Fresh air conditioning system

Abstract

This application relates to the field of air conditioning equipment technology, and discloses a fresh air conditioning system. The fresh air conditioning system includes a compressor, a system four-way valve, an outdoor heat exchanger, and an indoor heat exchange assembly. The indoor heat exchange assembly includes a reheat heat exchanger and a dehumidification heat exchanger, with a dehumidification valve disposed between the reheat heat exchanger and the dehumidification heat exchanger. The reheat heat exchanger includes: a first heat exchange section with a first heat exchange capacity; a second heat exchange section with a second heat exchange capacity, disposed below the first heat exchange section, with the second heat exchange capacity being greater than the first heat exchange capacity; and a third heat exchange section with a third heat exchange capacity, disposed below the second heat exchange section, with the second heat exchange capacity being greater than the third heat exchange capacity. The first, second, and third heat exchange sections are connected in parallel. The fresh air conditioning system provided in this embodiment regulates the air temperature during dehumidification, improving the user experience.

Description

Technical Field

[0001] This application relates to the field of air conditioning equipment technology, such as a fresh air conditioning system. Background Technology

[0002] A fresh air conditioning system is a key environmental treatment device for users' indoor spaces. It includes major structural components such as a compressor, outdoor heat exchanger, throttling device, and indoor heat exchanger, and can regulate the ambient temperature and humidity in users' indoor spaces.

[0003] However, in daily life, weather conditions are often complex, such as the humid spring season when temperatures are low but humidity is high. Under these conditions, users generally need to reduce indoor humidity without changing the indoor temperature. However, existing fresh air conditioning systems have limited ability to simultaneously regulate humidity and temperature. While reducing humidity, the temperature may become too low or too high, affecting comfort during dehumidification and reducing the user experience.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0006] This disclosure provides a fresh air conditioning system that can regulate air temperature while adjusting air humidity, thereby improving the user experience.

[0007] In some embodiments, the fresh air conditioning system includes a compressor, a system four-way valve, an outdoor heat exchanger, and an indoor heat exchange assembly. The indoor heat exchange assembly includes a reheat heat exchanger and a dehumidification heat exchanger, with a dehumidification valve provided between the reheat heat exchanger and the dehumidification heat exchanger. The reheat heat exchanger includes: a first heat exchange section having a first heat exchange capacity; a second heat exchange section having a second heat exchange capacity, the second heat exchange section being disposed below the first heat exchange section, and the second heat exchange capacity being greater than the first heat exchange capacity; and a third heat exchange section having a third heat exchange capacity, the third heat exchange section being disposed below the second heat exchange section, and the second heat exchange capacity being greater than the third heat exchange capacity. The first heat exchange section, the second heat exchange section, and the third heat exchange section are arranged in parallel.

[0008] In some alternative embodiments, the first heat exchange section includes a plurality of first heat exchange tubes, each first heat exchange tube including a first tube body and a first internal thread extending spirally along the first inner wall of the first tube body; the second heat exchange section includes a plurality of second heat exchange tubes, each second heat exchange tube including a second tube body and a first internal thread, a second internal thread, and a third internal thread extending spirally along the second inner wall of the second tube body in sequence; the third heat exchange section includes a plurality of third heat exchange tubes, each third heat exchange tube including a third tube body and a first internal thread and a second internal thread extending spirally along the third inner wall of the third tube body, wherein the first internal thread has a first shape, the second internal thread has a second shape, and the third internal thread has a third shape, and the first shape, the second shape, and the third shape are all different.

[0009] In some optional embodiments, in the first heat exchange section, the tooth height of the first internal thread is a first tooth height H1, and the tooth root width of the first internal thread is a first width K1, wherein the first tooth height H1 is 0.11 to 0.13 mm, and the first width K1 is 0.11 to 0.12 mm.

[0010] In some optional embodiments, in the second heat exchange section, the tooth height of the first internal thread is a first tooth height H1, the tooth height of the second internal thread is a first tooth height H2, the tooth height of the third internal thread is a third tooth height H3, the root width of the first internal thread is a first width K1, the root width of the second internal thread is a second width K2, the root width of the third internal thread is a third width K3, the pitch of the first internal thread and the second internal thread is a first pitch P1, and the pitch of the second internal thread and the third internal thread is a second pitch P1. The pitch P2 is as follows: the first tooth height H1 is 0.11-0.13 mm, the second tooth height H2 is 0.14-0.16 mm, the third tooth height is 0.11-0.13 mm, the first width K1 is 0.11-0.12 mm, the second width K2 is 0.13-0.15 mm, the third width K3 is 0.12-0.13 mm, the first pitch P1 is 0.18-0.22 mm, and the second pitch P2 is 0.24-0.26 mm.

[0011] In some optional embodiments, in the third heat exchange section, the tooth height of the first internal thread is a first tooth height H1, the tooth height of the second internal thread is a first tooth height H2, the root width of the first internal thread is a first width K1, the root width of the second internal thread is a second width K2, and the pitch of the first internal thread and the second internal thread is a first pitch P1. The first tooth height H1 is 0.11–0.13 mm, the second tooth height H2 is 0.14–0.16 mm, the first width K1 is 0.11–0.12 mm, the second width K2 is 0.13–0.15 mm, and the first pitch P1 is 0.18–0.22 mm.

[0012] In some optional embodiments, the indoor heat exchange assembly further includes a heat recovery heat exchanger, and the fresh air conditioning system further includes a control unit configured to cause the high-pressure refrigerant discharged from the compressor to flow into the reheat heat exchanger for reheating after passing through the system four-way valve, the outdoor heat exchanger, and the heat recovery heat exchanger, and then into the dehumidification heat exchanger for dehumidification after passing through the dehumidification valve, and then back to the compressor, so that the fresh air conditioning system operates in a constant temperature dehumidification mode. When the fresh air conditioning system operates in a constant temperature dehumidification mode, the opening degree of the dehumidification valve is adjusted to a first opening degree, and the first heat exchanger, the second heat exchanger, and the third heat exchanger are all controlled to be open. The indoor return air exchanges heat with the dehumidification heat exchanger and the reheat heat exchanger in sequence to obtain air with a first outlet air temperature, so that the fresh air conditioning system operates in the first constant temperature dehumidification stage; the opening degree of the dehumidification valve is adjusted to a second opening degree, and the first heat exchanger and the second heat exchanger are controlled to be open, and the third heat exchanger is controlled to be open. The heat exchange section is closed, and the indoor return air exchanges heat with the dehumidifying heat exchanger and the reheat heat exchanger in sequence to obtain air with a second outlet air temperature, so that the fresh air air conditioning system operates in the second constant temperature dehumidification stage, wherein the second opening degree is greater than the first opening degree; the opening degree of the dehumidifying valve is adjusted to the third opening degree, and the second heat exchange section is controlled to be open, while the first heat exchange section and the third heat exchange section are controlled to be closed, and the indoor return air exchanges heat with the dehumidifying heat exchanger and the reheat heat exchanger in sequence to obtain air with a third outlet air temperature, so that the fresh air air conditioning system operates in the third constant temperature dehumidification stage, wherein the third opening degree is greater than the second opening degree; wherein the temperature difference between the first outlet air temperature and the target temperature is less than or equal to the first difference threshold, the temperature difference between the second outlet air temperature and the target temperature is less than or equal to the first difference threshold, and the temperature difference between the third outlet air temperature and the target temperature is less than or equal to the first difference threshold.

[0013] In some optional embodiments, the fresh air conditioning system further includes: an indoor shell forming a accommodating cavity, a partition being provided within the accommodating cavity, the partition dividing the accommodating cavity into a first chamber and a second chamber, a reheat heat exchanger and a dehumidifying heat exchanger being disposed in the first chamber, and a heat recovery heat exchanger being disposed in the second chamber, the indoor shell also including a first side plate portion near the dehumidifying heat exchanger, the partition including a first partition section having a first return air inlet and a second partition section having a second return air inlet, and the first chamber including a first cavity portion between the first side plate portion and the dehumidifying heat exchanger and a second cavity portion between the dehumidifying heat exchanger and the reheat heat exchanger, wherein the first partition section corresponds to the first cavity portion, and the second partition section corresponds to the second cavity portion.

[0014] In some optional embodiments, the control unit is further configured to: control the opening of the first return air vent and control the closing of the second return air vent when the fresh air conditioning system is operating in the first constant temperature dehumidification stage, so that the indoor return air of the second chamber enters the first chamber through the first return air vent; when the fresh air conditioning system is operating in the second constant temperature dehumidification stage or the third constant temperature dehumidification stage, control the opening of the first return air vent and the second return air vent, so that the first part of the return air of the second chamber enters the first chamber through the first return air vent, and the first part of the return air exchanges heat with the dehumidification heat exchanger to obtain the first dry air; and allow the second part of the return air of the second chamber to enter the first chamber through the second return air vent, and the first dry air mixes with the second part of the return air before flowing through the reheat heat exchanger.

[0015] In some alternative embodiments, an air duct is provided at the second return air inlet toward the first chamber, and the air duct is used to adjust the air outlet speed at the second return air inlet.

[0016] In some optional embodiments, the induced draft duct includes: a first induced draft duct plate disposed at the first air outlet end of the second return air inlet near the reheat heat exchanger, the first induced draft duct plate including a first arc-shaped induced draft section and a first flat induced draft section connected in sequence; and a second induced draft duct plate disposed at the second air outlet end of the second return air inlet near the dehumidification heat exchanger, the second induced draft duct plate including a second arc-shaped induced draft section and a second flat induced draft section connected in sequence, wherein a first air guiding element is disposed at the first connection point between the first arc-shaped induced draft section and the first flat induced draft section, and a second air guiding element is disposed at the second connection point between the second arc-shaped induced draft section and the second flat induced draft section.

[0017] In some optional embodiments, the first arc-shaped air intake section and the second arc-shaped air intake section form a first air intake end near the second return air inlet and a second air intake end away from the second return air inlet, wherein the cross-sectional area formed by the first arc-shaped air intake section and the second arc-shaped air intake section gradually decreases from the first air intake end to the second air intake end; the first flat plate air intake section and the second flat plate air intake section form a third air intake end near the arc-shaped air intake section and a fourth air intake end away from the arc-shaped air intake section, wherein the cross-sectional area formed by the first flat plate air intake section and the second flat plate air intake section gradually increases from the third air intake end to the fourth air intake end.

[0018] In some optional embodiments, the control unit is further configured to: when the fresh air conditioning system is operating in the second constant temperature and dehumidification stage, control the first free end of the first air guide element and the second free end of the second air guide element to form a first air guide area; when the fresh air conditioning system is operating in the third constant temperature and dehumidification stage, control the first free end of the first air guide element and the second free end of the second air guide element to form a second air guide area, wherein the first air guide area is smaller than the second air guide area.

[0019] The fresh air conditioning system provided in this disclosure can achieve the following technical effects:

[0020] The fresh air conditioning system provided in this embodiment includes a reheat heat exchanger comprising a first heat exchange section, a second heat exchange section, and a third heat exchange section. The second heat exchange capacity of the second heat exchange section is greater than the first heat exchange capacity of the first heat exchange section, and the second heat exchange capacity of the second heat exchange section is greater than the third heat exchange capacity of the third heat exchange section. Thus, when the fresh air conditioning system operates in dehumidification mode, at least one of the first, second, and third heat exchange sections of the reheat heat exchanger can be selectively activated, causing the reheat heat exchanger to exhibit different reheat capacities as a whole. This, in turn, regulates the outlet temperature of the fresh air conditioning system during dehumidification, meeting the user's temperature regulation needs during dehumidification.

[0021] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0022] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are considered similar elements. The drawings do not constitute a limitation of scale, and wherein:

[0023] Figure 1 This is a schematic diagram of the first fresh air conditioning system provided in the embodiments of this disclosure;

[0024] Figure 2 This is a schematic diagram of the first indoor heat exchange component provided in an embodiment of this disclosure;

[0025] Figure 3 This is a schematic diagram of the second indoor heat exchange component provided in an embodiment of this disclosure;

[0026] Figure 4 This is a schematic diagram of the structure of the first heat exchange tube provided in an embodiment of this disclosure;

[0027] Figure 5 yes Figure 4 The first enlarged image of the selected portion;

[0028] Figure 6 yes Figure 4 The second enlarged image of the selected portion;

[0029] Figure 7 This is a schematic diagram of the structure of the second heat exchange tube provided in an embodiment of this disclosure;

[0030] Figure 8 yes Figure 7 The first enlarged image of the selected portion;

[0031] Figure 9 yes Figure 7 The second enlarged image of the selected portion;

[0032] Figure 10 yes Figure 7 The third enlarged image of the selected portion;

[0033] Figure 11 This is a schematic diagram of the structure of the third heat exchange tube provided in an embodiment of this disclosure;

[0034] Figure 12 yes Figure 11 The first enlarged image of the selected portion;

[0035] Figure 13 yes Figure 11 The second enlarged image of the selected portion;

[0036] Figure 14 This is a schematic diagram of the third indoor heat exchange component provided in an embodiment of this disclosure;

[0037] Figure 15 This is a schematic diagram of the fourth indoor heat exchange component provided in an embodiment of this disclosure;

[0038] Figure 16 This is a schematic diagram of the fifth indoor heat exchange component provided in an embodiment of this disclosure;

[0039] Figure 17 This is a schematic diagram of the second fresh air conditioning system provided in the embodiments of this disclosure;

[0040] Figure 18 This is a schematic diagram of the third fresh air conditioning system provided in the embodiments of this disclosure;

[0041] Figure 19 This is a schematic diagram of the fourth fresh air conditioning system provided in the embodiments of this disclosure;

[0042] Figure 20 This is a schematic diagram of the sixth indoor heat exchange component provided in an embodiment of this disclosure;

[0043] Figure 21 This is a schematic diagram of the seventh indoor heat exchange component provided in an embodiment of this disclosure;

[0044] Figure 22 This is a schematic diagram of the eighth indoor heat exchange component provided in an embodiment of this disclosure;

[0045] Figure 23 This is a schematic diagram of the ninth indoor heat exchange component provided in an embodiment of this disclosure;

[0046] Figure 24 This is a schematic diagram of the tenth indoor heat exchange component provided in an embodiment of this disclosure;

[0047] Figure 25 This is a schematic diagram of a multi-way valve body assembly provided in an embodiment of this disclosure.

[0048] Figure label:

[0049] 1: Compressor; 2: System four-way valve; 3: Outdoor heat exchanger; 41: Reheat heat exchanger; 42: Dehumidifier heat exchanger; 43: Heat recovery heat exchanger; 44: Dehumidifier valve; 45: First throttle valve; 46: Second throttle valve; 411: First heat exchange section; 412: Second heat exchange section; 413: Third heat exchange section; 421: First dehumidifier section; 422: Second dehumidifier section; 423: Third dehumidifier section; 4111: First heat exchange tube; 4121: Second heat exchange tube; 4131: Third heat exchange tube; 5: Multi-way valve body assembly; 501: First pipeline connection position; 502: Second pipeline connection position; 503: Third pipeline connection position; 504: Fourth pipeline connection position; 61: First fan; 62: Second fan; 71: Filter element; 72: Wet film; 81: First internal thread; 82: Second internal thread; 83: Third internal thread; 9: Indoor shell; 91: First chamber; 911: First side plate; 92: Second chamber; 93: Partition; 931: First return air outlet; 932: Second return air outlet; 9321: First air outlet end; 9322: Second air outlet end; 941: First arc-shaped air intake section; 942: First flat air intake section; 943: Second arc-shaped air intake section; 944: Second flat air intake section; 945: First air guide element; 946: Second air guide element; 9451: First free end; 9461: Second free end. Detailed Implementation

[0050] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0051] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0052] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0053] Furthermore, the terms "setup," "connection," and "installation" should be interpreted broadly. For example, "connection" can refer to an installation connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can refer to the internal communication between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0054] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0055] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0056] Figure 1 This is a schematic diagram of a fresh air conditioning system provided in an embodiment of this disclosure.

[0057] like Figure 1 As shown, the fresh air conditioning system includes a compressor 1, a system four-way valve 2, an outdoor heat exchanger 3, and an indoor heat exchange assembly. The indoor heat exchange assembly includes a reheat heat exchanger 41 and a dehumidifying heat exchanger 42. A dehumidifying valve 44 is provided between the reheat heat exchanger 41 and the dehumidifying heat exchanger 42. The reheat heat exchanger 41 includes a first heat exchange section 411, a second heat exchange section 412, and a third heat exchange section 413. The first heat exchange section 411 has a first heat exchange capacity, the second heat exchange section 412 has a second heat exchange capacity, and the second heat exchange section 412 is located below the first heat exchange section 411. The second heat exchange capacity is greater than the first heat exchange capacity. The third heat exchange section 413 has a third heat exchange capacity, and the third heat exchange section 413 is located below the second heat exchange section 412. The second heat exchange capacity is greater than the third heat exchange capacity. The first heat exchange section 411, the second heat exchange section 412, and the third heat exchange section 413 are connected in parallel.

[0058] The fresh air conditioning system provided in this embodiment includes an indoor heat exchange component comprising a dehumidifying heat exchanger 42 and a reheating heat exchanger 41, wherein a dehumidifying valve 44 is provided between the reheating heat exchanger 41 and the dehumidifying heat exchanger 42. When the fresh air conditioning system operates in dehumidification mode, the dehumidifying heat exchanger 42 performs dehumidification to regulate air humidity, and the reheating heat exchanger 41 is used to reheat the dehumidified air.

[0059] The reheat heat exchanger 41 includes a first heat exchange section 411, a second heat exchange section 412, and a third heat exchange section 413 arranged in parallel. The second heat exchange capacity of the second heat exchange section 412 is greater than the first heat exchange capacity of the first heat exchange section 411, and also greater than the third heat exchange capacity of the third heat exchange section 413. In this way, at least one of the first heat exchange section 411, the second heat exchange section 412, and the third heat exchange section 413 of the reheat heat exchanger 41 can be selectively activated to adjust the reheating capacity of the reheat heat exchanger 41 for dehumidified air, thereby regulating the outlet air temperature of the fresh air conditioning system during the dehumidification process and improving user comfort. Figure 2 and Figure 3 As shown.

[0060] Optionally, the heat exchange area of ​​the dehumidifying heat exchanger 42 is equal to that of the reheat heat exchanger 41.

[0061] Optionally, the dehumidifier heat exchanger 42 includes a first dehumidification section 421, a second dehumidification section 422, and a third dehumidification section 423. The first dehumidification section 421 corresponds to the first heat exchange section 411, the second dehumidification section 422 corresponds to the second heat exchange section 412, and the third dehumidification section 423 corresponds to the third heat exchange section 413. "Corresponding" can be understood as meaning that along the direction of airflow, the air flowing through the first dehumidification section 421 continues to flow through the first heat exchange section 411; similarly, the air flowing through the second dehumidification section 422 continues to flow through the second heat exchange section 412, and the air flowing through the third dehumidification section 423 continues to flow through the third heat exchange section 413. Figure 14 As shown.

[0062] Optionally, the first heat exchange section 411 includes a plurality of first heat exchange tubes 4111, each first heat exchange tube 4111 including a first tube body and a first internal thread 81 spirally extending along the first inner wall of the first tube body. The second heat exchange section 412 includes a plurality of second heat exchange tubes 4121, each second heat exchange tube 4121 including a second tube body and a first internal thread 81, a second internal thread 82, and a third internal thread 83 spirally extending sequentially along the second inner wall of the second tube body. The third heat exchange section 413 includes a plurality of third heat exchange tubes 4131, each third heat exchange tube 4131 including a third tube body and a first internal thread 81 and a second internal thread 82 spirally extending along the third inner wall of the third tube body. The first internal thread 81 has a first shape, the second internal thread 82 has a second shape, and the third internal thread 83 has a third shape, and the first, second, and third shapes are all different. Figures 4 to 13 As shown.

[0063] Assuming that the inner diameter, length, and number of heat exchange tubes in the first heat exchange section 411, the second heat exchange section 412, and the third heat exchange section 413 are all the same, the heat exchange capacity of different heat exchange sections can be adjusted by designing the shape of the internal threads on the inner walls of the first heat exchange tube 4111, the second heat exchange tube 4121, and the third heat exchange tube 4131. In this way, the reheat heat exchanger 41 can have different heat exchange capacities while maintaining its original size, which is beneficial for the miniaturization of the fresh air conditioning system.

[0064] The first shape, the second shape, and the third shape can be different in that they have different external shapes, or they can have the same external shape but different sizes. Optionally, the longitudinal cross-sections of the first shape, the second shape, and the third shape can be various shapes such as single wave, boss shape, and multi-tooth shape.

[0065] Optionally, in the second inner wall of the second heat exchange tube 4121, a first internal thread 81, a second internal thread 82 and a third internal thread 83 are sequentially arranged, so that the three internal threads with different shapes form a thread combination with stable heat exchange capacity, thereby improving the heat exchange capacity and heat exchange stability between the inner wall of the second heat exchange tube 4121 of the second heat exchange section 412 and the refrigerant.

[0066] Optionally, in the third inner wall of the third heat exchange tube 4131, the second internal thread 82 is disposed between two adjacent first internal threads 81. In this way, the first internal threads 81 and the second internal threads 82 with different shapes are alternately disposed, so that the first internal threads 81 and the second internal threads 82 can form a thread combination with stable heat exchange capacity, thereby improving the heat exchange capacity and heat exchange stability between the inner wall of the third heat exchange tube 4131 of the third heat exchange section 413 and the refrigerant.

[0067] Optionally, in the first heat exchange tube 4111, the second heat exchange tube 4121 and the third heat exchange tube 4131, the top of the cross-section of the first internal thread 81 is arc-shaped.

[0068] Optionally, in the second heat exchange tube 4121 and the third heat exchange tube 4131, the cross-sectional shape of the second internal thread 82 is a boss shape.

[0069] Optionally, in the second heat exchange tube 4121, the cross-sectional shape of the third internal thread 83 is multi-toothed.

[0070] Optionally, the bodies of the first heat exchange tube 4111, the second heat exchange tube 4121, and the third heat exchange tube 4131 are made of aluminum. Multiple internal threads of different shapes can be pre-machined onto an aluminum plate, and then the aluminum plate with the various internal thread shapes can be bent into a tubular shape and connected using a high-frequency welding process to obtain the aluminum heat exchange tube. This improves the production efficiency of the heat exchange tube and solves the problem of performance constraints caused by process limitations.

[0071] Optionally, the outer diameter of the tube body of the first heat exchange tube 4111, the second heat exchange tube 4121 and the third heat exchange tube 4131 can be 5mm, 6mm, 7mm, 8mm, 9mm or 10mm.

[0072] Optionally, in the first heat exchange tube 4111, the second heat exchange tube 4121, and the third heat exchange tube 4131, the first tooth height H1 of the first internal thread 81 is 0.11 to 0.13 mm, for example, H1 can be 0.11 mm, 0.12 mm, or 0.13 mm. In the second heat exchange tube 4121 and the third heat exchange tube 4131, the second tooth height H2 of the second internal thread 82 is 0.14 to 0.16 mm, for example, H2 can be 0.14 mm, 0.15 mm, or 0.16 mm. In the second heat exchange tube 4121, the third tooth height H3 of the third internal thread 83 is 0.11 to 0.13 mm, for example, H3 can be 0.11 mm, 0.12 mm, or 0.13 mm.

[0073] In the second heat exchange tube 4121, the tooth height of the second internal thread 82 located in the middle is greater than the tooth height of the first internal thread 81 and the third internal thread 83 located on both sides. This makes the inner wall of the second heat exchange tube 4121 form a low-high-low thread arrangement, which improves the heat exchange capacity of the second heat exchange tube 4121.

[0074] Optionally, in the first heat exchange tube 4111, the second heat exchange tube 4121, and the third heat exchange tube 4131, the first width K1 of the first internal thread 81 is 0.11 to 0.12 mm, for example, K1 can be 0.11 mm or 0.12 mm; in the second heat exchange tube 4121 and the third heat exchange tube 4131, the second width K2 of the second internal thread 82 is 0.13 to 0.15 mm, for example, K2 can be 0.13 mm, 0.14 mm, or 0.15 mm; in the second heat exchange tube 4121, the third width K3 of the third internal thread 83 is 0.12 to 0.13 mm, for example, K3 can be 0.12 mm or 0.13 mm.

[0075] In the second heat exchange tube 4121, the tooth root width of the second internal thread 82 located in the middle is greater than the tooth root width of the first internal thread 81 and the third internal thread 83 located on both sides. This makes the inner wall of the second heat exchange tube 4121 form a thread arrangement that can be narrow, wide, or narrow, thereby improving the heat exchange capacity of the second heat exchange tube 4121.

[0076] Optionally, the pitch of the first internal thread 81 and the second internal thread 82 is the first pitch P1, and the pitch of the second internal thread 82 and the third internal thread 83 is the second pitch P2, wherein the first pitch P1 is 0.18 to 0.22 mm, and the second pitch P2 is 0.24 to 0.26 mm.

[0077] In the second heat exchange tube 4121 and the third heat exchange tube 4131, the first pitch P1 can be 0.18mm, 0.19mm, 0.20mm, 0.21mm or 0.22mm; in the second heat exchange tube 4121, the second pitch P2 can be 0.24mm, 0.25mm or 0.26mm.

[0078] Optionally, the total height of the reheat heat exchanger 41 and the dehumidification heat exchanger 42 is Y. Optionally, the height of the first heat exchange section 411, the second heat exchange section 412 and the third heat exchange section 413 is 1 / 3Y; or, the height of the first heat exchange section 411 and the third heat exchange section 413 is 1 / 4Y and the height of the second heat exchange section 412 is 1 / 2Y.

[0079] Optionally, the indoor heat exchange component also includes a heat recovery heat exchanger 43, and the fresh air conditioning system also includes a control unit, which is configured to cause the high-pressure refrigerant discharged from the compressor 1 to flow into the reheat heat exchanger 41 for reheating after passing through the system four-way valve 2, the outdoor heat exchanger 3 and the heat recovery heat exchanger 43, and then flow into the dehumidification heat exchanger 42 for dehumidification after passing through the dehumidification valve 44, and then flow back to the compressor 1, so that the fresh air conditioning system operates in a constant temperature dehumidification mode.

[0080] The refrigerant flow path of a fresh air conditioning system in constant temperature and dehumidification mode is as follows: Figure 17As shown. A first throttling valve 45 is installed between the outdoor heat exchanger 3 and the heat recovery heat exchanger 43, and a second throttling valve 46 is installed between the heat recovery heat exchanger 43 and the multi-way valve assembly 5. When operating the constant temperature dehumidification mode, the first throttling valve 45 and the second throttling valve 46 are fully open, with no throttling, and the opening of the dehumidification valve 44 is adjusted. The refrigerant in the dehumidification heat exchanger 42 is a low-temperature refrigerant that has been throttled and cooled by the dehumidification valve 44, which performs the dehumidification function. The refrigerant in the reheat heat exchanger 41 is a high-temperature refrigerant, which reheats the dehumidified low-temperature air.

[0081] When the fresh air conditioning system operates in constant temperature dehumidification mode, the opening of the dehumidification valve 44 is adjusted to the first opening degree, and the first heat exchange section 411, the second heat exchange section 412, and the third heat exchange section 413 are all connected. The indoor return air exchanges heat with the dehumidification heat exchanger 42 and the reheat heat exchanger 41 in sequence to obtain air with the first outlet air temperature, so that the fresh air conditioning system operates in the first constant temperature dehumidification stage. The opening of the dehumidification valve 44 is adjusted to the second opening degree, and the first heat exchange section 411 and the second heat exchange section 412 are connected, while the third heat exchange section 413 is closed. The indoor return air exchanges heat with the dehumidification heat exchanger 42 and the reheat heat exchanger 41 in sequence to obtain air with the second outlet air temperature, so that the fresh air conditioning system operates in the second constant temperature dehumidification stage. The second opening degree is greater than the first opening degree; the opening degree of the dehumidification valve 44 is adjusted to the third opening degree, and the second heat exchange section 412 is controlled to be open, while the first heat exchange section 411 and the third heat exchange section 413 are controlled to be closed. The indoor return air exchanges heat with the dehumidification heat exchanger 42 and the reheat heat exchanger 41 in sequence to obtain air with the third outlet air temperature, so that the fresh air air conditioning system operates in the third constant temperature dehumidification stage, wherein the third opening degree is greater than the second opening degree; wherein the temperature difference between the first outlet air temperature and the target temperature is less than or equal to the first difference threshold, the temperature difference between the second outlet air temperature and the target temperature is less than or equal to the first difference threshold, and the temperature difference between the third outlet air temperature and the target temperature is less than or equal to the first difference threshold.

[0082] During the dehumidification process of the fresh air conditioning system, the indoor humidity decreases. To achieve faster dehumidification and maintain a constant outlet air temperature throughout the dehumidification process, the opening of the dehumidification valve 44 is generally controlled to its minimum. However, as the dehumidification process continues, the humidity in the user's indoor environment gradually decreases. If the opening of the dehumidification valve 44 remains at its minimum, significant fluctuations in indoor humidity can easily occur, causing discomfort to the user.

[0083] This disclosure provides a gradient dehumidification process in a constant temperature dehumidification process, including a first constant temperature dehumidification stage, a second constant temperature dehumidification stage, and a third constant temperature dehumidification stage.

[0084] The first constant-temperature dehumidification stage can be a rapid dehumidification stage. During this stage, the dehumidification valve 44 is at its first opening degree, which is the minimum opening degree throughout the entire constant-temperature dehumidification process. This stage can quickly remove most of the excess moisture from the user's indoor environment in the shortest possible time. Matching the dehumidification capacity of the dehumidification heat exchanger 42 in this stage, the first heat exchange section 411, the second heat exchange section 412, and the third heat exchange section 413 of the reheat heat exchanger 41 are all connected, ensuring that the outlet air temperature of the fresh air conditioning system is the first outlet air temperature. Figure 14 As shown.

[0085] The second constant-temperature dehumidification stage can be a smooth transition stage, ensuring that the outlet humidity of the fresh air conditioning system steadily approaches the target humidity. In this stage, the opening of the dehumidification valve 44 is adjusted to a second opening degree, which is greater than the first opening degree. Matching the dehumidification capacity of the dehumidification heat exchanger 42 in this stage, the first heat exchange section 411 and the second heat exchange section 412 of the reheat heat exchanger 41 are activated, while the third heat exchange section 413 is closed, ensuring that the outlet air temperature of the fresh air conditioning system is the second outlet air temperature, and that the difference between the second and first outlet air temperatures is not significant. Figure 15 As shown.

[0086] The third constant-temperature dehumidification stage is the precise humidity control stage. That is, when the outlet air humidity is close to the target humidity, the dehumidification capacity of the dehumidification heat exchanger 42 is further reduced until the outlet air humidity reaches the target humidity, avoiding problems such as dry air caused by excessively low outlet air humidity. In this third constant-temperature dehumidification stage, the opening degree of the dehumidification valve 44 is adjusted to the third opening degree, which is greater than the second opening degree. Matching the dehumidification capacity of the dehumidification heat exchanger 42 in this stage, the second heat exchange section 412 of the reheat heat exchanger 41 is turned on, while the first heat exchange section 411 and the third heat exchange section 413 are closed, ensuring that the outlet air temperature of the fresh air conditioning system is the third outlet air temperature, and that the difference between the third outlet air temperature and the second outlet air temperature is not significant. Figure 16 As shown.

[0087] Optionally, the first difference threshold is 1-2℃. It can be seen that in the fresh air conditioning system provided in this embodiment, the dehumidification heat exchanger 42 can perform gradient dehumidification by adjusting the opening of the dehumidification valve 44. Simultaneously, selectively activating at least one of the first heat exchange section 411, the second heat exchange section 412, and the third heat exchange section 413 of the reheat heat exchanger 41 ensures that the outlet air temperature of the fresh air conditioning system remains close to the target temperature during the gradient dehumidification process, thus improving the comfort of the constant temperature dehumidification process.

[0088] In Embodiment 1, the reheat heat exchanger 41 includes a first heat exchange section 411, a second heat exchange section 412, and a third heat exchange section 413 arranged in parallel. The first inner wall of the first heat exchange tube 4111 of the first heat exchange section 411 has a first internal thread 81, wherein the first tooth height H1 of the first internal thread 81 is 0.11 mm, and the first width K1 of the first internal thread 81 is 0.11 mm. The second inner wall of the second heat exchange tube 4121 of the second heat exchange section 412 has a first internal thread 81, a second internal thread 82 and a third internal thread 83. The first tooth height H1 of the first internal thread 81 is 0.11 mm, the second tooth height H2 of the second internal thread 82 is 0.15 mm, the third tooth height H3 of the third internal thread 83 is 0.11 mm, the first width K1 of the first internal thread 81 is 0.11 mm, the second width K2 of the second internal thread 82 is 0.15 mm, the third width K3 of the third internal thread 83 is 0.12 mm, the first pitch P1 of the first internal thread 81 and the second internal thread 82 is 0.18 mm, and the second pitch P2 of the second internal thread 82 and the third internal thread 83 is 0.25 mm. The third inner wall of the third heat exchange tube 4131 of the third heat exchange section 413 has a first internal thread 81 and a second internal thread 82. The first tooth height H1 of the first internal thread 81 is 0.11 mm, the second tooth height H2 of the second internal thread 82 is 0.15 mm, the first width K1 of the first internal thread 81 is 0.11 mm, the second width K2 of the second internal thread 82 is 0.15 mm, and the first pitch P1 of the first internal thread 81 and the second internal thread 82 is 0.18 mm.

[0089] Comparative Example 1, the reheat heat exchanger 41 includes a first heat exchange section 411, a second heat exchange section 412, and a third heat exchange section 413 arranged in parallel. The inner walls of the heat exchange tubes of the first heat exchange section 411, the second heat exchange section 412, and the third heat exchange section 413 are only provided with a first internal thread 81. The first tooth height and the first width of the first internal thread 81 are the same as those in Example 1.

[0090] It is understood that the opening degree of the dehumidification valve 44 in the first, second and third constant temperature dehumidification stages of Example 1 is as described above, and the opening degree of the dehumidification valve 44 in the corresponding constant temperature dehumidification stages of Comparative Example 1 is the same as that in Example 1.

[0091] In Example 1, the on / off states of the three heat exchange sections of the reheat heat exchanger 41 in the first, second, and third constant temperature dehumidification stages are as described above. In Comparative Example 1, the on / off states of the three heat exchange sections of the reheat heat exchanger 41 in the corresponding constant temperature dehumidification stages are the same as in Example 1.

[0092] Table 1 shows the outlet temperature and humidity at different stages under the constant temperature dehumidification mode of Example 1 and Comparative Example 1.

[0093] Table 1

[0094]

[0095] Taking an initial indoor temperature of 20℃ and initial humidity of 80% as an example, the target temperature of the constant temperature dehumidification mode is 24℃ and the target humidity is 55%, with the humidity at the end of the first constant temperature dehumidification stage being 65% and the humidity at the end of the second constant temperature dehumidification stage being 60%. As can be seen from Table 1, by adjusting the opening of the dehumidification valve 44, both Example 1 and Comparative Example 1 can achieve a gradual decrease in humidity during the first, second, and third constant temperature dehumidification stages.

[0096] In the first constant-temperature dehumidification stage, in Example 1, the reheat heat exchanger 41 with three different heat exchange capacities has a better reheating effect on the dehumidified air, with an outlet temperature of 22°C. In contrast, the reheat heat exchanger 41 in Comparative Example 1 has a relatively poor reheating capacity, with an outlet temperature of 18°C. In the second constant-temperature dehumidification stage, the outlet temperature of Example 1 is 23.7°C, close to the target temperature, while the outlet temperature of Comparative Example 1 continues to decrease to 16°C. In the third constant-temperature dehumidification stage, the outlet temperature of Example 1 is 24.3°C, also close to the target temperature, while the outlet temperature of Comparative Example 1 continues to decrease to 15°C, bringing a noticeable cooling sensation to the user.

[0097] In Comparative Example 2, the reheat heat exchanger 41 is not divided into heat exchange sections. During the first, second, and third constant-temperature dehumidification stages of the constant-temperature dehumidification mode, the entire reheat heat exchanger 41 performs a reheating function. The opening degree of the dehumidification valve 44 in Comparative Example 2 is the same as in Example 1 at the corresponding different stages of constant-temperature dehumidification.

[0098] In Comparative Example 2, gradient dehumidification can also be achieved by adjusting the opening of the dehumidification valve 44 to change the dehumidification capacity of the dehumidification heat exchanger 42. However, since the heat exchange capacity of the reheat heat exchanger 41 remains unchanged, the outlet temperature gradually increases, and even in the third constant-temperature dehumidification stage, the outlet temperature can approach 27°C, bringing a feeling of heat to the user.

[0099] As can be seen, the fresh air conditioning system provided in this embodiment can achieve gradient dehumidification when running in constant temperature dehumidification mode. Furthermore, during the overall constant temperature dehumidification stage, the temperature of the air outlet remains constant and close to the user's target temperature, thus improving the user experience.

[0100] Optionally, the fresh air conditioning system also includes an indoor shell 9, which encloses a cavity. A partition 93 is provided within the cavity, dividing it into a first chamber 91 and a second chamber 92. A reheat heat exchanger 41 and a dehumidification heat exchanger 42 are located in the first chamber 91, and a heat recovery heat exchanger 43 is located in the second chamber 92. The indoor shell 9 also includes a first side plate portion 911 near the dehumidification heat exchanger 42. The partition 93 includes a first partition section with a first return air inlet 931 and a second partition section with a second return air inlet 932. The first chamber 91 includes a first cavity between the first side plate portion 911 and the dehumidification heat exchanger 42, and a second cavity between the dehumidification heat exchanger 43 and the reheat heat exchanger 41. The first partition section corresponds to the first cavity, and the second partition section corresponds to the second cavity. Figure 19 As shown.

[0101] Optionally, the first chamber 91 is provided with a first fan 61, and the second chamber 92 is provided with a second fan 62.

[0102] When the first return air vent 931 is opened, the indoor return air from the second chamber 92 can enter the first chamber 91 through the first return air vent 931, and flow sequentially through the dehumidification heat exchanger 42 and the reheat heat exchanger 41 for dehumidification and reheating. When the second return air vent 932 is opened, the indoor return air from the second chamber 92 can enter the first chamber 91 through the second return air vent 932 and flow only through the reheat heat exchanger 41. In this way, the second return air vent 932 can be selectively opened to compensate for the outlet air temperature of the fresh air conditioning system, which is beneficial to keep the outlet air temperature close to the target temperature during the constant temperature dehumidification process.

[0103] Optionally, a first damper is provided at the first return air outlet 931, and the first damper can be opened or closed in a controlled manner to open or close the first return air outlet 931; similarly, a second damper is provided at the second return air outlet 932, and the second damper can be opened or closed in a controlled manner to open or close the second return air outlet 932.

[0104] Optionally, the control unit is further configured to: when the fresh air conditioning system is operating in the first constant temperature dehumidification stage, control the first return air vent 931 to open and control the second return air vent 932 to close, so that the indoor return air of the second chamber 92 enters the first chamber 91 through the first return air vent 931; when the fresh air conditioning system is operating in the second constant temperature dehumidification stage or the third constant temperature dehumidification stage, control the first return air vent 931 and the second return air vent 932 to open, so that the first part of the return air of the second chamber 92 enters the first chamber 91 through the first return air vent 931, and the first part of the return air exchanges heat with the dehumidification heat exchanger 42 to obtain the first dry air; so that the second part of the return air of the second chamber 92 enters the first chamber 91 through the second return air vent 932, and the first dry air mixes with the second part of the return air before flowing through the reheat heat exchanger 41.

[0105] During the first constant temperature and dehumidification stage, the first return air vent 931 is opened and the second return air vent 932 is closed, so that the indoor return air of the second chamber 92 enters the first chamber 91 only through the first return air vent 931.

[0106] Taking a target air outlet temperature of 24℃ and a first difference threshold of 2℃ as an example, during the second constant temperature dehumidification stage, the second air outlet temperature of the fresh air conditioning system can be obtained. If the second air outlet temperature is lower than the target temperature, and the temperature difference between the second air outlet temperature and the target temperature is greater than the first difference threshold, then the second return air vent 932 is controlled to open to compensate for the temperature of the air outlet. For example, when the second air outlet temperature is obtained as 21℃, the second return air vent 932 can be controlled to open.

[0107] Similarly, during the third constant temperature dehumidification stage, the third outlet air temperature of the fresh air conditioning system can be obtained. If the temperature difference between the third outlet air temperature and the target temperature is greater than the first difference threshold, the second return air vent 932 is controlled to open to compensate for the outlet air temperature. For example, when the third outlet air temperature is obtained as 21.5℃, the second return air vent 932 can be controlled to open.

[0108] Optionally, an air duct is provided at the second return air inlet 932, pointing towards the first chamber 91. The air duct is used to adjust the air outlet velocity at the second return air inlet 932. Figures 20 to 24 As shown.

[0109] The third heat exchange section 413 of the reheat heat exchanger 41 is located near the partition 93. The induced draft duct can adjust the outlet air velocity of the indoor return air at the second return air inlet 932, thereby adjusting the air delivery distance of the indoor return air at the second return air inlet 932. When the first heat exchange section 411 and the second heat exchange section 412 of the reheat heat exchanger 41 are connected, the outlet air velocity at the second return air inlet 932 can be controlled to be larger, so that the indoor return air through the second return air inlet 932 can be delivered to the more distant first heat exchange section 411 and the second heat exchange section 412. When the second heat exchange section 412 of the reheat heat exchanger 41 is connected and the first heat exchange section 411 and the third heat exchange section 413 are closed, the outlet air velocity at the second return air inlet 932 can be controlled to be smaller, so that the indoor return air through the second return air inlet 932 can be delivered only to the second heat exchange section 412. In this embodiment of the present disclosure, the airflow velocity at the second return air inlet 932 can be adjusted to precisely deliver the indoor return air at the second return air inlet 932 to different heat exchange sections of the reheat heat exchanger 41, thereby achieving precise temperature compensation.

[0110] Optionally, the induced draft duct includes a first induced draft duct plate and a second induced draft duct plate. The first induced draft duct plate is disposed at the first air outlet end 9321 of the second return air outlet 932 near the reheat heat exchanger 41. The first induced draft duct plate includes a first arc-shaped induced draft section 941 and a first flat induced draft section 942 connected in sequence. The second induced draft duct plate is disposed at the second air outlet end 9322 of the second return air outlet 932 near the dehumidification heat exchanger 42. The second induced draft duct plate includes a second arc-shaped induced draft section 943 and a second flat induced draft section 944 connected in sequence. A first air guide element 945 is disposed at the first connection between the first arc-shaped induced draft section 941 and the first flat induced draft section 942, and a second air guide element 946 is disposed at the second connection between the second arc-shaped induced draft section 943 and the second flat induced draft section 944.

[0111] The first arc-shaped air-guiding section 941 and the second arc-shaped air-guiding section 943 form an arc-shaped air-guiding duct near the second return air inlet 932, thereby increasing the initial air volume at the second return air inlet 932. The first air-guiding element 945 is rotatably disposed at the first connection, and the second air-guiding element 946 is rotatably disposed at the second connection. By adjusting the rotation angle of the first air-guiding element 945 and the second air-guiding element 946, the air outlet area and air outlet direction formed by the first air-guiding element 945 and the second air-guiding element 946 can be adjusted.

[0112] Optionally, if the first rotating end of the first air guiding element 945 is located at the first connection, then the other end of the first air guiding element 945 is the first free end 9451; similarly, if the second rotating end of the second air guiding element 946 is located at the second connection, then the other end of the second air guiding element 946 is the second free end 9461.

[0113] Optionally, the first arc-shaped air intake section 941 and the second arc-shaped air intake section 943 form a first air intake end near the second return air inlet 932 and a second air intake end away from the second return air inlet 932, wherein the cross-sectional area formed by the first arc-shaped air intake section 941 and the second arc-shaped air intake section 943 gradually decreases from the first air intake end to the second air intake end; the first flat plate air intake section 942 and the second flat plate air intake section 944 form a third air intake end near the arc-shaped air intake section and a fourth air intake end away from the arc-shaped air intake section, wherein the cross-sectional area formed by the first flat plate air intake section 942 and the second flat plate air intake section 944 gradually increases from the third air intake end to the fourth air intake end.

[0114] The cross-sectional area formed by the two arc-shaped air intake sections gradually decreases, while the cross-sectional area formed by the two flat air intake sections gradually increases, resulting in an air intake duct that roughly tapers in the middle. For example... Figure 20As shown. In this way, the airflow at the second return air inlet 932 can be concentrated at the second air intake end, which is beneficial for the first air guide element 945 and the second air guide element 946 to regulate the airflow from the second return air inlet 932. It can be understood that the cross-sectional area formed by the first arc-shaped air intake section 941 and the second arc-shaped air intake section 943 is the cross-sectional area perpendicular to the airflow direction in the air intake duct; similarly, the cross-sectional area formed by the first flat plate air intake section 942 and the second flat plate air intake section 944 is also the cross-sectional area perpendicular to the airflow direction in the air intake duct. Wherein, the airflow direction is as follows... Figure 20 The arrow direction is shown. Optionally, the second and third air intake ends may overlap.

[0115] Optionally, the control unit is further configured to: when the fresh air conditioning system is operating in the second constant temperature and dehumidification stage, control the first free end 9451 of the first air guide element 945 and the second free end 9461 of the second air guide element 946 to form a first air guide area S3; when the fresh air conditioning system is operating in the third constant temperature and dehumidification stage, control the first free end 9451 of the first air guide element 945 and the second free end 9461 of the second air guide element 946 to form a second air guide area S1, wherein the first air guide area S3 is smaller than the second air guide area S1.

[0116] When the fresh air conditioning system operates in the second constant temperature dehumidification stage, the first air guiding area S3 formed by the first free end 9451 and the second free end 9461 is relatively small. This results in a concentrated airflow effect at the first free end 9451 and the second free end 9461, increasing the airflow velocity in the induced draft duct. This allows the air from the second return air outlet 932 to be delivered to the first heat exchange section 411 and the second heat exchange section 412, improving the mixing effect of the first dry air and the second return air. Figure 23 As shown.

[0117] When the fresh air conditioning system is operating in the third constant temperature and dehumidification stage, the second air guiding area S1 formed by the first free end 9451 and the second free end 9461 is relatively large. This results in an expanded air outlet effect at the first free end 9451 and the second free end 9461, causing most of the air outlet from the second return air vent 932 to be sent to the second heat exchange section 412, thus improving the mixing effect of the first dry air and the second portion of the return air. Figure 21 As shown.

[0118] Optionally, when both the first air guiding element 945 and the second air guiding element 946 are in a vertical state, the air guiding area formed by the first air guiding element 945 and the second air guiding element 946 is the initial air guiding area S2, such as... Figure 22 As shown in the figure. Among them, the first air guiding area S3 is smaller than the initial air guiding area, and the second air guiding area S1 is larger than the initial air guiding area S2.

[0119] Optionally, during the second constant temperature dehumidification stage, if the second outlet air temperature is lower than the target temperature, and the temperature difference between the second outlet air temperature and the target temperature is greater than the first difference threshold and less than the second difference threshold, then the first air guide element 945 and the second air guide element 946 are controlled to outlet air towards the third heat exchange section 413; if the temperature difference between the second outlet air temperature and the target temperature is greater than the second difference threshold and less than the third difference threshold, then the first air guide element 945 and the second air guide element 946 are controlled to outlet air between the reheat heat exchanger 41 and the dehumidification heat exchanger 42, and the first air guide area S3 is made smaller than the initial air guide area.

[0120] For example, the target temperature can be 24℃, the first difference threshold is 2℃, the second difference threshold is 3℃, and the third difference threshold is 4℃. If the second outlet air temperature is 21.5℃, it is considered that the required compensation temperature is not significant. In this case, the first air guide element 945 and the second air guide element 946 are controlled to direct the airflow towards the third heat exchange section 413, which does not have a reheating function. This ensures that the air from the second return air vent 932 does not undergo heating by the reheat heat exchanger, thus providing a lower degree of compensation for the current temperature and bringing the second outlet air temperature closer to the target temperature. Figure 24 As shown.

[0121] If the second outlet air temperature is 20.5℃, it is considered that the required compensation temperature is too high. In this case, the first air guide element 945 and the second air guide element 946 are controlled to direct the airflow between the reheat heat exchanger 41 and the dehumidification heat exchanger 42, so that the air from the second return air inlet 932 is reheated by the reheat heat exchanger, thus compensating for the current temperature to a higher degree, making the second outlet air temperature close to the target temperature. Figure 23 As shown.

[0122] Optionally, during the third constant temperature dehumidification stage, if the third outlet air temperature is lower than the target temperature, and the temperature difference between the third outlet air temperature and the target temperature is greater than the first difference threshold and less than the second difference threshold, then the first air guide element 945 and the second air guide element 946 are controlled to outlet air towards the third heat exchange section 413; if the temperature difference between the third outlet air temperature and the target temperature is greater than the second difference threshold and less than the third difference threshold, then the first air guide element 945 and the second air guide element 946 are controlled to outlet air between the reheat heat exchanger 41 and the dehumidification heat exchanger 42, and the second air guide area S1 is made smaller than the initial air guide area.

[0123] For example, the target temperature can be 24℃, the first difference threshold is 2℃, the second difference threshold is 3℃, and the third difference threshold is 4℃. If the third outlet air temperature is 21.5℃, it is considered that the required compensation temperature is not significant. In this case, the first air guide element 945 and the second air guide element 946 are controlled to direct the airflow towards the third heat exchange section 413, which does not have a reheating function. This ensures that the air from the second return air vent 932 does not undergo heating by the reheat heat exchanger, thus providing a lower degree of compensation for the current temperature, making the third outlet air temperature closer to the target temperature. Figure 24 As shown.

[0124] If the third outlet air temperature is 20.5℃, it is considered that the current required compensation temperature is too high. At this time, the first air guide element 945 and the second air guide element 946 are controlled to outlet air between the reheat heat exchanger 41 and the dehumidification heat exchanger 42, so that the air from the second return air inlet 932 is reheated by the reheat heat exchanger 41, and the current temperature is compensated to a higher degree, so that the third outlet air temperature is close to the target temperature.

[0125] Optionally, the fresh air conditioning system provided in this disclosure embodiment can also operate in reheat dehumidification mode. For example... Figure 18 As shown.

[0126] Optionally, the fresh air conditioning system also includes a multi-way valve body assembly 5, which is provided with a first pipe connection position 501, a second pipe connection position 502, a third pipe connection position 503, and a fourth pipe connection position 504. For example... Figure 25 As shown.

[0127] The multi-way valve assembly 5 has four pipe connections: the first connection point 501 connects to the system four-way valve 2; the second connection point 502 connects to the reheat heat exchanger 41; the third connection point 503 connects to the dehumidification heat exchanger 42; and the fourth connection point 504 connects to the heat recovery heat exchanger 43. Regardless of whether the system is in cooling, heating, temperature-raising dehumidification, or constant-temperature dehumidification mode, the refrigerant enters the indoor dehumidification heat exchanger from the second pipe connection point 502 and exits through the third pipe connection point 503. This improves the stability of refrigerant flow within the indoor dehumidification heat exchanger, thereby enhancing the stability of the indoor dehumidification heat exchanger's temperature and humidity regulation of the user's indoor environment. Optionally, the multi-way valve assembly 5 includes four one-way valves.

[0128] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A fresh air conditioning system, characterized by, The system comprises a compressor (1), a system four-way valve (2), an outdoor heat exchanger (3), and an indoor heat exchanger assembly, which comprises a reheating heat exchanger (41) and a dehumidifying heat exchanger (42), and a dehumidifying valve (44) is arranged between the reheating heat exchanger (41) and the dehumidifying heat exchanger (42), wherein the reheating heat exchanger (41) comprises: a first heat exchange part (411) having a first heat exchange capacity; a second heat exchange part (412) having a second heat exchange capacity, which is arranged at a lower part of the first heat exchange part (411), and the second heat exchange capacity is greater than the first heat exchange capacity; and a third heat exchange part (413) having a third heat exchange capacity, which is arranged at a lower part of the second heat exchange part (412), and the second heat exchange capacity is greater than the third heat exchange capacity, wherein the first heat exchange part (411), the second heat exchange part (412), and the third heat exchange part (413) are arranged in parallel, the first heat exchange part (411) comprises a plurality of first heat exchange pipes (4111), each of which comprises a first pipe body and a first internal thread (81) spirally extending along a first inner wall of the first pipe body; the second heat exchange part (412) comprises a plurality of second heat exchange pipes (4121), each of which comprises a second pipe body and the first internal thread (81), a second internal thread (82), and a third internal thread (83) spirally extending along a second inner wall of the second pipe body in sequence, the third heat exchange part (413) comprises a plurality of third heat exchange pipes (4131), each of which comprises a third pipe body and the first internal thread (81) and the second internal thread (82) spirally extending along a third inner wall of the third pipe body, wherein the first internal thread (81) has a first shape, the second internal thread (82) has a second shape, the third internal thread (83) has a third shape, and the first shape, the second shape, and the third shape are all different, the inner diameters, lengths, and numbers of the heat exchange pipes of the first heat exchange part (411), the second heat exchange part (412), and the third heat exchange part (413) are all the same.

2. The fresh air conditioning system according to claim 1, wherein in the first heat exchange part (411), a tooth height of the first internal thread (81) is a first tooth height H1, and a tooth bottom width of the first internal thread (81) is a first width K1, wherein the first tooth height H1 is 0.11-0.13 mm, and the first width K1 is 0.11-0.12 mm; and / or, In the second heat exchange part (412), the tooth height of the first internal thread (81) is a first tooth height H1, the tooth height of the second internal thread (82) is a second tooth height H2, the tooth height of the third internal thread (83) is a third tooth height H3, the tooth bottom width of the first internal thread (81) is a first width K1, the tooth bottom width of the second internal thread (82) is a second width K2, the tooth bottom width of the third internal thread (83) is a third width K3, the pitch of the first internal thread (81) and the second internal thread (82) is a first pitch P1, the pitch of the second internal thread (82) and the third internal thread (83) is a second pitch P2, wherein the first tooth height H1 is 0.11-0.13 mm, the second tooth height H2 is 0.14-0.16 mm, the third tooth height is 0.11-0.13 mm, the first width K1 is 0.11-0.12 mm, the second width K2 is 0.13-0.15 mm, the third width K3 is 0.12-0.13 mm, the first pitch P1 is 0.18-0.22 mm, and the second pitch P2 is 0.24-0.26 mm; and / or, In the third heat exchange part (413), the tooth height of the first internal thread (81) is a first tooth height H1, the tooth height of the second internal thread (82) is a first tooth height H2, the tooth bottom width of the first internal thread (81) is a first width K1, the tooth bottom width of the second internal thread (82) is a second width K2, and the pitch of the first internal thread (81) and the second internal thread (82) is a first pitch P1, wherein the first tooth height H1 is 0.11-0.13 mm, the second tooth height H2 is 0.14-0.16 mm, the first width K1 is 0.11-0.12 mm, the second width K2 is 0.13-0.15 mm, and the first pitch P1 is 0.18-0.22 mm.

3. The fresh air conditioning system according to claim 1 or 2, characterized in that, The indoor heat exchange assembly further comprises a heat recovery heat exchanger (43), The fresh air air conditioning system further comprises a control unit configured to make the high-pressure refrigerant discharged by the compressor (1) flow into the reheating heat exchanger (41) for reheating after passing through the system four-way valve (2), the outdoor heat exchanger (3), and the heat recovery heat exchanger (43), flow into the dehumidifying heat exchanger (42) for dehumidification after passing through the dehumidifying valve (44), and then flow back to the compressor (1), so that the fresh air air conditioning system operates in a constant temperature dehumidification mode, When the fresh air air conditioning system operates in the constant temperature dehumidification mode, the opening degree of the dehumidifying valve (44) is adjusted to a first opening degree, and the first heat exchange part (411), the second heat exchange part (412), and the third heat exchange part (413) are all controlled to be in conduction, so that the indoor return air is sequentially heat-exchanged with the dehumidifying heat exchanger (42) and the reheating heat exchanger (41) to obtain air with a first outlet air temperature, so that the fresh air air conditioning system operates in a first constant temperature dehumidification stage. adjust the opening degree of the dehumidification valve (44) to a second opening degree, control the first heat exchange part (411) and the second heat exchange part (412) to be in conduction, and control the third heat exchange part (413) to be closed, so that indoor return air is heat-exchanged with the dehumidification heat exchanger (42) and the reheating heat exchanger (41) in sequence to obtain air with a second outlet air temperature, so as to make the fresh air air conditioning system run a second constant temperature dehumidification phase, wherein the second opening degree is greater than the first opening degree; adjust the opening degree of the dehumidification valve (44) to a third opening degree, control the second heat exchange part (412) to be in conduction, and control the first heat exchange part (411) and the third heat exchange part (413) to be closed, so that indoor return air is heat-exchanged with the dehumidification heat exchanger (42) and the reheating heat exchanger (41) in sequence to obtain air with a third outlet air temperature, so as to make the fresh air air conditioning system run a third constant temperature dehumidification phase, wherein the third opening degree is greater than the second opening degree; wherein a temperature difference between the first outlet air temperature and the target temperature is less than or equal to a first difference threshold value, a temperature difference between the second outlet air temperature and the target temperature is less than or equal to the first difference threshold value, and a temperature difference between the third outlet air temperature and the target temperature is less than or equal to the first difference threshold value.

4. The fresh air conditioning system of claim 3, wherein, Further comprising: an indoor housing (9) enclosing a containing cavity, a partition plate (93) is arranged in the containing cavity, the partition plate (93) divides the containing cavity into a first chamber (91) and a second chamber (92), the reheating heat exchanger (41) and the dehumidification heat exchanger (42) are arranged in the first chamber (91), and the heat recovery heat exchanger (43) is arranged in the second chamber (92), the indoor housing (9) further comprises a first side plate part (911) close to the dehumidification heat exchanger (42), the partition plate (93) comprises a first partition plate segment provided with a first return air opening (931) and a second partition plate segment provided with a second return air opening (932), and the first chamber (91) comprises a first cavity part between the first side plate part (911) and the dehumidification heat exchanger (42) and a second cavity part between the dehumidification heat exchanger (42) and the reheating heat exchanger (41), wherein the first partition plate segment corresponds to the first cavity part, and the second partition plate segment corresponds to the second cavity part.

5. The fresh air conditioning system of claim 4, wherein, The control part is further configured to: when the fresh air air conditioning system runs the first constant temperature dehumidification phase, control the first return air opening (931) to be opened and the second return air opening (932) to be closed, so that indoor return air in the second chamber (92) enters the first chamber (91) through the first return air opening (931); When the fresh air conditioning system operates the second constant temperature dehumidification stage or the third constant temperature dehumidification stage, the first return air outlet (931) and the second return air outlet (932) are controlled to be opened, so that the first part of the return air in the second chamber (92) enters the first chamber (91) through the first return air outlet (931), and the first dry air is obtained after the first part of the return air exchanges heat with the dehumidification heat exchanger (42); the second part of the return air in the second chamber (92) enters the first chamber (91) through the second return air outlet (932), and the first dry air and the second part of the return air are mixed and then flow through the reheating heat exchanger (41).

6. The fresh air conditioning system of claim 5, wherein, a return air guide duct towards the first chamber (91) is arranged at the second return air outlet (932), and the return air guide duct is used to adjust the air outlet speed at the second return air outlet (932).

7. The fresh air conditioning system of claim 6, wherein, The return air guide duct comprises: a first return air guide duct plate arranged at a first air outlet end (9321) of the second return air outlet (932) close to the reheating heat exchanger (41), the first return air guide duct plate comprising a first arc-shaped return air guide section (941) and a first flat plate return air guide section (942) arranged in sequence; and a second return air guide duct plate arranged at a second air outlet end (9322) of the second return air outlet (932) close to the dehumidification heat exchanger (42), the second return air guide duct plate comprising a second arc-shaped return air guide section (943) and a second flat plate return air guide section (944) arranged in sequence, wherein a first air guide element (945) is arranged at a first connection position between the first arc-shaped return air guide section (941) and the first flat plate return air guide section (942), and a second air guide element (946) is arranged at a second connection position between the second arc-shaped return air guide section (943) and the second flat plate return air guide section (944).

8. The fresh air conditioning system of claim 7, wherein, the first arc-shaped return air guide section (941) and the second arc-shaped return air guide section (943) form a cross-sectional area that gradually decreases from a first return air guide end close to the second return air outlet (932) to a second return air guide end away from the second return air outlet (932); the first flat plate return air guide section (942) and the second flat plate return air guide section (944) form a third return air guide end close to the arc-shaped return air guide section and a fourth return air guide end away from the arc-shaped return air guide section, and the cross-sectional area formed by the first flat plate return air guide section (942) and the second flat plate return air guide section (944) gradually increases from the third return air guide end to the fourth return air guide end.

9. The fresh air conditioning system of claim 8, wherein, The control unit is further configured to: When the fresh air conditioning system operates a second constant temperature dehumidification stage, a first free end (9451) of the first air guide element (945) and a second free end (9461) of the second air guide element (946) form a first air guide area, and when the fresh air conditioning system operates a third constant temperature dehumidification stage, the first free end (9451) of the first air guide element (945) and the second free end (9461) of the second air guide element (946) form a second air guide area, Wherein the first air guide area is smaller than the second air guide area.

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