CN114198865A

CN114198865A - Air conditioning unit and control method thereof

Info

Publication number: CN114198865A
Application number: CN202111400811.7A
Authority: CN
Inventors: 王雷; 孙辉; 赵雷
Original assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Qingdao Haier Air Conditioning Electric Co Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Qingdao Haier Air Conditioning Electric Co Ltd; Haier Smart Home Co Ltd
Priority date: 2021-11-19
Filing date: 2021-11-19
Publication date: 2022-03-18
Anticipated expiration: 2041-11-19
Also published as: CN114198865B

Abstract

The invention relates to the technical field of air conditioners, and particularly provides an air conditioning unit and a control method thereof, aiming at solving the problem that the existing air conditioning unit cannot effectively solve the problem of icing on a water pan. For this purpose, the air conditioning unit comprises a water pan and a refrigerant circulation loop, wherein the refrigerant circulation loop comprises a main path and a plurality of parallel heat collection branches communicated with the main path, the plurality of heat collection branches are arranged on the water pan, a first electronic expansion valve is arranged on the main path, and a second electronic expansion valve is correspondingly arranged on each heat collection branch; the control method of the invention comprises the following steps: acquiring the temperatures of different areas on the water pan; and controlling the opening degree of the first electronic expansion valve and the opening and closing states of the plurality of second electronic expansion valves according to the temperatures of different areas on the water receiving tray. The control method of the invention adjusts the flow of the refrigerant flowing through the first electronic expansion valve and each second electronic expansion valve, so that the heat generated by the plurality of heat collecting branches can be adapted to the defrosting requirement of each area on the water pan.

Description

Air conditioning unit and control method thereof

Technical Field

The invention relates to the technical field of air conditioners, and particularly provides an air conditioning unit and a control method thereof.

Background

When the ambient temperature is low and the humidity is high, the heat exchanger of the air conditioning unit is easy to frost, the unit can defrost automatically for normal work without influencing the unit, defrosting water can be generated on the heat exchanger of the air conditioning unit under the defrosting condition of the unit, and because the ambient temperature is low, the water flow speed is low, the defrosting water flows to the drain hole on the water pan along the heat exchanger and is drained to the bottom of the water pan. When the defrosting water passes through the water receiving tray and other components, the defrosting water is changed into a solid state from a liquid state, and the defrosting water is easy to freeze to cause ice hanging. Meanwhile, when rain and snow fall on the water receiving tray through the fan, ice can be easily generated, the appearance attractiveness of the device is affected by ice, and the performance of the unit is reduced when the ice is frozen seriously.

Present improvement scheme is mainly through add heating device on the water collector, the temperature when making the defrosting rivers through the water collector is higher than the temperature that freezes, and then the problem of freezing on the water collector is solved, however, current air conditioning unit's water collector manufacturing cost is high, and can not effectively solve the problem of freezing on the water collector, can't carry out regional heating according to the regional difference of water collector, when freezing seriously, influence the function of air conditioning unit's normal work, and make the water collector undercut easily, and the service life is prolonged, user's user demand can't be satisfied. To sum up, current air conditioning unit's water collector manufacturing cost is high, and can not effectively solve the problem of freezing on the water collector, can't carry out regional heating according to the regional difference of water collector, when freezing seriously, leads to the unit performance to descend, can't satisfy user's user demand.

Accordingly, there is a need in the art for a new air conditioning unit and a method of controlling the same to address the above-mentioned problems.

Disclosure of Invention

The invention aims to solve the technical problem that the existing air conditioning unit cannot effectively solve the problem of icing on the water pan.

In a first aspect, the present invention provides a method for controlling an air conditioning unit, where the air conditioning unit includes a water pan and a refrigerant circulation loop, the refrigerant circulation loop includes a main path and a plurality of heat collecting branches connected in parallel and communicated with the main path, the plurality of heat collecting branches are correspondingly disposed in different areas on the water pan,

the plurality of heat collecting branches are arranged on the water pan, a first electronic expansion valve is arranged on the main path, and a second electronic expansion valve is correspondingly arranged on each heat collecting branch;

the control method comprises the following steps:

acquiring the temperature of different areas on the water pan;

and controlling the opening degree of the first electronic expansion valve and the opening and closing states of the plurality of second electronic expansion valves according to the temperatures of different areas on the water receiving tray.

In a preferred embodiment of the above control method, the step of controlling the opening degree of the first electronic expansion valve and the open/close states of the plurality of second electronic expansion valves according to the temperatures of the different areas on the water collector specifically includes:

respectively comparing the temperatures of different areas on the water pan with preset temperatures;

and controlling the opening degree of the first electronic expansion valve and the opening and closing states of the plurality of second electronic expansion valves according to the comparison result of the temperatures of different areas on the water receiving tray and the preset temperature.

In a preferred embodiment of the above control method, the step of controlling the opening degree of the first electronic expansion valve and the open/close states of the plurality of second electronic expansion valves according to a result of comparing the temperatures of the different areas on the water collector with the preset temperature includes:

and if the temperature of a certain area on the water pan is lower than the preset temperature, controlling a second electronic expansion valve of the heat collection branch correspondingly arranged with the area to open.

In a preferred embodiment of the above control method, the step of controlling the opening degree of the first electronic expansion valve and the open/close states of the plurality of second electronic expansion valves according to a comparison result between the temperatures of the different areas on the water collector and the preset temperature further includes:

and controlling the opening degree of the first electronic expansion valve according to the ratio of the number of the areas with the temperatures smaller than the preset temperature to the total number of the areas on the water pan.

In a preferred technical solution of the above control method, "controlling the opening degree of the first electronic expansion valve according to a ratio of the number of the areas on the water collector, where the temperature of each area is less than the preset temperature, to the total number of the areas" specifically includes:

the ratio of the number of the preset temperatures to the total number of the areas is smaller than the temperature of each area on the water pan, and the opening degree of the first electronic expansion valve is in direct proportion.

In a preferable technical scheme of the control method, the preset temperature is 0 ℃.

In a preferred technical scheme of the control method, the number of the heat collecting branches is six, and the step of comparing the temperatures of different areas on the water pan with the preset temperature respectively specifically comprises the following steps:

respectively comparing the temperatures of the six areas on the water pan with the preset temperature;

the step of controlling the opening degree of the first electronic expansion valve and the opening and closing states of the plurality of second electronic expansion valves according to the comparison result between the temperatures of the different areas on the water pan and the preset temperature specifically includes:

and controlling the opening degree of the first electronic expansion valve and the opening and closing states of the six second electronic expansion valves according to the comparison result of the temperatures of the six areas on the water receiving tray and the preset temperature.

In a preferred embodiment of the above control method, the step of controlling the opening degrees of the first electronic expansion valve and the open/close states of the six second electronic expansion valves according to the comparison result between the temperatures of the six areas on the water collector and the preset temperature includes:

and if the temperature of one of the six areas on the water pan is lower than the preset temperature, controlling a second electronic expansion valve of the heat collecting branch correspondingly arranged to the area to open.

In a preferred embodiment of the above control method, the step of controlling the opening degree of the first electronic expansion valve and the open/close states of the six second electronic expansion valves according to a comparison result between the temperatures of the six areas on the water collector and the preset temperature further includes:

if one or two of the temperatures of the six areas on the water pan are lower than the preset temperature, controlling the opening degree of the first electronic expansion valve to be a first preset opening degree;

if three temperatures of the six areas on the water pan are lower than the preset temperature, controlling the opening degree of the first electronic expansion valve to a second preset opening degree;

if four temperatures of six areas on the water pan are lower than the preset temperature, controlling the opening degree of the first electronic expansion valve to a third preset opening degree;

if five temperatures of six areas on the water pan are less than the preset temperature, controlling the opening degree of the first electronic expansion valve to a fourth preset opening degree;

if the temperatures of the six areas on the water pan are all smaller than the preset temperature, controlling the opening degree of the first electronic expansion valve to be a fifth preset opening degree;

the first preset opening degree is smaller than the second preset opening degree, the third preset opening degree is smaller than the fourth preset opening degree, and the fifth preset opening degree is smaller than the fourth preset opening degree.

In another aspect, the present invention further provides an air conditioning unit, which includes a controller, where the controller is capable of executing the control method in any one of the above technical solutions.

Under the condition of adopting the technical scheme, the air conditioning unit comprises a water pan and a refrigerant circulation loop, wherein the refrigerant circulation loop comprises a main path and a plurality of heat collection branches which are communicated with the main path and are arranged in parallel, the plurality of heat collection branches are arranged on the water pan, a first electronic expansion valve is arranged on the main path, and a second electronic expansion valve is correspondingly arranged on each heat collection branch. According to the invention, the water pan is heated through the arrangement of the plurality of heat collecting branches, so that the problem that the water pan is easy to freeze is effectively solved, and the heat generated by the plurality of heat collecting branches can be adapted to the defrosting requirement of each area on the water pan through the arrangement of the first electronic expansion valve and the second electronic expansion valve, so that the defrosting effect is ensured, and the energy consumption can be effectively saved. In addition, the control method can control the opening degree of the first electronic expansion valve and the opening and closing states of the plurality of second electronic expansion valves according to the temperatures of different areas on the water pan so as to correspondingly adjust the flow of the refrigerant flowing into each heat collecting branch and further control the heat generated by each heat collecting branch, so that the flowing condition of the refrigerant in each heat collecting branch can be adapted to the frost condition of each area on the water pan, and further, the frost prevention effect is ensured and the energy consumption can be effectively saved.

Drawings

Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

FIG. 1 is a system diagram of an air conditioning assembly of the present invention;

fig. 2 is a partial structural schematic view of an outdoor unit of an air conditioning unit according to the present invention;

FIG. 3 is an exploded view of a portion of the construction of the air conditioning assembly of the present invention;

FIG. 4 is a cross-sectional view of the mounting of the drip tray of the present invention;

FIG. 5 is an enlarged partial cross-sectional view of the mounting portion of the drip tray of the present invention;

FIG. 6 is a schematic view of the structure of the water pan of the present invention;

FIG. 7 is a schematic structural view of the water pan support frame of the present invention;

FIG. 8 is a schematic structural view of a water directing member of the present invention;

FIG. 9 is a flow chart of the main steps of the control method of the present invention;

FIG. 10 is a flowchart illustrating the detailed steps of a preferred embodiment of the control method of the present invention;

reference numerals:

11. a body; 12. a heat exchanger; 121. a first drain hole; 13. a water pan; 131. a support member; 1311. a second drain hole; 132. a water guide hole; 133. a connecting plate; 1331. connecting holes; 134. unfilled corners; 135. positioning holes; 14. a water guide member; 141. a horizontal plate; 142. a groove; 15. a water pan support frame; 151. mounting a plate; 1511. mounting holes; 152. a support beam; 153. a support plate; 16. a gasket; 17. fixing the support structure; 18. a first electronic expansion valve; 19. a liquid separating device; 20. a second electronic expansion valve; 21. a main road; 22. a heat collecting branch; 23. a four-way valve; 24. a compressor; 25. a gas-liquid separator; 26. a muffler; 27. an evaporator; 28. an oil tank; 29. an economizer; 30. a first check valve; 31. a second one-way valve; 32. a third electronically controlled valve; 33. a fourth electronically controlled valve.

Detailed Description

Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. And can be adjusted as needed by those skilled in the art to suit particular applications.

It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "middle", "rear", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In addition, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected" and "connected" should be interpreted broadly, e.g., as either a fixed connection or a removable connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Referring first to fig. 1 to 3, as shown in fig. 1 to 3, fig. 1 is a system diagram of an air conditioning unit according to the present invention, fig. 2 is a schematic view of a partial structure of an outdoor unit of the air conditioning unit according to the present invention, and fig. 3 is an exploded view of the partial structure of the air conditioning unit according to the present invention. As shown in fig. 1 to 3, the air conditioning unit of the present invention includes a water pan 13 and a refrigerant circulation loop, where the refrigerant circulation loop includes a main path 21 and a plurality of heat collecting branches 22 connected in parallel and communicated with the main path 21, the plurality of heat collecting branches 22 are disposed on the water pan 13, the main path 21 is provided with a first electronic expansion valve 18, and each heat collecting branch 22 is correspondingly provided with a second electronic expansion valve 20.

Specifically, as shown in fig. 1, in the preferred embodiment, the number of the heat collecting branches 22 and the second electronic expansion valve 20 is six, and the six heat collecting branches 22 are respectively disposed in six different areas of the water pan 13 to heat different areas on the water pan 13, the six areas are respectively provided with a temperature sensor (not shown in the figure), a liquid separating device 19 is disposed between the first electronic expansion valve 18 and the second electronic expansion valve 20, the liquid separating device 19 includes six liquid separating ports, the six liquid separating ports are respectively communicated with one heat collecting branch 22, the temperature sensor can transmit a temperature signal of the area of the water pan 13 where the temperature sensor is located to a controller of the air conditioning unit, the controller can control the opening degree of the first electronic expansion valve 18 according to information of the temperature sensor and can also control the on-off state and the opening degree of the second electronic expansion valve 20, to effect heating of different areas on the drip tray 13.

It should be noted that, the present invention does not limit the number of the heat collecting branches 22 and the second electronic expansion valves 20 correspondingly arranged therein, and the arrangement manner of the heat collecting branches 22 on the water collector 13, for example, the heat collecting branches 22 may be embedded on the surface of the water collector 13, may also be arranged inside the water collector 13, and may also be provided with a plate on the water collector 13, the heat collecting branches 22 are arranged in the plate, and a technician may set the setting by himself according to the actual situation.

In addition, it should be noted that, although the frosting condition of the water tray 13 is monitored by the temperature sensor in the preferred embodiment, this is not restrictive; for example, a technician may also directly control the first electronic expansion valve 18 and the second electronic expansion valve 20 manually to heat the water collector 13, and for example, a camera may be arranged above the water collector 13 to monitor the frosting condition of the water collector 13, and the technician may set the frosting condition according to the actual condition.

Continuing to refer to fig. 1, the refrigerant circulation loop is further provided with a four-way valve 23, a compressor 24, a gas-liquid separator 25, an evaporator 27 and an economizer 29, the gas-liquid separator 25 is arranged at an air inlet of the compressor 24, a muffler 26 is arranged between the economizer 29 and the compressor 24, the refrigerant circulation loop is further provided with a first one-way valve 30 and a second one-way valve 31, the first one-way valve 30 and the second one-way valve 31 are arranged in parallel, an oil tank 28 is arranged between the second one-way valve 31 and the evaporator 27, the refrigerant circulation loop is further provided with two third electronic control valves 32 arranged in parallel, and a fourth electronic control valve 33 is arranged between the third electronic control valve 32 and the economizer 29.

Specifically, as a preferred arrangement, refer to fig. 4 and 5, fig. 4 is a sectional view of a mounting place of the water pan of the present invention, and fig. 5 is a partially enlarged sectional view of the mounting place of the water pan of the present invention. As shown in fig. 4 and 5, as a preferred arrangement, the middle of the water pan 13 is protruded to form a structure with a high middle and a low periphery, so as to better realize drainage, thereby effectively strengthening the defrosting effect. The air conditioning unit further comprises a support member 131, and the heat exchanger 12 of the air conditioning unit is connected with the water pan 13 through the support member 131. It should be noted that the present invention does not limit the specific structure of the supporting member 131, the supporting member 131 may be a supporting plate, or may be a boss disposed on the water tray 13, and the technician may set the supporting member according to the actual situation.

Further, in the preferred embodiment, the heat exchanger 12 is provided with a first drain hole 121, the support member 131 is provided with a second drain hole 1311, and the first drain hole 121 and the second drain hole 1311 are disposed in one-to-one correspondence. Specifically, the number of the first drain holes 121 and the number of the second drain holes 1311 are equal, and the axes of the first drain holes 121 and the axes of the second drain holes 1311 are aligned, so that the water in the heat exchanger 12 can be drained to the water collector 13 through the second drain holes 1311 after being drained through the first drain holes 121.

In addition, in the preferred embodiment, the water receiving tray 13 is provided with a plurality of water guide holes 132, and the water guide holes 132 are correspondingly disposed below the second water discharge holes 1311, so that water generated in the defrosting process can be discharged in time, and the defrosting effect can be further effectively ensured. The water guide member 14 is disposed below the plurality of water guide holes 132, and the water guide member 14 is disposed in an inclined manner, so as to further improve the drainage efficiency. The water on the water receiving tray 13 is discharged into the water guide member 14 through the water guide hole 132, and the water guide member 14 further discharges the water.

Specifically, as a preferable arrangement, the support members 131 are arranged at the left, right, and rear three side positions of the upper surface of the water tray 13 with the direction shown in fig. 4 as a reference direction, the number of the support members 131 on each side is equal, a certain gap exists between every two adjacent support members 131, and the width of each gap is equal. In addition, the air conditioning unit further includes a gasket 16, the gasket 16 being disposed between the support member 131 and the heat exchanger 12; the gasket 16 can reduce the damage of the gravity of the heat exchanger 12 to the support member 131 and the water pan 13, so as to protect the water pan. It should be noted that the specific structure and the number of the water guide holes 132, the spacers 16, and the support members 131 are not limited in the present invention, and the skilled person can set the structure and the number according to the actual situation.

Furthermore, it is further preferable that the gasket 16 is provided with water outlet holes (not shown), the first water outlet holes 121 and the water outlet holes are arranged in a one-to-one correspondence, and the axes of the water outlet holes are aligned with the axes of the first water outlet holes 121 and the second water outlet holes 1311 so as not to hinder the water discharging operation of the heat exchanger 12.

Preferably, the air conditioning unit further comprises a water pan support frame 15, the water pan support frame 15 is connected with the water pan 13, and the shape of the water pan support frame 15 is matched with that of the water pan 13. Specifically, referring to fig. 7, fig. 7 is a schematic structural view of the water pan support frame of the present invention. As shown in fig. 7, the water receiving tray support frame 15 includes two mounting plates 151, two supporting beams 152 and a supporting plate 153, the two supporting beams 152 are the same in structure and are arranged in parallel, the supporting plate 153 is arranged at the top of the two supporting beams 152, the supporting plate 153 can be matched with the protruding part of the water receiving tray 13 to support the protruding part of the water receiving tray 13, so as to prevent the water receiving tray 13 from sinking downwards, the service life of the water receiving tray 13 is prolonged, the mounting plates 151 are arranged at the two ends of the supporting beams 152, the mounting plates 151 are provided with mounting holes 1511, and the mounting holes 1511 are used for fixing the water receiving tray support frame 15.

In addition, it should be noted that the invention does not limit the specific structure and the arrangement position of the water pan support frame 15, and the water pan support frame 15 may also be arranged above the water pan 13, for example, the water pan support frame 15 includes four inclined support rods, the four support rods are connected with each other two by two through connecting rods, one end of each support rod is connected with the protruding part of the water pan 13, the other end of each support rod is connected with the heat exchanger 12, the protruding part of the water pan 13 is prevented from sinking downwards through the upward pulling force of the support rod, and the service life of the water pan 13 is further prolonged.

With continuing reference to fig. 4 and 5, the air conditioning unit further includes a fixing support structure 17, the fixing support structure 17 can support the edge of the water pan 13, and a through hole (not shown) is further disposed on the fixing support structure 17, the through hole is matched with the mounting hole 1511 and is fixed by a fastening member to fix the water pan support frame 15. It should be noted that the present invention does not limit the specific structure of the fixed support structure 17, as long as the structure can support the water collector 13 and the fixed water collector support frame 15, and the technician can set the structure according to the actual situation.

Referring next to fig. 6, fig. 6 is a schematic structural view of the water pan of the present invention. As shown in fig. 6, a connecting plate 133 is further disposed on the water pan 13, a connecting hole 1331 is disposed on the connecting plate 133, a matching fixing hole is correspondingly disposed on the air conditioning unit, the fixing hole 1331 and the fixing hole are fixed by a fastening member, the stability of the water pan 13 is further enhanced, the water pan 13 is quadrilateral, unfilled corners 134 are further disposed at four corner positions of the water pan 13, the unfilled corners 134 are disposed so that the shape of the water pan 13 can meet the requirements of the body 11 of the air conditioning unit, the installation and the disassembly of the water pan 13 are not hindered, a positioning hole 135 is further disposed on the water pan 13, the water pan 13 can be positioned by the positioning hole 135 during installation, and then the fastening member passes through the positioning hole 135 and passes through a threaded hole matching with the positioning hole 135 to further fix the water pan 13. In addition, it should be noted that, a technician may select a fixing manner according to the installation condition of the drip tray 13, for example, after the installation and the fixation are performed through the positioning hole 135, the connecting plate 133 is not fixed; after the fixing through the connecting plate 133, the positioning hole 135 is not fixed, and the technician can set the positioning hole according to the actual situation.

Referring next to fig. 8, fig. 8 is a schematic structural view of a water guide member of the present invention. As shown in fig. 8, the water guide member 14 includes a horizontal plate 141, a groove 142 is formed in the horizontal plate 141 and is recessed downward, and the groove 142 is inclined to accelerate the discharge of water on the water guide member 14.

Based on the above structure, after the temperature sensors in different areas on the water pan 13 detect the temperatures in different areas of the water pan 13, the temperature sensors transmit signals to the controller of the air conditioning unit, the controller controls the opening degree of the first electronic expansion valve 18 and controls the on-off state and the opening degree of the second electronic expansion valve 20 accordingly, the refrigerant medium is introduced into the heat collecting branch 22, and the different areas on the water pan 13 are heated by the heat collecting branch 22, so that the ice layer on the water pan 13 is melted, and since the water pan 13 is high in the middle and low in the periphery, the melted water is discharged into the water guide member 14 through the water guide hole 132 and then discharged through the water guide member 14, and the melted water on the heat exchanger 12 is discharged into the water pan 13 through the first water discharge hole 121 and the second water discharge hole 1311, further discharged into the water guide member 14 and discharged through the water guide member 14.

Further, the air conditioning unit of the present invention further includes a controller, and the controller is capable of controlling an operation state of the air conditioning unit, for example, controlling an opening degree of the first electronic expansion valve, controlling an opening/closing state of the second electronic expansion valve, and the like. It can be understood by those skilled in the art that the present invention does not limit the specific structure and model of the controller, and the controller may be the original controller of the air conditioning unit, or may be a controller separately configured to execute the control method of the present invention, and the structure and model of the controller may be set by a technician according to actual use requirements.

The air conditioning unit can solve the problem of icing on the water pan 13 based on the structural improvement, and the air conditioning unit is combined with the following control method to timely and accurately regulate and control the first electronic expansion valve 18 and the second electronic expansion valve 20, so that the anti-frosting effect and the energy consumption saving effect are considered to the greatest extent.

Referring next to fig. 9, fig. 9 is a flow chart of the main steps of the control method of the present invention. As shown in fig. 9, based on the air conditioning unit described in the above embodiment, the control method of the present invention mainly includes the following steps:

s1: acquiring the temperatures of different areas on the water pan;

s2: and controlling the opening degree of the first electronic expansion valve and the opening and closing states of the plurality of second electronic expansion valves according to the temperatures of different areas on the water receiving tray.

Further, in step S1, in a preferred embodiment, the controller can obtain the temperatures of different areas on the water tray 13 in real time; in another preferred embodiment, the controller can acquire the temperatures of different areas on the water pan 13 at intervals, and a technician can set the temperatures according to actual conditions.

In addition, it should be noted that the present invention does not limit the manner of acquiring the temperatures of different areas on the water collector 13, for example, the temperature may be monitored by a temperature sensor provided in the air conditioning unit itself, or may be monitored by a manner of manually monitoring and inputting the temperatures, and a technician may set the temperatures according to actual situations.

Further, in step S2, the controller may control the opening size of the first electronic expansion valve 18 and the open/close state of the plurality of second electronic expansion valves 20, that is, control all of the plurality of second electronic expansion valves 20 to be opened, or control part of the plurality of second electronic expansion valves 20 to be opened, or control none of the plurality of second electronic expansion valves 20 to be opened, according to the temperatures of the different regions on the water tray 13. It should be noted that, the controller may control the opening degree of the first electronic expansion valve 18 according to a ratio of the number of the areas with the temperatures lower than the preset temperature to the total number of the areas on the water collector 13, and the ratio of the number of the areas with the temperatures lower than the preset temperature to the total number of the areas on the water collector 13 to the total number of the areas is in direct proportion to the opening degree of the first electronic expansion valve 18. The controller may calculate an average temperature of the water tray 13 according to the temperatures of the respective areas on the water tray 13, and control the opening degree of the first electronic expansion valve 18 according to a numerical range of the average temperature, and a technician may set the opening degree according to actual conditions, so long as the controller controls the opening degree of the first electronic expansion valve 18 according to the temperatures of the different areas on the water tray 13 and controls the open/close states of the plurality of second electronic expansion valves 20, which falls within the protection scope of the present invention.

Specifically, as a preferable control method, the specific control method corresponding to step S2 is: if the temperature of a certain area on the water pan is lower than the preset temperature, controlling a second electronic expansion valve of the heat collection branch correspondingly arranged with the area to open; and controlling the opening degree of the first electronic expansion valve according to the ratio of the number of the areas with the temperatures smaller than the preset temperature to the total number of the areas on the water pan, wherein the ratio of the number of the areas with the temperatures smaller than the preset temperature to the total number of the areas on the water pan is in direct proportion to the opening degree of the first electronic expansion valve.

Referring next to fig. 10, fig. 10 is a flowchart illustrating specific steps of a preferred embodiment of the control method of the present invention. As shown in fig. 10, based on the air conditioning unit described in the foregoing embodiment, a preferred embodiment of the control method of the present invention specifically includes the following steps:

s101: acquiring the temperatures of six areas of the water pan;

s102: respectively comparing the temperatures of the six areas on the water pan with preset temperatures;

s103: controlling the opening degree of the first electronic expansion valve and the opening and closing state of the second electronic expansion valve according to the comparison result of the temperatures of the six areas on the water receiving disc and the preset temperature;

s104: if the temperature of a certain area on the water pan is lower than the preset temperature, controlling a second electronic expansion valve of a heat collection branch correspondingly arranged in the area to open;

s105: controlling the opening degree of the first electronic expansion valve according to the ratio of the number of the areas with the temperature lower than the preset temperature to the total number of the areas on the water pan;

s106: if one or two of the temperatures of the six areas on the water pan are lower than the preset temperature, controlling the opening degree of the first electronic expansion valve to be a first preset opening degree;

s107: if three temperatures of the six areas on the water pan are less than the preset temperature, controlling the opening degree of the first electronic expansion valve to a second preset opening degree;

s108: if four temperatures of six areas on the water pan are lower than the preset temperature, controlling the opening degree of the first electronic expansion valve to a third preset opening degree;

s109: if five temperatures of six areas on the water pan are less than the preset temperature, controlling the opening degree of the first electronic expansion valve to a fourth preset opening degree;

s110: and if the temperatures of all six areas on the water pan are less than the preset temperature, controlling the opening degree of the first electronic expansion valve to a fifth preset opening degree.

Further, in step S101, in an optional preferred embodiment, the controller can obtain the temperatures of six areas on the water pan 13 in real time; in another preferred embodiment, the controller can acquire the temperatures of six areas on the water receiving tray 13 at intervals, and a technician can set the temperatures according to actual conditions. It will be appreciated that the division of the drip tray 13 into six zones is merely a preferred arrangement, and that the six zones are further preferably circumferentially distributed so as to achieve a better zone division effect, and the number of such zone divisions can be set by the skilled person according to the actual situation.

Further, in step S102, the controller may compare the temperatures of the six areas on the water pan 13 with a preset temperature, where the preset temperature is preferably 0 ℃, and this is only a preferred setting manner, and a technician may also set a specific value of the preset temperature according to actual use requirements. If the temperature of one or more of the six areas of the water-receiving tray 13 is lower than the preset temperature, the risk of icing in the area or icing already exists.

Further, in step S103, the controller may control the opening size of the first electronic expansion valve 18 and the open/close states of the plurality of second electronic expansion valves 20, that is, control all of the six second electronic expansion valves 20 to be opened, or control part of the six second electronic expansion valves 20 to be opened, or control none of the six second electronic expansion valves 20 to be opened, according to the temperatures of the six areas on the water pan 13. It should be noted that, the controller may control the opening degree of the first electronic expansion valve 18 according to a ratio of the number of the six areas on the water collector 13, where the temperatures of the six areas are less than a preset temperature, to the total number of the six areas, and the ratio of the number of the six areas on the water collector 13 to the total number of the areas, where the temperatures of the six areas are less than the preset temperature, is in direct proportion to the opening degree of the first electronic expansion valve 18. The controller may calculate an average temperature of the drip tray 13 according to the temperatures of six areas on the drip tray 13, and control the opening degree of the first electronic expansion valve 18 according to a numerical range of the average temperature, so that a technician may set the average temperature according to actual conditions.

Further, in step S104, if the temperature of a certain region on the water pan 13 is lower than the preset temperature, the second electronic expansion valve 20 of the heat collecting branch corresponding to the region is controlled to be opened, and after the second electronic expansion valve 20 is opened, the refrigerant medium is introduced into the heat collecting branch 22 corresponding to the region, so as to heat and melt the region or heat and prevent icing.

Further, as a preferable configuration, the first preset opening degree in step S106 is 1/5 of the maximum opening degree, the second preset opening degree in step S107 is 2/5 of the maximum opening degree, the third preset opening degree in step S108 is 3/5 of the maximum opening degree, the fourth preset opening degree in step S109 is 4/5 of the maximum opening degree, and the fifth preset opening degree in step S110 is the maximum opening degree of the first electronic expansion valve 18. It should be noted that the above setting mode is only a preferred setting mode for better realizing accurate control, and the present invention does not limit specific values of the first preset opening degree, the second preset opening degree, the third preset opening degree, the fourth preset opening degree and the fifth preset opening degree, as long as the requirement that the first preset opening degree is smaller than the second preset opening degree and smaller than the third preset opening degree and smaller than the fourth preset opening degree and smaller than the fifth preset opening degree can be met, and a technician can set the setting mode according to actual situations.

Based on the arrangement, the first electronic expansion valve 18 can effectively control the flow of the refrigerant flowing through the heat collecting branch 22, and the energy consumption can be more effectively saved under the condition that the water pan 13 can be prevented from freezing.

In addition, as a preferable control manner, when the second electronic expansion valve 20 is opened, it may be set to acquire the temperature of the area of the water pan 13 where the second electronic expansion valve 20 is located again within a period of time, and if the acquired temperature is still less than the preset temperature, the second electronic expansion valve 20 is still opened, and the opening degree of the first electronic expansion valve 18 is increased to accelerate ice melting; if the reacquired temperature is greater than the preset temperature, the second electronic expansion valve 20 is closed and the opening degree of the first electronic expansion valve 18 is adjusted accordingly. It is also possible that, in the case where the second electronic expansion valve 20 is opened, the second electronic expansion valve 20 is directly closed after a set period of time and the opening degree of the first electronic expansion valve 18 is adjusted accordingly. When the plurality of second electronic expansion valves 20 are opened, the first electronic expansion valve 18 and the second electronic expansion valve 20 may be directly closed after heating the water tray 13 for a certain time.

In another aspect, the present invention also provides an air conditioning unit, and a controller of the air conditioning unit is capable of executing the control method described in any of the above preferred embodiments.

So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.

Claims

1. A control method of an air conditioning unit is characterized in that the air conditioning unit comprises a water pan and a refrigerant circulation loop, the refrigerant circulation loop comprises a main path and a plurality of heat collection branches which are communicated with the main path and are arranged in parallel, the plurality of heat collection branches are correspondingly arranged in different areas on the water pan,

the control method comprises the following steps:

acquiring the temperature of different areas on the water pan;

2. The method according to claim 1, wherein the step of controlling the opening degree of the first electronic expansion valve and the open/close states of the plurality of second electronic expansion valves according to the temperatures of the different areas on the water tray specifically comprises:

3. The control method according to claim 2, wherein the step of controlling the opening degree of the first electronic expansion valve and the open/close states of the plurality of second electronic expansion valves according to the comparison result between the temperatures of the different areas on the water tray and the preset temperature comprises:

4. The control method according to claim 2, wherein the step of controlling the opening degree of the first electronic expansion valve and the open/close states of the plurality of second electronic expansion valves according to the comparison result between the temperatures of the different areas on the water tray and the preset temperature further comprises:

5. The control method according to claim 4, wherein the step of controlling the opening degree of the first electronic expansion valve according to the ratio of the number of the areas with the temperatures lower than the preset temperature to the total number of the areas on the water pan specifically comprises:

6. The control method according to any one of claims 2 to 5, characterized in that the preset temperature is 0 ℃.

7. The control method according to any one of claims 2 to 5, wherein the number of the heat collecting branches is six, and the step of comparing the temperatures of different areas on the water pan with the preset temperature respectively specifically comprises:

8. The control method according to claim 7, wherein the step of controlling the opening degree of the first electronic expansion valve and the open/close states of the six second electronic expansion valves according to the comparison result between the temperatures of the six areas on the water tray and the preset temperature comprises:

9. The control method according to claim 7, wherein the step of controlling the opening degree of the first electronic expansion valve and the open/close states of the six second electronic expansion valves according to the comparison result between the temperatures of the six areas on the water collector and the preset temperature further comprises:

10. Air conditioning assembly, characterized in that it comprises a controller able to carry out the control method of any one of claims 1 to 9.