Air conditioner indoor unit, air conditioner system and control method of air conditioner indoor unit

Abstract

The invention relates to the technical field of air conditioners, in particular to an air conditioner indoor unit, an air conditioner system and a control method thereof, and aims to solve the problems that when an existing air conditioner indoor unit is used in an anti-explosion place, anti-explosion design needs to be conducted on electrical parts, so that cost is increased, and potential safety hazards still exist. In order to achieve the purpose, the air conditioner indoor unit comprises an indoor heat exchanger and an indoor hydraulic fan used for dissipating heat of the indoor heat exchanger. The indoor heat exchanger and the indoor hydraulic fan are arranged on the circulating water pipe, and water in the circulating water pipe exchanges heat with indoor air through the indoor heat exchanger and further provides operation power for the indoor hydraulic fan. Water circularly flowing in the circulating water pipe serves as a heat exchange medium to conduct heat exchange between the indoor heat exchanger and indoor air, and therefore the indoor temperature can be adjusted. Meanwhile, the circulating water further provides power for the indoor hydraulic fan, the potential safety hazard of explosion caused by electric sparks generated by electrical parts is completely eliminated, and a reliable temperature adjusting solution is provided for anti-explosion places.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and specifically provides an indoor unit of an air conditioner, an air conditioning system and a control method thereof. Background Art

[0002] Currently, the heat exchangers of the indoor units of heat pump air conditioners and the products of indoor unit air handling units both rely on electrification control. In this control system, the heat exchanger of the indoor unit of the air conditioner cooperates with an electronic expansion valve to adjust the heat exchange capacity of the heat exchanger. Electricity, as the power source of the indoor fan, undertakes the important task of driving air flow, thereby realizing efficient heat exchange on the surface of the heat exchanger.

[0003] However, since electrification control inevitably involves high voltage. During the operation of high voltage, the current and voltage are relatively high. Once an electrical fault occurs, such as a short circuit or poor contact in the circuit, it is extremely easy to generate electric sparks. Because there are usually flammable and explosive gases, dust and other substances in explosion-proof places, even extremely tiny electric sparks may trigger serious explosion accidents. Therefore, the existence of high voltage greatly restricts the use of the indoor unit of the heat pump air conditioner in explosion-proof places.

[0004] In order to meet the strict requirements of explosion-proof places for equipment safety, according to the existing technical means, it is necessary to carry out explosion-proof design on the electrical components of the indoor unit of the air conditioner. However, this explosion-proof design has many drawbacks. On the one hand, from the perspective of cost, explosion-proof design requires the selection of special explosion-proof materials and the adoption of complex processes, which will lead to a significant increase in product cost. This not only increases the production cost of equipment manufacturers, but also makes end-users face higher economic burdens during procurement and use. On the other hand, from the perspective of safety, even if explosion-proof design is carried out, as long as the equipment is in the powered-on state, the possibility of sparking cannot be fundamentally eliminated. Because during the long-term operation of electrical equipment, it will be affected by various factors, such as equipment aging, environmental temperature changes, mechanical vibrations, etc. These factors may lead to a decline in explosion-proof performance, and then trigger sparking phenomena, which undoubtedly casts a shadow of safety hazards over explosion-proof places all the time. In addition, the complex explosion-proof design will also increase the volume and weight of the equipment, making the installation and maintenance of the equipment more difficult, and further reducing the convenience and reliability of the equipment in actual use.

[0005] Correspondingly, there is a need in the art for a new indoor unit of an air conditioner to solve the problems that the explosion-proof design of electrical components is required for the existing indoor unit of an air conditioner when used in explosion-proof places, resulting in increased costs and still existing safety hazards. Summary of the Invention

[0006] The present invention aims to solve the above technical problems, that is, to solve the problems that the explosion-proof design of electrical components is required for the existing indoor unit of an air conditioner when used in explosion-proof places, resulting in increased costs and still existing safety hazards.

[0007] In a first aspect, the present invention provides an indoor air conditioner unit. The air conditioning system includes a circulating water pipe, and the indoor air conditioner unit includes an indoor heat exchanger and an indoor hydraulic fan for dissipating heat from the indoor heat exchanger.

[0008] The indoor heat exchanger and the indoor hydraulic fan are respectively arranged on the circulating water pipe. The water in the circulating water pipe exchanges heat with indoor air through the indoor heat exchanger, and also provides power for the indoor hydraulic fan.

[0009] In the case of adopting the above technical solution, the water circulating in the circulating water pipe serves as a heat exchange medium to exchange heat with indoor air at the indoor heat exchanger, thereby being able to adjust the indoor temperature. At the same time, the circulating water also provides power for the indoor hydraulic fan, realizing the physical drive of the fan to rotate by water power. This driving method is not only energy-efficient, but also reduces the maintenance cost of the equipment. For indoor environments with explosion-proof requirements, the advantages of the indoor air conditioner unit of the present invention are particularly obvious. Since neither the indoor heat exchanger nor the indoor hydraulic fan needs to be equipped with electrical components, the potential safety hazard of explosion caused by electric sparks generated by electrical components is completely eliminated, providing a reliable temperature regulation solution for explosion-proof places. In addition, the indoor air conditioner unit of the present invention also does not need to be equipped with a complex control circuit and sensors, so the cost of the indoor unit is greatly reduced.

[0010] In a second aspect, the present invention further provides an air conditioning system, which includes a circulating water pipe, an outdoor air conditioner unit, and an indoor air conditioner unit; the outdoor air conditioner unit includes a first outdoor heat exchanger.

[0011] The indoor air conditioner unit includes an indoor heat exchanger and an indoor hydraulic fan for dissipating heat from the indoor heat exchanger.

[0012] The indoor heat exchanger and the indoor hydraulic fan are respectively arranged on the circulating water pipe. The water in the circulating water pipe flows between the indoor heat exchanger and the first outdoor heat exchanger for heat exchange, and also provides power for the indoor hydraulic fan.

[0013] In the case of adopting the above technical solution, the first outdoor heat exchanger cools or heats the water in the water pipe to cool or heat the room.

[0014] In an optional technical solution of the above air conditioning system, a water pump is arranged on the circulating water pipe, and the water pump is located outdoors.

[0015] In the case of adopting the above technical solution, the water pump provides pressure for the water to circulate.

[0016] In the alternative technical solution of the above air-conditioning system, the outdoor unit of the air conditioner includes a compressor and a second outdoor heat exchanger. The compressor, the first outdoor heat exchanger, and the second outdoor heat exchanger are all arranged on the refrigerant circulation pipeline. The water in the circulating water pipe exchanges heat with the refrigerant through the first outdoor heat exchanger;

[0017] Alternatively, the first outdoor heat exchanger is arranged on the circulating water pipe, and the water in the circulating water pipe exchanges heat with the outdoor air through the first outdoor heat exchanger.

[0018] In the case of adopting the above technical solution, the first outdoor heat exchanger cools or heats the water in the water pipe through two schemes. One is to exchange heat between the compressor refrigerant and the water, and the other is that the outdoor air exchanges heat with the water through the first outdoor heat exchanger.

[0019] In a third aspect, the present invention also provides a control method for an air-conditioning system. The air-conditioning system includes a circulating water pipe, an outdoor unit of the air conditioner, and an indoor unit of the air conditioner. The outdoor unit of the air conditioner includes a first outdoor heat exchanger;

[0020] The indoor unit of the air conditioner includes an indoor heat exchanger and an indoor hydraulic fan for dissipating heat from the indoor heat exchanger;

[0021] The indoor heat exchanger and the indoor hydraulic fan are respectively arranged on the circulating water pipe. The water in the circulating water pipe flows between the indoor heat exchanger and the first outdoor heat exchanger for heat exchange, and also provides power for the indoor hydraulic fan. A water pump is arranged on the circulating water pipe, and the water pump is located outdoors;

[0022] The control method includes:

[0023] Obtain the inlet water temperature value and the outlet water temperature value of the circulating water pipe;

[0024] Calculate the difference △T1 between the inlet water temperature value and the outlet water temperature value;

[0025] Adjust the water pump speed according to △T1.

[0026] In the case of adopting the above technical solution, when △T1 exceeds the preset temperature range, it is necessary to adjust the heat exchange capacity of the system by adjusting the water pump speed.

[0027] In the alternative technical solution of the control method of the above air-conditioning system, the control method further includes:

[0028] Obtain the inlet water pressure value and the outlet water pressure value of the circulating water pipe;

[0029] Calculate the difference △P1 between the inlet water pressure value and the outlet water pressure value;

[0030] Judge whether the water system is faulty according to △P1;

[0031] When the water system fails, control the air conditioning system to shut down.

[0032] In the case of adopting the above technical solution, by monitoring the pressure difference to judge whether the water system is operating normally, the fault determination can be carried out efficiently and accurately. Once a fault is detected, the air conditioning system is controlled to shut down in time, providing a strong guarantee for the safe and stable operation of the equipment.

[0033] In an alternative technical solution of the above control method of the air conditioning system, the step of "adjusting the water pump speed according to △T1" further includes:

[0034] During air conditioning refrigeration, when △T1 < the first preset temperature value, increase the water pump speed; when △T1 > the second preset temperature value, decrease the water pump speed; and / or,

[0035] During air conditioning heating, when △T1 < the first preset temperature value, decrease the water pump speed; when △T1 > the second preset value, increase the water pump speed.

[0036] In the case of adopting the above technical solution, during refrigeration, △T1 < the first preset temperature value indicates that the heat exchange capacity of the circulating water is insufficient. At this time, the water pump speed should be increased to accelerate the water flow rate, thereby correspondingly enhancing the heat exchange capacity. △T1 > the second preset temperature value means that the heat exchange capacity of the circulating water is too strong. To avoid unnecessary energy consumption, the water pump speed should be decreased to slow down the water flow rate and reduce the heat exchange capacity. During heating, △T1 < the first preset temperature value means that the heat exchange capacity of the circulating water is too strong. To avoid unnecessary energy consumption, the water pump speed should be decreased to slow down the water flow rate and reduce the heat exchange capacity. △T1 > the second preset temperature value indicates that the heat exchange capacity of the circulating water is insufficient. At this time, the water pump speed should be increased to accelerate the water flow rate, thereby correspondingly enhancing the heat exchange capacity.

[0037] In an alternative technical solution of the above control method of the air conditioning system, the step of "adjusting the water pump speed according to △T1" further includes:

[0038] When the second preset temperature value ≥ △T1 ≥ the first preset temperature value, keep the current water pump speed.

[0039] In the case of adopting the above technical solution, when △T1 is between the first preset temperature value and the second preset temperature value, it means that the heat exchange capacity of the current air conditioning system is in a moderate state, and there is no need to adjust the water pump speed.

[0040] In an alternative technical solution of the above control method of the air conditioning system, the step of "judging whether the water system fails according to △P1" further includes:

[0041] When △P1 < the first preset pressure value, it indicates that the water system fails;

[0042] When △P1 > the second preset pressure value, it indicates a water system failure; where the first preset pressure value > the second preset pressure value.

[0043] In the case of adopting the above technical solution, when △P1 < the first preset pressure value, it means that there is a water leakage failure in the water system. When △P1 > the second preset pressure value, it indicates that there is most likely a blockage failure in the water system.

[0044] In an alternative technical solution of the above control method of the air conditioning system, the step of "judging whether the water system is faulty according to △P1" further includes:

[0045] When the second preset pressure value ≥ △P1 ≥ the first preset pressure value, it indicates that the water system is operating normally.

[0046] In the case of adopting the above technical solution, when the second preset pressure value ≥ △P1 ≥ the first preset pressure value, it indicates that the water system is in a normal operating state, each component works in coordination, the water pressure difference is within a reasonable range, and the system can stably realize functions such as heat exchange.

[0047] Those skilled in the art can understand that the indoor unit of the air conditioner of the present invention includes an indoor heat exchanger and an indoor hydraulic fan for dissipating heat from the indoor heat exchanger.

[0048] The indoor heat exchanger and the indoor hydraulic fan are respectively arranged on the circulating water pipe. The water in the circulating water pipe exchanges heat between the indoor heat exchanger and the indoor air, and also provides power for the indoor hydraulic fan.

[0049] In the case of adopting the above technical solution, the water circulating in the circulating water pipe serves as a heat exchange medium to exchange heat between the indoor heat exchanger and the indoor air, thereby being able to adjust the indoor temperature. At the same time, the circulating water also provides power for the indoor hydraulic fan to realize the physical drive of the water power to rotate the fan. This driving method is not only energy-efficient but also reduces the maintenance cost of the equipment. For an indoor environment with explosion-proof requirements, the advantages of the indoor unit of the air conditioner of the present invention are particularly obvious. Since neither the indoor heat exchanger nor the indoor hydraulic fan needs to be equipped with electrical components, the potential safety hazard of explosion caused by electric sparks generated by electrical components is completely eliminated, providing a reliable temperature regulation solution for explosion-proof places. In addition, the indoor unit of the air conditioner of the present invention also does not need to be equipped with a complex control circuit and sensors, so the cost of the indoor unit is greatly reduced, and it can be used in a more severe environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The following describes the preferred embodiments of the present invention with reference to the drawings, in which:

[0051] Figure 1 is a schematic diagram of the air conditioning system of the present invention;

[0052] Figure 2 It is a schematic diagram inside the outdoor unit of the air conditioner of the present invention;

[0053] Figure 3 It is a flowchart of steps of an implementation manner of the control method of the air conditioning system of the present invention;

[0054] Figure 4 It is a flowchart of steps of another implementation manner of the control method of the air conditioning system of the present invention.

[0055] List of reference numerals:

[0056] 1. Indoor unit of air conditioner; 11. Indoor heat exchanger; 12. Indoor hydraulic fan;

[0057] 2. Circulating water pipe; 21. Water inlet pipe; 22. Water outlet pipe;

[0058] 3. Outdoor unit of air conditioner; 31. Compressor; 32. First outdoor heat exchanger; 33. Second outdoor heat exchanger; 34. Four-way valve;

[0059] 4. Water pump;

[0060] 51. Water inlet temperature sensor; 52. Water inlet pressure sensor; 53. Water outlet temperature sensor; 54. Water outlet pressure sensor. Detailed implementation manners

[0061] The preferred implementation manners of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these implementation manners are only used to explain the technical principle of the present invention and are not intended to limit the protection scope of the present invention. Those skilled in the art can make adjustments according to needs to adapt to specific application scenarios. It should be noted that in the description of the present invention, the terms indicating directions or positional relationships such as "inside", "outside", etc. are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0062] In addition, it should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0063] In order to solve the problem that the existing air conditioner indoor unit needs to be explosion-proof designed for electrical components when used in explosion-proof places, which increases costs and still has potential safety hazards, the present invention proposes an air conditioner indoor unit.

[0064] Reference Figure 1 The air conditioner indoor unit 1 of the present invention includes an indoor heat exchanger 11 and an indoor hydraulic fan 12 for dissipating heat for the indoor heat exchanger 11 .

[0065] The indoor heat exchanger 11 and the indoor hydraulic fan 12 are respectively arranged on the circulating water pipe 2 . The water in the circulating water pipe 2 exchanges heat with the indoor air through the indoor heat exchanger 11 , and also provides power for the indoor hydraulic fan 12 . Figure 1 The solid arrow in the middle indicates the flow direction of air after the indoor hydraulic fan 12 is turned on, and the single arrow indicates the flow direction of water.

[0066] The advantage of the above-mentioned arrangement is that the water circulating in the circulating water pipe 2 acts as a heat exchange medium to exchange heat with the indoor air at the indoor heat exchanger 11, thereby being able to adjust the indoor temperature. At the same time, the circulating water also provides power for the indoor hydraulic fan 12, realizing the physical drive of the fan by water power. This driving method is not only highly efficient and energy-saving, but also reduces the maintenance cost of the equipment. For indoor environments with explosion-proof requirements, the advantages of the air-conditioning indoor unit 1 of the present invention are particularly obvious. Since the indoor heat exchanger 11 and the indoor hydraulic fan 12 do not need to be equipped with electrical components, the safety hazard of explosion caused by electric sparks generated by electrical components is completely eliminated, providing a reliable temperature regulation solution for explosion-proof places. In addition, the air-conditioning indoor unit 1 of the present invention does not need to be equipped with complex control circuits and sensors, so the cost of the indoor unit is greatly reduced.

[0067] Reference Figure 1 The present invention further provides an air conditioning system, which includes an air conditioning indoor unit 1, a circulating water pipe 2 and an air conditioning outdoor unit 3.

[0068] The air conditioner indoor unit 1 includes an indoor heat exchanger 11 and an indoor hydraulic fan 12 , and the indoor heat exchanger 11 and the indoor hydraulic fan 12 are arranged on the circulating water pipe 2 .

[0069] Reference Figure 2 The air conditioner outdoor unit 3 includes a refrigerant circulation loop and a compressor 31, a four-way valve 34, a first outdoor heat exchanger 32, and a second outdoor heat exchanger 33 arranged on the refrigerant circulation loop. The refrigerant circulates between the second outdoor heat exchanger 33 and the first outdoor heat exchanger 32. The air conditioner outdoor unit 3 also includes an outdoor fan, which is used to accelerate the heat dissipation of the second outdoor heat exchanger 33.

[0070] Specifically, two heat exchange tubes are provided in the first outdoor heat exchanger 32. One of the heat exchange tubes is connected to the refrigerant circulation pipeline, and the other heat exchange tube is connected to the circulating water pipe 2, enabling the refrigerant and water to efficiently exchange heat in the first outdoor heat exchanger 32, realizing the energy transfer between two different media and providing key support for the refrigeration and heating functions of the entire air conditioning system.

[0071] In terms of heat exchange efficiency, the efficient heat exchange between the refrigerant and water in the first outdoor heat exchanger 32 greatly improves the refrigeration or heating speed of the system and can quickly meet the temperature requirements of the indoor environment.

[0072] Furthermore, the indoor hydraulic fan 12, as a key heat dissipation component of the indoor unit, mainly consists of an impeller, a rotating shaft, a guide cover, a casing, and a hydrodynamic driving device. The impeller is the core component for the hydraulic fan to achieve wind power output and can efficiently convert the kinetic energy of water into its own rotational mechanical energy under the impact of water flow.

[0073] The rotating shaft passes through the center of the impeller and is tightly connected to the impeller, responsible for transmitting the rotational power of the impeller. The rotating shaft is supported by high-precision bearings to ensure its stability and reliability during high-speed rotation, reduce friction and vibration, and lower energy consumption and noise.

[0074] The guide cover is installed in front of the impeller, and its function is to guide the water flow to impact the impeller blades at the best angle and speed. The internal shape of the guide cover is streamlined, enabling the circulating water to form a stable and orderly water flow before entering the impeller, avoiding the disorder of the water flow and energy dispersion, and further improving the energy utilization efficiency of the hydraulic fan.

[0075] The casing encapsulates components such as the impeller, the rotating shaft, and the guide cover, playing a role in protection and support.

[0076] The hydrodynamic driving device is the key part that differentiates the indoor hydraulic fan 12 from traditional electric fans. It is directly connected to the circulating water pipe 2 and uses the pressure difference generated by the flowing circulating water in the pipe as the power source. The hydrodynamic driving device usually includes a specially designed water inlet and a flow splitting structure. The water inlet can efficiently collect the energy of the circulating water and guide the water flow to the impeller blades, and the flow splitting structure ensures that the water flow acts evenly on each blade, enabling the impeller to rotate smoothly and efficiently.

[0077] Optionally, the outdoor fan is an outdoor hydraulic fan, which is installed on the circulating water pipe 2 and is also driven by water to rotate. The outdoor hydraulic fan has the same structure as the indoor hydraulic fan 12. Of course, the outdoor fan can also be an electric fan, which can be set by those skilled in the art according to actual needs and all fall within the protection scope of the present invention.

[0078] However, it should be noted that although the present invention elaborates in detail on the structure of the hydraulic fan, it is not intended to impose any restrictions on the structure of the hydraulic fan. Those skilled in the art can set the type and structure of the hydraulic fan according to actual needs. Moreover, the structures of the indoor hydraulic fan 12 and the outdoor hydraulic fan can be the same or different, and both fall within the protection scope of the present invention.

[0079] Furthermore, a pressurizing water pump 4 is provided on the circulating water pipe 2. The water pump 4 is used to drive the continuous circulation of water in the circulating water pipe 2. The water pump 4 is arranged in the outdoor area, effectively avoiding the adverse effects that the electrical components of the water pump 4 may cause to indoor safety. Especially in an indoor environment with extremely high electrical safety requirements, this setting method can reduce the risk of potential safety hazards caused by electrical failures from the source. The water pump 4 converts electrical energy into the kinetic energy of water through mechanical power, ensuring the stable flow of water in the circulating water pipe 2 along the established path.

[0080] Of course, the water pump 4 can also be cancelled according to actual needs. Instead, by using the principle of natural convection, when designing the water system, a certain height difference is formed between the indoor heat exchanger 11 and the first outdoor heat exchanger 32. The difference in density of water at different temperatures is utilized to promote the water circulation. When the water in the indoor heat exchanger 11 absorbs heat and its temperature rises, the density of the water becomes smaller, and the hot water will flow upward; while the water in the first outdoor heat exchanger 32 releases heat and its temperature drops, the density becomes larger, and the cold water will flow downward. In this way, a natural convection cycle is formed to realize the flow of water in the circulating water pipe 2. In addition, the principle of thermosiphon can also be adopted, and heating and cooling areas are set at specific parts of the circulating water pipe 2 to generate a pressure difference through local temperature changes, thereby promoting the circulating flow of water. However, compared with the drive of the water pump 4, these natural drive methods may have certain gaps in terms of circulating efficiency and stability, which need to be considered in system design and practical applications.

[0081] Furthermore, an inlet water temperature sensor 51 and an inlet water pressure sensor 52 are also provided on the circulating water pipe 2. The inlet water temperature sensor 51 and the inlet water pressure sensor 52 are arranged on the inlet water pipe 21, and the inlet water pipe 21 is the pipeline for water to enter the indoor heat exchanger 11 from the first outdoor heat exchanger 32. An outlet water temperature sensor 53 and an outlet water pressure sensor 54 are arranged on the outlet water pipe 22, and the outlet water pipe 22 is the pipeline for the indoor heat exchanger 11 to return water to the first outdoor heat exchanger 32. A controller is provided in the air conditioner outdoor unit 3. The controller is configured to be able to obtain the values detected by the sensors and be able to control the operating state of the air conditioning system. For example, the start and stop and rotation speed of the water pump 4, the start and stop and frequency of the compressor 31, and so on. During use, the user can control the operation of the air conditioning system by setting the temperature.

[0082] The working process of the air conditioning system is as follows: In the cooling mode of the air conditioning system, the water pump 4 and the compressor 31 are turned on. The compressor 31 compresses the refrigerant into a high-temperature and high-pressure gaseous refrigerant. After the refrigerant enters the second outdoor heat exchanger 33 for condensation and heat release, it enters the first outdoor heat exchanger 32 to absorb the heat of the water. After the water is cooled down, it enters the indoor heat exchanger 11 through the water pipe. At this time, the water exchanges heat with the hot air in the room, absorbs the indoor heat, so as to achieve the purpose of cooling the room. After absorbing the heat, the temperature of the water rises. These heated water returns to the first outdoor heat exchanger 32 through the water pipe for heat release, and the first outdoor heat exchanger 32 cools it down again. This cycle repeats continuously to continuously realize the indoor cooling function.

[0083] In the heating mode, the high-temperature and high-pressure refrigerant at the compressor outlet enters the first outdoor heat exchanger 32 for heat release and absorbs heat at the second outdoor heat exchanger 33. The refrigerant in the first outdoor heat exchanger 32 heats up the water in the water pipe. The heated water flows into the indoor heat exchanger 11. At the indoor heat exchanger 11, the hot water releases the heat it carries to the indoor air, raising the indoor temperature. As the heat is released, the temperature of the water gradually decreases. The cooled water returns to the first outdoor heat exchanger 32 along the water pipe again, and the first outdoor heat exchanger 32 will heat it up again. This cycle repeats continuously to continuously supply heat to the room.

[0084] Of course, those skilled in the art can also cancel the four-way valve 34 according to actual needs and achieve the switching between pipelines in other ways. The present invention does not impose any restrictions on the deformed pipelines based on this, and all fall within the protection scope of the present invention.

[0085] In another possible implementation, the outdoor unit of the air conditioner includes a first outdoor heat exchanger 32 and an outdoor hydraulic fan. The indoor heat exchanger 11, the indoor hydraulic fan 12, the first outdoor heat exchanger 32, and the outdoor hydraulic fan are all arranged on the circulating water pipe 2.

[0086] Both the indoor hydraulic fan 12 and the outdoor hydraulic fan rotate under the drive of water pressure. The indoor hydraulic fan 12 is used to dissipate heat from the indoor heat exchanger 11, and the outdoor hydraulic fan is used to dissipate heat from the first outdoor heat exchanger 32.

[0087] The indoor heat exchanger 11, the indoor hydraulic fan 12, the first outdoor heat exchanger 32, and the outdoor hydraulic fan are all connected in series on the same circulating water pipe 2, forming a complete and efficient heat exchange cycle system. Heat exchange occurs between the indoor heat exchanger 11 and the first outdoor heat exchanger 32 through the water medium in the circulating water pipe 2. The water continuously flows in this closed circulation system, taking out the indoor heat and releasing it outdoors, or introducing the outdoor heat into the indoor, so as to achieve the functions of cooling or heating.

[0088] In terms of energy utilization, both the indoor hydraulic fan 12 and the outdoor hydraulic fan are driven to rotate by water pressure without the need for additional electric drive, greatly improving the energy utilization efficiency and reducing energy consumption. Secondly, due to the reduction in the use of electrical components, not only the manufacturing cost of the equipment is reduced, but also the reliability and stability of the system are improved. In terms of maintenance, without a complex electrical system, the maintenance work is made simpler and more convenient, and the maintenance cost is significantly reduced. Moreover, for some special places with strict restrictions on the use of electrical equipment, such as explosion-proof and anti-static environments, the advantages of this air-conditioning system are particularly prominent, as it fundamentally eliminates the risk of safety accidents caused by electrical failures. At the same time, water, as a heat exchange medium, has the characteristic of a large specific heat capacity, which can make the indoor temperature change more smoothly and provide a more comfortable indoor environment for users.

[0089] The working process of the air-conditioning system is as follows: In the cooling mode of the air-conditioning system, the water pump 4 is turned on, and the water in the first outdoor heat exchanger 32 exchanges heat with the outdoor air for cooling. The cooled water enters the indoor heat exchanger 11 to absorb the indoor heat, thereby achieving the purpose of cooling the indoor. After absorbing the heat, the temperature of the water rises, and this heated water returns to the first outdoor heat exchanger 32 through the water pipe for cooling, and so on, continuously realizing the indoor cooling function.

[0090] In the heating mode, the water in the first outdoor heat exchanger 32 exchanges heat with the outdoor air for heating and temperature rise, and the heated water flows into the indoor heat exchanger 11. At the indoor heat exchanger 11, the hot water releases the heat it carries into the indoor air, raising the indoor temperature. As the heat is released, the temperature of the water gradually decreases, and the cooled water returns to the first outdoor heat exchanger 32 along the circulation water path. The first outdoor heat exchanger 32 will heat it up again, and so on, continuously heating the indoor.

[0091] As Figure 3 shown, the present invention also proposes a control method for an air-conditioning system, and the control method includes the following steps:

[0092] Step S10: Obtain the inlet water temperature value and the outlet water temperature value of the circulating water pipe;

[0093] Step S11: Calculate the difference △T1 between the inlet water temperature value and the outlet water temperature value;

[0094] Step S12: Adjust the rotation speed of the water pump 4 according to △T1.

[0095] The inlet water temperature value is the water temperature value in the inlet pipe 21, measured by the inlet water temperature sensor 51, and the outlet water temperature is the water temperature value in the outlet pipe 22, measured by the outlet water temperature sensor 53.

[0096] Step S11 further includes:

[0097] Step: When the air conditioner is cooling and the second preset temperature value ≥ △T1 ≥ the first preset temperature value, maintain the current speed of the water pump;

[0098] Step: When △T1 < the first preset temperature value, increase the speed of the water pump;

[0099] Step: When △T1 > the second preset temperature value, decrease the speed of the water pump;

[0100] Step: When the air conditioner is heating and the second preset temperature value ≥ △T1 ≥ the first preset temperature value, maintain the current speed of the water pump;

[0101] Step: When △T1 < the first preset temperature value, decrease the speed of the water pump;

[0102] Step: When △T1 > the second preset temperature value, increase the speed of the water pump.

[0103] When the difference in inlet and outlet water temperature △T1 is the inlet water temperature value - the outlet water temperature value, when △T1 is between the first preset temperature value and the second preset temperature value, it means that the heat exchange capacity of the current air-conditioning system is in a moderate state and there is no need to adjust the speed of the water pump.

[0104] However, when △T1 exceeds the preset temperature range, it is necessary to adjust the heat exchange capacity of the system by adjusting the speed of the water pump. During cooling, when △T1 < the first preset temperature value, it indicates that the heat exchange capacity of the circulating water is insufficient. At this time, the speed of the water pump should be increased to accelerate the water flow rate, thereby correspondingly enhancing the heat exchange capacity. When △T1 > the second preset temperature value, it means that the heat exchange capacity of the circulating water is too strong. To avoid unnecessary energy consumption, the speed of the water pump should be decreased to slow down the water flow rate and reduce the heat exchange capacity. During heating, when △T1 < the first preset temperature value, it means that the heat exchange capacity of the circulating water is too strong. To avoid unnecessary energy consumption, the speed of the water pump should be decreased to slow down the water flow rate and reduce the heat exchange capacity. When △T1 > the second preset temperature value, it indicates that the heat exchange capacity of the circulating water is insufficient. At this time, the speed of the water pump should be increased to accelerate the water flow rate, thereby correspondingly enhancing the heat exchange capacity.

[0105] Taking a specific numerical range as an example, if the difference in inlet and outlet water temperature △T1 can be maintained within the range of [-2°C, 2°C], it can not only ensure the stability of the indoor temperature but also reduce energy consumption.

[0106] During cooling, if △T1 is less than -2°C, it means that the ability of the circulating water to carry away heat is insufficient. At this time, increasing the speed of water pump 4 to make the water flow faster can allow more heat to be carried away by the circulating water and improve the heat exchange effect. If △T1 is greater than 2°C, it indicates that too much heat is carried away by the circulating water, resulting in energy waste. Decreasing the speed of the water pump can reduce unnecessary energy consumption.

[0107] During heating, if △T1 is less than -2°C, it indicates that the heat released by the circulating water is excessive, and reducing the pump speed can reduce the excessive heat release. If △T1 is greater than 2°C, it means that the heat released by the circulating water is insufficient, and increasing the pump speed can allow more heat to be dissipated into the room.

[0108] Of course, the first preset temperature value and the second preset temperature value can be set according to experimental data or based on experience. Those skilled in the art can set them according to actual needs. The present invention does not impose any limitations on the specific values of the first preset temperature value and the second preset temperature value, and they all fall within the protection scope of the present invention.

[0109] Furthermore, when the water system operates abnormally, it will affect the heat exchange capacity of the system. Therefore, to ensure the reliable operation of the air conditioning system, as Figure 4 shown, the control method further includes:

[0110] Step S20: Obtain the inlet pressure value and the outlet pressure value of the circulating water pipe;

[0111] Step S21: Calculate the difference △P1 between the inlet pressure value and the outlet pressure value;

[0112] Step S22: Determine whether the water system is operating normally according to △P1;

[0113] Step S23: When the water system is not operating normally, control the air conditioning system to shut down.

[0114] The inlet pressure value is the water pressure in the inlet pipe 21, which is measured by the inlet pressure sensor 52. The outlet pressure value is the water pressure in the outlet pipe 22, which is measured by the outlet pressure sensor 54.

[0115] The reasons for the abnormal operation of the water system are diverse, mainly including water leakage in the water system, fouling and blockage of the heat exchanger, and malfunction of the water pump 4, etc. The occurrence of these faults will cause abnormal changes in the difference between the inlet pressure and the outlet pressure, either too large or too small. Based on this, by monitoring the pressure difference to determine whether the water system is operating normally, it is possible to efficiently and accurately perform fault determination. Once a fault is detected, the air conditioning system is promptly controlled to shut down, which provides a strong guarantee for the safe and stable operation of the equipment, reduces the maintenance cost and the inconvenience in use caused by the fault. And it can also avoid more serious equipment damage caused by water system faults, or affect the comfort and safety of the indoor environment.

[0116] Specifically, step S22 further includes:

[0117] Step: When the second preset pressure value ≥ △P1 ≥ the first preset pressure value, it indicates that the water system is operating normally;

[0118] Step: When △P1 < the first preset pressure value, it indicates that there is a water leakage fault in the water system;

[0119] Step: When △P1 > the second preset pressure value, it indicates that there is a blockage fault in the water system.

[0120] When the second preset pressure value ≥ △P1 ≥ the first preset pressure value, it indicates that the water system is in a normal operating state, each component works in coordination, the water pressure difference is within a reasonable range, and the system can stably achieve functions such as heat exchange.

[0121] When △P1 < the first preset pressure value, it means that there is a water leakage fault in the water system. Because under normal circumstances, the water pressure in the water system is maintained within a certain range. Once there is a water leakage, the water flow in the pipe decreases, which will cause the difference between the inlet pressure and the outlet pressure to be lower than the normal range.

[0122] When △P1 > the second preset pressure value, it indicates that there is very likely a blockage fault in the water system. For example, the heat exchanger is dirty blocked or there is foreign matter blocking inside the pipeline. These situations will hinder the normal flow of water, increase the inlet pressure, and relatively reduce the outlet pressure, ultimately resulting in the pressure difference exceeding the normal upper limit.

[0123] As described in the first paragraph of this section, the above embodiments are only used to illustrate the principle of the present invention and are not intended to limit the protection scope of the present invention. Without departing from the principle of the present invention, those skilled in the art can adjust the above structure so that the present invention can be applied to more specific application scenarios.

[0124] So far, the technical solution of the present invention has been described in combination with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. An indoor unit of an air conditioner, characterized in that, The indoor air conditioner (1) includes an indoor heat exchanger (11) and an indoor hydraulic fan (12) for dissipating heat from the indoor heat exchanger (11); the air conditioning system includes a circulating water pipe (2); The indoor heat exchanger (11) and the indoor hydraulic fan (12) are respectively arranged on the circulating water pipe (2). The water in the circulating water pipe (2) exchanges heat with indoor air through the indoor heat exchanger (11) and also provides power for the indoor hydraulic fan (12).

2. An air conditioning system, characterized in that, The air conditioning system includes an indoor air conditioner (1), a circulating water pipe (2), and an outdoor air conditioner (3); The indoor air conditioner (1) includes an indoor heat exchanger (11) and an indoor hydraulic fan (12) for dissipating heat from the indoor heat exchanger (11); The outdoor air conditioner (3) includes a first outdoor heat exchanger (32); The indoor heat exchanger (11) and the indoor hydraulic fan (12) are respectively arranged on the circulating water pipe (2). The water in the circulating water pipe (2) flows between the indoor heat exchanger (11) and the first outdoor heat exchanger (32) for heat exchange and also provides power for the indoor hydraulic fan (12).

3. The air conditioning system according to claim 2, wherein A water pump (4) is arranged on the circulating water pipe (2), and the water pump (4) is located outdoors.

4. The air-conditioning system according to claim 2, characterized in that, The outdoor air conditioner (3) further includes a compressor (31) and a second outdoor heat exchanger (33). The compressor (31), the first outdoor heat exchanger (32), and the second outdoor heat exchanger (33) are all arranged on the refrigerant circulation loop. The water in the circulating water pipe exchanges heat with the refrigerant through the first outdoor heat exchanger; Alternatively, the first outdoor heat exchanger (32) is arranged on the circulating water pipe (2), and the water in the circulating water pipe (2) exchanges heat with outdoor air through the first outdoor heat exchanger (32).

5. A control method for an air conditioning system, characterized in that, The air conditioning system includes an indoor air conditioner (1), a circulating water pipe (2), and an outdoor air conditioner (3); The indoor air conditioner (1) includes an indoor heat exchanger (11) and an indoor hydraulic fan (12) for dissipating heat from the indoor heat exchanger (11); The outdoor air conditioner (3) includes a first outdoor heat exchanger (32); The indoor heat exchanger (11) and the indoor hydraulic fan (12) are respectively arranged on the circulating water pipe (2). The water in the circulating water pipe (2) flows between the indoor heat exchanger (11) and the first outdoor heat exchanger (32) for heat exchange and also provides power for the indoor hydraulic fan (12); a water pump (4) is arranged on the circulating water pipe (2), and the water pump (4) is located outdoors; The control method includes: Obtaining the inlet water temperature value and the outlet water temperature value of the circulating water pipe; Calculating the difference △T1 between the inlet water temperature value and the outlet water temperature value; Adjusting the water pump speed according to △T1.

6. The control method of the air conditioning system according to claim 5, wherein, The control method further includes: Obtaining the inlet water pressure value and the outlet water pressure value of the circulating water pipe; Calculating the difference △P1 between the inlet water pressure value and the outlet water pressure value; Judging whether the water system is faulty according to △P1; When the water system is faulty, controlling the air conditioning system to shut down.

7. The control method of the air conditioning system according to claim 5, wherein, The step of "adjusting the water pump speed according to △T1" further includes: When the air conditioner is cooling, if △T1 < the first preset temperature value, increase the water pump speed; if △T1 > the second preset temperature value, decrease the water pump speed; the first preset temperature value < the second preset temperature value; and / or, When the air conditioner is heating, if △T1 < the first preset temperature value, decrease the water pump speed; if △T1 > the second preset value, increase the water pump speed; the first preset temperature value < the second preset temperature value.

8. The control method of the air-conditioning system according to claim 7, characterized in that, The step of "adjusting the water pump speed according to △T1" further includes: When the second preset temperature value ≥ △T1 ≥ the first preset temperature value, keep the current water pump speed.

9. The control method of the air conditioning system according to claim 6, characterized in that, The step of "judging whether the water system is faulty according to △P1" further includes: When △P1 < the first preset pressure value, it indicates that the water system is faulty; When △P1 > the second preset pressure value, it indicates that the water system is faulty; where the first preset pressure value < the second preset pressure value.

10. The control method of the air-conditioning system according to claim 9, wherein, The step of "judging whether the water system is faulty according to △P1" further includes: When the second preset pressure value ≥ △P1 ≥ the first preset pressure value, it indicates that the water system is operating normally.

Images