Heat exchanger cleaning system, cleaning method and air conditioning unit

Abstract

The invention discloses a heat exchanger cleaning system and method and an air conditioning unit, and the heat exchanger cleaning system comprises a heat exchanger which comprises two heat exchange sets arranged side by side; the fan assembly is used for driving airflow to pass through the heat exchanger; the spraying assembly comprises two spraying mechanisms located on the air inlet upstream of the heat exchanger, one spraying mechanism located on the same side of the heat exchange set is a default spraying mechanism of the heat exchange set, the other spraying mechanism located on the different side of the heat exchange set is a supplementary spraying mechanism of the heat exchange set, and each spraying mechanism is provided with a plurality of spraying heads with spraying openings facing the heat exchanger; and the moving mechanism is used for driving the spraying mechanism to move so as to adjust the spraying position of the nozzle on the heat exchanger. By designing the corresponding relation between the heat exchange set and the spraying assembly, the two spraying mechanisms are scheduled according to the cleaning requirement of the heat exchange set, and the purposes of larger cleaning range and higher cleaning efficiency are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning units, and in particular to a heat exchanger cleaning system, a cleaning method and an air conditioning unit. Background Art

[0002] During the operation of an air conditioning system, the problem of dust and scale accumulation on heat exchange components has always been the core pain point affecting the energy efficiency of the equipment. Traditional split air conditioners mostly adopt the method of manual disassembly and cleaning, which requires frequent start and stop of the equipment and has a low cleaning coverage rate, seriously affecting the continuous operation efficiency of the equipment. For large building scenarios, although the central air conditioning system reduces the maintenance frequency of terminal equipment through indirect heat exchange of chilled water circulation, the cooling capacity loss caused by its secondary heat exchange results in a certain decrease in the overall energy efficiency compared with the direct expansion air conditioning system. Due to the direct evaporation heat exchange technology of refrigerant adopted by the direct expansion unit, it has gradually become the mainstream solution in the modern air conditioning field with the advantages of high energy efficiency ratio and compact system structure. However, due to the highly integrated design of its evaporator and condenser (referred to as "two heat exchangers" for short), the fin spacing is generally small, resulting in difficulty for conventional physical cleaning tools to penetrate deep into the flow channels.

[0003] The current cleaning technology for the two heat exchangers of the direct expansion unit still remains in the traditional operation mode: the maintenance personnel need to completely stop the machine and remove the unit shell, and use a handheld spray gun to perform spot flushing on the fin surface. This method has three major technical defects: First, the high-pressure water flow cannot effectively penetrate the laminar flow barrier formed by the dense fins, and the proportion of cleaning blind spots exceeds 40%; Second, repeated disassembly and assembly lead to the attenuation of the sealing structure performance of the unit, and the average running noise value increases by 3 - 5 dB(A); Third, the manual cleaning cycle is more than 72 hours, seriously affecting the equipment availability in high-load scenarios.

[0004] Although there are improved solutions such as reciprocating spraying devices (CN200910106698.4) in the prior art, which clean by manufacturing a spraying device that sweeps left and right on the surface cooler and is controlled by an intelligent control unit, due to the limited coverage range of a single spraying device, this solution only has a good cleaning effect on small surface coolers and is not applicable to large air conditioning units.

[0005] Therefore, how to design a heat exchanger cleaning system, a cleaning method and an air conditioning unit with a large cleaning range and high efficiency is an urgent technical problem in the industry. Summary of the Invention

[0006] In order to solve the above-mentioned defects existing in the prior art, the present invention proposes a heat exchanger cleaning system, a cleaning method and an air conditioning unit, designs the corresponding relationship between the heat exchange group and the spraying assembly, and schedules two spraying mechanisms according to the cleaning requirements of the heat exchange group, so as to achieve the purpose of a larger cleaning range and higher cleaning efficiency.

[0007] The technical solution adopted by the present invention is to design a heat exchanger cleaning system, including:

[0008] A heat exchanger, which includes two heat exchange groups arranged side by side;

[0009] A fan assembly, which is used to drive air flow through the heat exchanger;

[0010] A spraying assembly, which includes two spraying mechanisms located upstream of the air inlet of the heat exchanger. One spraying mechanism located on the same side of the heat exchange group is the default spraying mechanism of the heat exchange group, and the other spraying mechanism located on different sides of the heat exchange group is the supplementary spraying mechanism of the heat exchange group. The spraying mechanism has several nozzles with the jet orifices facing the heat exchanger;

[0011] A moving mechanism, which is used to drive the spraying mechanism to move so as to adjust the spraying position of the nozzles on the heat exchanger.

[0012] Furthermore, the moving direction of the spraying mechanism is perpendicular to the air inlet direction of the heat exchanger, and the moving track of each spraying mechanism can cover the air inlet surface of the heat exchanger.

[0013] Furthermore, the heat exchange group includes a plurality of heat exchange units distributed in a matrix. A nozzle group capable of reciprocating movement is installed on the spraying mechanism. The spraying range of the nozzle group covers at least one heat exchange unit, and the moving direction of the nozzle group is at a 90° angle to the moving direction of the spraying mechanism.

[0014] Furthermore, a differential pressure sensor for detecting the differential pressure between the inlet and outlet air is installed on each heat exchange unit, and the working state of the spraying assembly is controlled by the differential pressure sensor.

[0015] Furthermore, the heat exchanger cleaning system further includes:

[0016] A mixing tray, which is used to supply water to the spraying assembly;

[0017] A water tank, which is used to store clean water. A clean water pipe is provided on the water tank and is connected to the mixing tray;

[0018] A cleaning agent tank, which is used to store cleaning agent. An adding pipe is provided on the cleaning agent tank and is connected to the mixing tray;

[0019] Wherein, the on-off states of the clean water pipe and the adding pipe are controllable.

[0020] Furthermore, the heat exchanger cleaning system further includes: a water collecting tray arranged below the heat exchanger. A water collecting pipe is provided on the water collecting tray and is connected to the mixing tray. A sewage discharge pipe is provided on the mixing tray. A photoelectric induction device for detecting the turbidity of the water flow and a sewage discharge valve controlled by the photoelectric induction device are installed on the sewage discharge pipe.

[0021] The present invention also proposes a cleaning method applied to the above heat exchanger cleaning system, including:

[0022] Detecting the differential pressure ΔP between the inlet and outlet air pressures of each heat exchange group;

[0023] Determine whether there is an air pressure difference ΔP between the inlet and outlet air pressures within any one of the set pressure difference intervals;

[0024] If so, determine the corresponding cleaning priority according to the set pressure difference interval where the air pressure difference ΔP between the inlet and outlet air pressures is located, and adjust the working state of the spray assembly according to the cleaning priority;

[0025] Among them, a correspondence relationship between the set pressure difference interval and the cleaning priority is established in advance, and the larger the set pressure difference interval, the higher the cleaning priority.

[0026] Furthermore, the heat exchange group includes a plurality of heat exchange units distributed in a matrix. Adjusting the working state of the spray assembly according to the cleaning priority includes:

[0027] Obtain the cleaning priorities of all heat exchange units in each heat exchange group, and find the highest cleaning priority of the heat exchange group as the effective cleaning priority;

[0028] Judge whether the effective cleaning priorities of two heat exchange groups are the same;

[0029] If so, both heat exchange groups are used as heat exchange groups to be cleaned, and the default spray mechanism of the heat exchange group to be cleaned is turned on for cleaning;

[0030] If not, the heat exchange group with the higher effective cleaning priority is used as the heat exchange group to be cleaned, the default spray mechanism of the heat exchange group to be cleaned is turned on for work, and the other supplementary spray mechanism moves to the heat exchange group to be cleaned to start cleaning.

[0031] Furthermore, a spray head group capable of reciprocating movement is installed on the spray mechanism, the spraying range of the spray head group covers one heat exchange unit, and each heat exchange unit in the heat exchange group is set with a unique corresponding position priority;

[0032] Adjusting the working state of the spray assembly according to the cleaning priority includes: before the spray mechanism starts cleaning, first obtain the cleaning priorities of all heat exchange units in the heat exchange group to be cleaned, and find the heat exchange unit with the highest cleaning priority as the heat exchange unit to be cleaned;

[0033] If there is only one heat exchange unit to be cleaned in the heat exchange group to be cleaned, the spray head group of the spray mechanism moves to the position of the heat exchange unit to be cleaned;

[0034] If there are more than one heat exchange units to be cleaned in the heat exchange group to be cleaned, the spray head group of the spray mechanism moves to the heat exchange unit to be cleaned with the highest position priority.

[0035] Furthermore, each heat exchange unit in the heat exchange group being set with a unique corresponding position priority includes:

[0036] The position priority is composed of a main priority and a secondary priority;

[0037] Among heat exchange units with different heights, the higher the position of the heat exchange unit, the higher the main priority;

[0038] Among heat exchange units with the same main priority, the closer the heat exchange unit is to the center of the heat exchanger, the higher the secondary priority.

[0039] Furthermore, adjusting the working state of the spray component according to the cleaning priority further includes:

[0040] Obtain the cleaning priorities of all heat exchange units in the heat exchanger and find the highest cleaning priority of the heat exchanger;

[0041] Obtain the corresponding target cleaning agent addition amount from the pre-established correspondence between the cleaning priority and the cleaning agent addition amount according to the highest cleaning priority;

[0042] Supply the cleaning agent to the spray component according to the target cleaning agent addition amount.

[0043] Furthermore, the cleaning method further includes:

[0044] After the spray component starts cleaning, time the actual cleaning time T;

[0045] When the actual cleaning time T reaches the set cleaning time t1, turn off the spray component, turn on the fan component until the set air movement time t2 is reached, supply clean water to the spray component, and turn on the spray component until the set flushing time t4 is reached.

[0046] The present invention also proposes an air-conditioning unit, including the above-mentioned heat exchanger cleaning system.

[0047] In some embodiments, the air-conditioning unit is a direct expansion unit.

[0048] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0049] 1. Each heat exchange group is configured with a default spray mechanism and a supplementary spray mechanism. When the heat exchange group has a cleaning requirement, it can be flushed by using the default spray mechanism or the default spray mechanism + supplementary spray mechanism, flexibly scheduling the two spray mechanisms to achieve a larger cleaning range and better cleaning efficiency;

[0050] 2. The heat exchange group includes a plurality of heat exchange units distributed in a matrix. The spray mechanism is equipped with a spray head group that can move reciprocally. The moving direction of the spray head group is 90° to the moving direction of the spray mechanism, which is equivalent to horizontal movement and lifting movement in the air inlet surface of the heat exchanger, enabling the spray head group to move to any area of the air inlet surface of the heat exchanger, with higher flexibility and energy and water savings;

[0051] 3. Adjust the working state of the spraying assembly according to the pressure difference between the inlet and outlet air pressures of the heat exchange group, so that the spraying mechanism can accurately and orderly clean each heat exchange unit, significantly improving the cleaning efficiency of the heat exchanger and minimizing the impact of spraying cleaning on the air inlet and outlet effects of the entire heat exchanger. The cleaning operation of the heat exchanger can be automatically carried out under the condition of the unit running. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The present invention will be described in detail below with reference to the embodiments and the drawings, where:

[0053] Figure 1 is a connection schematic diagram of the cleaning system of the present invention;

[0054] Figure 2 is a three-dimensional schematic diagram of the cleaning system of the present invention;

[0055] Figure 3 is a control flow schematic diagram of the spraying mechanism of the cleaning method of the present invention;

[0056] Figure 4 is a control flow schematic diagram of the spraying group of the cleaning method of the present invention;

[0057] Figure 5 is a control flow schematic diagram of the cleaning agent of the cleaning method of the present invention;

[0058] Figure 6 is an external shape schematic diagram of the air conditioner unit of the present invention;

[0059] Figure 7 is an internal schematic diagram of the air conditioner unit of the present invention;

[0060] BRIEF DESCRIPTION OF THE DRAWINGS: 1. Heat exchanger; 11. Heat exchange group; 2. Fan assembly; 3. Water pump; 4. Cleaning agent tank; 5. Adding valve; 6. Mixing plate; 7. Water collecting plate; 8. Spraying mechanism; 9. Water collecting valve; 10. Drain valve; 11. Photoelectric induction device; 12. Water tank; 13. Pressure difference sensor; 100. Air conditioner unit; 101. Main unit section; 102. Filter section; 103. Evaporation section; 104. Fan assembly section; 105. Sound insulation section. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0061] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below with reference to the drawings and the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0062] As Figure 1 , 2As shown in the figure, the heat exchanger cleaning system proposed by the present invention is particularly applicable to large air-conditioning units using finned heat exchangers, and the air-conditioning units include but are not limited to direct expansion units. Specifically, the heat exchanger cleaning system includes: a heat exchanger 1, a fan assembly 2, a spraying assembly, a moving mechanism, etc. The heat exchanger 1 includes two heat exchange groups 11 arranged side by side. When the fan assembly 2 starts to work, it drives air flow through the heat exchanger 1. The spraying assembly includes two spraying mechanisms 8 located upstream of the air inlet of the heat exchanger 1. The spraying mechanism 8 has a plurality of nozzles with the nozzle openings facing the heat exchanger 1. The moving mechanism drives the spraying mechanism 8 to move to adjust the spraying position of the nozzles on the heat exchanger 1.

[0063] A spraying mechanism 8 is provided on each side where the heat exchange group 11 is located. The spraying mechanism 8 located on the same side of the heat exchange group 11 is the default spraying mechanism for this heat exchange group, and the spraying mechanism 8 located on different sides of the heat exchange group 11 is the supplementary spraying mechanism for this heat exchange group. This design is to configure a default spraying mechanism and a supplementary spraying mechanism for each heat exchange group 11. When the heat exchange group 11 needs to be cleaned, it can be flushed by using the default spraying mechanism or the default spraying mechanism + supplementary spraying mechanism, flexibly dispatching the two spraying mechanisms 8 to achieve a larger cleaning range and better cleaning efficiency.

[0064] For the convenience of understanding, taking the example that the two heat exchange groups 11 are arranged side by side left and right and the air flow passes through the front and back sides of the heat exchanger 1, the two spraying mechanisms 8 are respectively erected and installed on both sides of the whole heat exchanger 1, and are respectively called the left spraying mechanism and the right spraying mechanism. For the left heat exchange group, the left spraying mechanism is the default spraying mechanism for the left heat exchange group, and the right spraying mechanism is the supplementary spraying mechanism for the left heat exchange group. When the left heat exchange group needs to be cleaned, usually the default spraying mechanism (left spraying mechanism) can be used for flushing, and in special cases, the default spraying mechanism + supplementary spraying mechanism (left spraying mechanism + right spraying mechanism, the right spraying mechanism moves to the left heat exchange group) can be used for flushing. For the right heat exchange group, the right spraying mechanism is the default spraying mechanism for the right heat exchange group, and the left spraying mechanism is the supplementary spraying mechanism for the right heat exchange group. When the right heat exchange group needs to be cleaned, usually the default spraying mechanism (right spraying mechanism) can be used for flushing, and in special cases, the default spraying mechanism + supplementary spraying mechanism (right spraying mechanism + left spraying mechanism, the left spraying mechanism moves to the right heat exchange group) can be used for flushing.

[0065] It should be noted that in actual application, if the two heat exchange groups are arranged side by side up and down, then one spraying mechanism is provided on the upper side of the whole heat exchanger 1 and one spraying mechanism is provided on the lower side. The corresponding relationship between the heat exchange group and the spraying mechanism can be referred to the above text and will not be elaborated here.

[0066] As Figure 2As shown, in the preferred embodiment of the present invention, the moving direction of the spraying mechanism 8 is perpendicular to the air inlet direction of the heat exchanger 1, and the moving trajectory of each spraying mechanism 8 can cover the air inlet surface of the heat exchanger 1. In practical applications, a first slide rail is installed outside the air inlet surface of the heat exchanger 1, and the spraying mechanism 8 is driven by a first motor to move back and forth on the first slide rail to accurately adjust the position of the spraying mechanism 8. After the adjustment is in place, it stops at that position to wash the corresponding heat exchange area. The stroke of the first slide rail exceeds the maximum distance between the two sides of the entire heat exchanger 1 to ensure that each spraying mechanism 8 can move to any heat exchange area of the heat exchanger 1 and avoid the occurrence of cleaning blind spots.

[0067] As Figure 1 shown, on this basis, the heat exchange group 11 includes a plurality of heat exchange units distributed in a matrix. A nozzle group capable of reciprocating movement is installed on the spraying mechanism 8, and the spraying range of the nozzle group covers at least one heat exchange unit, and the moving direction of the nozzle group is 90° to the moving direction of the spraying mechanism 8. In practical applications, a second slide rail is installed on the main body of the spraying mechanism 8, and the nozzle group is driven by a second motor to move back and forth on the second slide rail. When the spraying mechanism 8 moves along the first slide rail and the nozzle group moves along the second slide rail, the nozzle group can be moved to any heat exchange unit of the entire heat exchanger 1. After the adjustment is in place, it stops at that position to wash the corresponding heat exchange unit.

[0068] For easy understanding, taking the example that two heat exchange groups 11 are arranged side by side left and right and the air flow passes through the front and rear sides of the heat exchanger 1, two spraying mechanisms are respectively erected and installed on both sides of the overall heat exchanger, and are respectively called the left spraying mechanism and the right spraying mechanism. The moving direction of the spraying mechanism 8 is horizontal movement from left to right, and the moving direction of the nozzle group is up and down movement. It is equivalent to being able to move horizontally and vertically within the air inlet surface of the heat exchanger 1, so that the nozzle group can move to any area of the air inlet surface of the heat exchanger 1 to specifically wash the corresponding heat exchange unit, with higher flexibility and energy and water savings.

[0069] As Figure 1 shown, in the preferred embodiment of the present invention, a differential pressure sensor 13 for detecting the differential pressure ΔP between the inlet and outlet air is installed on each heat exchange unit. When the fins of the heat exchange unit are blocked by dust, the inlet air resistance increases, resulting in an increase in the differential pressure. Therefore, the detection data of the differential pressure sensor 13 can accurately reflect the degree of dirt of the current heat exchange unit. The working state of the spraying assembly is controlled by the differential pressure sensor 13 to achieve cleaning on demand and avoid waste of water and electricity caused by regular cleaning.

[0070] As Figure 1As shown, in some feasible embodiments of the present invention, the heat exchanger cleaning system further includes: a mixing tray 6, a water tank 12, and a cleaning agent tank 4. The water stored in the mixing tray 6 is pumped into the spraying assembly by a water pump 3 and then sprayed onto the heat exchanger 1 through a nozzle. The water tank 12 is used to store clean water. The water tank 12 is provided with a clean water pipe connected to the mixing tray 6 and a water replenishing port connected to an external water source. When the water volume in the water tank 12 is insufficient, the external water source adds water to the water tank 12 through the water replenishing port. When there is a water demand in the mixing tray 6, the water tank 12 transports clean water to the mixing tray 6 through the clean water pipe. The cleaning agent tank 4 is used to store the cleaning agent. The cleaning agent tank 4 is provided with an adding pipe connected to the mixing tray 6, and a certain amount of cleaning agent is added to the mixing tray 6 through the adding pipe to improve the cleaning effect. This design ensures sufficient water volume and appropriate cleaning agent concentration during the cleaning process of the spraying assembly through an intelligent water supply system and automatic proportioning of the cleaning agent, achieving efficient cleaning of the heat exchanger.

[0071] It should be understood that the on-off states of the clean water pipe and the adding pipe are controllable. Usually, valve components are installed on the pipeline to control the on-off states. Preferably, the adding pipe is installed with an adding valve 5 capable of adjusting the opening degree, and the opening degree of the adding valve is adjusted according to the dirt degree of the heat exchanger 1 to achieve precise control of the cleaning agent concentration.

[0072] On this basis, the heat exchanger cleaning system further includes a water collecting tray 7. The water collecting tray 7 is arranged below the heat exchanger 1 and is used to collect the sewage and impurities dropped from the heat exchanger 1. The water collecting tray 7 is provided with a water collecting pipe connected to the mixing tray 6. The mixing tray 6 is provided with a sewage discharge pipe. The sewage discharge pipe is installed with a photoelectric induction device 11 and a sewage discharge valve 10. The function of the photoelectric induction device 11 is to detect the turbidity degree of the water flow. After the sewage discharge valve 10 is opened, it is controlled by the photoelectric induction device 11. After the spraying assembly stops cleaning, the water collecting valve 9 of the water collecting pipe is opened, and the mixed liquid with impurities after cleaning enters the mixing tray 6. The bottom surface of the mixing tray 6 is an inclined surface, and the sewage discharge port is arranged at the lowest point of the bottom surface of the mixing tray 6. The sewage discharge valve 10 of the sewage discharge pipe is opened, and at the same time, the photoelectric induction device 11 starts to work. When the water quality is detected to be clear, the sewage discharge valve 10 is closed, and the remaining mixed liquid in the mixing tray 6 can be supplied to the spraying assembly again to clean the heat exchanger 1, forming a cleaning cycle. This design can not only effectively utilize the waste water, but also reduce the scale residue and pipeline corrosion, and extend the service life of the heat exchanger.

[0073] As Figure 3 shown, the present invention also proposes a cleaning method applied to the above heat exchanger cleaning system, including:

[0074] Detecting the differential pressure ΔP between the inlet and outlet air pressures of each heat exchange group;

[0075] Judging whether there is a differential pressure ΔP between the inlet and outlet air pressures within any one of the set differential pressure ranges;

[0076] If so, it indicates that the heat exchanger needs to be cleaned. Determine the corresponding cleaning priority according to the set pressure difference range where the inlet and outlet air pressure difference ΔP is located, and adjust the working state of the spraying component according to the cleaning priority;

[0077] If not, it indicates that the heat exchanger does not need to be cleaned. The two spraying mechanisms in the spraying component reset and move to both sides of the heat exchanger and remain closed;

[0078] Among them, a correspondence relationship between the set pressure difference range and the cleaning priority is established in advance. The larger the set pressure difference range, the higher the cleaning priority.

[0079] This design enables the spraying mechanism to accurately and orderly clean the heat exchange group through the technical closed-loop of pressure difference quantification and grading → priority dynamic sorting → spraying mechanism position matching. While ensuring the reliability of the equipment, it improves the cleaning efficiency of the heat exchanger, significantly reduces the consumption of water, electricity, chemicals and the frequency of manual intervention, and is a breakthrough solution for the intelligent operation and maintenance of air-conditioning units.

[0080] As Figure 3 shown, in the preferred embodiment of the present invention, the heat exchange group includes a plurality of heat exchange units distributed in a matrix. Adjusting the working state of the spraying component according to the cleaning priority includes:

[0081] Obtain the cleaning priorities of all heat exchange units in each heat exchange group, and find the highest cleaning priority of the heat exchange group as the effective cleaning priority;

[0082] Judge whether the effective cleaning priorities of the two heat exchange groups are the same;

[0083] If so, it indicates that the fouling degrees of the heat exchange units corresponding to the highest cleaning priorities in the two heat exchangers are the same. At this time, both heat exchange groups are used as the heat exchange groups to be cleaned, and the respective default spraying mechanisms are used to clean the two heat exchange groups synchronously;

[0084] If not, it indicates that the fouling degrees of the heat exchange units corresponding to the highest cleaning priorities in the two heat exchangers are different. The heat exchange unit with a higher effective cleaning priority has a more serious fouling degree. At this time, the heat exchange group with a higher effective cleaning priority is used as the heat exchange group to be cleaned. The default spraying mechanism of the heat exchange group to be cleaned is turned on, and the other supplementary spraying mechanism moves to the heat exchange group to be cleaned to start cleaning, and the two spraying mechanisms clean one heat exchange group at the same time.

[0085] This design can ensure that the two heat exchange groups are cleaned synchronously when their fouling degrees are basically the same, so that both heat exchange groups can quickly recover their performance. When the fouling degrees of the two heat exchange groups are different, the centralized spraying component is used to clean the heat exchange group with a worse state, so that it can quickly recover its performance, and the other heat exchange group with a better state can maintain its current performance and continue to operate to reduce the impact on the inlet and outlet air of the air-conditioning unit.

[0086] As Figure 4 shown, in a preferred embodiment of the present invention, a spray head group capable of reciprocating movement is installed on the spray mechanism, and the spraying range of the spray head group covers one heat exchange unit. Each heat exchange unit in the heat exchange group is set with a unique corresponding position priority;

[0087] Adjusting the working state of the spray assembly according to the cleaning priority includes: before the spray mechanism starts cleaning, first obtain the cleaning priorities of all heat exchange units in the heat exchange group to be cleaned, and find the heat exchange unit with the highest cleaning priority as the heat exchange unit to be cleaned;

[0088] If there is only one heat exchange unit to be cleaned in the heat exchange group to be cleaned, it means that the fouling degree of one heat exchange unit in the heat exchange group to be cleaned is the worst, and the spray head group of the spray mechanism moves to the heat exchange unit to be cleaned;

[0089] If there are more than one heat exchange units to be cleaned in the heat exchange group to be cleaned, it means that the fouling degrees of multiple heat exchange units in the heat exchange group to be cleaned are the worst, and the spray head group of the spray mechanism moves to the heat exchange unit to be cleaned with the highest position priority.

[0090] The advantage of this design is that the spray head group can perform targeted cleaning according to the fouling degree of each heat exchange unit, significantly improving the cleaning efficiency of the heat exchanger. Moreover, the heat exchange units outside the spraying range of the spray head group can still maintain their current performance and continue to operate, minimizing the impact of spray cleaning on the air inlet and outlet effects of the entire heat exchanger, and can automatically perform the cleaning operation of the heat exchanger under the condition of the unit running.

[0091] It should be noted that the position priority can be designed according to specific requirements. Taking the preferred solution of the present invention as an example, the position priority consists of a main priority and a secondary priority; among the heat exchange units with different heights, the higher the position of the heat exchange unit, the higher the main priority; among the heat exchange units with the same main priority, the closer the heat exchange unit is to the center of the heat exchanger, the higher the secondary priority. First determine the main priority of the heat exchange unit, and then determine the secondary priority of the heat exchange unit to ensure that when there are multiple heat exchange units to be cleaned in the heat exchange group to be cleaned, the heat exchange unit with the highest height and the closest distance to the center of the heat exchanger is preferentially cleaned.

[0092] The function of this design is that during the cleaning process of the heat exchange unit with a higher height, the water will wash down from the currently cleaned heat exchange unit and also has a cleaning effect on the heat exchange units below, making full use of water and cleaning agents, reducing the number of cleaning times, and being more energy-saving and power-saving. And the middle area of the heat exchanger is the core area of heat and cold exchange. Prioritizing the cleaning of the heat exchange units in the middle area is beneficial to helping the heat exchanger quickly restore its normal heat exchange performance and ensuring the operation effect of the air conditioner unit.

[0093] As Figure 5As shown, in some preferred embodiments of the present invention, adjusting the working state of the spraying assembly according to the cleaning priority further includes:

[0094] Obtain the cleaning priorities of all heat exchange units in the heat exchanger and find the highest cleaning priority of the heat exchanger;

[0095] Obtain the corresponding target cleaning agent addition amount from the pre-established correspondence between the cleaning priority and the cleaning agent addition amount according to the highest cleaning priority;

[0096] Supply the cleaning agent to the spraying assembly according to the target cleaning agent addition amount.

[0097] This design supplies the cleaning agent according to the cleaning requirements of the most severely soiled heat exchange unit to ensure that the heat exchange unit can be cleaned thoroughly. For example, assume that the heat exchange unit has only two set pressure difference intervals, namely [P1, P2] and (P1, +∞). [P1, P2] corresponds to mild soiling, the addition valve of the addition pipe is opened to 50% opening, and the opening time is maintained for the set addition time t0. (P1, +∞) corresponds to extremely severe soiling, the addition valve of the addition pipe is opened to 100% opening, and the opening time is maintained for the set addition time t0.

[0098] To ensure the cleaning effect of the spraying mechanism, after the cleaning agent is added and the water volume in the mixing tray is in place, turn on the water pump. The mixed liquid in the mixing tray enters the spraying mechanism through the hose, and the spraying mechanism sprays the mixed liquid through the spray nozzles to clean the corresponding heat exchange unit.

[0099] As Figure 5 shown, in the preferred embodiment, the cleaning method further includes:

[0100] After the spraying assembly starts cleaning, time the actual cleaning time T;

[0101] When the actual cleaning time T reaches the set cleaning time t1, turn off the spraying assembly, turn on the fan assembly until the set air movement time t2 is reached, and blow out the water stains and dirt on the heat exchanger through the air pressure. Then supply clean water to the spraying assembly, turn on the spraying assembly until the set flushing time t4 is reached, and use the clean water to flush the heat exchange unit to remove the residual mixed liquid on the surface of the heat exchange unit to prevent corrosion of the heat exchanger.

[0102] It should be understood that for the structure where the water collecting tray is connected to the mixing tray, after turning on the fan assembly until the set air movement time t2 is reached, first control the water collecting valve 9 to open, and the mixed liquid with impurities after cleaning enters the mixing tray 6. Open the sewage discharge valve to drain the sewage in the mixing tray until the water quality is clear, and then use the clean water in the mixing tray to flush the heat exchange unit.

[0103] To ensure that each heat exchange unit can be cleaned, the cleaning method further includes: after each heat exchange unit is cleaned, return to re-detect the pressure difference ΔP between the inlet and outlet air pressures of each heat exchange group.

[0104] As Figure 6 shown, the present invention also proposes an air-conditioning unit, including the above-mentioned heat exchanger cleaning system. Each heat exchange group of this cleaning system is configured with a default spraying mechanism and a supplementary spraying mechanism. When there is a cleaning requirement for the heat exchange group, it can be flushed by using the default spraying mechanism or the default spraying mechanism + supplementary spraying mechanism, flexibly scheduling the two spraying mechanisms to achieve a larger cleaning range and better cleaning efficiency.

[0105] In some embodiments, the air-conditioning unit is a direct expansion unit, which can be a magnetic levitation direct expansion unit.

[0106] As Figure 7 shown, the air-conditioning unit includes a main unit section 101, a filtering section 102, an evaporation section 103, a fan assembly section 104, and a silencing section 105. These functional sections are all prior arts. In this application example, the cleaning system is designed for the evaporation section 103, and the two spraying mechanisms are located on both sides of the evaporation section 103.

[0107] It should be noted that the terms used above are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. When the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. The execution order of actions, steps, etc. in the devices and methods shown in the specification and drawings can be implemented in any order as long as there is no specific order limitation and the output of the previous process is not used in the subsequent process. The similar sequential terms used for convenience of description do not mean that they must be implemented in such an order.

[0108] For technologies, methods, and devices known to those of ordinary skill in the relevant art, they may not be discussed in detail, but under appropriate circumstances, the said technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in the subsequent drawings.

[0109] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. Heat exchanger cleaning system, characterized in that: include: A heat exchanger comprising two heat exchange groups arranged side by side; a fan assembly for driving airflow through the heat exchanger; A spray assembly, comprising two spray mechanisms located upstream of the air inlet of the heat exchanger, wherein one spray mechanism located on the same side of the heat exchange group is a default spray mechanism of the heat exchange group, and the other spray mechanism located on a different side of the heat exchange group is a supplementary spray mechanism of the heat exchange group, and the spray mechanism has a plurality of nozzles with spray ports facing the heat exchanger; The moving mechanism is used to drive the spraying mechanism to move so as to adjust the spraying position of the spray head on the heat exchanger.

2. The heat exchanger cleaning system according to claim 1, characterized in that: The moving direction of the spray mechanism is perpendicular to the air inlet direction of the heat exchanger, and the moving track of each spray mechanism can cover the air inlet surface of the heat exchanger.

3. The heat exchanger cleaning system according to claim 2, characterized in that: The heat exchange group comprises a plurality of heat exchange units distributed in a matrix, and a nozzle group capable of reciprocating movement is installed on the spray mechanism, the spray range of the nozzle group covers at least one heat exchange unit, and the moving direction of the nozzle group is 90° to the moving direction of the spray mechanism.

4. The heat exchanger cleaning system according to claim 3, characterized in that: Each of the heat exchange units is equipped with a pressure difference sensor for detecting the pressure difference between the inlet and outlet air, and the working state of the spray assembly is controlled by the pressure difference sensor.

5. The heat exchanger cleaning system according to any one of claims 1 to 4, characterized in that: Also includes: a mixing plate for supplying water to the spray assembly; A water tank, which is used to store clean water, and the water tank is provided with a clean water pipe connected to the mixing disk; A detergent tank, which is used to store detergent, and the detergent tank is provided with a adding pipe connected to the mixing disk; Among them, the on-off status of the clean water pipe and the addition pipe is controllable.

6. The heat exchanger cleaning system according to claim 5, characterized in that: The heat exchanger cleaning system also includes: a water collecting tray arranged below the heat exchanger, the water collecting tray is provided with a water collecting pipe connected to the mixing tray, the mixing tray is provided with a sewage pipe, the sewage pipe is installed with a photoelectric sensing device for detecting the degree of turbidity of water flow and a sewage valve controlled by the photoelectric sensing device.

7. A cleaning method, the cleaning method being applied to the heat exchanger cleaning system according to any one of claims 1 to 6, characterized in that: The cleaning method comprises: Detecting the inlet and outlet air pressure difference ΔP of each heat exchange group; Determine whether the inlet and outlet air pressure difference value ΔP is within any of the set pressure difference intervals; If yes, determine the corresponding cleaning priority according to the set pressure difference interval where the inlet and outlet air pressure difference ΔP is located, and adjust the working state of the spray assembly according to the cleaning priority; A comparison relationship between the set pressure difference interval and the cleaning priority is pre-established, and the larger the set pressure difference interval is, the higher the cleaning priority is.

8. The cleaning method according to claim 7, characterized in that: The heat exchange group includes a plurality of heat exchange units distributed in a matrix, and adjusting the working state of the spray assembly according to the cleaning priority includes: Obtaining the cleaning priorities of all the heat exchange units in each of the heat exchange groups, and finding the highest cleaning priority of the heat exchange group as the effective cleaning priority; Determining whether the effective cleaning priorities of the two heat exchange groups are the same; If yes, both heat exchange groups are used as the heat exchange groups to be cleaned, and the default spray mechanism of the heat exchange groups to be cleaned is started for cleaning; If not, the heat exchange group with a higher effective cleaning priority is used as the heat exchange group to be cleaned, the default spray mechanism of the heat exchange group to be cleaned is started, and another supplementary spray mechanism is moved to the heat exchange group to be cleaned to start cleaning.

9. The cleaning method according to claim 8, characterized in that: The spray mechanism is provided with a nozzle group capable of reciprocating movement, the spray range of the nozzle group covers a heat exchange unit, and each heat exchange unit in the heat exchange group is set with a unique corresponding position priority; Adjusting the working state of the spray assembly according to the cleaning priority includes: before the spray mechanism starts cleaning, first obtaining the cleaning priorities of all heat exchange units in the heat exchange group to be cleaned, and finding the heat exchange unit with the highest cleaning priority as the heat exchange unit to be cleaned; If there is only one heat exchange unit to be cleaned in the heat exchange group to be cleaned, the nozzle group of the spray mechanism moves to the heat exchange unit to be cleaned; If there is more than one heat exchange unit to be cleaned in the heat exchange group to be cleaned, the nozzle group of the spray mechanism moves to the heat exchange unit to be cleaned with the highest position priority.

10. The cleaning method according to claim 9, characterized in that: Each heat exchange unit in the heat exchange group is set with a unique corresponding position priority including: The position priority consists of a primary priority and a secondary priority; Among heat exchange units with different heights, the higher the position of the heat exchange unit, the higher the main priority; Among heat exchange units with the same primary priority, the closer the heat exchange unit is to the center of the heat exchanger, the higher the secondary priority.

11. The cleaning method according to claim 8, characterized in that: Adjusting the working state of the spray assembly according to the cleaning priority also includes: Obtaining the cleaning priorities of all the heat exchange units in the heat exchanger, and finding the highest cleaning priority of the heat exchanger; According to the highest cleaning priority, obtaining a corresponding target detergent addition amount from a pre-established comparison relationship between the cleaning priority and the detergent addition amount; The cleaning agent is supplied to the spray assembly according to the target cleaning agent addition amount.

12. The cleaning system according to claim 11, characterized in that: The cleaning method further comprises: After the spray assembly is turned on for cleaning, the actual cleaning time T is timed; When the actual cleaning time T reaches the set cleaning time t1, the spray component is closed, the fan component is turned on until the set wind time t2 is reached, clean water is supplied to the spray component, and the spray component is turned on until the set flushing time t4 is reached.

13. An air conditioning unit, characterized in that: The air conditioning unit comprises the heat exchanger cleaning system according to any one of claims 1 to 6.

14. The air conditioning unit according to claim 13, characterized in that: The air conditioning unit is a direct expansion unit.

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