Air source fin self-cleaning control method

Abstract

The invention relates to the technical field of air source heat pump unit self-cleaning, in particular to an air source fin self-cleaning control method. The problem of filth blockage accumulated due to the fact that an air source heat pump unit is exposed to the outdoor environment for a long time is solved. According to the method, data are measured through an environment temperature and humidity sensor and a fin temperature sensor, a control system controls a compressor, a condensation fan and a four-way valve according to the data, and automatic cleaning is achieved. The method comprises the specific steps that a condensation fan is turned off, the environment dew point temperature is measured, the fin temperature is reduced to be below the dew point to form condensation, the temperature is further reduced to be below 0 DEG C for frosting, fin cleaning temperature is preset, the fin cleaning temperature is finished, the defrosting process is started through reversing of a four-way valve, and after defrosting is finished, the condensation fan rotates reversely to operate to remove residues. And finally, stopping to complete self-cleaning. According to the method, dirt on the fins can be effectively removed, the heat exchange efficiency is improved, the energy consumption is reduced, the manual maintenance cost is reduced, and the service life of equipment is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of self-cleaning of air source heat pump units, and in particular to a self-cleaning control method for air source fins. Background Art

[0002] In accordance with the requirements of the dual reduction policy of reducing pollutant emissions and lowering energy consumption, the coal-to-electricity industry has developed rapidly. Air source heat pump units have become the preferred product to replace coal-fired boiler heating due to their high efficiency, environmental protection and energy saving.

[0003] With the widespread application of air source heat pump units, the problem of long-term exposure to the outdoor environment has gradually emerged. Especially in the spring season, impurities in the air, such as fallen leaves and catkins, are very easy to accumulate on the air source fin condenser, forming dirty blockage. Traditional air source heat pump units generally lack automatic cleaning functions, which means that they must rely on professionals for regular or irregular manual cleaning. This reliance not only increases additional maintenance costs, but also due to the uncontrollability of the cleaning cycle, it is likely to lead to untimely cleaning, thus affecting the operating efficiency and reliability of the unit. Dirty and blocked condenser fins not only reduce heat exchange efficiency and increase energy consumption, but may also become a hidden danger to the safe operation of the unit.

[0004] The working principle of the air source heat pump unit is to absorb low-grade heat energy in the air and convert it into high-grade heat energy for heating or hot water supply through the heat pump cycle. However, when the surface of the condenser fins increases, its heat exchange performance will drop significantly. In the case of dirt and blockage, the heat exchange efficiency of the traditional air source heat pump unit drops significantly, causing the unit to consume more electricity to achieve the same heating effect, thereby increasing energy consumption and accelerating the wear and corrosion of mechanical parts.

[0005] Traditional air source heat pump units lack automatic cleaning functions. After long-term operation, dirt and blockages on the condenser fins will gradually accumulate, causing the heat exchange efficiency to continue to decline. This not only increases the operating load and energy consumption of the unit, but may also accelerate the wear and corrosion of mechanical parts, thereby shortening the service life of the equipment. At the same time, dirt and blockage may also cause frequent failures of the unit, affecting the normal use and satisfaction of users.

[0006] In summary, traditional air source heat pump units have prominent problems in automatic cleaning function, energy utilization efficiency, maintenance cost and equipment life. In view of these problems, it is particularly urgent and important to develop an air source fin self-cleaning control method. Summary of the invention

[0007] In order to solve the problems existing in the background technology, the present invention provides an air source fin self-cleaning control method, which is provided with an ambient temperature and humidity sensor, a fin temperature sensor, a compressor, a condensing fan, a condenser, an evaporator, a four-way valve and a control system, wherein:

[0008] The ambient temperature and humidity sensor and the fin temperature sensor are connected to the control system through signal lines, and the measured data are transmitted to the control system for processing; the control system controls the operating status of the compressor, condensing fan and four-way valve through the control signal line according to the received data; the compressor is connected to the condenser and evaporator of the unit through the refrigerant pipeline to form a refrigeration or heating cycle; the condensing fan provides external air flow for the condenser under normal circumstances; the four-way valve realizes the reversal of the refrigerant flow direction under the control of the control system;

[0009] Proceed as follows:

[0010] S1. Turn off the condensing fan to reduce the impact of external air flow on the fin temperature and facilitate the subsequent condensation and frosting process;

[0011] S2. Use the ambient temperature and humidity sensor to measure the temperature and humidity of the current environment, and calculate the dew point temperature T1 of the air based on these data. The dew point temperature T1 is the temperature at which water vapor in the air begins to condense into dew. When the fin temperature drops below the dew point temperature T1, dew begins to condense on the fin surface, forming condensation.

[0012] S3, assuming the fin temperature is T2, the compressor continues to run, and the fin temperature is further reduced; when the fin temperature T2 drops below 0°C, frost begins to form on the fin surface;

[0013] S4, preset the clean wing temperature T3 and end the clean wing temperature T4, keep the fin temperature T2 continuously decreasing until the preset clean wing temperature T3 is reached, at which time enough frost is formed on the fin surface;

[0014] S5. After reaching the set clean fin temperature T3, the current time is recorded, and the preset stabilization time is t0. After t0 time, frost is stably formed on the fin surface;

[0015] S6, by controlling the reversing direction of the four-way valve, the flow direction of the refrigerant is changed, thereby starting the defrosting process; at this time, the frost on the condenser begins to melt and takes away the dirt attached to the fins;

[0016] S7, as the defrosting process proceeds, the fin temperature gradually rises; when the fin temperature rises to the set end-cleaning fin temperature T4, the defrosting process is stopped;

[0017] S8: After defrosting, in order to more thoroughly remove the residue on the fins, the condensing fan is reversed for a time t1, and the residue is blown off the fin surface by the reverse airflow;

[0018] S9. After the reverse operation is completed, the condensing fan stops working, the unit stops, and the self-cleaning process ends.

[0019] In a preferred embodiment, the clean wing temperature T3 is preset to -5°C.

[0020] In a preferred embodiment, the wing temperature T4 at the end of cleaning is preset to 25°C.

[0021] In a preferred solution, the preset stabilization time t0 is preset to 3 minutes.

[0022] In a preferred embodiment, the reverse operation time t1 of the condensing fan is 120 seconds.

[0023] The beneficial effects achieved by the present invention are:

[0024] First, the present invention uses ambient temperature and humidity sensors to measure the difference between dew point temperature and fin temperature, thereby realizing the automatic cleaning function of the air source heat pump unit. By precisely controlling the compressor operation and the reversing of the four-way valve, the fins can automatically frost and defrost at different temperatures, effectively removing dirt. A new self-cleaning control logic is adopted, which has never been used in the design of traditional air source heat pump units. It can automatically identify and respond to environmental changes, and intelligently adjust the operation of the unit to ensure the best self-cleaning effect in different seasons and environments.

[0025] Second, the present invention uses the frosting and defrosting process caused by natural temperature differences to scientifically utilize natural physical phenomena such as dew point and frosting, optimizes energy efficiency, reduces the problem of reduced heat exchange efficiency caused by dirt and blockage, and thus reduces energy consumption and improves overall energy efficiency.

[0026] Third, the present invention provides an economical, efficient and easy-to-implement solution that reduces the long-term maintenance and labor costs of the unit. It reduces the need for manual maintenance, simplifies the maintenance process, and improves the reliability and safety of the unit. Regular and timely automatic cleaning reduces wear and corrosion of mechanical parts, helping to extend the service life of the equipment. It can keep the condenser fins clean in real time, reducing mechanical failures and downtime caused by dirt and blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. In addition, the forms of the various structures recorded in the following embodiments are merely illustrative, and the present invention is not limited to the various structures recorded in the following embodiments. All other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0029] Reference Figure 1 , an air source fin self-cleaning control method composition structure includes:

[0030] The ambient temperature and humidity sensor measures the temperature and humidity of the current environment and provides data support for the control system. The ambient temperature and humidity sensor is connected to the control system through a signal line to transmit temperature and humidity data.

[0031] The fin temperature sensor measures the real-time temperature of the fins and is used to determine whether the fins have reached condensation, frost, etc. The fin temperature sensor is connected to the control system through a signal line to transmit the fin temperature data.

[0032] The control system receives data transmitted by the ambient temperature and humidity sensor and the fin temperature sensor, and controls the operating status of other components according to the preset logic. The control system receives sensor data through the signal line and controls the compressor, condensing fan, four-way valve and other components through the control signal line.

[0033] The compressor realizes the cooling or heating function through the refrigerant circulation. It is connected with the condenser and evaporator through the refrigerant pipeline to form a cooling or heating cycle; the compressor also receives the control signal of the control system.

[0034] The condensing fan provides external air flow to the condenser under normal circumstances to enhance the condensing effect; during the self-cleaning process, it can be turned off or reversed according to the control command. The condensing fan is connected to the control system through the control signal line and receives the control signal of the control system.

[0035] In the refrigeration cycle, the condenser cools the high-temperature and high-pressure refrigerant gas discharged from the compressor into liquid, releasing heat. The condenser is connected to the compressor and evaporator through the refrigerant pipeline and is an important part of the refrigerant cycle.

[0036] In the refrigeration cycle, the evaporator absorbs heat from the air and evaporates the refrigerant into gas. The evaporator is connected to the compressor and condenser through the refrigerant pipeline to form a complete refrigeration cycle.

[0037] The four-way valve, under the control of the control system, realizes the reversal of the refrigerant flow direction, thereby changing the cooling or heating working mode of the unit. The four-way valve is connected to the control system through a control signal line and receives the control signal for reversing operation.

[0038] The ambient temperature and humidity sensor and the fin temperature sensor transmit the measured temperature and humidity data to the control system through the signal line. Based on the received data, the control system sends control signals to the compressor, condensing fan and four-way valve through the control signal line to adjust their operating status. The compressor is connected to the condenser and evaporator through the refrigerant pipeline to form a cooling or heating cycle. Under normal circumstances, the condensing fan provides external air flow to the condenser, and is shut down or reversed according to the control command during the self-cleaning process. Under the control of the control system, the four-way valve changes the flow direction of the refrigerant to realize the cooling or heating function of the unit, and starts the defrosting process during the self-cleaning process.

[0039] The specific steps of an air source fin self-cleaning control method are as follows:

[0040] Turn off the condensing fan: First turn off the condensing fan to reduce the impact of external air flow on the fin temperature, which facilitates the subsequent condensation and frosting process.

[0041] Measure and calculate the dew point temperature: Use the ambient temperature and humidity sensor to measure the temperature and humidity of the current environment, and calculate the dew point temperature T1 of the air based on these data. The dew point temperature T1 is the temperature at which water vapor in the air begins to condense into dew. The value of the dew point temperature T1 is usually within the range (-10-10℃).

[0042] Condensation process: When the fin temperature drops below the dew point temperature T1, dew begins to condense on the fin surface, forming condensation.

[0043] Frosting process: Keep the compressor running to further reduce the fin temperature. When the fin temperature T2 drops below 0℃, frost begins to form on the fin surface.

[0044] Reaching the preset clean wing temperature: preset a clean wing temperature T3, and continue to reduce the fin temperature until it reaches the preset clean wing temperature T3. At this time, sufficient frost will form on the fin surface.

[0045] Frost is stably formed: After the clean fin temperature T3 is reached, the current time is recorded and a stabilization time t0 is preset. After t0, frost will be stably formed on the fin surface. t0 is preferably preset to 3 minutes.

[0046] Start the defrost process: By controlling the reversing direction of the four-way valve, the flow direction of the refrigerant is changed, thereby starting the defrost process. At this time, the frost on the condenser begins to melt and takes away the dirt attached to the fins.

[0047] End of defrosting process: As the defrosting process proceeds, the fin temperature gradually rises. When the fin temperature rises to the set end cleaning fin temperature T4, the defrosting process stops.

[0048] T3 is preferably -5°C, and T4 is preferably 25°C.

[0049] The condensing fan is reversed to run: in order to more thoroughly remove the residue on the fins, the condensing fan is reversed to run for a period of time t1, t1 is preferably 120 seconds, and the residue is blown off the fin surface by reverse airflow.

[0050] Self-cleaning after shutdown: After the reverse operation of the condensing fan is completed, the condensing fan is stopped, the unit is shut down, and the self-cleaning process is completed.

[0051] Through the above steps, the air source fin self-cleaning control method of the present invention can automatically and efficiently remove dirt on the fins, improve the operating efficiency and reliability of the unit, and reduce manual maintenance costs.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for controlling air source fin self-cleaning, characterized in that: It is equipped with an environmental temperature and humidity sensor, a fin temperature sensor, a compressor, a condensing fan, a condenser, an evaporator, a four-way valve and a control system, wherein: The ambient temperature and humidity sensor and the fin temperature sensor are connected to the control system through signal lines, and the measured data are transmitted to the control system for processing; the control system controls the operating status of the compressor, condensing fan and four-way valve through the control signal line according to the received data; the compressor is connected to the condenser and evaporator of the unit through the refrigerant pipeline to form a refrigeration or heating cycle; the condensing fan provides external air flow for the condenser under normal circumstances; the four-way valve realizes the reversal of the refrigerant flow direction under the control of the control system; Proceed as follows: S1. Turn off the condensing fan to reduce the impact of external air flow on the fin temperature and facilitate the subsequent condensation and frosting process; S2. Use the ambient temperature and humidity sensor to measure the temperature and humidity of the current environment, and calculate the dew point temperature T1 of the air based on these data. The dew point temperature T1 is the temperature at which water vapor in the air begins to condense into dew. When the fin temperature drops below the dew point temperature T1, dew begins to condense on the fin surface, forming condensation. S3, assuming the fin temperature is T2, the compressor continues to run, and the fin temperature is further reduced; when the fin temperature T2 drops below 0°C, frost begins to form on the fin surface; S4, preset the clean wing temperature T3 and end the clean wing temperature T4, keep the fin temperature T2 continuously decreasing until the preset clean wing temperature T3 is reached, at which time enough frost is formed on the fin surface; S5. After reaching the set clean fin temperature T3, the current time is recorded, and the preset stabilization time is t0. After t0 time, frost is stably formed on the fin surface; S6, by controlling the reversing direction of the four-way valve, the flow direction of the refrigerant is changed, thereby starting the defrosting process; at this time, the frost on the condenser begins to melt and takes away the dirt attached to the fins; S7, as the defrosting process proceeds, the fin temperature gradually rises; when the fin temperature rises to the set end-cleaning fin temperature T4, the defrosting process is stopped; S8: After defrosting, in order to more thoroughly remove the residue on the fins, the condensing fan is reversed for a time t1, and the residue is blown off the fin surface by the reverse airflow; S9. After the reverse operation is completed, the condensing fan stops working, the unit stops, and the self-cleaning process ends.

2. The air source fin self-cleaning control method according to claim 1, characterized in that: The clean wing temperature T3 is preset to -5℃.

3. The air source fin self-cleaning control method according to claim 1, characterized in that: The wing temperature T4 at the end of cleaning is preset to 25℃.

4. The air source fin self-cleaning control method according to claim 1, characterized in that: The preset stabilization time t0 is preset to 3 minutes.

5. The air source fin self-cleaning control method according to claim 1, characterized in that: The condensing fan reverse operation time t1 is 120 seconds.

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