Air treatment equipment and control method thereof

Abstract

The present invention relates to an air treatment device and a control method thereof, and relates to the field of air conditioning technology, and is used to realize dual evaporation temperature refrigeration, reheat temperature control dehumidification, heating and other functions. The air treatment device of the present invention includes a switching device, a first valve, a second valve, a second heat exchanger and a first heat exchanger; the switching device, the first valve, the second valve, the second heat exchanger and the first heat exchanger are connected to form a refrigerant flow circuit; the switching device can switch between a first state and a second state, and the first valve and the second valve can be turned on or off respectively, so that the air treatment device can switch between multiple operating modes. Compared with the existing technology, the advantage of the present invention is that it realizes dual evaporation temperature refrigeration, reheat temperature control dehumidification, heating and other functions while reducing the number of connecting pipes and four-way valve electronic components, meets the requirements for air temperature and humidity control, is low in cost, time-consuming to install, and requires less refrigerant filling.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air treatment device and a control method thereof. Background Art

[0002] Traditional fresh air air conditioning systems typically use vapor compression cooling and dehumidification, using a single evaporation temperature to handle both the sensible and latent heat loads of the fresh air. This makes it difficult to simultaneously regulate both humidity and temperature. Often limited by the outlet dew point temperature requirement, the unit's evaporation temperature is typically low, and the outlet air temperature is also low, resulting in poor comfort.

[0003] Some fresh air air-conditioning equipment adopts a variety of three-way pipe systems: ① No four-way valve system solution, can only operate in reheat dehumidification mode, high design cost, and poor system versatility; ② Single four-way valve system solution, can only operate in reheat dehumidification and heating modes, high design cost, limited cooling capacity, and general system versatility; ③ Double four-way valve system solution, dual evaporation temperature cooling, reheat dehumidification, and heating modes can be realized, but the system is relatively complex, with more system control components, reduced product reliability, and high design cost. Summary of the Invention

[0004] The present invention provides an air handling device for realizing dual evaporation temperature refrigeration, reheat temperature control dehumidification, heating and other functions, meeting the requirements for air temperature and humidity control, and solving the problem of complex structure of existing fresh air air conditioning equipment.

[0005] The present invention provides an air treatment device, comprising:

[0006] A switching device, a first valve, a second valve, a second heat exchanger, and a first heat exchanger; the switching device has at least four interfaces, and the first interface and the second interface of the switching device are respectively connected to the first side of the first valve and the first side of the second valve;

[0007] The second side of the first valve and the second side of the second valve are both connected to the first side of the second heat exchanger;

[0008] The first side of the first valve is further connected to the first side of the first heat exchanger, the second side of the second heat exchanger is further connected to the second side of the first heat exchanger and the first side of the second valve, respectively, and the second side of the first heat exchanger is further connected to the first side of the second valve to form a refrigerant flow circuit;

[0009] The switching device can switch between a first state and a second state, and the first valve and the second valve can be turned on or off respectively, so that the air treatment equipment can switch between multiple operating modes.

[0010] In one embodiment, in the first state, the first interface of the switching device is connected to the third interface and the second interface of the switching device is connected to the fourth interface, the first valve is turned on, and the second valve is turned off.

[0011] In one embodiment, in the second state, the first interface of the switching device is connected to the fourth interface and the second interface of the switching device is connected to the third interface, the first valve is disconnected, and the second valve is connected.

[0012] In one embodiment, it also includes a compressor and a third heat exchanger, the output interface and input interface of the compressor are respectively connected to the third interface and the fourth interface of the switching device; the first side of the third heat exchanger is connected to the second interface of the switching device, and the second side of the third heat exchanger is respectively connected to the first side of the second valve, the second side of the first heat exchanger and the second side of the second heat exchanger.

[0013] In one embodiment, a first air supply device is further included, and the third heat exchanger is arranged on the flow path of the air flow formed by the first air supply device. The air supply device can be a blower or a fan.

[0014] In one embodiment, the system further includes a first temperature sensor and a second temperature sensor, wherein the first temperature sensor is used to measure the temperature of the environment where the third heat exchanger is located, and the second temperature sensor is used to measure the temperature of the third heat exchanger.

[0015] In one embodiment, the system further comprises a second air supply device, wherein the second heat exchanger and the first heat exchanger are arranged on a flow path of an air flow formed by the second air supply device. The air supply device can be a blower or a fan.

[0016] In one embodiment, a third temperature sensor and a fourth temperature sensor are further included, wherein the third temperature sensor is used to measure the temperature of the first heat exchanger, and the fourth temperature sensor is used to measure the temperature of the airflow after passing through the second heat exchanger.

[0017] In one embodiment, a fifth temperature sensor is further included, wherein the fifth temperature sensor is used to measure the exhaust temperature of the compressor.

[0018] In one embodiment, it also includes a first throttling device, a second throttling device and a third throttling device; the first side and the second side of the first throttling device are respectively connected to the second interface of the switching device and the first side of the second valve; the first side of the second throttling device is connected to the second interface of the switching device, and the second side of the second throttling device is respectively connected to the second side of the first heat exchanger and the second side of the third throttling device; the first side of the third throttling device is connected to the second side of the second heat exchanger, and the second side of the third throttling device is also connected to the second side of the first heat exchanger.

[0019] In one embodiment, the first throttling device, the second throttling device and the third throttling device are electronic expansion valves.

[0020] In one embodiment, a third valve and a fourth valve are further included; the first side of the third valve is connected to the first interface of the switching device, and the second side of the third valve is respectively connected to the first side of the first valve and the first side of the first heat exchanger; the first side of the fourth valve is connected to the second interface of the switching device, and the second side of the fourth valve is respectively connected to the first side of the second valve, the second side of the second heat exchanger and the second side of the first heat exchanger.

[0021] In one embodiment, the first valve and the second valve are one-way valves, and outflow ends of the first valve and the second valve are both connected to the first side of the second heat exchanger.

[0022] In one embodiment, the switching device is a four-way valve.

[0023] The present invention also provides a control method for the air treatment equipment as described above, comprising the following steps:

[0024] controlling the switching device to switch between a first state and a second state, and

[0025] The first valve and the second valve are controlled to be on or off respectively to change the flow direction of the refrigerant in the flow circuit, thereby enabling the air handling device to switch between multiple operating modes.

[0026] Compared with the existing technology, the advantages of the present invention lie in its use of a two-valve system, with the indoor and outdoor units connected by two pipes. This reduces the number of connecting pipes and four-way valve electronic components, while achieving dual evaporation temperature cooling, reheat temperature control dehumidification, and heating functions, meeting the requirements for air temperature and humidity control. It is low-cost, time-consuming to install, and requires less refrigerant charge. Precise temperature and humidity control are possible in cooling and dehumidification modes; precise temperature control is possible in heating mode, and temperature and humidity control can also be achieved with an external humidification module. Refrigerant flow direction switching is achieved through one-way valve reversing, utilizing the principle of refrigerant on-off by the pressure difference of the one-way valve, without the need for additional connecting pipes and four-way valves. Compared with solutions that control refrigerant flow entirely through electronic components, the product design of the present invention offers lower cost and higher reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Hereinafter, the present invention will be described in more detail based on embodiments with reference to the accompanying drawings.

[0028] Figure 1 is a structural schematic diagram of an air treatment device in an embodiment of the present invention;

[0029] Figure 2 Schematic diagram of the system structure of the air handling equipment of the present invention in high-load cooling mode and temperature and humidity control mode;

[0030] Figure 3 Schematic diagram of the system structure of the air handling equipment of the present invention in low-load cooling mode;

[0031] Figure 4 Schematic diagram of the system structure of the air treatment equipment of the present invention in low-temperature heating mode;

[0032] Figure 5 It is a schematic diagram of the system structure of the air treatment equipment of the present invention in the normal temperature heating mode.

[0033] Reference numerals:

[0034] 1. Compressor; 2. Third heat exchanger; 3. First fan; 4. First temperature sensor; 5. Second temperature sensor; 6. Second fan; 7. First heat exchanger; 8. Third temperature sensor; 9. Second throttling device; 10. Third throttling device; 11. Second heat exchanger; 12. Fourth temperature sensor; 13. First one-way valve; 14. Second one-way valve; 15. First throttling device; 16. Third valve; 17. Four-way valve; 18. Fifth temperature sensor; 19. Fourth valve; 20. First interface; 21. Second interface; 22. Third interface; 23. Fourth interface; 24. First intersection; 25. Second intersection; 26. Third intersection; 27. Fourth intersection; 28. First connecting pipe; 29. Second connecting pipe. DETAILED DESCRIPTION

[0035] The present invention will be further described below with reference to the accompanying drawings.

[0036] like Figure 1 As shown, the present invention provides an air handling device including an outdoor unit and an indoor unit. The indoor unit and the outdoor unit are connected by a first connecting pipe 28 and a second connecting pipe 29 to form a refrigerant flow circuit. A third valve 16 and a fourth valve 19 are respectively provided on the first connecting pipe 28 and the second connecting pipe 29. The third valve 16 and the fourth valve 19 are respectively used to control the opening and closing of the first connecting pipe 28 and the second connecting pipe 29.

[0037] The outdoor unit mainly includes a compressor 1 , a third heat exchanger 2 , a four-way valve 17 and a first fan 3 .

[0038] The output interface of the compressor 1 is connected to the third interface 22 of the four-way valve 17 through a pipeline, and the input interface of the compressor 1 is connected to the fourth interface 23 of the four-way valve 17 through a pipeline; the first interface 20 of the four-way valve 17 is connected to the indoor unit through a first connecting pipeline 28, the second interface 21 of the four-way valve 17 is connected to the first side of the third heat exchanger 2 through a pipeline, and the second side of the third heat exchanger 2 is connected to the indoor unit through a second connecting pipeline 29.

[0039] The four-way valve 17 can be switched between a first state and a second state. In the first state, the first port 20 of the four-way valve 17 is connected to the third port 22, and the second port 21 of the switching device is connected to the fourth port 23. In the second state, the first port 20 of the four-way valve 17 is connected to the fourth port 23, and the second port 21 is connected to the third port 22.

[0040] When the first fan 3 is in operation, it forms an airflow path, and the third heat exchanger 2 is disposed in this airflow path. The outdoor unit also includes a first temperature sensor 4, a second temperature sensor 5, and a fifth temperature sensor 18. The first temperature sensor 4 is used to measure the ambient temperature of the third heat exchanger 2, i.e., the outdoor temperature. The second temperature sensor 5 is used to measure the temperature of the third heat exchanger 2. The fifth temperature sensor 18 is used to measure the exhaust temperature of the compressor 1.

[0041] The indoor unit includes a first one-way valve 13 , a second one-way valve 14 , a second heat exchanger 11 , a first heat exchanger 7 , a first throttling device 15 , a second throttling device 9 , a third throttling device 10 and a second fan 6 .

[0042] The first connecting pipe 28 is sequentially connected to the first one-way valve 13, the second heat exchanger 11, the first throttling device 15, the second throttling device 9, and the second connecting pipe 29. A first intersection 24 is provided on the first connecting pipe 28, and a second intersection 25 is provided on the connecting pipe between the second throttling device 9 and the third throttling device 10. The first intersection 24 is sequentially connected to the first heat exchanger 7 and the second intersection 25 via pipes. A third intersection 26 is provided on the second connecting pipe 29, and a fourth intersection 27 is provided on the connecting pipe between the first one-way valve 13 and the second heat exchanger 11. The third intersection 26 is sequentially connected to the first throttling device 15, the second one-way valve 14, and the fourth intersection 27 via pipes. The inflow ends of the first one-way valve 13 and the second one-way valve 14 are connected to the first port 20 and the second port 21 of the valve via a first connecting pipe 28 and a second connecting pipe 29, respectively. The outflow ends of the first one-way valve 13 and the second one-way valve 14 are both connected to the same side of the second heat exchanger 11, allowing the refrigerant to flow through the one-way valves to the second heat exchanger 11. Preferably, the first throttling device 15, the second throttling device 9, and the third throttling device 10 are all electronic expansion valves.

[0043] When the second fan 6 operates, it forms an airflow path. The first heat exchanger 7 and the second heat exchanger 11 are sequentially arranged along the airflow path. The indoor unit also includes a third temperature sensor 8 and a fourth temperature sensor 12. The third temperature sensor 8 is used to measure the temperature of the first heat exchanger 7, and the fourth temperature sensor 12 is used to measure the temperature of the airflow after passing through the second heat exchanger 11.

[0044] Four-way valve 17 can switch between a first state and a second state, and first and second one-way valves 13 and 14 can be opened or closed, respectively, to enable the air handling equipment to switch between multiple operating modes. In the first state, first port 20 of four-way valve 17 is connected to third port 22, and second port 21 is connected to fourth port 23. First one-way valve 13 is open, and second one-way valve 14 is closed. In the second state, first port 20 of four-way valve 17 is connected to fourth port 23, and second port 21 is connected to third port 22. First one-way valve 13 is closed, and second one-way valve 14 is open.

[0045] The air handling unit has five operating modes.

[0046] (1) High load cooling mode

[0047] like Figure 2 As shown, the four-way valve 17 is in the second state, the first port 20 of the four-way valve 17 is in communication with the fourth port 23 , and the second port 21 is in communication with the third port 22 .

[0048] After being drawn into the input port of compressor 1, low-pressure, low-temperature refrigerant is compressed by compressor 1 into high-temperature, high-pressure vapor refrigerant and discharged from the output port. It then passes through four-way valve 17 and flows through third heat exchanger 2 for condensation and heat exchange, cooling it to high-pressure, medium-temperature refrigerant. Within the indoor unit, the refrigerant undergoes heat exchange in two separate paths. One path flows to second throttling device 9, where it becomes a low-temperature, low-pressure vapor-liquid two-phase state. It then flows to first heat exchanger 7 for a first cooling of the incoming air. The other path flows to first throttling device 15, where it also becomes a low-temperature, low-pressure vapor-liquid two-phase state. It then passes through second one-way valve 14 and flows to second heat exchanger 11 for a second cooling of the incoming air. First one-way valve 13 blocks the flow of refrigerant, allowing the refrigerant, which has absorbed heat, to flow through third throttling device 10 to first heat exchanger 7 for further heat absorption (here, third throttling device 10 is fully opened, not throttling the refrigerant). After absorbing heat in first heat exchanger 7, the refrigerant becomes low-pressure, low-temperature refrigerant and returns to the input port of compressor 1 through four-way valve 17, completing a refrigeration cycle.

[0049] (2) Low load cooling mode

[0050] like Figure 3 As shown, the four-way valve 17 is in the second state, the first port 20 of the four-way valve 17 is in communication with the fourth port 23 , and the second port 21 is in communication with the third port 22 .

[0051] After the low-pressure, low-temperature refrigerant is sucked in from the input interface of the compressor 1, it is compressed by the compressor 1 into a high-temperature, high-pressure vapor refrigerant and discharged from the output interface. It flows through the third heat exchanger 2 through the four-way valve 17 for condensation and heat exchange, and is cooled to a high-pressure, medium-temperature refrigerant. In this mode, the third throttling device 10 is completely closed, and the refrigerant cannot flow from the first throttling device 15, the second one-way valve 14, the second heat exchanger 11 to the third throttling device 10, so the refrigerant cannot cool the fresh air at the second internal heat exchanger. The refrigerant flows to the second throttling device 9 in another way, and the refrigerant becomes a low-temperature, low-pressure vapor-liquid two-phase state, and then flows to the first heat exchanger 7 to cool the fresh air once. After absorbing heat in the first heat exchanger 7, the refrigerant becomes a low-pressure, low-temperature refrigerant and returns to the input interface of the compressor 1 through the four-way valve 17, completing a refrigeration cycle.

[0052] (3) Temperature and humidity control mode

[0053] See also Figure 2 The refrigerant flow direction in this mode is exactly the same as that in the high-load refrigeration mode, but different control methods are used for the first throttling device 15, the second throttling device 9, and the third throttling device 10.

[0054] At this time, the second throttling device 9 is the main throttling part, and the refrigerant temperature is lower than that at the first throttling device 15. The low-temperature and low-pressure refrigerant cools and dehumidifies the fresh air at the first heat exchanger 7.

[0055] At the same time, the first throttling device 15 is opened to the maximum, and the refrigerant is not throttled and cooled. The high-temperature and high-pressure refrigerant flows to the second heat exchanger 11 through the second one-way valve 14, and the low-temperature and low-humidity fresh air is heated and reheated. After absorbing heat, the refrigerant becomes a high-pressure normal temperature state, and is throttled and cooled by the third throttling device 10. At this time, the refrigerant state is consistent with the refrigerant at the second throttling device 9. After being aggregated, the fresh air is cooled and dehumidified in the first heat exchanger 7, and then returns to the input interface of the compressor 1 through the four-way valve 17, completing a temperature and humidity control cycle.

[0056] In this mode, the opening of the third throttling device 10 will be continuously adjusted according to the target air outlet temperature value. When the heating amount of the second heat exchanger 11 is insufficient, the first fan 3 will simultaneously reduce the fan speed, thereby improving the heat exchange capacity of the second heat exchanger 11 by reducing the heat exchange amount of the third heat exchanger 2.

[0057] (4) Low temperature heating mode

[0058] like Figure 4 As shown, the four-way valve 17 is in the first state, the first port 20 of the four-way valve 17 is in communication with the third port 22 , and the second port 21 is in communication with the fourth port 23 .

[0059] After being drawn into the input port of compressor 1, low-pressure, low-temperature refrigerant is compressed by compressor 1 into a high-temperature, high-pressure vapor refrigerant, which is discharged from the output port. It then passes through four-way valve 17, switching its direction and flowing in two directions, to the first check valve 13 and the first heat exchanger 7. One path of refrigerant releases heat to the low-temperature fresh air at the first heat exchanger 7, becoming a low-temperature, high-pressure vapor before flowing to the second throttle device 9. The other path of refrigerant passes through the first check valve 13 and releases heat to the fresh air at the second heat exchanger 11, raising the outlet air temperature. The refrigerant then flows through the third throttle device 10 (which is now fully opened, without throttling or cooling the refrigerant) to the second throttle device 9, which becomes the primary throttling element, converting the refrigerant to a low-temperature, low-pressure vapor before flowing to the outdoor unit. The refrigerant absorbs heat at the third heat exchanger 2, becoming a low-temperature, low-pressure vapor before returning to the input port of compressor 1 through the four-way valve 17, completing a heating cycle.

[0060] (5) Normal temperature heating mode

[0061] like Figure 5 As shown, the four-way valve 17 is in the first state, the first port 20 of the four-way valve 17 is in communication with the third port 22 , and the second port 21 is in communication with the fourth port 23 .

[0062] After the low-pressure and low-temperature refrigerant is sucked in from the input interface of the compressor 1, it is compressed by the compressor 1 into a high-temperature and high-pressure vapor refrigerant and discharged from the output interface. It is reversed by the four-way valve 17 and flows in two ways to the first one-way valve 13 and the first heat exchanger 7. In this mode, the third throttling device 10 is completely closed, and the refrigerant cannot flow from the first one-way valve 13 and the second heat exchanger 11 to the third throttling device 10. Therefore, the fresh air cannot be heated at the second heat exchanger 11 of the refrigerant. The other refrigerant releases heat to the low-temperature fresh air for the first time at the first heat exchanger 7, and flows into a low-temperature and high-pressure state to the second throttling device 9; the refrigerant only heats the fresh air once at the first heat exchanger 7.

[0063] While the present invention has been described with reference to preferred embodiments, various modifications may be made and equivalent components may be substituted without departing from the scope of the present invention. In particular, the various technical features described in the various embodiments may be combined in any manner, provided no structural conflicts exist. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. An air treatment device, characterized in that: The device comprises a switching device, a first valve, a second valve, a second heat exchanger and a first heat exchanger; the switching device has at least four interfaces, and the first interface and the second interface of the switching device are connected to the first side of the first valve and the first side of the second valve respectively; The second side of the first valve and the second side of the second valve are both connected to the first side of the second heat exchanger; The first side of the first valve is further connected to the first side of the first heat exchanger, the second side of the second heat exchanger is further connected to the second side of the first heat exchanger and the first side of the second valve, respectively, and the second side of the first heat exchanger is further connected to the first side of the second valve to form a refrigerant flow circuit; The switching device can switch between a first state and a second state, and the first valve and the second valve can be respectively turned on or off, so that the air treatment device can switch between multiple operating modes; In the first state, the first interface of the switching device is connected to the third interface and the second interface of the switching device is connected to the fourth interface, the first valve is turned on, and the second valve is turned off; In the second state, the first interface of the switching device is connected to the fourth interface and the second interface of the switching device is connected to the third interface, the first valve is disconnected, and the second valve is connected.

2. The air treatment equipment according to claim 1, characterized in that It also includes a compressor and a third heat exchanger, the output interface and input interface of the compressor are respectively connected to the third interface and fourth interface of the switching device; the first side of the third heat exchanger is connected to the second interface of the switching device, and the second side of the third heat exchanger is respectively connected to the first side of the second valve, the second side of the first heat exchanger and the second side of the second heat exchanger.

3. The air treatment equipment according to claim 2, characterized in that It also includes a first air supply device, and the third heat exchanger is arranged on the flow path of the air flow formed by the first air supply device.

4. The air treatment equipment according to claim 3, characterized in that It also includes a first temperature sensor and a second temperature sensor, wherein the first temperature sensor is used to measure the temperature of the environment where the third heat exchanger is located, and the second temperature sensor is used to measure the temperature of the third heat exchanger.

5. The air treatment equipment according to claim 1, characterized in that It also includes a second air supply device, and the second heat exchanger and the first heat exchanger are arranged on a flow path of the air flow formed by the second air supply device.

6. The air treatment equipment according to claim 5, characterized in that The system further includes a third temperature sensor and a fourth temperature sensor. The third temperature sensor is used to measure the temperature of the first heat exchanger, and the fourth temperature sensor is used to measure the temperature of the airflow after passing through the second heat exchanger.

7. The air treatment equipment according to claim 3, characterized in that A fifth temperature sensor is further included, and the fifth temperature sensor is used to measure the exhaust temperature of the compressor.

8. The air treatment equipment according to claim 1, characterized in that It also includes a first throttling device, a second throttling device and a third throttling device; the first side and the second side of the first throttling device are respectively connected to the second interface of the switching device and the first side of the second valve; the first side of the second throttling device is connected to the second interface of the switching device, and the second side of the second throttling device is respectively connected to the second side of the first heat exchanger and the second side of the third throttling device; the first side of the third throttling device is connected to the second side of the second heat exchanger, and the second side of the third throttling device is also connected to the second side of the first heat exchanger.

9. The air treatment equipment according to claim 8, characterized in that The first throttling device, the second throttling device and the third throttling device are electronic expansion valves.

10. The air treatment equipment according to claim 1, characterized in that It also includes a third valve and a fourth valve; the first side of the third valve is connected to the first interface of the switching device, and the second side of the third valve is respectively connected to the first side of the first valve and the first side of the first heat exchanger; the first side of the fourth valve is connected to the second interface of the switching device, and the second side of the fourth valve is respectively connected to the first side of the second valve, the second side of the second heat exchanger and the second side of the first heat exchanger.

11. The air treatment equipment according to any one of claims 1 to 10, characterized in that: The first valve and the second valve are one-way valves, and outflow ends of the first valve and the second valve are both connected to the first side of the second heat exchanger.

12. The air treatment equipment according to any one of claims 1 to 10, characterized in that: The switching device is a four-way valve.

13. A method for controlling an air treatment device according to any one of claims 1 to 12, characterized in that: The following steps are involved: controlling the switching device to switch between a first state and a second state, and The first valve and the second valve are controlled to be on or off respectively to change the flow direction of the refrigerant in the flow circuit, thereby enabling the air handling device to switch between multiple operating modes.

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