Flow path structure, air conditioner system, and control method

Abstract

The application provides a flow path structure, an air conditioner system and a control method, and comprises: an outdoor unit having a water supply pipeline; an indoor unit connected with the water supply pipeline; the indoor unit comprises a heat exchange pipeline, so that the fluid in the water supply pipeline enters the heat exchange pipeline after passing through the indoor unit; a proportional three-way valve, an inlet of the proportional three-way valve being connected with the heat exchange pipeline; a heat exchange component, the heat exchange component being arranged at intervals with the indoor unit; a water distribution pipeline, one end of the water distribution pipeline being connected with one outlet of the proportional three-way valve, and the other end of the water distribution pipeline being connected with the heat exchange component; a control module, the control module being connected with the proportional three-way valve, so as to control the flow of the fluid in the water distribution pipeline and the return pipeline through the proportional three-way valve; and a temperature sensor, the temperature sensor being located between the indoor unit and the heat exchange component, and the temperature sensor being signal-connected with the control module, so that the technical problem of low heating efficiency of the air conditioner system in the related art is solved.

Description

Technical Field

[0001] This invention relates to the field of multi-split air conditioning technology, specifically to a flow path structure, an air conditioning system, and a control method. Background Technology

[0002] A water-cooled multi-split air conditioning system mainly consists of an outdoor unit connected to multiple indoor units and underfloor heating coils. When both indoor units and underfloor heating coils are heating simultaneously, the outdoor unit supplies water at a constant temperature, resulting in both indoor units and underfloor heating coils using high-temperature water for heating. Prolonged use of high-temperature water for heating the underfloor heating coils will reduce their lifespan. Furthermore, under normal conditions, when both indoor units and underfloor heating coils are heating simultaneously, heat exchange mainly occurs through convection within the indoor units. This causes heat to concentrate at the top of the room and not directly benefit the human body, leading to energy waste.

[0003] Therefore, existing technologies need further development. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and provide a flow path structure, an air conditioning system and a control method to solve the technical problem of low heating efficiency in air conditioning systems in related technologies.

[0005] To achieve the above technical objectives, the present invention adopts the following technical solution: A flow path structure is provided, comprising: an outdoor unit having a water supply pipe; an indoor unit connected to the water supply pipe; the indoor unit including a heat exchange pipe, so that fluid in the water supply pipe passes through the indoor unit and enters the heat exchange pipe; a proportional three-way valve, the inlet of which is connected to the heat exchange pipe; a heat exchange component located below the indoor unit, spaced apart from the indoor unit; a water distribution pipe, one end of which is connected to one outlet of the proportional three-way valve, and the other end of which is connected to the heat exchange component; a return water pipe, one end of which is connected to the other outlet of the proportional three-way valve, and the other end of which is connected to the outdoor unit; a control module connected to the proportional three-way valve to control the flow rate of fluid entering the water distribution pipe and the return water pipe; and a temperature sensor located between the indoor unit and the heat exchange component, the temperature sensor being signal-connected to the control module.

[0006] Furthermore, a first control valve is installed on the heat exchange pipeline. The first control valve is connected to the control module via a signal. The first control valve is located between the indoor unit and the proportional three-way valve to control the connection or disconnection between the indoor unit and the proportional three-way valve.

[0007] Furthermore, there are multiple indoor units, each connected to a heat exchange pipeline, and multiple first control valves, each corresponding to one of the multiple indoor units.

[0008] Furthermore, a second control valve for controlling fluid flow is installed on the water distribution pipeline. The second control valve is connected to the control module via a signal and is located between the heat exchange component and the proportional three-way valve.

[0009] Furthermore, the flow path structure also includes a water distributor, which is connected to a water distribution pipeline. The water distribution pipeline has multiple heat exchange branch pipes and multiple heat exchange components. The multiple heat exchange components are connected to the multiple heat exchange branch pipes in a one-to-one correspondence. Each heat exchange branch pipe is equipped with a second control valve for controlling the fluid flow rate.

[0010] Furthermore, the flow path structure also includes a water supply branch pipe, one end of which is connected to the water supply pipeline, and the other end of which is connected to the water distributor. A proportional two-way valve for controlling the flow rate of the fluid is installed on the water supply branch pipe, and the proportional two-way valve is connected to the control module signal.

[0011] Furthermore, the flow path structure also includes: a water collector connected to the return water pipeline, the water collector being equipped with multiple water collection branch pipes, the multiple water collection branch pipes being connected to multiple heat exchange components one by one; and a buffer water tank used to store fluid, the buffer water tank being connected to the return water pipeline.

[0012] Furthermore, there are multiple temperature sensors, which are arranged at intervals along the direction of the indoor unit close to the heat exchange components.

[0013] An air conditioning system includes the above-described flow path structure, wherein the indoor unit of the flow path structure is disposed at the top of the room, and the heat exchange component of the flow path structure is disposed at the bottom of the room.

[0014] A control method, applicable to the above-mentioned flow path structure, includes: setting a threshold T. 设 B, C; where B > C; if T 设 If -T2≥B, then the proportional three-way valve opens the return water pipe and closes the distribution water pipe; if C≤T 设 If -T2 < B, then the proportional three-way valve is used to connect the return water pipe and the distribution water pipe. Furthermore, the control method also includes: setting a heat exchange-side temperature sensor between the temperature sensor and the heat exchange component, and setting an indoor-side temperature sensor between the temperature sensor and the indoor unit; monitoring the detected value T1 of the heat exchange-side temperature sensor and the detected value T2 of the indoor-side temperature sensor; setting a threshold D; where C > D; if D ≤ T 设 -T2<C, control the flow rate in the return water pipe to gradually decrease; control the flow rate in the distribution water pipe to gradually increase until T1≥T2≥T3.

[0015] Beneficial effects: The flow path structure, air conditioning system and control method of the present invention optimize the water circuit of conventional water multi-split air conditioning. By adding only a few pipes and water valves to the conventional water multi-split air conditioning water circuit, the water temperature of the underfloor heating coil can be reduced, the service life of the underfloor heating coil can be extended, and the heat can be concentrated in the lower part of the room where people are active, reducing heat waste and reducing system energy consumption. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the flow path structure used in an embodiment of the present invention; Figure 2 yes Figure 1 A magnified view of part A in the middle; Figure 3 This is a schematic diagram of the temperature sensor used in an embodiment of the present invention; Figure 4 This is a flowchart of the control method used in an embodiment of the present invention.

[0017] The above figures include the following reference numerals: 1. Outdoor unit; 10. Water supply pipe; 2. Indoor unit; 20. Heat exchange pipe; 3. Proportional three-way valve; 30. Water distribution pipe; 4. Heat exchange components; 40. Return water pipe; 50. Heat exchange branch pipe; 60. Water supply branch pipe; 61. Heat exchange side temperature sensor; 62. Temperature sensor; 63. Indoor side temperature sensor; 71. First control valve; 72. Second control valve; 8. Water distributor; 81. Water collector; 82. Buffer water tank; 9. Proportional two-way valve. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0019] According to an embodiment of the present invention, a flow path structure is provided; please refer to [link / reference]. Figures 1 to 3The system includes: an outdoor unit 1 with a water supply pipe 10; an indoor unit 2 connected to the water supply pipe 10; the indoor unit 2 including a heat exchange pipe 20, so that fluid in the water supply pipe 10 passes through the indoor unit 2 and enters the heat exchange pipe 20; a proportional three-way valve 3, the inlet of which is connected to the heat exchange pipe 20; a heat exchange component 4 located below the indoor unit 2, the heat exchange component 4 being spaced apart from the indoor unit 2; and a water distribution pipe 30, one end of which is connected to one outlet of the proportional three-way valve 3. The other end of the water distribution pipe 30 is connected to the heat exchange component 4; the return water pipe 40 has one end connected to the other outlet of the proportional three-way valve 3, and the other end connected to the outdoor unit 1; the control module is connected to the proportional three-way valve 3 to control the flow rate of the fluid entering the water distribution pipe 30 and the return water pipe 40; the temperature sensor 62 is located between the indoor unit 2 and the heat exchange component 4, and the temperature sensor 62 is connected to the control module for signal connection.

[0020] With the above configuration, a temperature sensor 62 is installed between the indoor unit 2 and the heat exchange component 4. The temperature sensor 62 is used to detect temperature information and transmit it to the control module. A proportional three-way valve 3 is installed on the pipeline connecting the indoor unit 2 and the heat exchange component 4. The control module is signal-connected to the proportional three-way valve 3. The control module controls the flow rate of the water distribution pipeline 30 and the return pipeline 40 connected to the proportional three-way valve 3 based on the temperature information detected by the temperature sensor 62. This regulates the flow rate of the fluid entering the heat exchange component 4 from the indoor unit 2, thereby improving the heating efficiency of the heat exchange component 4 under different temperature conditions. It also allows the high-temperature fluid to circulate between the indoor unit 2 and the heat exchange component 4, avoiding the problem that, under normal conditions, when the indoor unit 2 and the heat exchange component 4 are heating simultaneously, the heat exchange is mainly carried out by the indoor unit 2 through convection, causing the heat to concentrate at the top of the room and not directly act on the human body, thus wasting energy. This solves the technical problem of low heating efficiency in air conditioning systems in related technologies.

[0021] In the flow path structure of this embodiment, see Figure 1A first control valve 71 is installed on the heat exchange pipeline 20. The first control valve 71 is connected to the control module via a signal. The first control valve 71 is located between the indoor unit 2 and the proportional three-way valve 3 to control the connection or disconnection between the indoor unit 2 and the proportional three-way valve 3. Thus, when the control module controls the first control valve 71 to close, the fluid in the indoor unit 2 no longer flows into the heat exchange pipeline 20. Since the pipes inside the indoor unit 2 are already filled with fluid, the fluid can no longer enter the indoor unit 2 from the water supply pipeline 10 when the first control valve 71 is closed. Therefore, while controlling the connection or disconnection between the indoor unit 2 and the proportional three-way valve 3, the first control valve 71 can also control the water flow rate entering the indoor unit, thereby adjusting the heat exchange efficiency of the indoor unit 2 by controlling the opening and closing of the first control valve 71.

[0022] In the flow path structure of this embodiment, see Figure 1 There are multiple indoor units 2, each connected to a heat exchange pipe 20. There are also multiple first control valves 71, each corresponding to one of the multiple indoor units 2. This allows one or more first control valves 71 to be selectively opened based on the indoor ambient temperature, enabling heat exchange through the corresponding indoor unit 2 and allowing the indoor units 2 to adapt more flexibly to changes in the indoor environment.

[0023] In the flow path structure of this embodiment, see Figure 1 A second control valve 72 for controlling fluid flow is installed on the water distribution pipe 30. The second control valve 72 is connected to the control module via a signal and is located between the heat exchange component 4 and the proportional three-way valve 3. Thus, the control module controls the opening and closing of the second control valve 72 based on the detection data from the temperature sensor 62, thereby controlling the flow of high-temperature fluid between the indoor unit 2 and the heat exchange component 4. When the temperature sensor 62 detects that the indoor temperature is too low, the control module opens the second control valve 72, allowing the high-temperature fluid to enter the heat exchange component 4, improving heat exchange efficiency.

[0024] In the flow path structure of this embodiment, see Figure 1 The flow path structure also includes a water distributor 8, which is connected to a water distribution pipe 30. The water distribution pipe 30 has multiple heat exchange branch pipes 50 and multiple heat exchange components 4, which are connected one-to-one with the multiple heat exchange branch pipes 50. Each heat exchange branch pipe 50 is equipped with a second control valve 72 for controlling the fluid flow rate. In this way, the high-temperature fluid enters the water distribution pipe 30 through the proportional three-way valve 3, flows through the water distribution pipe 30 and then enters the water distributor 8. The water distributor 8 distributes the high-temperature fluid inside it. Specifically, the control module controls the opening and closing of multiple second control valves 72. When a certain second control valve 72 is opened, high-temperature fluid flows into the corresponding heat exchange component 4, and the heat exchange component 4 performs heat exchange.

[0025] In the flow path structure of this embodiment, see Figure 1 The flow path structure also includes a water supply branch pipe 60. One end of the water supply branch pipe 60 is connected to the water supply pipe 10, and the other end is connected to the water distributor 8. A proportional two-way valve 9 for controlling the flow rate of the fluid is installed on the water supply branch pipe 60, and the proportional two-way valve 9 is connected to the control module via a signal connection. Thus, when the high-temperature fluid in the indoor unit 2 is insufficient to support the heat exchange component 4 for heat exchange, the control module controls the proportional two-way valve 9 on the water supply branch pipe 60 to open, and the high-temperature fluid enters the water distributor 8 from the outdoor unit 1 through the water supply pipe 10 and the water supply branch pipe 60, ensuring that there is enough high-temperature fluid available for distribution in the water distributor 8, thereby ensuring the heat exchange efficiency of the heat exchange component 4.

[0026] In the flow path structure of this embodiment, see Figure 1 The flow path structure also includes: a water collector 81, connected to the return water pipe 40, with multiple water collection branch pipes 70 on the water collector 81, each of which is connected to a corresponding heat exchange component 4; and a buffer water tank 82, used to store fluid, which is connected to the return water pipe 40. Thus, when the high-temperature fluid exchanges heat through the heat exchange component 4, it flows through the water collection branch pipes 70 to the water collector 81. The fluid in the water collector 81 flows through the buffer water tank 82, and after being buffered by the buffer water tank 82, it returns to the outdoor unit 1 through the return water pipe 40.

[0027] In the flow path structure of this embodiment, see Figure 3 Multiple temperature sensors 62 are arranged at intervals along the direction of the indoor unit 2 towards the heat exchange component 4. This addresses the issue of uneven indoor temperature in large spaces. By placing multiple temperature sensors 62 at various locations within the space, each sensor controls multiple indoor units 2 and multiple heat exchange components 4. When a temperature sensor 62 detects that the temperature at a certain location needs adjustment, the control module controls the corresponding indoor unit 2 and heat exchange component 4 to simultaneously exchange heat, improving the comfort of people moving around indoors.

[0028] This embodiment provides an air conditioning system including the aforementioned flow path structure. The indoor unit 2 of the flow path structure is located at the top of the room, and the heat exchange component 4 of the flow path structure is located at the bottom of the room. In this way, under the 3D three-dimensional heating mode of the indoor unit 2 and the heat exchange component 4, heat can be controlled within the lower and middle parts of the room where people are active, reducing heat accumulation at the top of the room. This improves human comfort, reduces system energy consumption, lowers the water temperature of the underfloor heating coils, and extends the service life of the underfloor heating coils.

[0029] This embodiment provides a control method applicable to the above-described flow path structure. The control method includes: setting a threshold T.设 B, C; where B > C; if T 设 If -T2≥B, then the proportional three-way valve 3 opens the return water pipe 40 and closes the distribution water pipe 30; if C≤T 设 -T2<B, then the proportional three-way valve 3 controls the return water pipe 40 and the distribution water pipe 30; In the control method of this embodiment, see Figure 4 The control method further includes: setting a heat exchange side temperature sensor 61 between the temperature sensor 62 and the heat exchange component 4, and setting an indoor side temperature sensor 63 between the temperature sensor 62 and the indoor unit 2; monitoring the detection value T1 of the heat exchange side temperature sensor 61 and the detection value T3 of the indoor side temperature sensor 63; setting a threshold D; where C > D; if D ≤ T 设 -T2<C, control the flow rate in the return water pipe 40 to gradually decrease; control the flow rate in the distribution water pipe 30 to gradually increase until T1≥T2≥T3.

[0030] Specifically, an indoor-side temperature sensor 63 is installed at the return air vent of indoor unit 2, a temperature sensor 62 is installed at the indoor unit's wired controller, and a heat exchange-side temperature sensor 61 is installed 0.2m above the ground. These sensors are used to detect the ambient temperature at various heights within the room. The indoor unit's wired controller is typically located 1.5m above the ground. The ambient temperature detected at these three different heights is recorded as T1, T2, and T3, respectively.

[0031] When the air conditioning system is in heating mode, indoor unit 2 and heat exchange component 4 operate simultaneously, and the set temperature T is calculated. 设 The difference between T2 and T2.

[0032] Example 1: If T 设 -T2≥5℃, indoor unit 2 operates at the highest fan speed, proportional three-way valve 3 controls the connection between heat exchange pipe 20 and return water pipe 40, water distribution pipe 30 is closed, proportional two-way valve 3 is opened to the maximum flow, 71 is in the fully open state, 72 is in the open state, and conventional rapid heating is carried out; at this time, the water temperature in heat exchange component 4 is high and the flow rate is large, which belongs to the conventional 3D heating scheme that can quickly heat up.

[0033] Example 2: If 4℃≤T 设≤5℃, indoor unit 2 operates at the highest fan speed. The proportional three-way valve 3 connects heat exchange pipe 20 to distribution pipe 30 and return pipe 40, distributing water entering from heat exchange pipe 20 to distribution pipe 30 and return pipe 40. The flow rate in distribution pipe 30 gradually increases as the difference between Tset and T2 decreases, conforming to the formula: flow rate = [1 - (Tset) / T2]. 设 -T2-4)] The 100% change pattern is as follows: the flow rate in the distribution pipe 30 gradually increases until it is fully open, while the flow rate in the return pipe 40 gradually decreases until it is closed. The opening degree of the proportional two-way valve 9 varies with flow rate = (T) 设 -T2-4) The change pattern continues in a 100% manner until the proportional two-way valve 9 closes. The first control valve 71 is fully open, and the second control valve 72 is open. At this time, the water temperature in the heat exchange component 4 is low, and the water flow rate is high.

[0034] Example 3: If 2℃≤T 设 -T2 < 4℃, indoor unit 2 operates at medium fan speed, and ambient temperatures T1, T2, and T3 are monitored respectively. A proportional three-way valve 3 connects heat exchange pipe 20 to return water pipe 40 and distribution water pipe 30, distributing water from heat exchange pipe 20 to return water pipe 40 and distribution water pipe 30. The opening of distribution water pipe 30 decreases from 100% and fluctuates between 100% and 50%, while the opening of return water pipe 40 increases from 0% and fluctuates between 0% and 50%. The opening of proportional two-way valve 9 increases from 0% and fluctuates between 0% and 50%. The opening of the first control valve 71 is adjusted according to the changes in the three ambient temperatures, decreasing from 100% and fluctuating between 100% and 50%, while the second control valve 72 remains open. Based on the ambient temperatures T1, T2, and T3, adjust the openings of the return water pipe 40, the distribution water pipe 30, the proportional two-way valve 9, and the first control valve 71 according to the table below. When T1≥T2≥T3, the return water pipe 40, the distribution water pipe 30, the proportional two-way valve 9, and the first control valve 71 maintain their current openings. At this time, the water temperature of the heat exchange component 4 is low, the water flow rate is moderate, and the heating flow of the heat exchange component 4 is supplemented.

[0035] Example 4: If T 设-T2 < 2℃, the indoor unit operates at low fan speed, and the ambient temperatures T1, T2, and T3 are monitored respectively. A proportional three-way valve connects heat exchange pipe 20 to return water pipe 40 and distribution water pipe 30. Water entering from heat exchange pipe 20 is distributed to return water pipe 40 and distribution water pipe 30. The opening of distribution water pipe 30 increases from 50% and fluctuates between 50% and 100%, while the opening of pipe 2 decreases from 50% and fluctuates between 50% and 0%. A proportional two-way valve 9 adjusts the water valve opening according to the ambient temperature difference, fluctuating between 50% and 100%. The opening of the first control valve 71 is adjusted according to the changes in the three ambient temperature values, decreasing from 100% and fluctuating between 100% and 0%. The second control valve 72 is in the open state. The first control valve 71 adjusts the opening of the return water pipe 40, the distribution water pipe 30, the proportional two-way valve 9, and the first control valve 71 according to the ambient temperature values ​​T1, T2, and T3, as shown in the table below. When the adjustment reaches T1≥T2>T3, the return water pipe 40, the distribution water pipe 30, the proportional two-way valve 9, and the first control valve 71 maintain their current opening. At this time, the water temperature and flow rate in the heat exchange component 4 are low, requiring additional heating flow to be supplied to the heat exchange component 4.

[0036] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application 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 so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0037] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments, and will not be repeated here.

[0038] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0039] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0040] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A flow path structure, characterized in that, include: The outdoor unit (1) has a water supply pipe (10); Indoor unit (2) is connected to the water supply pipe (10); the indoor unit (2) includes a heat exchange pipe (20) so that the fluid in the water supply pipe (10) enters the heat exchange pipe (20) after passing through the indoor unit (2). A proportional three-way valve (3) is provided, the inlet of which is connected to the heat exchange pipeline (20); A heat exchange component (4) is located below the indoor unit (2), and the heat exchange component (4) is arranged at a distance from the indoor unit (2); Water distribution pipeline (30), one end of which is connected to one outlet of the proportional three-way valve (3); The return water pipe (40) is connected at one end to the other outlet of the proportional three-way valve (3) and at the other end to the outdoor unit (1). Water distributor (8) is connected to the other end of water distribution pipe (30), and the water distributor is also connected to heat exchange component (4); Water supply branch pipe (60), one end of which is connected to the water supply pipeline (10) and the other end is connected to the water distributor (8); Water collector (81), one end of which is connected to the return water pipe (40), and the other end is connected to the heat exchange component (4); A control module is connected to the proportional three-way valve (3) to control the flow rate of fluid entering the water distribution pipeline (30) and the return water pipeline (40) through the proportional three-way valve (3); Temperature sensor (62) is located between the indoor unit (2) and the heat exchange component (4), and the temperature sensor (62) is signal-connected to the control module.

2. The flow path structure according to claim 1, characterized in that, A first control valve (71) is provided on the heat exchange pipeline (20). The first control valve (71) is connected to the control module. The first control valve (71) is located between the indoor unit (2) and the proportional three-way valve (3) to control the connection or disconnection between the indoor unit (2) and the proportional three-way valve (3).

3. The flow path structure according to claim 2, characterized in that, There are multiple indoor units (2), and each of the multiple indoor units (2) is connected to the heat exchange pipeline (20). There are multiple first control valves (71), and each of the multiple first control valves (71) is set in a one-to-one correspondence with the multiple indoor units (2).

4. The flow path structure according to claim 1, characterized in that, The water distribution pipeline (30) is equipped with a second control valve (72) for controlling the fluid flow rate. The second control valve (72) is connected to the control module via a signal and is located between the heat exchange component (4) and the proportional three-way valve (3).

5. The flow path structure according to claim 4, characterized in that, The flow path structure also includes the water distributor (8) having multiple heat exchange branch pipes (50), and multiple heat exchange components (4), with each of the multiple heat exchange components (4) being connected to the multiple heat exchange branch pipes (50) in a one-to-one correspondence; each of the heat exchange branch pipes (50) is provided with a second control valve (72) for controlling the fluid flow rate.

6. The flow path structure according to claim 5, characterized in that, The water supply branch pipe (60) is equipped with a proportional two-way valve (9) for controlling the flow rate of the fluid, and the proportional two-way valve (9) is connected to the control module via signal.

7. The flow path structure according to claim 5, characterized in that, The flow path structure also includes: The water collector (81) is provided with multiple water collection branch pipes (70), and the multiple water collection branch pipes (70) are connected to the multiple heat exchange components (4) one by one. A buffer tank (82) is used to store fluid and is connected to the return water pipe (40).

8. The flow path structure according to claim 1, characterized in that, There are multiple temperature sensors (62), and the multiple temperature sensors (62) are arranged at intervals along the direction of the indoor unit (2) near the heat exchange component (4).

9. An air conditioning system comprising the flow path structure as described in any one of claims 1 to 8, characterized in that, The indoor unit (2) of the flow path structure is located at the top of the room, and the heat exchange component (4) of the flow path structure is located at the bottom of the room.

10. A control method applicable to the flow path structure as described in any one of claims 1 to 8, characterized in that, The control method includes: Set threshold T 设 B, C; where B > C; If T 设 If -T2≥B, then control the proportional three-way valve (3) to open the return water pipeline (40) and close the water distribution pipeline (30). If C≤T 设 If -T2 < B, then control the proportional three-way valve (3) to connect the return water pipeline (40) and the distribution water pipeline (30).

11. The control method according to claim 10, characterized in that, The control method further includes: A heat exchange side temperature sensor (61) is provided between the temperature sensor (62) and the heat exchange component (4), and an indoor side temperature sensor (63) is provided between the temperature sensor (62) and the indoor unit (2); the detection value T1 of the heat exchange side temperature sensor (61) and the detection value T2 of the indoor side temperature sensor (63) are monitored; Set a threshold D; where C > D; If D≤T 设 -T2<C, control the flow rate in the return water pipe (40) to gradually decrease; control the flow rate in the distribution water pipe (30) to gradually increase until T1≥T2≥T3.

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