Distributed air conditioning system tail end device capable of flexibly starting cooling and heating modes and adjusting cooling and heating modes

Abstract

The invention belongs to the technical field of air conditioning systems, and discloses a distributed adjustable air conditioning system terminal device capable of flexibly starting a cooling and heating mode, which comprises a heat exchanger, the heat exchanger is an outdoor unit, the heat exchanger comprises a condenser and an evaporator, and the output end of the heat exchanger is connected with a high-pressure air pipe, a low-pressure air pipe and a high-pressure liquid pipe; the output ends of the high-pressure air pipe, the low-pressure air pipe and the high-pressure liquid pipe are connected with a plurality of valve boxes; each valve box is connected with an indoor unit, the indoor units control the valve boxes to achieve connection and disconnection of the high-pressure air pipe, the low-pressure air pipe and the high-pressure liquid pipe, so that switching of refrigerating and heating of the indoor units is achieved, compared with a traditional system, energy is saved by 15%-30%, the refrigerant circulation efficiency is improved by 20%, and the energy-saving and environment-friendly effects are achieved. And the regional temperature difference is controlled within + / -0.5 DEG C, local supercooling / overheating is avoided, the effect of uniform temperature is achieved, the maintenance time is shortened by 50%, the failure rate is reduced by 40%, and the operation and maintenance cost is reduced due to the fact that maintenance parts are reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioning systems, and particularly relates to an end device of an air conditioning system with distributed and flexible enabling of adjustable cooling and heating modes. Background Art

[0002] With the diversification of building space functions and the improvement of users' demands for the indoor environment, traditional air conditioning end devices face significant challenges in terms of flexibility, energy efficiency, and comfort. Currently, most mainstream air conditioning systems adopt a centralized control mode, and the end devices usually can only perform a single cooling or heating function, making it difficult to meet the differentiated temperature control requirements of different regions. For example, in large office or residential scenarios, different spaces may need to achieve cooling and heating simultaneously at the same time. However, due to the lack of independent mode switching ability at the end of the traditional system, it leads to energy waste and a decline in user experience.

[0003] In the prior art, some manufacturers have tried to improve flexibility by adding multi-connected units or zoning control modules. However, such solutions often rely on complex pipeline designs and high-cost valve components, and it is difficult to achieve rapid response and precise temperature control. For example, although some distributed systems support the linkage of multiple indoor units, their valve box structures still have problems such as low switching efficiency and insufficient condensate water treatment, which are likely to cause equipment failures or energy efficiency attenuation. In addition, when the traditional end device switches between the cooling / heating modes, it often causes local temperature fluctuations or a reduction in energy utilization rate due to the lag in the adjustment of the refrigerant flow direction or unreasonable air flow organization.

[0004] In recent years, the industry has gradually paid attention to the modularization and intelligent upgrading of end devices. For example, by integrating variable air volume adjustment mechanisms or capillary heat exchange modules, the local heat exchange efficiency is optimized. However, such technologies mostly focus on the optimization of single functions and do not fundamentally solve the multi-mode coordination problem of end devices in distributed scenarios. At the same time, the existing patents have insufficient design for the maintenance convenience of end devices. For example, the maintenance of equipment in the ceiling requires the disassembly of structural components, increasing the operation and maintenance costs.

[0005] Under this background, there is an urgent need for an air conditioning end device that supports distributed and flexible switching, independent control, and is structurally compact, which can achieve rapid switching between cooling and heating modes through a modular valve box design, adapt to the differentiated requirements of multiple regions, and at the same time improve energy efficiency and maintenance convenience. Summary of the Invention

[0006] Aiming at the problems raised in the above background art, the purpose of the present invention is to provide an end device of an air conditioning system with distributed and flexible enabling of adjustable cooling and heating modes.

[0007] To achieve the above technical purpose, the technical solution adopted by the present invention is as follows:

[0008] A terminal device of an air conditioning system with a distributed and flexibly enabled adjustable cooling and heating mode, including a heat exchanger, where the heat exchanger is an outdoor unit, the heat exchanger includes a condenser and an evaporator, and the output end of the heat exchanger is connected with a high-pressure gas pipe, a low-pressure gas pipe and a high-pressure liquid pipe;

[0009] The output ends of the high-pressure gas pipe, the low-pressure gas pipe and the high-pressure liquid pipe are connected with a number of valve boxes;

[0010] Each valve box is connected with an indoor unit, and the indoor unit realizes the on-off of the high-pressure gas pipe, the low-pressure gas pipe and the high-pressure liquid pipe by controlling the valve box, so as to realize the switching between the cooling and heating of the indoor unit.

[0011] Further defined, in the single-cooling mode, the indoor unit that does not flow through the valve box and is only connected through the low-pressure gas pipe and the high-pressure liquid pipe is a single-cooling indoor unit. When the single-cooling indoor unit operates, the condenser starts and the evaporator stops.

[0012] Further defined, in the cooling mode, the indoor unit that flows through the valve box and is connected through the low-pressure gas pipe and the high-pressure liquid pipe is a cooling indoor unit. When the cooling indoor unit operates, the condenser starts and the evaporator stops.

[0013] Further defined, in the heating mode, the indoor unit that flows through the valve box and is connected through the high-pressure gas pipe and the high-pressure liquid pipe is a heating indoor unit. When the heating indoor unit operates, the condenser stops and the evaporator starts.

[0014] Further defined, in the regulation mode, the indoor unit that flows through the valve box and is not connected with the high-pressure gas pipe, the low-pressure gas pipe and the high-pressure liquid pipe is a control end.

[0015] Further defined, in the mixed mode, when the high-pressure gas pipe, the low-pressure gas pipe and the high-pressure liquid pipe all operate while flowing through the valve box, when the power of the low-pressure gas pipe is greater than that of the high-pressure gas pipe, mainly cooling is carried out, the condenser starts and the evaporator stops.

[0016] Further defined, in the mixed mode, when the high-pressure gas pipe, the low-pressure gas pipe and the high-pressure liquid pipe all operate while flowing through the valve box, when the power of the high-pressure gas pipe is equal to that of the low-pressure gas pipe, both cooling and heating are carried out simultaneously, and both the condenser and the evaporator stop.

[0017] Further defined, in the mixed mode, when the high-pressure gas pipe, the low-pressure gas pipe and the high-pressure liquid pipe all operate while flowing through the valve box, when the power of the low-pressure gas pipe is less than that of the high-pressure gas pipe, mainly heating is carried out, the condenser stops and the evaporator starts.

[0018] Further defined, each indoor unit connected to the valve box can only achieve one operating mode.

[0019] Further defined, each of the valve boxes is provided with a plurality of quick-connect interfaces.

[0020] Beneficial effects of adopting the present invention:

[0021] Adopting the solution of the present invention, compared with the traditional system, the energy consumption is reduced by 15%-30%, the refrigerant circulation efficiency is increased by 20%, achieving the purpose of energy efficiency improvement;

[0022] Adopting the solution of the present invention, the regional temperature difference is controlled within ±0.5°C, avoiding local overcooling / overheating, achieving the effect of uniform temperature.

[0023] Adopting the solution of the present invention, due to the reduction of maintenance parts, the maintenance time is reduced by 50%, the failure rate is decreased by 40%, and the operation and maintenance cost is reduced. Description of the drawings

[0024] The present invention can be further illustrated by the non-limiting embodiments given in the drawings;

[0025] Figure 1 It is a schematic structural diagram of an embodiment of the end device of an air-conditioning system with a distributed flexible enabling of adjustable cooling and heating modes according to the present invention;

[0026] The main element symbols are explained as follows:

[0027] Heat exchanger 1; condenser 2; evaporator 3; high-pressure gas pipe 4; low-pressure gas pipe 5; high-pressure liquid pipe 6; indoor unit 7; valve box 8;

[0028] Single-cooling indoor unit 71; refrigeration indoor unit 72; heating indoor unit 73; control end 74. Detailed implementation manners

[0029] In order to enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be further described below with reference to the drawings and embodiments.

[0030] Embodiment 1:

[0031] As Figure 1 shown, an end device of an air-conditioning system with a distributed flexible enabling of adjustable cooling and heating modes according to the present invention includes a heat exchanger 1. The heat exchanger 1 is an outdoor unit, and the heat exchanger 1 includes a condenser 2 and an evaporator 3. The output ends of the heat exchanger 1 are connected with a high-pressure gas pipe 4, a low-pressure gas pipe 5 and a high-pressure liquid pipe 6;

[0032] The output ends of the high-pressure gas pipe 4, the low-pressure gas pipe 5 and the high-pressure liquid pipe 6 are connected with a plurality of valve boxes 8;

[0033] Each valve box 8 is connected to an indoor unit 7. The indoor unit 7 controls the on / off of the high-pressure gas pipe 4, the low-pressure gas pipe 5, and the high-pressure liquid pipe 6 through the control valve box 8, so as to realize the switching between refrigeration and heating of the indoor unit 7.

[0034] The condenser 2 and the evaporator 3 are sub-types of heat exchangers, but their functions and action directions are opposite. The core function of the condenser 2 is to cool the high-temperature gaseous refrigerant into a liquid state and release heat to the outside world. During the heat release process, it ensures that the refrigerant completes the phase change and enters the next cycle; while the core function of the evaporator 3 is to absorb heat and evaporate the liquid refrigerant into a gaseous state, absorbing the heat of the cooled medium. During the heat absorption process, it realizes the temperature reduction of the target area.

[0035] Through the control of the valve box 8, the condenser 2 and the evaporator 3 cooperate with the on / off of the high-pressure gas pipe 4, the low-pressure gas pipe 5, and the high-pressure liquid pipe 6 to realize the refrigeration, heating and cooling and heating switching of the corresponding indoor unit 7. This switching can enable the selection of the corresponding heat exchanger 1 for use at the corresponding temperature, thereby achieving the purpose of distributed flexible switching and independent control.

[0036] Embodiment 2:

[0037] As Figure 1 shown, in the preferred single-cooling mode, the indoor unit 7 that is not connected to the valve box 8 and is only connected through the low-pressure gas pipe 5 and the high-pressure liquid pipe 6 is the single-cooling indoor unit 71. When the single-cooling indoor unit 71 operates, the condenser 2 starts and the evaporator 3 stops. In this state, it is not controlled by the valve box 8 and cannot be switched, but it can achieve the refrigeration purpose. This method correspondingly reduces the purchase and installation costs of components and the pipeline laying costs, and is suitable for use in constant-temperature refrigerated warehouses. In fact, the installation quantity of the single-cooling indoor unit 71 can be considered according to specific circumstances.

[0038] Embodiment 3:

[0039] As Figure 1 shown, in the preferred refrigeration mode, the indoor unit that flows through the valve box 8 and is connected through the low-pressure gas pipe 5 and the high-pressure liquid pipe 6 is the refrigeration indoor unit 72. When the refrigeration indoor unit 72 operates, the condenser 2 starts and the evaporator 3 stops. In this state, there is no heating load, so the condenser 2 can be not used, thus saving energy. In fact, the quantity and installation position of the refrigeration indoor unit 72 can also be considered according to specific circumstances.

[0040] Embodiment 4:

[0041] As Figure 1As shown, in the preferred heating mode, the indoor unit that flows through the valve box 8 and is connected by the high-pressure gas pipe 4 and the high-pressure liquid pipe 6 is the heating indoor unit 73. When the heating indoor unit 73 operates, the condenser 2 stops and the evaporator 3 starts. In this state, there is no cooling load, so the evaporator 3 can be not used, thus saving energy. In fact, the number and installation position of the heating indoor unit 73 can also be considered according to specific circumstances.

[0042] Example Five:

[0043] As Figure 1 shown, in the regulation mode, the indoor unit that flows through the valve box 8 and is not connected by the high-pressure gas pipe 4, the low-pressure gas pipe 5, and the high-pressure liquid pipe 6 is the control terminal 74. As a regulation terminal, it can perform forced control according to its own needs to cover the self-regulation of the equipment. Preferably, in fact, the position of the control terminal 74 can also be considered according to specific circumstances.

[0044] Example Six:

[0045] As Figure 1 shown, in the preferred hybrid mode, when the high-pressure gas pipe 4, the low-pressure gas pipe 5, and the high-pressure liquid pipe 6 all operate while flowing through the valve box 8, when the power of the low-pressure gas pipe 5 is greater than that of the high-pressure gas pipe 4, mainly cooling is carried out, the condenser 2 starts, and the evaporator 3 stops. In this state, the cooling load plus the power of the compressor is less than the heating load, so the low-pressure gas pipe 5 needs to be increased to achieve the main cooling effect. Therefore, the heat exchanger is selected as the condenser 2, and its cooling effect is better than that of the evaporator 3, with corresponding lower cooling efficiency and energy consumption, and the cold air effect discharged from the cooling indoor unit 72 is better. In fact, the position and number of the cold indoor unit 72 can also be considered according to specific circumstances.

[0046] Example Seven:

[0047] As Figure 1 shown, in the preferred hybrid mode, when the high-pressure gas pipe 4, the low-pressure gas pipe 5, and the high-pressure liquid pipe 6 all operate while flowing through the valve box 8, when the power of the high-pressure gas pipe 4 is equal to that of the low-pressure gas pipe 5, both cooling and heating are carried out simultaneously, and both the condenser 2 and the evaporator 3 stop. In this state, the cooling load plus the power of the compressor is equal to the heating load. Therefore, there is no need for cooling and heating, and the heat exchanger 1 does not operate to achieve the purpose of saving energy. The cooling indoor unit 72 and the heating indoor unit 73 do not operate or ventilate to achieve a comfortable use environment. In fact, the position and number of the cooling indoor unit 72 and the heating indoor unit 73 can also be considered according to specific circumstances.

[0048] Example Eight:

[0049] As Figure 1As shown, in the preferred hybrid mode, when flowing through the valve box 8 and the high-pressure air pipe 4, low-pressure air pipe 5, and high-pressure liquid pipe 6 are all operating, when the power of the low-pressure air pipe 5 is less than that of the high-pressure air pipe 4, heating mainly occurs. The condenser 2 stops and the evaporator 3 starts. In this state, the refrigeration load plus the compressor power is greater than the heating load. Therefore, the high-pressure air pipe 4 needs to be increased to achieve the main heating effect. So, the heat exchanger is selected as the evaporator 3, whose heating effect is better than that of the condenser 2, with corresponding lower heating efficiency and energy consumption, and better cold air effect discharged from the heating indoor unit 73. In fact, the position and quantity of the heating indoor unit 73 can also be considered according to specific circumstances.

[0050] Embodiment Nine:

[0051] As Figure 1 shown, it is preferred that each indoor unit 7 connected to the valve box 8 can only achieve one operating mode. Since each indoor unit under the valve box can only operate in one mode, either refrigeration or heating, the system can more precisely adjust the temperature, avoid unnecessary energy waste, and thus improve energy efficiency. The operation in a single mode helps to maintain the stability of the system. In the case of frequent switching between the refrigeration and heating modes, the system may need to be continuously adjusted, which may lead to component wear and reduced energy efficiency. By restricting the operating mode of the indoor unit under each valve box, this wear can be reduced, the equipment life can be extended, and the frequent adjustment and wear of the system components can be reduced, which can lower the maintenance frequency and cost. The system is more stable and the failure rate will also be correspondingly reduced. When operating in a single mode, the system can more precisely control the indoor temperature, thus enhancing the user's comfort. In fact, the selection of the indoor unit 7 can also be considered according to specific circumstances.

[0052] Embodiment Ten:

[0053] As Figure 1As shown, it is preferred that each valve box 8 is provided with a plurality of quick-connect interfaces. The quick-connect interfaces adopt a plug-in design, which does not require complex welding or special tools, greatly shortens the installation time and reduces the labor cost. It is especially suitable for operations in concealed spaces such as suspended ceilings. Through prefabricated standardized interfaces, processes such as pipe cutting and nitrogen-flushing welding are reduced, and the risk of refrigerant leakage caused by poor welding technology is avoided. The quick-connect interfaces support modular replacement. If a certain section of the pipeline or valve box fails, the corresponding interface can be directly disassembled for repair without damaging the overall structure or extensively disassembling the suspended ceiling. All interfaces are concentrated at the valve box, which is convenient for centralized monitoring and maintenance, reduces the probability of refrigerant leakage, and at the same time reduces the difficulty of troubleshooting. The multi-interface design supports various pipeline combination methods such as branch connection and parallel connection, and can adapt to the load requirements of different regions or the increase and decrease adjustment of terminal equipment. The quick-connect interfaces usually cover a variety of specifications, allowing the mixed use of pipelines of different materials such as copper pipes and aluminum pipes, improving the freedom of system design. High-quality quick-connect interfaces adopt sealing rings or locking structures to ensure no leakage or abnormal pressure drop during refrigerant flow and maintain the system circulation efficiency. In fact, the connection method can also be considered according to specific circumstances.

[0054] The above embodiments are only used to exemplarily illustrate the principles and effects of the present invention, rather than to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A distributed air conditioning system terminal device with flexible cooling and heating modes, comprising a heat exchanger (1), the heat exchanger (1) being an outdoor unit, the heat exchanger (1) comprising a condenser (2) and an evaporator (3), characterized in that: The output end of the heat exchanger (1) is connected to a high-pressure gas pipe (4), a low-pressure gas pipe (5) and a high-pressure liquid pipe (6); The output ends of the high-pressure air pipe (4), the low-pressure air pipe (5) and the high-pressure liquid pipe (6) are connected to a plurality of valve boxes (8); Each of the valve boxes (8) is connected to an indoor unit (7), and the indoor unit (7) controls the valve box (8) to open and close the high-pressure gas pipe (4), the low-pressure gas pipe (5) and the high-pressure liquid pipe (6), thereby realizing the switching of cooling and heating of the indoor unit (7).

2. According to claim 1, a distributed air conditioning system terminal device with flexible cooling and heating modes, characterized in that: In the cooling-only mode, the indoor unit (7) that does not flow through the valve box (8) and is connected only through the low-pressure gas pipe (5) and the high-pressure liquid pipe (6) is a cooling-only indoor unit (71). When the cooling-only indoor unit (71) is in operation, the condenser (2) is started and the evaporator (3) is stopped.

3. According to claim 1, a distributed air conditioning system terminal device with flexible cooling and heating modes, characterized in that: In the cooling mode, the indoor unit that flows through the valve box (8) and is connected through the low-pressure gas pipe (5) and the high-pressure liquid pipe (6) is a cooling indoor unit (72). When the cooling indoor unit (72) is in operation, the condenser (2) is started and the evaporator (3) is stopped.

4. According to claim 1, a distributed air conditioning system terminal device with flexible cooling and heating modes, characterized in that: In the heating mode, the indoor unit that flows through the valve box (8) and is connected through the high-pressure gas pipe (4) and the high-pressure liquid pipe (6) is a heating indoor unit (73). When the heating indoor unit (73) is in operation, the condenser (2) stops and the evaporator (3) starts.

5. According to claim 1, a distributed air conditioning system terminal device with flexible cooling and heating modes, characterized in that: In the control mode, the indoor unit that flows through the valve box (8) and is not connected to the high-pressure gas pipe (4), the low-pressure gas pipe (5) and the high-pressure liquid pipe (6) is the control end (74).

6. According to claim 1, a distributed air conditioning system terminal device with flexible cooling and heating modes, characterized in that: In the mixed mode, when the gas flows through the valve box (8), the high-pressure gas pipe (4), the low-pressure gas pipe (5) and the high-pressure liquid pipe (6) are all in operation, when the power of the low-pressure gas pipe (5) is greater than that of the high-pressure gas pipe (4), refrigeration is mainly performed, the condenser (2) is started, and the evaporator (3) is stopped.

7. According to claim 1, a distributed air conditioning system terminal device with flexible cooling and heating modes, characterized in that: In the mixed mode, when the gas flows through the valve box (8), the high-pressure gas pipe (4), the low-pressure gas pipe (5) and the high-pressure liquid pipe (6) are all in operation, when the power of the high-pressure gas pipe (4) is equal to that of the low-pressure gas pipe (5), cooling and heating are performed simultaneously, and the condenser (2) and the evaporator (3) are both stopped.

8. According to claim 1, a distributed air conditioning system terminal device with flexible cooling and heating modes, characterized in that: In the mixed mode, when the gas flows through the valve box (8), the high-pressure gas pipe (4), the low-pressure gas pipe (5) and the high-pressure liquid pipe (6) are all in operation, when the power of the low-pressure gas pipe (5) is less than that of the high-pressure gas pipe (4), heating is mainly performed, the condenser (2) is stopped, and the evaporator (3) is started.

9. According to claim 1, a distributed air conditioning system terminal device with flexible cooling and heating modes, characterized in that: The indoor unit (7) connected to each valve box (8) can only realize one operation mode.

10. The distributed air conditioning system terminal device with flexible cooling and heating modes according to claim 1, characterized in that: Each valve box (8) is provided with a plurality of quick-connection interfaces.

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