CN116951607A - Fresh air conditioner and corresponding control method thereof - Google Patents

Abstract

The application provides a fresh air conditioner and a corresponding control method thereof, wherein the fresh air conditioner comprises an inner machine module, the inner machine module is provided with a fresh air channel and an exhaust channel, the fresh air channel is provided with a first heat exchanger and a second heat exchanger positioned on the air inlet side of the first heat exchanger, the first heat exchanger is close to a fresh air outlet, a third heat exchanger is arranged in the exhaust channel, a return port is arranged on a partition plate, the return port is used for communicating the air inlet side space of the second heat exchanger with the air outlet side space of the third heat exchanger, the fresh air conditioner also comprises an outdoor side heat exchanger and an intermediate heat exchanger, the first heat exchanger, the third heat exchanger and a first heat exchange runner in the intermediate heat exchanger are connected in series to form a first flow path, the second heat exchange runner in the intermediate heat exchanger and the second heat exchanger are connected in series to form a second flow path, and the first flow path is connected with the second flow path in parallel. The system has low operation power consumption, and the fresh air and the return air are sent into the room after being dehumidified and heated, so that the comfort is high.

Description

Fresh air conditioner and corresponding control method thereof

Technical Field

The application belongs to the technical field of air conditioning, and particularly relates to a fresh air conditioner and a corresponding control method thereof.

Background

Along with the continuous improvement of the requirements of customers on the air temperature and humidity, the requirements on the temperature and humidity control of a unit are gradually enhanced, and the problem of reduced comfort caused by the excessively low air outlet temperature in the refrigerating and dehumidifying process is solved by adopting an independent temperature and humidity control method at present. However, the dehumidifying and temperature-regulating system in the existing fresh air handling unit has inconvenience and defects in structure and use, and needs to be further improved. Specifically, in the prior art, most of fresh air conditioners respectively control and adjust the temperature and the humidity through a plurality of sets (at least two sets) of units, and the system consumes great energy in the mode.

Disclosure of Invention

Therefore, the application provides a fresh air conditioner and a corresponding control method thereof, which can solve the technical problem of larger power consumption of a temperature and humidity adjusting system of the fresh air conditioner in the prior art.

In order to solve the problems, the application provides a fresh air conditioner, which comprises an inner machine module arranged corresponding to an indoor space, wherein the inner machine module comprises an inner machine shell, a baffle plate arranged in the inner machine shell separates the inner space of the inner machine shell to form a fresh air channel and an exhaust channel, the fresh air channel is provided with a fresh air inlet selectively communicated with an external environment and a fresh air outlet selectively communicated with the indoor space, the exhaust channel is provided with an exhaust outlet selectively communicated with the external environment and an exhaust inlet selectively communicated with the indoor space, the fresh air channel is provided with a first heat exchanger and a second heat exchanger positioned on the air inlet side of the first heat exchanger, the first heat exchanger is close to the fresh air outlet, a third heat exchanger is arranged in the exhaust channel, a return port is arranged on the baffle plate, the return port is used for communicating the air inlet side space of the second heat exchanger with the air outlet side space of the third heat exchanger, the air conditioner further comprises an outdoor side heat exchanger and an intermediate heat exchanger, the first heat exchanger, the intermediate heat exchanger and the second heat exchanger are in series connection with the first heat exchanger and the second heat exchanger, the first heat exchanger is in parallel with the second heat exchanger, the air inlet is in a compression flow path is formed between the first heat exchanger and the second heat exchanger, and the compression flow path is in a compression flow path.

In some embodiments, the first flow path is further connected in series with a first throttling element and a second throttling element, the first throttling element is located between the outdoor side heat exchanger and the first heat exchanger, and the second throttling element is located between the first heat exchanger and the third heat exchanger.

In some embodiments of the present application, in some embodiments,

a third throttling element is also streamed in the second flow path, the third throttling element being located between the intermediate heat exchanger and the second heat exchanger.

In some embodiments of the present application, in some embodiments,

the first flow path is also connected with a third cut-off valve in series, the third cut-off valve is positioned at one side, far away from the third heat exchanger, of the intermediate heat exchanger, the second flow path is also connected with a second cut-off valve and a first cut-off valve in series, wherein the second cut-off valve is positioned on a pipe section, close to the outdoor side heat exchanger, of the second flow path, and the first cut-off valve is positioned on a pipe section, close to the air suction port of the compressor, of the second flow path.

In some embodiments, the compressor further comprises a four-way reversing valve, a first port of the four-way reversing valve is communicated with an exhaust port of the compressor, a second port of the four-way reversing valve is communicated with a first end of the outdoor side heat exchanger, a third port of the four-way reversing valve is communicated with an air suction port of the compressor, and a fourth port of the four-way reversing valve is communicated with a second end of the first flow path and the second flow path which are connected in parallel.

In some embodiments, a fresh air valve is arranged in the fresh air inlet, an exhaust air valve is arranged in the exhaust air outlet, and a return air valve is arranged in the return opening.

In some embodiments, a humidifying component is further arranged in the fresh air channel, and the humidifying component is located on the air outlet side of the first heat exchanger.

The application also provides a control method of the fresh air conditioner, which comprises the following steps:

acquiring an operation mode of the fresh air conditioner;

and controlling the opening and closing of the fresh air inlet, the air exhaust outlet and the reflux port according to the acquired operation mode, and controlling the on-off of the first flow path and the second flow path.

In some embodiments of the present application, in some embodiments,

when the operation mode is a dehumidification mode, the fresh air inlet, the exhaust outlet and the reflux port are controlled to be all opened, and the first flow path and the second flow path are controlled to be communicated.

In some embodiments of the present application, in some embodiments,

when the first throttling element, the second throttling element and the third throttling element are included, the first throttling element, the second throttling element and the third throttling element are controlled to be in a throttling state.

In some embodiments of the present application, in some embodiments,

when the operation mode is a dehumidification heating mode, the fresh air inlet, the exhaust outlet and the reflux port are controlled to be opened and closed, and the first flow path is controlled to be communicated and the second flow path is controlled to be cut off.

In some embodiments of the present application, in some embodiments,

when the fresh air conditioner further comprises a four-way reversing valve and the operation mode is a refrigeration mode, controlling the four-way reversing valve to be in a refrigeration state, controlling the fresh air inlet and the exhaust outlet to be closed and the reflux port to be opened, and controlling the second flow path to be communicated and the first flow path to be cut off; or alternatively, the process may be performed,

when the fresh air conditioner further comprises a four-way reversing valve and the operation mode is a heating mode, the four-way reversing valve is controlled to be in a heating state, the fresh air inlet and the air exhaust outlet are controlled to be closed, the backflow port is controlled to be opened, the second flow path is controlled to be communicated, and the first flow path is controlled to be cut off.

The fresh air conditioner and the corresponding control method thereof provided by the application have the following beneficial effects:

when the fresh air conditioner runs in a dehumidification mode, the first flow path and the second flow path are controlled to be simultaneously communicated, two-stage dehumidification is achieved at the third heat exchanger and the second heat exchanger, outdoor fresh air is dehumidified at the second heat exchanger, the dehumidified indoor return air and fresh air are heated and warmed at the first heat exchanger after being mixed, the dehumidified cold air is prevented from being directly fed into an indoor space to cause discomfort to a user, meanwhile, heat exchange is conducted between a refrigerant in the first flow path and a refrigerant in the second flow path at the middle heat exchanger, the refrigerant in the second flow path enters the second heat exchanger after being supercooled by the refrigerant in the first flow path, so that the evaporation temperature of the second heat exchanger is lower, and the condensation dehumidification requirements of the fresh air and the indoor return air are fully met.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those skilled in the art from this disclosure that the drawings described below are merely exemplary and that other embodiments may be derived from the drawings provided without undue effort.

The structures, proportions, sizes, etc. shown in the present specification are shown only for the purposes of illustration and description, and are not intended to limit the scope of the application, which is defined by the claims, so that any structural modifications, changes in proportions, or adjustments of sizes, which do not affect the efficacy or the achievement of the present application, should fall within the ambit of the technical disclosure.

FIG. 1 is a schematic diagram of a fresh air conditioner according to an embodiment of the present application;

fig. 2 is a schematic diagram (status indication) of refrigerant flow direction when the fresh air conditioner according to the embodiment of the application operates in a dehumidification mode;

fig. 3 is a schematic diagram (status indication) of a refrigerant flow direction when the fresh air conditioner according to the embodiment of the application operates in a dehumidifying and heating mode;

fig. 4 is a schematic diagram (status indication) of refrigerant flow direction when the fresh air conditioner according to the embodiment of the application operates in a refrigeration mode;

fig. 5 is a schematic diagram (status indication) of refrigerant flow direction when the fresh air conditioner according to the embodiment of the application operates in a heating mode;

FIG. 6 is a schematic diagram of a control logic of a fresh air conditioner (without heating mode) according to another embodiment of the present application;

fig. 7 is a schematic diagram of control logic of a fresh air conditioner according to another embodiment of the present application in a heating mode of operation.

The reference numerals are expressed as:

1. an inner machine shell; 11. a partition plate;

21. a first heat exchanger; 22. a second heat exchanger; 23. a third heat exchanger; 24. an outdoor side heat exchanger; 25. an intermediate heat exchanger;

3. a compressor;

41. a first throttling element; 42. a second throttling element; 43. a third throttling element;

51. a first shut-off valve; 52. a second shut-off valve; 53. a third shut-off valve;

6. a four-way reversing valve;

71. a fresh air valve; 72. an exhaust air valve; 73. a return air valve;

8. a humidifying member;

91. an air outlet temperature sensor; 92. an indoor temperature and humidity sensor; 93. an outdoor temperature and humidity sensor;

101. a fresh air channel; 1011. a fresh air inlet; 1012. a fresh air outlet; 102. an exhaust passage; 1021. an exhaust outlet; 1022. an exhaust inlet;

103. fresh air blower; 104. and an exhaust fan.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present application, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present application; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present application.

Referring to fig. 1 and 7 in combination, according to an embodiment of the present application, there is provided a fresh air conditioner including an indoor unit module (not shown) provided corresponding to an indoor space, the indoor unit module including an indoor unit casing 1, a partition 11 provided in the indoor unit casing 1 partitioning an inner space of the indoor unit casing 1 to form a fresh air passage 101 and an exhaust passage 102, the fresh air passage 101 having a fresh air inlet 1011 selectively communicating with an external environment and a fresh air outlet 1012 selectively communicating with the indoor space, the exhaust passage 102 having an exhaust outlet 1021 selectively communicating with the external environment and an exhaust inlet 1022 selectively communicating with the indoor space, the fresh air passage 101 being provided with a first heat exchanger 21 and a second heat exchanger 22 on an air intake side of the first heat exchanger 21, wherein the first heat exchanger 21 is adjacent to the fresh air outlet 1012, that is, the fresh air entering through the fresh air inlet 1011 can flow through the second heat exchanger 22 and the first heat exchanger 21 in sequence and then be sent into the indoor space through the fresh air outlet 1012, the exhaust channel 102 is internally provided with the third heat exchanger 23, the baffle 11 is provided with a backflow port, the backflow port communicates the air inlet side space of the second heat exchanger 22 with the air outlet side space of the third heat exchanger 23, that is, the indoor return air entering through the exhaust inlet 1022 can enter the fresh air channel 101 through the backflow port and can be sent into the indoor space after exchanging heat with the heat exchanger of the fresh air channel 101 again, as shown in fig. 1, the fresh air conditioner further comprises an outdoor side heat exchanger 24 and an intermediate heat exchanger 25, the first heat exchange flow channels in the first heat exchanger 21, the third heat exchanger 23 and the intermediate heat exchanger 25 are connected in series to form a first flow path, the second heat exchange flow channel in the intermediate heat exchanger 25 and the second heat exchanger 22 are connected in series to form a second flow path, the first flow path is connected in parallel with the second flow path, the first end of the first flow path and the first end of the second flow path are in summarized communication with one side of the outdoor side heat exchanger 24 away from the exhaust port of the compressor 3, and the second end of the first flow path and the second end of the second flow path can be in summarized communication with the air suction port of the compressor 3.

In the technical scheme, when the fresh air conditioner runs in a dehumidification mode, the first flow path and the second flow path are controlled to be simultaneously communicated, two-stage dehumidification is realized at the third heat exchanger 23 and the second heat exchanger 22, dehumidification is realized at the second heat exchanger 22 by outdoor fresh air, the dehumidified indoor return air and the fresh air are heated and warmed at the first heat exchanger 21 after being mixed, the dehumidified cold air is prevented from being directly fed into an indoor space to cause discomfort to a user, meanwhile, the refrigerant in the first flow path and the refrigerant in the second flow path are subjected to heat exchange at the middle heat exchanger 25, the refrigerant in the second flow path is supercooled by the refrigerant in the first flow path and then enters the second heat exchanger 22, so that the evaporation temperature of the second heat exchanger 22 is lower, the condensation dehumidification requirements of the fresh air and the indoor return air are fully met, and because the first flow path and the second flow path form heat exchange at the middle heat exchanger 25, the energy efficiency of an air conditioning system can be improved, and the system power consumption is reduced.

In some embodiments, the first flow path is further connected in series with a first throttling element 41 and a second throttling element 42, where the first throttling element 41 is located between the outdoor side heat exchanger 24 and the first heat exchanger 21, and the second throttling element 42 is located between the first heat exchanger 21 and the third heat exchanger 23, and the aforementioned throttling element may specifically be an electronic expansion valve.

By providing the first throttling element 41 between the outdoor side heat exchanger 24 and the first heat exchanger 21 and providing the second throttling element 42 between the first heat exchanger 21 and the third heat exchanger 23, the evaporation temperatures of the first heat exchanger 21 and the third heat exchanger 23 can be adjusted by adjusting the opening degrees of the first throttling element 41 and the second throttling element 42, so that the reasonable adjustment can be performed according to the actual humidity and temperature of the indoor space.

The second flow path is also streamed with a third throttling element 43, the third throttling element 43 being located between the intermediate heat exchanger 25 and the second heat exchanger 22.

In this technical scheme, the third throttling element 43 is connected in series between the intermediate heat exchanger 25 and the second heat exchanger 22 to realize the throttling adjustment of the refrigerant in the second flow path, so that the refrigerant circulation of the second flow path can be independently adjusted to realize the adjustment of the cooling mode and the heating mode of the fresh air conditioner.

In some embodiments of the present application, in some embodiments,

the first flow path is further connected in series with a third cut-off valve 53, the third cut-off valve 53 is located at a side of the intermediate heat exchanger 25 away from the third heat exchanger 23, the second flow path is further connected in series with a second cut-off valve 52 and a first cut-off valve 51, wherein the second cut-off valve 52 is located on a section of the second flow path close to the outdoor side heat exchanger 24, and the first cut-off valve 51 is located on a section of the second flow path close to the air suction port of the compressor 3, and each cut-off valve may specifically be an electromagnetic valve.

In this embodiment, by providing the third shutoff valve 53, the second shutoff valve 52, and the first shutoff valve 51 in the first flow path and the second flow path, respectively, the refrigerant in the first flow path and the second flow path can be circulated and air-conditioned, so that the refrigerant in the fresh air conditioner flows into different pipelines in different operation modes.

To further enrich the operation modes of the fresh air conditioner of the present application, in some embodiments, the fresh air conditioner further includes a four-way reversing valve 6, a first port of the four-way reversing valve 6 is communicated with an exhaust port of the compressor 3, a second port is communicated with a first end of the outdoor side heat exchanger 24, a third port is communicated with an air suction port of the compressor 3, and a fourth port is communicated with a second end of the first flow path and the second flow path connected in parallel, so that the fresh air conditioner can be switched between heating and cooling by switching the state of the four-way reversing valve 6. Specifically, referring to fig. 1 to 5 in combination, the four-way selector valve 6 has a heating state and a cooling state, that is, when the fresh air conditioner is operating in the heating mode, the four-way selector valve 6 is adjusted to be in the heating state in which the first port of the four-way selector valve 6 communicates with the fourth port and the second port communicates with the third port, and in the cooling mode, the dehumidifying mode, and the dehumidifying and heating mode, the four-way selector valve 6 is adjusted to be in the cooling state in which the first port of the four-way selector valve 6 communicates with the second port and the third port communicates with the fourth port.

In order to control the introduction of fresh air, the return air or the exhaust of indoor return air, a fresh air valve 71 is arranged in the fresh air inlet 1011, an exhaust air valve 72 is arranged in the exhaust air outlet 1021, and a return air valve 73 is arranged in the return air inlet, wherein the air valves are all air valve assemblies in the prior art, and the specific structure of the application is not particularly limited.

Specifically, when the fresh air conditioner operates in the dehumidification mode, the fresh air valve 71 and the return air valve 73 are controlled to be opened, the exhaust air valve 72 is controlled to be closed, and at the moment, the fresh air fan 103 arranged corresponding to the first heat exchanger 21 and the exhaust air fan 104 arranged corresponding to the third heat exchanger 23 are operated, outdoor fresh air is driven to enter the fresh air channel 101 respectively, and indoor return air enters the fresh air channel 101 through the exhaust air channel 102 and the overflow hole; when the fresh air conditioner operates in a dehumidification heating mode, the fresh air valve 71 and the exhaust air valve 72 are controlled to be opened, and the return air valve 73 is controlled to be closed, at the moment, the fresh air fan 103 and the exhaust air fan 104 are operated, outdoor fresh air is driven to enter the fresh air channel 101, and indoor return air is driven to be discharged outdoors through the exhaust air channel 102; when the fresh air conditioner operates in a heating mode or a cooling mode, the fresh air valve 71 and the exhaust air valve 72 are controlled to be closed, the return air valve 73 is controlled to be opened, and at the moment, the fresh air fan 103 is operated to drive indoor return air to enter the exhaust channel 102, and then the indoor return air is subjected to heat exchange at the second heat exchanger 22 and then is sent into a room through the fresh air outlet 1012.

In some embodiments, a humidifying component 8 is further disposed in the fresh air channel 101, where the humidifying component 8 is located on the air outlet side of the first heat exchanger 21, and the humidifying component 8 is, for example, an existing ultrasonic humidifier.

In this technical scheme, through setting up humidification part 8 at the air-out side of first heat exchanger 21, can control its operation to indoor air conditioner humidification when indoor humidity is too low, promote user's travelling comfort.

According to an embodiment of the present application, there is also provided a method for controlling a fresh air conditioner as described above, including the steps of:

acquiring an operation mode of the fresh air conditioner;

and controlling the opening and closing of the fresh air inlet 1011, the exhaust outlet 1021 and the reflux port according to the acquired operation mode, and controlling the on-off of the first flow path and the second flow path.

According to the technical scheme, after the operation modes of the fresh air conditioner are obtained, the opening and closing of each air port and the on-off of the first flow path and the second flow path are controlled to realize the targeted operation of different operation modes, and the system is simple to control.

When the operation mode is the dehumidification mode, the fresh air inlet 1011, the exhaust air outlet 1021 and the return air inlet are controlled to be all opened, the first flow path and the second flow path are controlled to be all communicated, and further, when the operation mode comprises the first throttling element 41, the second throttling element 42 and the third throttling element 43, the first throttling element 41, the second throttling element 42 and the third throttling element 43 are controlled to be in a throttling state.

Referring specifically to fig. 2, in this mode, the solenoid valves (i.e., the aforementioned shut-off valves, hereinafter the same) are all opened, and the electronic expansion valves (i.e., the aforementioned throttling elements, systems) are all controlled; the fresh air and return air are adopted, the fresh air valve 71 is opened, the exhaust air valve 72 is closed, the return air valve 73 is opened, and the fresh air fan 103 and the exhaust air fan 104 are both opened;

the system flow is as follows: the high-temperature and high-pressure refrigerant discharged from the compressor 3 flows to the outdoor side heat exchanger 24 through the four-way reversing valve 6, the refrigerant condensed by the outdoor side heat exchanger 24 is divided into two paths, the first path (namely a first flow path and the same as the next path) is throttled and depressurized for the first time through the first throttling element 41, and enters the first heat exchanger 21 (the refrigerant in the second heat exchanger is in a medium-pressure and medium-temperature state) to exchange heat with air, so that the air is heated and sent into a room, and the direct sending of dehumidified cold air into the room is avoided, thereby improving the comfort; the refrigerant is throttled and depressurized by the second throttling element 42, and evaporated and absorbs heat in the third heat exchanger 23. Then flows to the intermediate heat exchanger 25, exchanges heat with the other path (namely the second flow path, the same as the second flow path) of refrigerant in the intermediate heat exchanger 25, absorbs the heat of the other path of refrigerant, and then is converged with the other path of refrigerant through the third cut-off valve 53; the other path of refrigerant from the outdoor side heat exchanger 24 passes through the intermediate heat exchanger 25, is cooled again by the refrigerant flowing through the third heat exchanger 23, is subjected to supercooling treatment, is throttled by the third throttling element 43, is evaporated in the second heat exchanger 22 to absorb heat, is converged with the other path of refrigerant, and is sucked by the compressor 3 through the four-way reversing valve 6 to complete one cycle.

In this mode, the indoor temperature is high, humidity is also high, after the exhaust fan and the return air valve 73 are opened, the indoor return air is dehumidified and cooled twice through the third heat exchanger 23 and the second heat exchanger 22 successively, so that the indoor return air can be dehumidified quickly, and is mixed with fresh air entering the indoor space and then passes through the first heat exchanger 21, and the dehumidified low-temperature air is reheated by using a medium-pressure refrigerant, so that the dehumidified cold air is prevented from being directly fed into the indoor space, and the comfort is improved.

If the air outlet temperature of the unit is to be adjusted, the air outlet temperature of the unit can be adjusted by adjusting the medium pressure temperature of the first heat exchanger 21, the medium pressure temperature passing through the first heat exchanger 21 can be controlled by the compressor frequency and the first throttling element 41, when the medium pressure temperature needs to be increased, the first throttling element 41 can be increased or the compressor frequency can be increased, and when the medium pressure temperature needs to be reduced, the first throttling element 41 can be turned off or the compressor frequency can be reduced. The dehumidification temperatures of the third heat exchanger 23 and the second heat exchanger 22 can control the evaporation temperature tz=tl-a ℃ (a is a set difference value, which can be 5 ℃, TL is a dew point temperature) of the refrigerant through the second throttling element 42 and the third throttling element 43 respectively Meanwhile, the refrigerant expanded and evaporated in the third heat exchanger 23 can be passed through the intermediate heat exchanger 25 to be sub-cooled, so that the refrigerant in the second heat exchanger 22 has a lower evaporation temperature.

In some embodiments, when the operation mode is a dehumidification heating mode, the fresh air inlet 1011 and the exhaust air outlet 1021 are controlled to be opened, the reflux port is controlled to be closed, and the first flow path is controlled to be communicated and the second flow path is controlled to be blocked.

Referring specifically to fig. 3, in this mode, the second shut-off valve 52 is closed and the first shut-off valve 51 is closed; fresh air and exhaust air are adopted, a fresh air valve 71 is opened, an exhaust air valve 72 is opened, a return air valve 73 is closed, and a fresh air fan 103 and an exhaust air fan 104 are both opened;

the system flow is as follows: the high-temperature and high-pressure refrigerant discharged from the compressor 3 flows to the outdoor side heat exchanger 24 through the four-way reversing valve 6 to be condensed, enters the first heat exchanger 21 to emit heat after being throttled by the first throttling element 41, enters the third heat exchanger 23 to evaporate and absorb heat after being throttled by the second throttling element 42, and then passes through the intermediate heat exchanger 25, and the third cut-off valve 53 is sucked by the compressor 3 through the four-way reversing valve 6 to complete one cycle.

As can be seen by referring to the flowchart of fig. 6 in combination, in this mode, the indoor temperature is low, but the humidity is high, so that the outdoor air is introduced into the room, the indoor low-temperature high-humidity air is discharged to the outside, and the indoor humidity is reduced while the air is discharged. In this mode, the temperature of the refrigerant passing through the first throttling element 41 is the medium pressure temperature after being throttled once, and the refrigerant entering the first heat exchanger can be used for heating fresh air and then is sent into a room; the refrigerant throttled by the second throttling element 42 recycles the heat in the exhaust air in the third heat exchanger 23; the fresh air supply temperature control, that is, the control of the medium pressure temperature is realized by adjusting the first throttling element 41 or the compressor frequency, when the temperature is lower, the compressor frequency is increased or the first throttling element 41 is opened, and when the temperature is higher, the first throttling element 41 is closed or the compressor frequency is reduced.

When the fresh air conditioner further comprises a four-way reversing valve 6 and the operation mode is a refrigeration mode, controlling the four-way reversing valve 6 to be in a refrigeration state, controlling the fresh air inlet 1011 and the exhaust outlet 1021 to be closed and the reflux port to be opened, and controlling the second flow path to be communicated and the first flow path to be cut off;

referring specifically to fig. 4, in this mode, the first throttle element 41 is closed and the third shutoff valve 53 is closed; the fresh air valve 71 is closed, the exhaust air valve 72 is closed, the return air valve 73 is opened, the fresh air fan 103 is opened, and the exhaust fan 104 is closed;

the system flow is as follows: the high-temperature and high-pressure refrigerant discharged from the compressor 3 flows to the outdoor side heat exchanger 24 through the four-way reversing valve 6 to be condensed, flows to the intermediate heat exchanger 25, enters the second heat exchanger 22 to be evaporated and absorbed heat after being throttled by the third throttling element 43, exchanges heat with return air, takes away air heat, cools the air, and then flows through the four-way reversing valve 6 again to be sucked by the compressor 3 to complete one cycle.

In this mode, return air is adopted, the indoor temperature is higher, the humidity is lower, the system controls the evaporating temperature tz=f (TL, tw, RH%) of the second heat exchanger 22 by adjusting the third throttling element 43 (the formula is an empirical formula obtained by testing), so as to ensure that the temperature is reduced without reducing the humidity while the temperature is reduced, and meanwhile, the indoor temperature can be quickly reduced to reach the set temperature by adopting a return air mode.

Or alternatively, the process may be performed,

when the fresh air conditioner further comprises a four-way reversing valve 6 and the operation mode is a heating mode, the four-way reversing valve 6 is controlled to be in a heating state, the fresh air inlet 1011 and the air outlet 1021 are controlled to be closed, the reflux port is controlled to be opened, and the second flow path is controlled to be communicated and the first flow path is controlled to be cut off.

Referring specifically to fig. 5, in this mode, the first throttle element 41 is closed and the third shutoff valve 53 is closed; the four-way reversing valve 6 reverses; the return air is adopted, the fresh air valve 71 is closed, the exhaust air valve 72 is closed, the return air valve 73 is opened, the fresh air fan 103 is opened, and the exhaust fan 104 is closed; the high-temperature high-pressure gas discharged from the compressor 3 flows into the second heat exchanger 22 through the four-way reversing valve 6, exchanges heat with air, enters the intermediate heat exchanger 25 after being throttled by the third throttling element 43, is absorbed by the compressor through the four-way reversing valve 6 after being evaporated and absorbed by the outdoor heat exchanger 24, and completes one cycle.

The air supply temperature in the mode is mainly regulated by the compressor frequency, when Tw is less than Ts-T1 ℃ (T1 is the set deviation temperature, the range is 0-2 ℃ and 1 ℃ can be taken), the compressor frequency is increased, and when Tw is more than Ts-T1 ℃, the compressor frequency is reduced. Humidity is controlled by the humidifying part 8; the humidification member 8 is turned on when the humidity is insufficient, and the humidification member 8 is turned off when the humidity is high.

It can be understood that the dehumidifying mode, the dehumidifying and heating mode, the refrigerating mode and the heating mode of the fresh air conditioner are adopted, and the refrigerant flow direction of the heating mode is opposite to that of the other three operation modes. In terms of acquiring instructions of related operation modes, the mode switching can be specifically realized by adopting a manual selection manner, and of course, in order to improve the intelligent degree of the fresh air conditioner, the operation of the system can also acquire corresponding temperature and humidity parameters, such as indoor temperature Tw, indoor relative humidity RH and corresponding set values Ts, RH1, etc., through corresponding sensors, such as an air outlet temperature sensor 91, an indoor temperature and humidity sensor 92, and an outdoor temperature and humidity sensor 93, which are compared with the intelligent switching operation modes, as shown in fig. 6 and 7.

The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the application. The foregoing is merely a preferred embodiment of the present application, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present application, and these modifications and variations should also be regarded as the scope of the application.

Claims (12)

1. The fresh air conditioner comprises an inner machine module which is arranged corresponding to the indoor space and comprises an inner machine shell (1), and is characterized in that,

a partition plate (11) arranged in the inner casing (1) separates an inner space of the inner casing (1) to form a fresh air channel (101) and an exhaust channel (102), the fresh air channel (101) is provided with a fresh air inlet (1011) which is selectively communicated with an external environment and a fresh air outlet (1012) which is selectively communicated with an indoor space, the exhaust channel (102) is provided with an exhaust outlet (1021) which is selectively communicated with the external environment and an exhaust inlet (1022) which is selectively communicated with the indoor space, the fresh air channel (101) is provided with a first heat exchanger (21) and a second heat exchanger (22) which is positioned on the air inlet side of the first heat exchanger (21), wherein the first heat exchanger (21) is close to the fresh air outlet (1012), a third heat exchanger (23) is arranged in the exhaust channel (102), a backflow port is arranged on the partition plate (11), the backflow port is used for communicating the air inlet side space of the second heat exchanger (22) with the air outlet side space of the third heat exchanger (23), the backflow port also comprises a first heat exchanger (24), a first heat exchanger (25), a second heat exchanger (25) and an intermediate heat exchanger (25) which are connected in series with the first heat exchanger and the first heat exchanger (25) and the intermediate heat exchanger (25), the second heat exchange flow channel in the intermediate heat exchanger (25) and the second heat exchanger (22) are connected in series to form a second flow channel, the first flow channel is connected in parallel with the second flow channel, the first end of the first flow channel is communicated with one side, far away from the exhaust port of the compressor (3), of the outdoor side heat exchanger (24), and the second end of the first flow channel and the second end of the second flow channel can be communicated with the air suction port of the compressor (3).

2. Fresh air conditioner according to claim 1, wherein the first flow path is further connected in series with a first throttling element (41) and a second throttling element (42), the first throttling element (41) being located between the outdoor side heat exchanger (24) and the first heat exchanger (21), the second throttling element (42) being located between the first heat exchanger (21) and the third heat exchanger (23).

3. The fresh air conditioner according to claim 2, wherein,

a third throttling element (43) is also connected in series in the second flow path, and the third throttling element (43) is positioned between the intermediate heat exchanger (25) and the second heat exchanger (22).

4. The fresh air conditioner according to claim 1, wherein,

the first flow path is also connected with a third cut-off valve (53) in series, the third cut-off valve (53) is positioned on one side, far away from the third heat exchanger (23), of the intermediate heat exchanger (25), the second flow path is also connected with a second cut-off valve (52) and a first cut-off valve (51) in series, wherein the second cut-off valve (52) is positioned on a pipe section, close to the outdoor side heat exchanger (24), of the second flow path, and the first cut-off valve (51) is positioned on a pipe section, close to an air suction port of the compressor (3), of the second flow path.

5. The fresh air conditioner according to any one of claims 1 to 4, further comprising a four-way reversing valve (6), wherein a first port of the four-way reversing valve (6) communicates with an exhaust port of the compressor (3), a second port communicates with a first end of the outdoor side heat exchanger (24), a third port communicates with an intake port of the compressor (3), and a fourth port communicates with second ends of the first and second flow paths connected in parallel.

6. Fresh air conditioner according to claim 1, characterized in that a fresh air valve (71) is arranged in the fresh air inlet (1011), an air exhaust valve (72) is arranged in the air exhaust outlet (1021), and a return air valve (73) is arranged in the return port.

7. Fresh air conditioner according to claim 1, characterized in that a humidifying component (8) is further arranged in the fresh air channel (101), and the humidifying component (8) is positioned on the air outlet side of the first heat exchanger (21).

8. A control method of a fresh air conditioner according to any one of claims 1 to 7, comprising the steps of:

acquiring an operation mode of the fresh air conditioner;

and controlling the opening and closing of the fresh air inlet (1011), the exhaust outlet (1021) and the reflux port according to the acquired operation mode, and controlling the on-off of the first flow path and the second flow path.

9. The control method according to claim 8, wherein,

when the operation mode is a dehumidification mode, the fresh air inlet (1011), the exhaust outlet (1021) and the reflux port are controlled to be all opened, and the first flow path and the second flow path are controlled to be communicated.

10. The control method according to claim 9, wherein,

when the first throttling element (41), the second throttling element (42) and the third throttling element (43) are included, the first throttling element (41), the second throttling element (42) and the third throttling element (43) are controlled to be in a throttling state.

11. The control method according to claim 8, wherein,

when the operation mode is a dehumidification heating mode, the fresh air inlet (1011) and the exhaust air outlet (1021) are controlled to be opened, the reflux port is controlled to be closed, and the first flow path is controlled to be communicated and the second flow path is controlled to be cut off.

12. The control method according to claim 8, wherein,

when the fresh air conditioner further comprises a four-way reversing valve (6) and the operation mode is a refrigeration mode, controlling the four-way reversing valve (6) to be in a refrigeration state, controlling the fresh air inlet (1011) and the air outlet (1021) to be closed and the reflux port to be opened, and controlling the second flow path to be communicated and the first flow path to be cut off; or alternatively, the process may be performed,

when the fresh air conditioner further comprises a four-way reversing valve (6) and the operation mode is a heating mode, the four-way reversing valve (6) is controlled to be in a heating state, the fresh air inlet (1011) and the air outlet (1021) are controlled to be closed, the backflow port is controlled to be opened, the second flow path is controlled to be communicated, and the first flow path is controlled to be cut off.