes a water level control method for the water collecting tray 5, and the water level control method for the water collecting tray 5 includes: detecting the water level H in the water collecting tray 5, and when H>h1 and H0

[0080] like Figure 6 As shown, the water level control method of the water collecting pan 5 includes: detecting the water level H in the water collecting pan 5, when H>h1 and H0

[0081] ​​When h2≤H≤h1 and the room needs to be humidified, the humidification pump 502 and the humidification valve 503 are controlled to be turned on, and the water replenishment valve 601, the water outlet valve 701 and the circulation pump 402 are controlled to be turned off;

[0082] When H<h2 and the room needs to be humidified, the humidification pump 502 and the water replenishment valve 601 are controlled to be opened, and the water replenishment valve 701, the humidification valve 503 and the circulation pump 402 are controlled to be closed.

[0083] When h2≤H≤h1 and the room needs to be humidified, the humidification pump 502 and the humidification valve 503 are controlled to be opened, and the water replenishment valve 601, the water outlet valve 701 and the circulation pump 402 are controlled to be closed, and water is pumped from the water collecting pan 5 for humidification;

[0084] When H<h2 and the room needs to be humidified, the humidification pump 502 and the water replenishment valve 601 are controlled to be opened, and the water replenishment valve 701, the humidification valve 503 and the circulation pump 402 are controlled to be closed. If there is too little water in the water collection tray 5, water is replenished from the outside for humidification.

[0085] The second water level sensor may include a high water level sensor and a low water level sensor, the high water level sensor being disposed at h1 and the low water level sensor being disposed at h2.

[0086] Preferably, the water level control method of the water collecting tray 5 also includes: when H>h1 and H0≥H1, controlling the outlet valve 701 and the drain valve 801 to open, controlling the water replenishment valve 601, the humidification valve 503 and the humidification pump 502 to close, and controlling the circulation pump 402 to open or close.

[0087] When H>h1 and H0≥H1, the condensed water in the water receiving tray 3 and the water collecting tray 5 needs to be discharged. The water outlet valve 701 and the drain valve 801 are controlled to be opened, and the water in the water collecting tray 5 can be discharged through the drain valve 801; the water replenishment valve 601, the humidification valve 503 and the humidification pump 502 are controlled to be closed. The reason for humidification is that, according to actual conditions, the water level in the water receiving tray 3 can be greater than H1 because the evaporator produces more condensed water, which means that the humidity of the indoor air is relatively high and no humidification is needed. Control the circulation pump 402 to be turned on or off; when the circulation pump 402 is turned off, the condensed water in the water receiving pan 3 and the water collecting pan 5 is discharged through the drain valve 801; when the circulation pump 402 is turned on, the water flowing out of the water collecting pan 5 is divided into two parts, one part is discharged through the drain valve 801, and the other part enters the water receiving pan 3 through the circulation pump 402. At this time, the water speed entering the water receiving pan 3 should not be greater than the water speed flowing out of the water receiving pan 3 to avoid the water in the water receiving pan 3 overflowing; by making part of the water in the water collecting pan 5 enter the water receiving pan 3, and at the same time the water in the water receiving pan 3 flows out, the water flowing out of the water receiving pan 3 is mixed with the water flowing out of the water collecting pan 5 and flows through the drainage three-way valve 802, part of the water is discharged through the drain valve 801, and part of the water enters the water receiving pan 3 through the circulation pump 402, and the cycle is repeated; and because the water quality in the water collecting pan 5 is higher than the water quality in the water receiving pan 3, the water quality in the water receiving pan 3 will gradually increase, which can prevent the water in the water receiving pan 3 from evaporating again and entering the room to cause pollution to the room. Compared with first draining the water in the water receiving pan 3 and then pumping the water in the water collecting pan 5 into the water receiving pan 3, in this process, since there is always water in the water receiving pan 3, it can be ensured that there is condensed water in the heat exchanger 201, thereby ensuring continuous cooling of the fresh air.

[0088] For the water in the water receiving pan 3, the condensed water generated by the indoor evaporator 203, and the water in the water collecting pan 5 are condensed water generated by the outdoor air flowing through the heat exchanger 201. After a long time, the water will contain impurities. It is necessary to regularly discharge the water in the water receiving pan 3 and the water collecting pan 5 (to protect impurities) to prevent indoor pollution and avoid pipe blockage. A method for updating the water in the water receiving pan 3: first, control the water outlet valve 701 and the drain valve 801 to open, and control the circulation pump 402 to close. At this time, the water in the water receiving pan 3 and the water collecting pan 5 is discharged from the drainage pipe 8; second, control the water outlet valve 701 to open, the drain valve 801 to close, the circulation pump 402 to open, the water replenishment valve 601 to open, and the humidification pump 502 to open. The outdoor water flows through the humidifying element 202 after the action of the humidification pump 502 and flows into the water collecting pan 5. The circulation pump 402 draws the water in the water collecting pan 5 into the water receiving pan 3, so as to achieve the renewal of the water in the water collecting pan 5 and the water receiving pan 3. The reason for keeping a certain amount of water in the water receiving pan 3 is to utilize the air collecting pipe 208 to cool the water in the water receiving pan 3, so that the cooled water can cool the fresh air when it flows into the heat exchanger 201.

[0089] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0090] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. An air conditioning system, comprising an evaporator (203), wherein a water receiving tray (3) is arranged below the evaporator (203); It is characterized in that The air conditioning system further comprises a fresh air duct (1), the air inlet end of the fresh air duct (1) being arranged outdoors, and the air inlet end of the fresh air duct (1) being arranged with a fresh air valve (101); a heat exchanger (201) being arranged in the fresh air duct (1), the inlet of the heat exchanger (201) being connected to the inner cavity of the water receiving tray (3) via a water inlet pipe, and the outlet of the heat exchanger (201) being connected to the inner cavity of the water receiving tray (3) via a circulation pipe (401), and a circulation pump (402) being arranged on the circulation pipe (401).

2. The air conditioning system according to claim 1, It is characterized in that A water collecting pan (5) is arranged below the heat exchanger (201), and a humidifying element (202) is arranged in the fresh air duct (1); in the flow direction of the fresh air in the fresh air duct (1), the humidifying element (202) is arranged downstream of the heat exchanger (201), the humidifying element (202) is connected to the inner cavity of the water collecting pan (5) via the humidifying duct (501), and a humidifying pump (502) is arranged on the humidifying duct (501).

3. The air conditioning system according to claim 2, It is characterized in that The humidifying element (202) is a wet film humidifier, and the humidifying element (202) is arranged above the water collecting tray (5).

4. The air conditioning system according to claim 3, It is characterized in that The air conditioning system comprises a water supply pipe (6), wherein the water supply pipe (6) is connected to the humidification pipe (501) via a water supply three-way valve (602), and the water supply three-way valve (602) is arranged on the humidification pipe (501) between the humidification pump (502) and the water collecting tray (5); a humidification valve (503) is arranged on the humidification pipe (501) between the water supply three-way valve (602) and the water collecting tray (5), and a water supply valve (601) is arranged on the water supply pipe (6).

5. The air conditioning system according to claim 4, It is characterized in that A heat exchange portion (603) is provided between the water replenishment three-way valve (602) and the inlet of the water replenishment pipeline (6), and the heat exchange portion (603) is provided in the water receiving tray (3).

6. The air conditioning system according to claim 2, It is characterized in that The water collecting tray (5) is provided with a water outlet pipe (7), and the water outlet pipe (7) is connected to the circulation pipe (401) via a water outlet three-way valve (702); the water outlet pipe (7) is provided with a water outlet valve (701).

7. The air conditioning system according to claim 6, It is characterized in that A drainage three-way valve (802) is provided on the circulation pipeline (401) between the water outlet three-way valve (702) and the circulation pump (402), a drainage pipeline (8) is provided on the drainage three-way valve (802), and a drainage valve (801) is provided on the drainage pipeline (8).

8. The air conditioning system according to claim 2, It is characterized in that The water collecting tray (5) is arranged outside the fresh air duct (1), the upper end opening of the water collecting tray (5) is sealedly connected to the outer wall surface of the fresh air duct (1), and the fresh air duct (1) is provided with a water permeable hole, which connects the inner hole of the fresh air duct (1) and the inner cavity of the water collecting tray (5).

9. The air conditioning system according to claim 2, It is characterized in that The indoor fresh air duct (1) is connected to a return air port, the return air port is arranged upstream of the heat exchanger (201), and the return air port is provided with a return air valve (901).

10. The air conditioning system according to claim 1, It is characterized in that An air collecting pipe (208) is arranged in the water receiving tray (3), and the air collecting pipe (208) is connected to the evaporator (203).

11. The air conditioning system according to any one of claims 1 to 10, It is characterized in that The air conditioning system further comprises an air supply box (204) arranged indoors, the air supply box (204) being provided with an air inlet (206) and an air outlet (207), the evaporator (203) being arranged between the air inlet (206) and the air outlet (207); the air outlet (207) being provided with an air blower (205), and the outlet of the fresh air duct (1) being arranged on the air supply box (204) and being located between the evaporator (203) and the air blower (205).

12. A method for controlling an air conditioning system, It is characterized in that The air conditioning system is the air conditioning system according to any one of claims 1 to 11, and the control method includes a fresh air heat exchange method, which includes: controlling the fresh air valve (101) to open, and controlling the circulation pump (402) to open.

13. The control method according to claim 12, It is characterized in that When a water collecting tray (5), a humidifying element (202), a humidifying pipe (501) and a humidifying pump (502) are provided, the control method includes a fresh air humidification method, and the fresh air humidification method includes: controlling the fresh air valve (101) to open, controlling the circulation pump (402) to open, and controlling the humidification pump (502) to open at a first range of power.

14. The control method according to claim 12, It is characterized in that When a water collecting tray (5), a humidifying element (202), a humidifying pipe (501) and a humidifying pump (502) are provided, the control method includes a fresh air moisturizing method, and the fresh air moisturizing method includes: controlling the fresh air valve (101) to open, controlling the circulation pump (402) to open, and controlling the humidifying pump (502) to open at a second range of power.

15. The control method according to claim 12, It is characterized in that When a return air valve (901) is provided, a water collecting tray (5), a humidifying element (202), a humidifying pipe (501) and a humidifying pump (502) are provided, the control method includes a return air humidification method, and the return air humidification method includes: controlling the fresh air valve (101) to be closed, controlling the return air valve (901) to be opened, and controlling the humidifying pump (502) to be opened.

16. The control method according to claim 12, It is characterized in that A first water level sensor is provided in the water receiving tray (3). When a drain valve (801), a drain pipe (8) and a circulation valve are provided, the control method comprises a water level control method for the water receiving tray (3). The water level control method for the water receiving tray (3) comprises: when the water level H0 in the water receiving tray (3) is higher than a first preset water level H1, controlling the circulation pump (402) to be closed, controlling the water outlet valve (701) to be closed, and controlling the drain valve (801) to be opened.

17. The control method according to claim 16, It is characterized in that When a water collecting pan (5) is provided, a second water level sensor is provided in the water collecting pan (5); when a water outlet valve (701), a water replenishment valve (601), a humidification pump (502) and a humidification valve (503) are provided, the control method comprises a water level control method of the water collecting pan (5); the water level control method of the water collecting pan (5) comprises: detecting the water level H in the water collecting pan (5); when H>h1 and H0<H1, controlling the water outlet valve (701) and the circulation pump (402) to open, and controlling the water replenishment valve (601), the humidification valve (503), the humidification pump (502) and the drain valve (801) to close; and when H≤h1, further determining whether it is necessary to humidify the room; if the room needs to be humidified, humidifying the room.

18. The control method according to claim 17, It is characterized in that When H≤h1, further determine whether the room needs to be humidified. When the room needs to be humidified, humidify the room, including: When h2≤H≤h1 and the indoor humidification is required, the humidification pump (502) and the humidification valve (503) are controlled to be turned on, and the water replenishment valve (601), the water outlet valve (701) and the circulation pump (402) are controlled to be turned off; When H<h2 and the indoor humidification is required, the humidification pump (502) and the water replenishment valve (601) are controlled to be opened, and the water replenishment valve (701), the humidification valve (503) and the circulation pump (402) are controlled to be closed.

19. The control method according to claim 17, It is characterized in that The water level control method of the water collecting tray (5) further comprises: when H>h1 and H0≥H1, controlling the water outlet valve (701) and the drain valve (801) to be opened, controlling the water replenishment valve (601), the humidification valve (503) and the humidification pump (502) to be closed, and controlling the circulation pump (402) to be opened or closed.

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