CN115615031A - Air treatment equipment and control method thereof - Google Patents

Abstract

The invention relates to air treatment equipment and a control method thereof, relates to the technical field of air conditioning, and is used for realizing the functions of double-evaporation-temperature refrigeration, reheating temperature control dehumidification, heating and the like. The air treatment equipment comprises a switching device, a first valve, a second heat exchanger and a first heat exchanger; the switching device, the first valve, the second heat exchanger and the first heat exchanger are connected to form a flow loop of the refrigerant; the switching device is switchable between a first state and a second state, the first valve and the second valve being respectively switchable on and off to enable the air treatment apparatus to be switched between a plurality of operating modes. Compared with the prior art, the invention has the advantages that under the condition of reducing connecting pipes and four-way valve electronic devices, the functions of double-evaporation-temperature refrigeration, reheating temperature control dehumidification, heating and the like are realized, the requirements on air temperature control and humidity control are met, the cost is low, the installation time is consumed, and the required refrigerant filling amount is less.

Description

Air treatment equipment and control method thereof

Technical Field

The present invention relates to the field of air conditioning technology, and in particular, to an air processing apparatus and a control method thereof.

Background

Traditional fresh air conditioning equipment adopts the vapor compression cooling dehumidification usually, uses an evaporating temperature to handle fresh air sensible heat and latent heat load simultaneously, is difficult to compromise humidity and temperature control simultaneously. The air conditioner is often limited by the requirement of the air outlet dew point temperature, the evaporation temperature of the unit is usually lower, and the air outlet temperature is also very low, so that the comfort is poor.

Part of the fresh air conditioning equipment adopts a plurality of three-connecting-pipe systems: (1) the scheme without a four-way valve system can only operate a reheating and dehumidifying mode, the design cost is high, and the system universality is poor; (2) the scheme of a single four-way valve system can only operate reheating dehumidification and heating modes, the design cost is relatively high, the refrigerating capacity is limited, and the system universality is general; (3) the double four-way valve system scheme can realize double evaporation temperature refrigeration, reheating dehumidification and heating modes, but the system is relatively complex, the number of system control devices is large, the product reliability is reduced to some extent, and the design cost is high.

Disclosure of Invention

The invention provides an air treatment device which is used for realizing the functions of double-evaporation-temperature refrigeration, reheating temperature control dehumidification, heating and the like, meets the requirements on air temperature control and humidity control, and solves the defect that the existing fresh air conditioning equipment is complex in structure.

The present invention provides an air treatment device comprising:

the heat exchanger comprises a switching device, a first valve, a second heat exchanger and a first heat exchanger; the switching device is provided with at least four interfaces, and a first interface and a second interface of the switching device are respectively connected with a first side of the first valve and a first side of the second valve;

the second side of the first valve and the second side of the second valve are both connected with the first side of the second heat exchanger;

the first side of the first valve is also connected with the first side of the first heat exchanger, the second side of the second heat exchanger is also respectively connected with the second side of the first heat exchanger and the first side of the second valve, and the second side of the first heat exchanger is also connected with the first side of the second valve to form a flow loop of the refrigerant;

the switching device is switchable between a first state and a second state, the first valve and the second valve being respectively switchable on and off to enable the air treatment apparatus to be switched between a plurality of operating modes.

In one embodiment, in the first state, the first port of the switching device communicates with the third port and the second port of the switching device communicates with the fourth port, the first valve is open and the second valve is closed.

In one embodiment, in the second state, the first port of the switching device communicates with the fourth port and the second port of the switching device communicates with the third port, the first valve is open and the second valve is closed.

In one embodiment, the heat exchanger further comprises a compressor and a third heat exchanger, wherein an output interface and an input interface of the compressor are respectively connected with a third interface and a fourth interface of the switching device; and the first side of the third heat exchanger is connected with the second interface of the switching device, and the second side of the third heat exchanger is respectively connected with the first side of the second valve, the second side of the first heat exchanger and the second side of the second heat exchanger.

In one embodiment, the air conditioner further comprises a first air supply device, and the third heat exchanger is arranged on a circulation path of an air flow formed by the first air supply device. The air supply device can be a fan or a fan.

In one embodiment, the heat exchanger further comprises a first temperature sensor for measuring the temperature of the environment in which the third heat exchanger is located, and a second temperature sensor for measuring the temperature of the third heat exchanger.

In one embodiment, the air conditioner further comprises a second air supply device, and the second heat exchanger and the first heat exchanger are arranged on a circulation path of an air flow formed by the second air supply device. The air supply device can be a fan or a fan.

In one embodiment, the air conditioner further comprises a third temperature sensor and a fourth temperature sensor, wherein the third temperature sensor is used for measuring the temperature of the first heat exchanger, and the fourth temperature sensor is used for measuring the temperature of the air flow after flowing through the second heat exchanger.

In one embodiment, a fifth temperature sensor is further included for measuring a discharge temperature of the compressor.

In one embodiment, further comprising a first throttling means, a second throttling means and a third throttling means; the first side and the second side of the first throttling device are respectively connected with the second interface of the switching device and the first side of the second valve; a first side of the second throttling device is connected with a second interface of the switching device, and a second side of the second throttling device is respectively connected with a second side of the first heat exchanger and a second side of the third throttling device; the first side of the third throttling device is connected with the second side of the second heat exchanger, and the second side of the third throttling device is also connected with the second side of the first heat exchanger.

In one embodiment, the first, second and third throttling devices are electronic expansion valves.

In one embodiment, further comprising a third valve and a fourth valve; a first side of the third valve is connected with a first interface of a switching device, and a second side of the third valve is respectively connected with a first side of the first valve and a first side of the first heat exchanger; and a first side of the fourth valve is connected with a second interface of the switching device, and a second side of the fourth valve is respectively connected with the first side of the second valve, the second side of the second heat exchanger and the second side of the first heat exchanger.

In one embodiment, the first and second valves are one-way valves, and the outflow ends of the first and second valves are each connected to the first side of the second heat exchanger.

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

The invention also provides a control method of the air treatment equipment, which comprises the following steps:

controlling the switching means to switch between a first state and a second state, an

The first valve and the second valve are respectively controlled to be switched on or switched off to change the flow direction of the refrigerant in the flow circuit, so that the air treatment equipment can be switched among a plurality of operation modes.

Compared with the prior art, the invention has the advantages that two valve systems are adopted, the indoor unit is connected with the outdoor unit through two pipes, under the condition of reducing connecting pipes and four-way valve electronic devices, the functions of double-evaporation-temperature refrigeration, reheating temperature control dehumidification, heating and the like are realized, the requirements on air temperature control and humidity control are met, the cost is low, the installation time is long, and the required refrigerant filling amount is less. The temperature and humidity can be accurately adjusted in a refrigeration and dehumidification mode; the temperature can be accurately controlled in the heating mode, and the temperature and humidity can be controlled after the humidification module is externally connected; the refrigerant flow direction switching is realized by reversing the one-way valve without adding a connecting pipe and a four-way valve and utilizing the principle of switching the refrigerant on and off by the pressure difference of the one-way valve.

Drawings

The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings.

FIG. 1 is a schematic structural view of an air treatment apparatus in an embodiment of the present invention;

FIG. 2 is a schematic diagram of the system of the air treatment device of the present invention in a high-load cooling mode and a temperature and humidity adjusting mode;

FIG. 3 is a schematic view of the system configuration of the air treatment unit of the present invention in a low load cooling mode;

FIG. 4 is a schematic diagram of the system configuration of the air treatment unit of the present invention in a low temperature heating mode;

fig. 5 is a schematic diagram of a system configuration of an air treatment apparatus in a room temperature heating mode according to the present invention.

Reference numerals are as follows:

1. a compressor; 2. a third heat exchanger; 3. a first fan; 4. a first temperature sensor; 5. a second temperature sensor; 6. a second fan; 7. a first heat exchanger; 8. a third temperature sensor; 9. a second throttling device; 10. a third throttling device; 11. a second heat exchanger; 12. a fourth temperature sensor; 13. a first check valve; 14. a second check valve; 15. a first throttling device; 16. a third valve; 17. a four-way valve; 18. a fifth temperature sensor; 19. a fourth valve; 20. a first interface; 21. a second interface; 22. a third interface; 23. a fourth interface; 24. a first intersection port; 25. a second intersection port; 26. a third intersection port; 27. a fourth intersection port; 28. a first connecting pipe; 29. a second connecting conduit.

Detailed Description

The invention will be further explained with reference to the drawings.

As shown in fig. 1, the present invention provides an air treatment apparatus including an outdoor unit and an indoor unit connected to form a refrigerant flow circuit by a first connection pipe 28 and a second connection pipe 29. A third valve 16 and a fourth valve 19 are respectively arranged on the first connecting line 28 and the second connecting line 29, and the third valve 16 and the fourth valve 19 are respectively used for controlling the on-off of the first connecting line 28 and the second connecting line 29.

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

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

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 communicates with the third port 22 and the second port 21 of the switching device communicates with the fourth port 23; in the second state, the first port 20 and the fourth port 23 of the four-way valve 17 communicate and the second port 21 and the third port 22 communicate.

The first fan 3 is operable to form a flow path for an air flow, and the third heat exchanger 2 is disposed in the flow path for the air flow. The outdoor unit further comprises a first temperature sensor 4, a second temperature sensor 5 and a fifth temperature sensor 18. The first temperature sensor 4 is used for measuring the temperature of the environment where the third heat exchanger 2 is located, i.e. the outdoor temperature, and the second temperature sensor 5 is used for measuring the temperature of the third heat exchanger 2. The fifth temperature sensor 18 is used to measure the discharge temperature of the compressor 1.

The indoor unit includes a first check valve 13, a second check 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.

The first connecting conduit 28 is connected in turn to the first non return valve 13, the second heat exchanger 11, the first throttle device 15, the second throttle device 9 and the second connecting conduit 29. A first junction port 24 is provided in the first connecting pipe 28, a second junction port 25 is provided in the connecting pipe between the second throttling device 9 and the third throttling device 10, and the first junction port 24 connects the first heat exchanger 7 and the second junction port 25 in this order via a pipe. A third junction port 26 is provided on the second connecting pipe 29, a fourth junction port 27 is provided on the connecting pipe between the first check valve 13 and the second heat exchanger 11, and the third junction port 26 connects the first throttling device 15, the second check valve 14, and the fourth junction port 27 in sequence through pipes. The inflow ends of the first and second non-return valves 13, 14 are connected to the first and second connections 20, 21 of the through valve by means of first and second connecting lines 28, 29, respectively; the outflow ends of the first check valve 13 and the second check valve 14 are connected to the same side of the second heat exchanger 11 so that the refrigerant can flow to the second heat exchanger 11 through the check valves. Preferably, the first throttling device 15, the second throttling device 9 and the third throttling device 10 are all electronic expansion valves.

The second fan 6 is operable to define an airflow path along which the first heat exchanger 7 and the second heat exchanger 11 are arranged in series along the airflow path. The indoor unit further comprises a third temperature sensor 8 for measuring the temperature of the first heat exchanger 7 and a fourth temperature sensor 12 for measuring the temperature of the airflow after passing through the second heat exchanger 11.

The four-way valve 17 can be switched between a first state and a second state, the first one-way valve 13 and the second one-way valve 14 being respectively switchable on and off to enable the air treatment apparatus to be switched between a plurality of operating modes. In the first state, the first port 20 and the third port 22 of the four-way valve 17 are communicated, the second port 21 and the fourth port 23 are communicated, the first check valve 13 is communicated, and the second check valve 14 is disconnected; in the second state, the first port 20 and the fourth port 23 of the four-way valve 17 are communicated, the second port 21 and the third port 22 are communicated, the first check valve 13 is turned off, and the second check valve 14 is turned on.

The air treatment device has five modes of operation.

(1) High load refrigeration mode

As shown in FIG. 2, 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.

After being sucked from an input interface of the compressor 1, the low-pressure low-temperature refrigerant is compressed into high-temperature high-pressure vapor refrigerant by the compressor 1 and then is discharged from an output interface, and the vapor refrigerant flows through the third heat exchanger 2 through the four-way valve 17 to be condensed and exchanged heat and is cooled into high-pressure medium-temperature refrigerant, and the refrigerant is divided into two paths for exchanging heat in the indoor unit. One path of the refrigerant flows to the second throttling device 9, the refrigerant is changed into a low-temperature low-pressure vapor-liquid two-phase state, and then the refrigerant flows to the first heat exchanger 7 to cool fresh air for the first time; the other path of the refrigerant flows to the first throttling device 15, the refrigerant is also changed into a low-temperature low-pressure vapor-liquid two-phase state, and then the refrigerant flows to the second heat exchanger 11 through the second one-way valve 14 to cool the fresh air for the second time; the first check valve 13 is not filled with refrigerant, and the refrigerant after absorbing heat flows to the first heat exchanger 7 through the third throttling device 10 to continue absorbing heat (here, the third throttling device 10 is opened to the maximum, and the refrigerant is not throttled and cooled). The refrigerant absorbs heat in the first heat exchanger 7 and then becomes a low-pressure low-temperature refrigerant, and returns to the input interface of the compressor 1 through the four-way valve 17, thereby completing a refrigeration cycle.

(2) Low load cooling mode

As shown in fig. 3, the four-way valve 17 is in the second state, the first port 20 of the four-way valve 17 is communicated with the fourth port 23, and the second port 21 is communicated with the third port 22.

After being sucked from the input interface of the compressor 1, the low-pressure low-temperature refrigerant is compressed into high-temperature high-pressure vapor refrigerant by the compressor 1 and then is discharged from the output interface, and the vapor refrigerant flows through the third heat exchanger 2 through the four-way valve 17 to be condensed and heat-exchanged and is cooled into 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 check valve 14, the second heat exchanger 11 to the third throttling device 10, so that the fresh air cannot be cooled at the second inner heat exchanger by the refrigerant. The other path of the refrigerant flows to the second throttling device 9, the refrigerant is changed into a low-temperature low-pressure vapor-liquid two-phase state, and then the refrigerant flows to the first heat exchanger 7 to cool the fresh air for the first time. The refrigerant absorbs heat in the first heat exchanger 7 and then becomes a low-pressure low-temperature refrigerant, and the low-pressure low-temperature refrigerant returns to an input interface of the compressor 1 through the four-way valve 17 to complete a refrigeration cycle.

(3) Temperature and humidity control mode

Referring to fig. 2, the refrigerant flow direction in this mode is identical to that in the high-load cooling mode, but different control methods are applied to the first throttling device 15, the second throttling device 9, and the third throttling device 10.

At the moment, the second throttling device 9 is a main throttling part, the temperature of the refrigerant is lower than that of the first throttling device 15, and the low-temperature and low-pressure refrigerant cools and dehumidifies fresh air at the first heat exchanger 7.

Meanwhile, the first throttling device 15 is opened to the maximum, throttling and cooling treatment is not carried out on the refrigerant, the high-temperature and high-pressure refrigerant flows to the second heat exchanger 11 through the second one-way valve 14, the low-temperature and low-humidity fresh air is heated and reheated for the first time, the refrigerant becomes a high-pressure normal-temperature state after absorbing heat, and is throttled and cooled through the third throttling device 10, the state of the refrigerant is consistent with that of the refrigerant at the second throttling device 9, the fresh air is cooled and dehumidified through the first heat exchanger 7 after being gathered, and then returns to an input interface of the compressor 1 through the four-way valve 17, and a temperature and humidity adjusting cycle is completed.

In this mode, the opening degree of the third throttling device 10 can be continuously adjusted and changed according to the target air outlet temperature value, when the heating capacity of the second heat exchanger 11 is insufficient, the first fan 3 can synchronously reduce the rotating speed of the fan, and the heat exchange capacity of the second heat exchanger 11 is improved by reducing the heat exchange capacity of the third heat exchanger 2.

(4) Low temperature heating mode

As shown in FIG. 4, the four-way valve 17 is in a first state, with the first port 20 of the four-way valve 17 in communication with the third port 22 and the second port 21 in communication with the fourth port 23.

After being sucked from the input interface of the compressor 1, the low-pressure low-temperature refrigerant is compressed into high-temperature high-pressure vapor refrigerant by the compressor 1, is discharged from the output interface, is reversed by the four-way valve 17, and flows to the first one-way valve 13 and the first heat exchanger 7 in two ways. One path of refrigerant carries out first heat release on low-temperature fresh air at the first heat exchanger 7, changes into a low-temperature high-pressure state and flows to a second throttling device 9; and the other path of refrigerant passes through the first check valve 13 and releases heat to the fresh air for the second time in the second heat exchanger 11, so that the outlet air temperature is increased. The refrigerant then flows through the third expansion device 10 (where the third expansion device 10 is opened to the maximum without throttling the refrigerant) to the second expansion device 9, and the second expansion device 9 becomes a main expansion part, and the refrigerant is changed to a low temperature and low pressure state and flows to the outdoor unit. The refrigerant absorbs heat at the third heat exchanger 2, changes into a low-temperature and low-pressure state, and returns to the input interface of the compressor 1 through the four-way valve 17, so that a heating cycle is completed.

(5) Normal temperature heating mode

As shown in FIG. 5, the four-way valve 17 is in a first state, with the first port 20 of the four-way valve 17 in communication with the third port 22 and the second port 21 in communication with the fourth port 23.

After being sucked from the input interface of the compressor 1, the low-pressure low-temperature refrigerant is compressed into high-temperature high-pressure vapor refrigerant by the compressor 1, is discharged from the output interface, is reversed by the four-way valve 17, and flows to the first one-way valve 13 and the first heat exchanger 7 in two ways. In this mode, the third throttling device 10 is completely closed, and the refrigerant cannot flow from the first check valve 13, the second heat exchanger 11 to the third throttling device 10, so that the fresh air cannot be heated in the second refrigerant heat exchanger 11. The other path of refrigerant carries out primary heat release on low-temperature fresh air at the first heat exchanger 7, changes into a low-temperature high-pressure state and flows to a second throttling device 9; the refrigerant heats the fresh air only once at the first heat exchanger 7.

While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims (15)

1. An air treatment device, characterized in that,

the system comprises a switching device, a first valve, a second heat exchanger and a first heat exchanger; the switching device is provided with at least four interfaces, and a first interface and a second interface of the switching device are respectively connected with a first side of the first valve and a first side of the second valve;

the second side of the first valve and the second side of the second valve are both connected with the first side of the second heat exchanger;

the first side of the first valve is also connected with the first side of the first heat exchanger, the second side of the second heat exchanger is also respectively connected with the second side of the first heat exchanger and the first side of the second valve, and the second side of the first heat exchanger is also connected with the first side of the second valve to form a flow loop of the refrigerant;

the switching device is switchable between a first state and a second state, the first valve and the second valve being respectively switchable on and off to enable the air treatment apparatus to be switched between a plurality of operating modes.

2. An air treatment device according to claim 1, characterized in that in the first state the first port of the switching device communicates with the third port and the second port of the switching device communicates with the fourth port, the first valve is conductive and the second valve is non-conductive.

3. An air treatment device according to claim 1, characterized in that in the second state the first port of the switching device is in communication with the fourth port and the second port of the switching device is in communication with the third port, the first valve being open and the second valve being open.

4. The air treatment equipment according to claim 1, further comprising a compressor and a third heat exchanger, wherein the output interface and the input interface of the compressor are respectively connected with the third interface and the fourth interface of the switching device; and the first side of the third heat exchanger is connected with the second interface of the switching device, and the second side of the third heat exchanger is respectively connected with the first side of the second valve, the second side of the first heat exchanger and the second side of the second heat exchanger.

5. The air processing apparatus according to claim 4, further comprising a first air blowing device, wherein the third heat exchanger is provided in a flow path of an air flow formed by the first air blowing device.

6. The air treatment apparatus of claim 5, further comprising a first temperature sensor for measuring the temperature of the environment in which the third heat exchanger is located and a second temperature sensor for measuring the temperature of the third heat exchanger.

7. The air processing apparatus according to claim 1, further comprising a second air-blowing device, wherein the second heat exchanger and the first heat exchanger are provided on a flow path of an air flow formed by the second air-blowing device.

8. The air treatment apparatus of claim 7, further comprising a third temperature sensor for measuring a temperature of the first heat exchanger and a fourth temperature sensor for measuring a temperature of the airflow after passing through the second heat exchanger.

9. The air treatment apparatus of claim 4, further comprising a fifth temperature sensor for measuring a discharge temperature of the compressor.

10. The air treatment apparatus of claim 1, further comprising 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 with the second interface of the switching device and the first side of the second valve; a first side of the second throttling device is connected with a second interface of the switching device, and a second side of the second throttling device is respectively connected with a second side of the first heat exchanger and a second side of the third throttling device; the first side of the third throttling device is connected with the second side of the second heat exchanger, and the second side of the third throttling device is also connected with the second side of the first heat exchanger.

11. The air treatment apparatus of claim 10, wherein the first, second, and third throttling devices are electronic expansion valves.

12. The air treatment apparatus of claim 1, further comprising a third valve and a fourth valve; a first side of the third valve is connected with a first interface of a switching device, and a second side of the third valve is respectively connected with a first side of the first valve and a first side of the first heat exchanger; and a first side of the fourth valve is connected with a second interface of the switching device, and a second side of the fourth valve is respectively connected with the first side of the second valve, the second side of the second heat exchanger and the second side of the first heat exchanger.

13. An air treatment device according to any of claims 1-12, wherein the first and second valves are one-way valves, the outflow ends of the first and second valves each being connected to the first side of the second heat exchanger.

14. An air treatment device according to any of claims 1-12, characterized in that the switching means is a four-way valve.

15. A control method of an air treatment apparatus according to any one of claims 1-14, characterized by comprising the steps of:

controlling the switching means to switch between a first state and a second state, an

The first valve and the second valve are respectively controlled to be switched on or switched off to change the flow direction of the refrigerant in the flow circuit, so that the air treatment equipment can be switched among a plurality of operation modes.

Images