WO2018040618A1

WO2018040618A1 - Method and system for detecting dirt blockage of heat exchanger of air conditioner, and air conditioner

Info

Publication number: WO2018040618A1
Application number: PCT/CN2017/084770
Authority: WO
Inventors: 袁光; 李洪涛; 苏立志
Original assignee: 广东美的制冷设备有限公司; 美的集团股份有限公司
Priority date: 2016-08-31
Filing date: 2017-05-17
Publication date: 2018-03-08

Abstract

Disclosed are a method and system for detecting dirt blockage of a heat exchanger of an air conditioner, and an air conditioner. The method comprises the following steps: acquiring the degree of dirt blockage of a dust filter screen at a first fan speed; acquiring the pressure difference between two sides of the dust filter screen to which the degree of dirt blockage of the dust filter screen corresponds at the first fan speed; acquiring the difference between the pressure on the leeward side of the heat exchanger and the pressure on the windward side of the dust filter screen at the first fan speed; generating the pressure difference between two sides of the heat exchanger; and acquiring the level of dirt blockage of the corresponding heat exchanger according to the pressure difference between the two sides of the heat exchanger and the first fan speed. With the method, respective dirt blockage conditions of the dust filter screen and the heat exchanger can be detected simultaneously, such that the air conditioner can be controlled independently, for example, using corresponding cleaning modes to respectively clean the dust filter screen and the heat exchanger at different times. Different control modes of the air conditioner can also be used according to different levels of dirt blockage of the heat exchanger.

Description

Air conditioning heat exchanger dirty blocking detection method, system and air conditioner

Technical field

The invention relates to the field of air conditioning control, in particular to a method, a system and an air conditioner for detecting a dirty block of an air conditioner heat exchanger, and a method, a system and an air conditioner for detecting a dirty block of a heat exchanger based on a single pressure sensor.

Background technique

The heat exchanger is the core component of the air conditioner and plays a vital role in the air conditioning and cooling system. The structure of the heat exchanger is composed of pipes and dense fins. The fins are inserted in series and densely arranged on the pipeline. The gap between them is extremely small, and the fin area is relatively large for heat transfer. Therefore, in the air conditioner During operation, when airflow passes through it, dust and debris in the air can easily adhere to the fins and cause dirty plugging. The effect of the heat exchanger after the dirty plugging is much worse than that of the dust filter. It will not only reduce the airflow of the air conditioner, but also affect the performance of the air conditioner. Moreover, since the heat exchange between indoor and outdoor relies on the fins, the dust will be transferred to the heat exchanger. The efficiency has dropped dramatically. The main purpose of installing dust filter nets in air conditioners is to avoid the dirty plugging of heat exchangers. However, as the running time increases and the environment in which the air conditioners are located, the heat exchangers are inevitably dirty. Moreover, when the air conditioner is in the cooling operation, the fins will condense on the fins, which makes the fins more likely to adhere to the dust, and in the humid environment, it will breed a lot of molds. These molds will spread into the room along with the air outlet of the air conditioner. Health causes great harm and gives the room a special smell. Therefore, it is very important to keep the indoor heat exchanger clean.

As air conditioners become more and more healthy and energy-saving, the new functions of air conditioners are more and more related to health. Therefore, more and more air conditioners have functions such as self-cleaning and heat exchanger cleaning, but for air conditioners. The dirty plugging detection technology using the heat exchanger is almost blank. Most of the existing dirty plugging tests are for the dust filter net or the indoor unit as a whole (the dirty plugging of the filter dust net and the heat exchanger), so the start of the heat exchanger cleaning function is mostly based on the dirty plugging of the indoor unit or the dust filter. Whether the net is dirty or not, or purely according to the running time of the air conditioner and directly open by hand. However, the dust filter and the heat exchanger are different in the ash deposition rate, parasitic bacteria, and cleaning method: the dust collection rate of the dust filter net is fast, and the heat storage device has the protection dust accumulation rate due to the dust filter net. It is relatively slow; the main dust parasites on the dust screen and the bacteria mixed in the air dust, in addition to these bacteria on the heat exchanger, it will breed more molds due to its humid environment; the filter net is clean and simple, manual cleaning or automatic The brush cleaning is easy to implement, the time used is short, and no large energy is consumed, and the heat exchanger is very difficult to clean due to its own structure, and the required method takes a long time and consumes a large amount of energy. In view of these different characteristics of the above dust filter and heat exchanger, the air conditioner needs to be processed separately according to the respective dirty plugging conditions of the two, so it is necessary to separately detect the dirty plugging technology of the indoor heat exchanger.

Summary of the invention

The invention provides a method, a system and an air conditioner for detecting a dirty block of an air conditioner heat exchanger, which solve the above technical problems.

The technical solution of the present invention to solve the above technical problems is as follows:

According to an aspect of the invention, a method for detecting a dirty plug of an air conditioner heat exchanger is provided, comprising the steps of:

Step 1: obtaining a dirty plugging degree of the dust filter under the first fan speed;

Step 2: Obtain a pressure difference between the two sides of the dust filter corresponding to the dirty plugging degree of the dust filter under the first fan speed, and record the first pressure difference;

Step 3: Obtain a difference between the pressure of the leeward side of the heat exchanger and the pressure on the windward side of the dust filter under the first fan speed, and record the difference as the second pressure difference;

Step 4, calculating a difference between the second pressure difference and the first pressure difference to generate a pressure difference on both sides of the heat exchanger;

In step 5, the corresponding heat exchanger dirty plugging level is obtained according to the pressure difference between the two sides of the heat exchanger and the first fan speed.

According to another aspect of the present invention, a system for detecting a dirty block of an air conditioner heat exchanger includes a first acquisition module, a second acquisition module, a third acquisition module, a calculation module, and a fourth acquisition module.

The first obtaining module is configured to acquire a dirty plugging degree of the dust filter under the first fan speed;

The second acquiring module is configured to obtain a pressure difference between the two sides of the dust filter corresponding to the dirty plugging degree of the dust filter under the first fan speed, and record the first pressure difference;

The third obtaining module is configured to obtain a difference between the leeward side pressure of the heat exchanger and the windward side pressure of the dust filter under the first fan speed, which is recorded as a second pressure difference;

The calculating module is configured to calculate a difference between the second pressure difference and the first pressure difference, and generate a pressure difference on both sides of the heat exchanger;

The fourth acquiring module is configured to obtain a corresponding heat exchanger dirty blocking level according to the pressure difference between the two sides of the heat exchanger and the first fan speed.

In order to solve the technical problem of the present invention, the present invention also provides an air conditioner comprising the air conditioner heat exchanger dirty block detecting system described above.

The invention has the beneficial effects that the air conditioning heat exchanger dirty blocking detecting method and the detecting system of the invention not only have a simple detecting method and an accurate detection result, but also can detect the dirty blocking of the air conditioner indoor unit, the dust filter net and the heat exchanger at the same time. The situation, so that the air conditioner is independently controlled according to the respective dirty plugging conditions, for example, the dust filter net or the heat exchanger is respectively cleaned by corresponding cleaning methods at different times; meanwhile, according to the different dirty plugging levels of the heat exchanger, the air conditioner is different. The control method enriches the function of the air conditioner and improves the user satisfaction.

The invention also provides a heat exchanger dirty block detecting method, system and air conditioner based on a single pressure sensor, which solves the above technical problems.

According to an aspect of the invention, a method for detecting a dirty heat exchanger of a heat exchanger based on a single pressure sensor is provided, comprising the steps of:

Step 10: obtaining a dirty plugging degree of the dust filter under the first fan speed;

Step 20: Obtain a pressure difference between the two sides of the dust filter corresponding to the dirty plugging degree of the dust filter under the first fan speed, and record the first pressure difference;

Step 30: collecting a pressure value of the leeward side of the heat exchanger at the first fan speed, and calculating a difference between the pressure value of the leeward side of the heat exchanger and the pressure value of the windward side of the dust filter corresponding to the first fan speed, to generate a Two pressure difference;

Step 40, calculating a difference between the second pressure difference and the first pressure difference to generate a pressure difference on both sides of the heat exchanger;

Step 50: Obtain a corresponding heat exchanger dirty plugging level according to the pressure difference between the two sides of the heat exchanger and the first fan speed.

According to another aspect of the present invention, a heat exchanger dirty block detection system based on a single pressure sensor is further provided, including a first acquisition module, a second acquisition module, a third acquisition module, a calculation module, and a fourth acquisition module.

The third acquiring module is configured to collect a pressure value of the leeward side of the heat exchanger at the first fan speed, and calculate a pressure value of the leeward side of the heat exchanger and a pressure value of the windward side of the dust filter corresponding to the first fan speed a difference, generating a second pressure difference;

In order to solve the technical problem of the present invention, the present invention also provides an air conditioner comprising the heat exchanger dirty block detecting system based on a single pressure sensor as described above.

DRAWINGS

1 is a schematic flow chart of a method for detecting a dirty plugging of an air conditioner heat exchanger in Embodiment 1;

2 is a schematic structural view of a dirty block detecting system of an air conditioner heat exchanger in Embodiment 1;

3 is a schematic structural view of a photodetecting unit in Embodiment 1;

4 is a schematic structural view of a photodetecting unit in Embodiment 2;

5 is a schematic flow chart of a method for detecting a dirty block of an air conditioner heat exchanger in Embodiment 3;

6 is a schematic structural view of a dirty plugging detection system of an air conditioner heat exchanger in Embodiment 3;

7 is a schematic structural view of an air conditioner according to Embodiment 4;

8 is a schematic flow chart of a method for detecting a dirty block of a heat exchanger in Embodiment 5;

9 is a schematic structural view of a heat exchanger dirty plugging detection system in Embodiment 5;

10 is a schematic structural view of a photodetecting unit in Embodiment 5;

Figure 11 is a schematic structural view of a photodetecting unit in Embodiment 6;

12 is a schematic flow chart of a method for detecting a dirty blockage of a heat exchanger in Embodiment 7;

Figure 13 is a schematic structural view of a heat exchanger dirty block detecting system in Embodiment 7;

Figure 14 is a schematic structural view of an air conditioner according to Embodiment 8;

In the above figures, each reference number is specifically:

1. Single-chip microcomputer, 2. First switch control circuit, 3. Infrared light-emitting diode, 4. Photodiode, 5. Power supply module, 6. Connector, 7. Filter net, 8. Detection module, 9. Transmitting and receiving module, 10 And a second switch control circuit.

detailed description

The principles and features of the present invention are described in the following with reference to the accompanying drawings.

The air duct design of the split wall air conditioner is that the air first passes through the filter dust net at the air inlet end, then passes through the heat exchanger, and finally enters the wind wheel cavity. Based on this structure, the degree of dirty plugging of the heat exchanger can be obtained according to the overall dirty plugging degree of the air conditioner indoor unit, that is, the overall dirty plugging degree of the heat exchanger and the filter dust net, and the dirty plugging degree of the separate dust filter net.

The method for detecting the dirty blockage of the air conditioner heat exchanger of the present invention comprises the following steps:

The method for detecting the dirty level of the indoor unit of the invention adopts the double side pressure detecting method. The degree of dirty plugging of the air conditioner will directly affect the pressure difference between the two sides. The more serious the dirty plug, the greater the resistance to air circulation, and the greater the pressure difference between the two sides. In addition, the different speeds of the wind wheel will also affect the pressure difference between the two sides. Therefore, the degree of dirty plugging can be detected by the pressure difference, and the wind speed factor of the fan can be accurately detected to detect the dirty degree of the air conditioner indoor unit. At the same time, in the present invention, the above solution has two implementation methods, one is to keep the current fan speed unchanged, calculate the dirty plugging level of the heat exchanger under the current fan speed, and the other is to adjust the current fan speed to the target fan. Speed, calculate the dirty plug level of the heat exchanger at the target fan speed,

The above two methods are specifically described below through two embodiments.

FIG. 1 is a schematic flow chart of a method for detecting a dirty blockage of an air-conditioning heat exchanger according to Embodiment 1, including the following steps:

Step 1: Obtain the current fan speed and the dirty degree of the dust filter;

Step 2: Obtain a pressure difference between the dust filter net corresponding to the degree of dirty plugging of the dust filter under the current fan speed, and record the first pressure difference;

Step 3: obtaining the difference between the leeward side pressure of the heat exchanger and the windward side pressure of the dust filter under the current fan speed, and recording the difference as the second pressure difference;

Step 5: Obtain a corresponding heat exchanger dirty plugging level according to the pressure difference between the two sides of the heat exchanger and the current fan speed.

The above steps will be described in detail below by way of Specific Example 1.

In step 1 of the embodiment, the current fan speed is collected by the wind speed sensor, and the dirty plugging degree of the dust filter is directly obtained by the photoelectric detecting method. In other embodiments, the degree of dirty dust filter can also be obtained by other methods, and will not be described in detail herein. In this embodiment, obtaining the dirty plugging degree of the dust filter by the photoelectric detecting method includes the following steps:

S101, controlling the light emitting unit to illuminate the dust filter net;

S102, controlling the photosensitive element to receive the transmitted light transmitted through the dust filter;

S103, converting the light intensity of the transmitted light received by the photosensitive element into a value for indicating the degree of dirty plugging of the dust filter. In the embodiment, the value is a voltage value of a resistor connected in series with the photosensitive element.

In this embodiment, the voltage across the collected resistor can be transmitted to the single-chip microcomputer, and then the analog voltage signal built in the single-chip microcomputer can be used to convert the analog voltage signal at both ends of the resistor into a digital information value, and the value of the dust filter is represented by the value. Dirty blockage. In the first embodiment, the greater the voltage across the resistor, the larger the value converted by the single-chip microcomputer into digital information, indicating that the greater the light intensity that is transmitted, the less severe the dust filter is dirty. In other embodiments, the reflected light reflected by the dust filter may be collected by the photosensitive element, and the light intensity of the reflected light is converted into a numerical value indicating the degree of dirty plugging of the dust filter, and the digital information converted at this time is converted. The larger the value, the smaller the light intensity that is transmitted, and the more severe the filter dust is blocked. This method is not only simple in structure, low in cost and accurate in detection results, and can be directly installed and used in an air conditioner, and the installation and use process is also very simple. In this embodiment, in order to ensure the accuracy of the obtained dirty dust filter degree value, the voltage value at both ends of the resistance may be continuously collected, and after the maximum value and the minimum value are removed, the average value of the other voltage values is averaged to obtain the current dust filter. The degree of dirty plugging of the net, for example, after sampling the voltage values at both ends of the resistor for 7 consecutive times, after removing the maximum value and the minimum value, the average value of the other five voltage values is taken to obtain the current degree of dirty dust filter.

In step 2 of the embodiment, the filter function corresponding to the dirty plugging degree of the dust filter net and the pressure difference between the two sides of the filter dust net is calculated according to the first function relationship between the dust plugging degree of the dust filter net and the pressure difference between the two sides of the dust filter net. The pressure difference on both sides of the net is recorded as the first differential pressure. In this embodiment, the first functional relationship is obtained during the data testing process of the air conditioner, and is already solidified in the air conditioner operation before the air conditioner leaves the factory. The program is used for convenient query. In the data testing process, establishing the first functional relationship includes the following steps:

S201, the fan operating speed range is divided into a plurality of speed ranges according to a preset speed span; the speed span ranges from 30 to 120, and the value is too small, the measured pressure value does not change, and the value is too large. Affecting the accuracy of the final dirty plug detection result, the preferred selection in this embodiment is 50r/min;

S202, when obtaining the first use of the air conditioner, the degree of dirty dust filter corresponding to the rotation speed value at the midpoint of each speed interval and the pressure difference between the two sides of the dust filter are set as the first group value;

S203, after a preset time, for example, after one year and the dust filter has not been cleaned, the dust filter level corresponding to the rotation speed value at each midpoint of each speed interval and the pressure difference between the two sides of the filter net are obtained again, and the second group is set. Numerical value

S204, according to the first set of values and the second set of values, establish a linear function of the degree of dirty plugging of the dust filter and the pressure difference between the two sides of the filter net in each speed range. By establishing the linear function, the voltage value can be correspondingly matched with the pressure difference between the two sides of the dust filter under the same dirty plugging degree of the dust filter to ensure the consistency of the dirty plugging degree of the dust filter. By selecting the corresponding first functional relationship formula of the current fan speed, and then bringing in the dirty plugging degree of the dust filter obtained in step 1, the pressure difference ΔPv on both sides of the dust filter net at the current fan speed can be obtained.

In step 3 of the embodiment, the pressure value of the leeward side of the heat exchanger and the pressure value of the windward side of the dust filter are respectively collected by two pressure sensors, and the pressure difference ΔP of the entire indoor unit under the current fan speed is obtained. △P = pressure value on the leeward side of the heat exchanger - the pressure on the windward side of the dust filter. In order to ensure the accuracy of the pressure difference ΔP, the following method may also be adopted in the embodiment: maintaining the current fan speed unchanged, continuously collecting the pressure value of the leeward side of the heat exchanger through the first pressure sensor, and continuously through the second pressure sensor Collecting the pressure value on the windward side of the dust filter net, and separately calculating the difference between the two; respectively, taking the average value directly or removing the maximum value and the minimum value, and taking the average value to obtain the second pressure difference, for example, the acquisition of the seventh consecutive time After the difference is described, the maximum value and the minimum value are removed, and the average of the remaining five difference values is obtained to obtain the second pressure difference. The data acquisition process of this method is simple and reliable, and the detection data is accurate and less affected by other factors.

In step 4 of the embodiment, the difference between the second differential pressure ΔP and the first differential pressure ΔPv is calculated, that is, The pressure difference ΔPe on both sides of the heat exchanger can be obtained, and the pressure on both sides of the heat exchanger is obtained by querying the pre-established heat exchanger dirty plugging level and the first corresponding relationship table between the fan speed and the pressure difference between the two sides of the heat exchanger. The difference ΔPe corresponds to the dirty heat exchanger level at the current fan speed. In this embodiment, the first correspondence table is obtained during the data testing process of the air conditioner, and is already solidified in the air conditioning running program before the air conditioner leaves the factory to facilitate querying and using. In the data testing process, establishing the first correspondence table includes the following steps:

S401, the fan operating speed range is divided into a plurality of speed ranges according to a preset speed span; the speed span ranges from 30 to 120, and the value is too small, the measured pressure value does not change, and the value is too large. Affecting the accuracy of the final dirty plug detection result, the preferred selection in this embodiment is 50r/min;

S402, when obtaining the first use of the air conditioner, the pressure difference between the two sides of the heat exchanger corresponding to the rotation speed value at the midpoint of each speed interval is set to a first value;

S403, after a preset time, for example, after eight years and the heat exchanger has not been cleaned, re-acquiring the pressure difference between the two sides of the heat exchanger corresponding to the rotation speed value in the middle point of each speed interval, and the heat exchangers are two The side pressure difference is set to a second value; the first value and the second value form a value range of the pressure difference between the two sides of the heat exchanger corresponding to the speed range;

S404, the value range of the pressure difference between the two sides of the heat exchanger is equally divided according to a preset number of dirty plugging levels, and the sides of the heat exchanger corresponding to the dirty plugging level of each heat exchanger are obtained under the speed range. The pressure difference range. In this embodiment, the number of the equal divisions can be arbitrarily selected according to requirements, and only a certain span of the pressure difference in each dirty plugging level can be satisfied. For example, in the embodiment, the pressure difference range is equally divided into four small segments. Range, each small range corresponds to a dust filter level of dust filter, which is divided into 4 levels.

After the dirty plugging level of the heat exchanger is obtained by the dirty plugging detection method of the present invention, different control modes can be adopted for the air conditioner according to different heat exchanger dirty plugging levels, for example, in this embodiment:

When the heat exchanger is dirty and the level is z1, the dirty plug level is displayed through the display panel;

When the heat exchanger is dirty and the level is z2, the dirty plug level is displayed through the display panel, and the buzzer is used to prompt the buzzer when the power is turned on;

When the heat exchanger is dirty level of z3, the dirty plug level is displayed through the display panel, and the buzzer is used to make a buzzer or intelligent voice prompt in the short-time and multiple times when the air conditioner is turned on and/or running. Displaying and driving the cleaning unit to perform automatic cleaning using a corresponding cleaning method;

When the heat exchanger is dirty and the level is z4, the dirty plug level is displayed through the display panel, and the buzzer is used to make a buzzer or a smart voice prompt in a short time and multiple times when the air conditioner is turned on and/or running. And controlling the air conditioner to stop running; in the control mode, the higher the dirty plugging level, the more serious the heat exchanger is dirty. In a specific embodiment, the time of the buzzer or the smart voice prompt can be set in the non-sleep time to ensure the user's sleep quality.

In other embodiments, the dust filter net and/or the heat exchanger may be separately cleaned according to the dirty plugging degree of the dust filter and the dirty plugging level of the heat exchanger at different or the same time.

2 is a schematic structural diagram of a dirty block detection system of an air conditioner heat exchanger corresponding to the method of Embodiment 1, including a first acquisition module, a second acquisition module, a third acquisition module, a calculation module, and a fourth acquisition module. ,

The first acquiring module is configured to acquire a current fan speed and a dust filter network dirty blocking degree;

The second acquiring module is configured to obtain a pressure difference between the two sides of the dust filter corresponding to the dirty plugging degree of the dust filter under the current fan speed, and record the first pressure difference;

The third obtaining module is configured to obtain a difference between the leeward side pressure of the heat exchanger and the windward side pressure of the dust filter under the current fan speed, which is recorded as a second pressure difference;

The fourth obtaining module is configured to obtain a corresponding heat exchanger dirty blocking level according to the pressure difference between the two sides of the heat exchanger and the current fan speed.

In this embodiment, the method further includes a control module, wherein the control module is configured to adopt different control modes for the air conditioner according to different heat exchanger dirty plugging levels; and/or according to the dirty plugging degree of the dust filter and the dirty plugging level of the heat exchanger. Clean the filter screen and/or heat exchanger separately by using the corresponding cleaning method.

In this embodiment, the first acquiring module includes a wind speed collecting unit for collecting the fan speed and a dust filter dirty detecting unit for acquiring the dirty plugging degree of the dust filter. As shown in FIG. 3, it is a schematic structural diagram of a dirty filter detecting unit of the dust filter according to the embodiment, wherein the dust filter detecting unit includes a connection a transmitting and receiving module 9 and a detecting module 8 connected to the plug-in 6, the detecting module 8 comprising a light emitting unit 3 for emitting light to the dust filter net 7 and a light-sensitive element 4 for receiving transmitted light transmitted through the dust filter net 7, The transmitting and receiving module 9 is for controlling the light emitting unit 3 to emit light and for converting the light intensity of the transmitted light received by the photosensitive element 4 into a value for indicating the degree of dirty plugging of the dust filter 7. In this embodiment, the light emitting unit 3 is an infrared light emitting diode; the photosensitive element 4 is a photodiode, and in other embodiments, the photosensitive element 4 may also be a phototransistor. In this embodiment, the transmitting and receiving module 9 includes a single chip microcomputer 1, a first switch control circuit 2, and a conversion circuit for converting a photocurrent of the photodiode into a voltage, and the first IO port of the single chip microcomputer 1 is connected to the first switch. The control circuit 2, the first switch control circuit 2 is connected to the infrared light emitting diode through a connector 6, and the conversion circuit is connected to the analog input port of the single chip microcomputer 1. The conversion circuit includes a resistor R4 connected in series with the photosensitive element. The resistor R4 is connected to the analog input port of the single chip 1 at the same time as the series end of the photosensitive element, and the other end of the resistor R4 is grounded.

In this embodiment, the base of the transistor Q1 in the first switch control circuit is connected to the first IO port of the single chip via the resistor R1, the collector is connected to the light emitting unit via the resistor R3, and the emitter is grounded. The base of the transistor Q1 is also connected in series with the pull-down resistor R2 and grounded. In this embodiment, a triode switch circuit is used, and when the detection is required, the illumination is turned on, and when the detection is not required, the control circuit is simple, and the energy consumption can be saved to the utmost. Meanwhile, in this embodiment, the collector of the triode is connected to the infrared light emitting diode LED through the resistor R3, and the resistor R3 is an LED current limiting protection resistor, which can ensure a suitable current flows in the LED, and improve the effect of the dirty filter detecting unit of the dust filter. At the same time, the infrared light-emitting diode is protected from damage due to excessive current.

In this embodiment, the first IO port of the single-chip microcomputer 1 of the filter dust dirty detection unit outputs a high-low level signal.

No., through the high and low level signal control transistor Q1 turn on and off to energize the infrared light emitting diode LED, the infrared light emitted by the LED passes through the dust filter net, part of the light is reflected, scattered and absorbed by the dust attached to the dust filter net 7 It does not allow the filter to pass through the filter, so that the transmitted light is reduced, and the more dust is attached, the less light is transmitted. The photodiode 4 is a photosensitive element that is irradiated thereon The more light, the larger the photocurrent through it, the more it is connected in series with the resistor R4. The ohmic law u=ir can be used to convert the photocurrent into a voltage, and the voltage across the resistor R4 is collected and transmitted to the microcontroller, and then the microcontroller is used. 1 built-in analog-to-digital converter, the analog voltage signal can be converted into digital information value, and this value is used to indicate the dirty plugging degree of the dust filter. In this embodiment, the voltage across the resistor R4 is larger, and the single-chip computer converts into digital information value. The larger the light intensity, the more light the dust filter is.

As shown in FIG. 4, it is a schematic structural diagram of a dust filter detecting unit in the second embodiment. Compared with FIG. 3, a second switch control circuit 10 for controlling the opening and closing of the photosensitive element is added, and the second switch is controlled. The circuit is connected to the second IO port of the single chip microcomputer, and controls the opening and closing of the second switch control circuit by the high and low level signals corresponding to the output of the IO port. When the dust filter is not detected, the circuit can be reliably turned off. Compared with the unit without the switch control circuit, the light current generated on the transmitting and receiving module when the light is irradiated to the photosensitive element in the non-detecting time environment is avoided. Consumption. In this embodiment, the second switch control circuit 10 is a triode switch circuit, including a triode Q2, a resistor R6 and a resistor R7. The base of the transistor Q2 is connected to the second IO port of the single chip via a resistor R6, and the collector is A resistor R4 is connected to the series terminal of the photosensitive element and resistor R5, and the emitter is grounded. The base of the transistor Q1 is also grounded in series with the pull-down resistor R7. The triode switch circuit is used to turn on the illumination when it needs to be detected, and is turned off when no detection is needed. The control circuit is simple, and the energy consumption can be saved to the utmost.

In the embodiment corresponding to FIG. 3 and FIG. 4, the first switch control circuit, the second switch control circuit, and the conversion circuit are all integrated in the main control board, and the power control module 5 is further disposed on the main control board, and the power supply module is 5 respectively connecting the infrared light emitting diode and the photodiode for supplying power to the infrared light emitting diode and the photodiode. The power supply module is a five-volt regulated filter power supply. The external device of the dirty filter detecting unit of the dust filter of the invention only includes the light emitting unit and the photosensitive element, and the remaining control circuit parts are arranged on the main control board, and only two connecting lines are needed to realize signal transmission and reception, and then By adding a connection cable to the power supply module, the entire detection scheme can be realized, thereby reducing the connection line, occupying a small space, being easy to implement, and reducing the cost. At the same time, the light emitting unit and the photosensitive element are small in size, which greatly reduces the occupied space, thereby reducing the influence of the external device on the dust attached to the dust filter, and ensuring the accuracy of the detection result. At the same time, the power supply module is simple, no complicated power supply is needed, and only the motherboard 5v can supply power. By powering Parallel connection of a grounded capacitor C1 on the source can remove the noise interference of the direct current, making the power supply cleaner and reducing noise.

In the embodiment corresponding to FIG. 3 and FIG. 4, the single chip microcomputer includes an analog-to-digital converter, and the conversion circuit is connected to the analog-to-digital converter via an analog input port of the single chip microcomputer, and converts the voltage analog signal into an analog-to-digital converter. The digital signal is used to detect the obtained light intensity information, so that the dirty plugging degree of the dust filter net can be obtained, thereby facilitating the information processing and other functions to judge the information. In this embodiment, the output pin of the analog-to-digital converter of the single chip microcomputer is connected to a resistor R5 and then connected to a grounded capacitor C2, which can function as a current limiting and decoupling. In other embodiments, it is also possible to detect the degree of dirty plugging of the dust filter by receiving the light intensity of the reflected light diffused and reflected by the filter dust net, and the structure of the detecting unit and the dust filter dirty detecting unit of the first embodiment and the second embodiment Basically the same, it is only necessary to replace the photodiode with a photodiode or a phototransistor for receiving reflected light diffusely reflected by the dust filter. In this embodiment, the greater the voltage across the resistor in series with the photodiode or the phototransistor, the greater the value converted by the single-chip microcomputer into digital information, indicating that the greater the reflected light intensity, the more dust and dust on the dust filter net, and the dust filter net. The more serious the dirty blockage.

As shown in FIG. 2, in the embodiment, the second acquiring module includes: a first storage unit, configured to store a first function of a pre-established degree of dirty plugging of the dust filter and a pressure difference between the two sides of the filter net under different fan speeds. a first calculating unit, configured to bring the dirty plugging degree of the dust filter into the first functional relationship corresponding to the current fan speed, and generate a dirty plugging degree of the dust filter corresponding to the current fan speed. The pressure difference between the two sides of the filter net.

The third obtaining module comprises: a first pressure sensor disposed on the leeward side of the heat exchanger for continuously collecting the pressure on the leeward side of the heat exchanger; and a second pressure sensor disposed on the windward side of the dust filter for continuously collecting the dust filter The pressure on the windward side of the net; the second calculating unit is used for calculating the difference between the pressure on the leeward side of the heat exchanger and the pressure on the windward side of the dust filter, and taking the mean value directly or removing the maximum value and the minimum value The second pressure difference. The fourth obtaining module includes: a second storage unit, configured to store a pre-established heat exchanger dirty plugging level and a fan speed, and a first correspondence table between pressure differences on both sides of the heat exchanger; the query unit is configured to query the location The first correspondence table is obtained, and the pressure difference between the two sides of the heat exchanger is obtained in the current wind The corresponding heat exchanger is dirty at the machine speed.

The air conditioning heat exchanger dirty blocking detecting method and the detecting system of the embodiment not only have a simple detecting method and an accurate detection result, but also can detect the dirty blocking condition of the air conditioner indoor unit, the dust filter net and the heat exchanger at the same time, thereby The air conditioning is independently controlled by the dirty plugging situation. For example, the dust filter net or the heat exchanger is cleaned by corresponding cleaning methods at different times. At the same time, according to different dirty plugging levels of the heat exchanger, different control modes are adopted for the air conditioner, enriching the air conditioner. The features that improve user satisfaction.

FIG. 5 is a schematic flow chart of another method for detecting a dirty plugging of an air-conditioning heat exchanger according to Embodiment 3, including the following steps:

In step 1, the current fan speed is adjusted to a preset target fan speed, and the dust filter network is blocked at the target fan speed;

Step 2: According to the target fan speed, obtain the pressure difference between the two sides of the dust filter corresponding to the dirty plugging degree of the dust filter, and record it as the first pressure difference;

Step 3, obtaining the difference between the pressure on the leeward side of the heat exchanger and the pressure on the windward side of the dust filter under the target fan speed, which is recorded as the second pressure difference;

In step 5, the corresponding heat exchanger dirty plugging level is obtained according to the pressure difference between the two sides of the heat exchanger.

In the first step, the degree of dirty plugging of the dust filter can be directly obtained by the photoelectric detecting method. The specific method is the same as that in the first embodiment, and will not be described in detail herein. In step 2 of the embodiment, the differential pressure between the dust filter net and the pressure difference between the two sides of the filter dust net is determined by a pre-established target fan speed, and the pressure difference between the dust filter net and the dust filter net is calculated. , recorded as the first pressure difference. In this embodiment, the second functional relationship is obtained during the data testing process of the air conditioner, and is already solidified in the air conditioning running program before the air conditioner leaves the factory to facilitate query and use. In the data testing process, establishing the second functional relationship includes the following steps:

S201, when obtaining the first use of the air conditioner, the dust filter network corresponding to the target fan speed and the pressure difference between the two sides of the filter net are set as the first group of values;

S202. After a preset time, for example, after one year and the dust filter has not been cleaned, obtain again. The degree of dirty plugging of the dust filter corresponding to the target fan speed and the pressure difference between the two sides of the filter net are set to the second group value;

S203. Establish a linear function of the degree of dirty plugging of the dust filter and the pressure difference between the two sides of the dust filter according to the first set of values and the second set of values. By establishing the linear function, the voltage value can be correspondingly matched with the pressure difference between the two sides of the dust filter under the same dirty plugging degree of the dust filter to ensure the consistency of the dirty plugging degree of the dust filter. By bringing the degree of dirty dust filter obtained in step 1 into the functional relationship, the pressure difference ΔPv on both sides of the dust filter at the target fan speed can be obtained.

In step 3 of the embodiment, the pressure difference ΔP on both sides of the entire indoor unit under the target fan speed is directly obtained by the algorithm, and the ΔP=the pressure value of the leeward side of the heat exchanger-the pressure value of the windward side of the dust filter. In order to ensure the accuracy of the pressure difference ΔP, the following method may also be adopted in the embodiment: maintaining the target fan speed unchanged, continuously collecting the pressure value of the leeward side of the heat exchanger through the first pressure sensor, and continuously through the second pressure sensor Collecting the pressure value on the windward side of the dust filter net, and separately calculating the difference between the two; respectively, taking the average value directly or removing the maximum value and the minimum value, and taking the average value to obtain the second pressure difference, for example, the acquisition of the seventh consecutive time After the difference is described, the maximum value and the minimum value are removed, and the average of the remaining five difference values is obtained to obtain the second pressure difference. The data acquisition process of this method is simple and reliable, accurate and less affected by other factors.

In step 4 of the embodiment, calculating the difference between the second pressure difference ΔP and the first pressure difference ΔPv, the pressure difference ΔPe on both sides of the heat exchanger can be obtained, and the target fan speed is established by querying in advance. The second correspondence table of the dirty plugging level of the heat exchanger and the pressure difference between the two sides of the heat exchanger obtains the dirty plugging level of the heat exchanger corresponding to the pressure difference ΔPe on both sides of the heat exchanger. In this embodiment, the second correspondence table is obtained during the data testing process of the air conditioner, and is already solidified in the air conditioning running program before the air conditioner leaves the factory to facilitate querying and using. In the data testing process, establishing the second correspondence table includes the following steps:

S401, when obtaining the first use of the air conditioner, the pressure difference between the two sides of the heat exchanger corresponding to the target fan speed is set to a first value;

S402, after a preset time, for example, after eight years and the heat exchanger has not been cleaned, the pressure difference between the two sides of the heat exchanger corresponding to the target fan speed is obtained again, and the pressure difference between the two sides of the heat exchanger is set to a second value; the first value and the second value form a value range of a pressure difference between the two sides of the heat exchanger corresponding to the target fan speed;

S403, the value range of the pressure difference on both sides of the heat exchanger is performed according to a preset number of dirty plugging levels. According to the target fan speed, the pressure difference between the two sides of the heat exchanger corresponding to the dirty plugging level of each heat exchanger is obtained. In this embodiment, the number of the equal divisions can be arbitrarily selected according to requirements, and only a certain span of the pressure difference in each dirty plugging level can be satisfied. For example, in the embodiment, the pressure difference range is equally divided into four small segments. Range, each small range corresponds to a dust filter level of dust filter, which is divided into 4 levels.

After the dirty plugging level of the heat exchanger is obtained by the dirty plugging detection method of the present invention, different control modes of the air conditioner may be adopted according to different dirty heat blocking levels of the heat exchanger or according to the dirty plugging degree of the dust filter and the dirty plugging level of the heat exchanger. At different or the same time, the dust filter and/or the heat exchanger are separately cleaned by corresponding cleaning methods.

In the method of the invention, the fan speed is adjusted to the target fan speed at each detection. Therefore, when establishing the above functional relationship, mapping relationship table or correspondence table, only the data under the target fan speed needs to be measured. Not only the measured data is less, it is easier to obtain the measured data to establish the above functional relationship, mapping relationship table or correspondence table; and the detection method is simple, the detection time is short, the obtained detection result is accurate, and the short-term speed regulation does not affect the air conditioner. Performance does not affect the normal use of the user.

In the embodiment of the invention, the target fan speed is the most commonly used speed during the air conditioning operation, and thus has little effect on the normal operation of the air conditioner. In other embodiments of the present invention, a plurality of target fan speeds may also be preset, so that when the method of the present invention is applied, the closest target fan speed can be selected according to the current fan speed, and the current fan speed can be avoided as much as possible. Adjustment, not only the control process is simpler, but also can ensure the accuracy of the dirty plug level detection results.

As shown in FIG. 6 , a schematic structural diagram of a dirty block detection system for an air conditioner heat exchanger corresponding to the method of the third embodiment includes an adjustment module, a first acquisition module, a second acquisition module, a third acquisition module, a calculation module, and a Four acquisition modules,

The adjusting module is configured to adjust a current fan speed to a preset target fan speed;

The first acquiring module is configured to acquire a dirty plugging degree of the dust filter under the target fan speed;

The second obtaining module is configured to obtain a pressure difference between the two sides of the dust filter corresponding to the dirty plugging degree of the dust filter according to the target fan speed, and record the first pressure difference;

The third obtaining module is configured to acquire the leeward side pressure of the heat exchanger and the filter dust net at the target fan speed The difference in wind side pressure is recorded as the second pressure difference;

The fourth obtaining module is configured to obtain a corresponding heat exchanger dirty blocking level according to the pressure difference between the two sides of the heat exchanger.

In this embodiment, the first acquiring module includes a dust filter dirty detecting unit for acquiring a dirty plugging degree of the dust filter. The specific structure is as shown in the corresponding embodiments of FIG. 3 and FIG. 4, and will not be specifically described herein.

In this embodiment, the second acquiring module includes: a first storage unit, configured to pre-establish a second function relationship between a dirty plugging degree of the dust filter net and a pressure difference between the two sides of the dust filter net at the target fan speed; the first calculating unit And the method for introducing the dirty plugging degree of the dust filter into the second functional relationship, and generating a pressure difference between the two sides of the dust filter corresponding to the dirty plugging degree of the dust filter.

The third obtaining module includes: the third acquiring module includes: a first pressure sensor disposed on a leeward side of the heat exchanger, configured to continuously collect pressure on a leeward side of the heat exchanger; and a second set on a windward side of the dust filter net The pressure sensor is used for continuously collecting the pressure on the windward side of the dust filter; the second calculating unit is used for calculating the difference between the pressure on the leeward side of the heat exchanger and the pressure on the windward side of the dust filter, and directly taking the mean value or removing the maximum value Taking the mean value and the minimum value to obtain the second pressure difference.

The fourth obtaining module includes: a second storage unit, configured to store a second correspondence table of the heat exchanger dirty blocking level and the pressure difference between the two sides of the heat exchanger in the pre-established target fan speed; the query unit uses And querying the second correspondence table to obtain a dirty plugging level of the heat exchanger corresponding to the pressure difference on both sides of the heat exchanger.

The air conditioning heat exchanger dirty blocking detecting method and the detecting system of the embodiment not only have a simple detecting method and an accurate detection result, but also can detect the dirty blocking condition of the air conditioner indoor unit, the dust filter net and the heat exchanger at the same time, thereby The dirty plugging situation controls the air conditioner independently, for example, at different times. The cleaning method cleans the dust filter or the heat exchanger separately. At the same time, according to different dirty plugging levels of the heat exchanger, different control modes are adopted for the air conditioner, which enriches the function of the air conditioner and improves the user satisfaction.

As shown in FIG. 7 , it is a schematic structural diagram of an air conditioner according to Embodiment 4, which includes the air conditioner heat exchanger dirty block detecting system described above.

The single pressure sensor based heat exchanger dirty plugging detection method of the present invention comprises the following steps:

The invention detects the degree of dirtyness of the indoor unit through a pressure sensor. The degree of dirty plugging of the air conditioner will directly affect the pressure difference between the two sides. The more serious the dirty plug, the greater the resistance to air circulation, and the greater the pressure difference between the two sides. In addition, the different speeds of the wind wheel will also affect the pressure difference between the two sides. Therefore, the degree of dirty plugging can be detected by the pressure difference, and the wind speed factor of the fan can be accurately detected to detect the dirty degree of the air conditioner indoor unit. Since the pressure on the leeward side of the heat exchanger can only be measured when the detection function is turned on during the operation of the air conditioner, the pressure on the windward side of the dust filter at different wind speeds is measured in advance and recorded in the program. During the detection process, the pressure on the leeward side of the heat exchanger is tested and then the pressure on the windward side of the filter screen at the corresponding speed is found, and the pressure difference between the two sides can be obtained. At the same time, in the present invention, the above solution has two implementation methods, one is to keep the current fan speed unchanged, calculate the dirty plugging level of the heat exchanger under the current fan speed, and the other is to adjust the current fan speed to the target fan. For the rotational speed, the dirty plugging level of the heat exchanger is calculated at the target fan speed. The above two methods are specifically described below through two embodiments.

As shown in FIG. 8, the heat exchanger of the present embodiment 5 is based on a single pressure sensor. The schematic diagram of the process, including the following steps:

Step 10: Obtain the current fan speed and the dirty degree of the dust filter;

Step 20: Obtain a pressure difference between the two sides of the dust filter corresponding to the dirty plugging degree of the dust filter under the current fan speed, and record the first pressure difference;

Step 30: Collect the pressure value of the leeward side of the heat exchanger under the current fan speed, and calculate a difference between the pressure value of the leeward side of the heat exchanger and the pressure value of the windward side of the dust filter corresponding to the current fan speed to generate a second pressure. difference;

Step 50: Obtain a corresponding heat exchanger dirty plugging level according to the pressure difference between the two sides of the heat exchanger and the current fan speed.

In step 10 of the embodiment, the current fan speed is collected by the wind speed sensor, and the dirty plugging degree of the dust filter is directly obtained by the photoelectric detecting method. In other embodiments, the degree of dirty dust filter can also be obtained by other methods, and will not be described in detail herein. In this embodiment, obtaining the dirty plugging degree of the dust filter by the photoelectric detecting method includes the following steps:

S501, controlling the light emitting unit to illuminate the dust filter net;

S502, controlling the photosensitive element to receive the transmitted light transmitted through the dust filter;

S503, converting the light intensity of the transmitted light received by the photosensitive element into a value for indicating the degree of dirty plugging of the dust filter. In the embodiment, the value is a voltage value of the resistor connected in series with the photosensitive element.

In this embodiment, the voltage across the collected resistor can be transmitted to the single-chip microcomputer, and then the analog voltage signal built in the single-chip microcomputer can be used to convert the analog voltage signal at both ends of the resistor into a digital information value, and the value is used to represent the dust filter network. The degree of dirty blockage. In the fifth embodiment, the greater the voltage across the resistor, the larger the value converted by the single-chip microcomputer into digital information, indicating that the greater the light intensity that is transmitted, the less severe the dust filter is dirty. In other embodiments, the reflected light reflected by the dust filter may be collected by the photosensitive element, and the light intensity of the reflected light is converted into a numerical value indicating the degree of dirty plugging of the dust filter, and the digital information converted at this time is converted. The larger the value, the smaller the light intensity that is transmitted, and the more severe the filter dust is blocked. This method is not only simple in structure, low in cost, but also accurate in detection results, and can be directly installed in an air conditioner. Use, and the installation process is also very simple. In this embodiment, in order to ensure the accuracy of the obtained dirty dust filter degree value, the voltage value at both ends of the resistance may be continuously collected, and after the maximum value and the minimum value are removed, the average value of the other voltage values is averaged to obtain the current dust filter. The degree of dirty plugging of the net, for example, after sampling the voltage values at both ends of the resistor for 7 consecutive times, after removing the maximum value and the minimum value, the average value of the other five voltage values is taken to obtain the current degree of dirty dust filter.

In step 20 of the embodiment, the filter function corresponding to the dirty plugging degree of the dust filter at the current fan speed is calculated by using a first function relationship between the dirty plugging degree of the dust filter net and the pressure difference between the two sides of the filter dust net. The pressure difference on both sides of the net is recorded as the first differential pressure. In this embodiment, the first functional relationship is obtained during the data testing process of the air conditioner, and is already solidified in the air conditioning running program before the air conditioner leaves the factory for convenient query and use. In the data testing process, establishing the first functional relationship includes the following steps:

S601, the fan operating speed range is divided into a plurality of speed ranges according to a preset speed span; the speed span ranges from 30 to 120, and the value is too small, the measured pressure value does not change, and the value is too large. Affecting the accuracy of the final dirty plug detection result, the preferred selection in this embodiment is 50r/min;

S602, when obtaining the first use of the air conditioner, the degree of dirty dust filter corresponding to the rotational speed value at the midpoint of each speed interval and the pressure difference between the two sides of the dust filter are set as the first group of values;

S603, after a preset time, for example, after one year and the dust filter has not been cleaned, the dust filter level corresponding to the rotation speed value at each midpoint of each speed interval and the pressure difference between the two sides of the filter net are obtained again, and the second group is set. Numerical value

S604, according to the first group of values and the second group of values, establish a linear function of the degree of dirty plugging of the dust filter and the pressure difference between the two sides of the filter screen in each speed range. By establishing the linear function, the voltage value can be correspondingly matched with the pressure difference between the two sides of the dust filter under the same dirty plugging degree of the dust filter to ensure the consistency of the dirty plugging degree of the dust filter. By selecting the corresponding first functional relationship formula of the current fan speed, and then bringing in the dirty plugging degree of the dust filter obtained in step 10, the pressure difference ΔPv on both sides of the dust filter net at the current fan speed can be obtained.

In step 30 of this embodiment, the second pressure difference is obtained by a method of setting a pressure sensor. Specifically, the upstream side pressure value of the dust filter corresponding to the current fan speed is obtained by querying a mapping relationship between the windward side pressure value and the fan speed of the pre-established dust filter; and the leeward side pressure of the heat exchanger under the current fan speed is collected by the pressure sensor. And calculating a difference between the pressure value of the leeward side of the heat exchanger and the pressure value of the windward side of the dust filter to generate the second pressure difference. In this embodiment, in order to ensure the accuracy of the pressure value data of the leeward side of the collected heat exchanger, the pressure value of the leeward side of the heat exchanger continuously collected by the pressure sensor may be averaged while maintaining the current fan speed constant. Or, after removing the maximum value and the minimum value, the average value of the leeward side of the heat exchanger is obtained. For example, in this embodiment, the pressure value of the leeward side of the heat exchanger is collected 7 times in succession, and the maximum value and the minimum value are removed, and the remaining value is taken. The average of the five values gives the leeward side pressure value of the heat exchanger. In this embodiment, the mapping relationship table is obtained during the data testing process of the air conditioner, and is already solidified in the air conditioning running program before the air conditioner leaves the factory to facilitate querying and using. In the data testing process, establishing the mapping relationship table includes the following steps:

S701, the fan operating speed range is divided into a plurality of speed ranges according to a preset speed span; the speed span ranges from 30 to 120, and the value is too small, the measured pressure value does not change, and the value is too large. Affecting the accuracy of the final dirty plug detection result, the preferred selection in this embodiment is 50r/min;

S702. Acquire a pressure value of the windward side of the dust filter corresponding to each of the plurality of speed sections, and establish a mapping relationship table. The windward side pressure value of the dust filter is a windward side pressure of the dust filter corresponding to the speed value of the middle point of the speed section. The value, or the average value of the windward side pressure values of the dust filter corresponding to the plurality of rotational speed values equally distributed in the rotational speed interval. With this method, only one pressure sensor is needed, which reduces the detection cost, but the mapping table needs to be established in the data testing process, and the detection step is relatively complicated.

In step 40 of the embodiment, calculating the difference between the second pressure difference ΔP and the first pressure difference ΔPv, the pressure difference ΔPe on both sides of the heat exchanger can be obtained, and the previously established heat exchanger is dirty by querying. The first correspondence table of the plugging level and the fan speed and the pressure difference between the two sides of the heat exchanger obtains the level of the heat exchanger corresponding to the pressure difference ΔPe of the heat exchanger at the current fan speed. In this embodiment, the first correspondence table is obtained during the data testing process of the air conditioner, and is already solidified in the air conditioning running program before the air conditioner leaves the factory to facilitate querying and using. In the data testing process, establishing the first correspondence table includes the following steps:

S801, the fan operating speed range is divided into a plurality of speed ranges according to a preset speed span; the speed span ranges from 30 to 120, and the value is too small, the measured pressure value does not change, and the value is too large. Affecting the accuracy of the final dirty plug detection result, the preferred selection in this embodiment is 50r/min;

S802, when obtaining the first use of the air conditioner, the pressure difference between the two sides of the heat exchanger corresponding to the rotation speed value at the midpoint of each speed interval is set to a first value;

S803, after a preset time, for example, after eight years and the heat exchanger has not been cleaned, the pressure difference between the two sides of the heat exchanger corresponding to the rotation speed value at each mid-point of the speed range is obtained again, and the heat exchangers are The side pressure difference is set to a second value; the first value and the second value form a value range of the pressure difference between the two sides of the heat exchanger corresponding to the speed range;

S804, the value range of the pressure difference on both sides of the heat exchanger is equally divided according to the preset number of dirty plugging levels, and the sides of the heat exchanger corresponding to the dirty plugging level of each heat exchanger are obtained under the speed range. The pressure difference range. In this embodiment, the number of the equal divisions can be arbitrarily selected according to requirements, and only a certain span of the pressure difference in each dirty plugging level can be satisfied. For example, in the embodiment, the pressure difference range is equally divided into four small segments. Range, each small range corresponds to a dust filter level of dust filter, which is divided into 4 levels.

When the heat exchanger is dirty and the level is z3, the dirty plug level is displayed through the display panel, and the buzzer is used to make a buzzer or intelligent voice in a short-time sounding when the air conditioner is turned on and/or running. Prompt, the driving cleaning unit adopts the corresponding cleaning method for automatic cleaning;

When the heat exchanger is dirty and the level is z4, the dirty plug level is displayed through the display panel, and the buzzer is used to make a buzzer or a smart voice prompt in a short time and multiple times when the air conditioner is turned on and/or running. And controlling the air conditioner to stop running; in the control mode, the higher the dirty plugging level, the more serious the heat exchanger is dirty. In a specific embodiment, the buzzer prompt or the smart voice prompt time can be set in the non-sleep time, and the The user is informed of the quality of sleep.

As shown in FIG. 9 , a schematic structural diagram of a heat exchanger dirty block detecting system corresponding to the method of the embodiment 5 includes a first acquiring module, a second acquiring module, a third acquiring module, a calculating module, and a fourth acquiring module.

The third acquiring module is configured to collect a pressure value of the leeward side of the heat exchanger under the current fan speed, and calculate a difference between the pressure value of the leeward side of the heat exchanger and the pressure value of the windward side of the dust filter corresponding to the current fan speed. , generating a second pressure difference;

In this embodiment, the first acquiring module includes a wind speed collecting unit for collecting the fan speed and a dust filter dirty detecting unit for acquiring the dirty plugging degree of the dust filter. As shown in FIG. 10, it is a schematic structural diagram of a dirty filter detecting unit of the dust filter in the present embodiment. The dust filter detecting unit includes a transmitting and receiving module 9 and a detecting module 8 connected through a connector 6, and the detecting The module 8 comprises a light emitting unit 3 for emitting light to the dust filter net 7 and a light-sensitive element 4 for receiving transmitted light transmitted through the dust filter net 7, the light-emitting unit 9 for controlling the light-emitting unit 3 to emit light and The light intensity of the transmitted light received by the photosensitive member 4 is converted into a numerical value indicating the degree of dirty plugging of the dust filter 7. This implementation For example, the light emitting unit 3 is an infrared light emitting diode; the photosensitive element 4 is a photodiode, and in other embodiments, the photosensitive element 4 may also be a phototransistor. In this embodiment, the transmitting and receiving module 9 includes a single chip microcomputer 1, a first switch control circuit 2, and a conversion circuit for converting a photocurrent of the photodiode into a voltage, and the first IO port of the single chip microcomputer 1 is connected to the first switch. The control circuit 2, the first switch control circuit 2 is connected to the infrared light emitting diode through a connector 6, and the conversion circuit is connected to the analog input port of the single chip microcomputer 1. The conversion circuit includes a resistor R4 connected in series with the photosensitive element. The resistor R4 is connected to the analog input port of the single chip 1 at the same time as the series end of the photosensitive element, and the other end of the resistor R4 is grounded.

In this embodiment, the first IO port of the single-chip microcomputer 1 of the dust filter detecting unit of the dust filter outputs a high-low level signal, and the high-low level signal controls the turn-on and turn-off of the transistor Q1 to energize the infrared light-emitting diode LED, and the LED emits The infrared light passes through the dust filter net, and some of the light cannot pass through the filter dust net due to the reflection, scattering, absorption and the like of the dust attached to the dust filter net 7, so that the transmitted light is reduced, and the more dust adheres, the more The less light there is. The photodiode 4 is a photosensitive element, and the more light is irradiated thereon, the larger the photocurrent passing through it is, and it is connected in series with the resistor R4, and the photocurrent is converted into a voltage by Ohm's law u=ir, and the resistor R4 is collected. The voltage at both ends is transmitted to the single-chip microcomputer, and then the analog voltage signal built in the single-chip microcomputer 1 can be used to convert the analog voltage signal into a digital information value, and this value is used to indicate the dirty plugging degree of the dust filter. In this embodiment, the resistor R4 The greater the voltage at both ends, the larger the value of the digital signal converted into a digital information, indicating that the greater the intensity of the light that is transmitted, the more the dust filter is dirty. slight.

As shown in FIG. 11, it is a schematic structural diagram of a dust filter detecting unit in the sixth embodiment. Compared with FIG. 10, a second switch control circuit 10 for controlling the opening and closing of the photosensitive element is added, and the second switch is controlled. The circuit is connected to the second IO port of the single chip microcomputer, and controls the opening and closing of the second switch control circuit by the high and low level signals corresponding to the output of the IO port. When the dust filter is not detected, the circuit can be reliably turned off. Compared with the unit without the switch control circuit, the light current generated on the transmitting and receiving module when the light is irradiated to the photosensitive element in the non-detecting time environment is avoided. Consumption. In this embodiment, the second switch control circuit 10 is a triode switch circuit, including a triode Q2, a resistor R6 and a resistor R7. The base of the transistor Q2 is connected to the second IO port of the single chip via a resistor R6, and the collector is A resistor R4 is connected to the series terminal of the photosensitive element and resistor R5, and the emitter is grounded. The base of the transistor Q1 is also grounded in series with the pull-down resistor R7. The triode switch circuit is used to turn on the illumination when it needs to be detected, and is turned off when no detection is needed. The control circuit is simple, and the energy consumption can be saved to the utmost.

In the embodiment corresponding to FIG. 10 and FIG. 11 , the first switch control circuit, the second switch control circuit, and the conversion circuit are all integrated in the main control board, and the power control module 5 is further disposed on the main control board, and the power supply module is 5 respectively connecting the infrared light emitting diode and the photodiode for supplying power to the infrared light emitting diode and the photodiode. The power supply module is a five-volt regulated filter power supply. The external device of the dirty filter detecting unit of the dust filter of the invention only includes the light emitting unit and the photosensitive element, and the remaining control circuit parts are arranged on the main control board, and only two connecting lines are needed to realize signal transmission and reception, and then By adding a connection cable to the power supply module, the entire detection scheme can be realized, thereby reducing the connection line, occupying a small space, being easy to implement, and reducing the cost. At the same time, the light emitting unit and the photosensitive element are small in size, which greatly reduces the occupied space, thereby reducing the influence of the external device on the dust attached to the dust filter, and ensuring the accuracy of the detection result. At the same time, the power supply module is simple, no complicated power supply is needed, and only the motherboard 5v can supply power. By connecting a grounded capacitor C1 in parallel with the power supply, the noise interference of the DC power can be removed, making the power supply cleaner and reducing noise.

In the embodiment corresponding to FIG. 10 and FIG. 11, the single chip microcomputer includes an analog to digital converter, and the conversion power The analog input port of the single-chip microcomputer is connected to the analog-to-digital converter, and the analog-to-digital converter converts the voltage analog signal into a digital signal for detecting the obtained light intensity information, so that the dirty plugging degree of the dust filter net can be obtained. This facilitates the information processing and other functions to judge this information. In this embodiment, the output pin of the analog-to-digital converter of the single chip microcomputer is connected to a resistor R5 and then connected to a grounded capacitor C2, which can function as a current limiting and decoupling. In other embodiments, it is also possible to detect the degree of dirty plugging of the dust filter by receiving the light intensity of the reflected light diffused and reflected by the filter dust net, and the structure of the detecting unit and the dust filter dirty detecting unit of Embodiment 5 and Embodiment 6 Basically the same, it is only necessary to replace the photodiode with a photodiode or a phototransistor for receiving reflected light diffusely reflected by the dust filter. In this embodiment, the greater the voltage across the resistor in series with the photodiode or the phototransistor, the greater the value converted by the single-chip microcomputer into digital information, indicating that the greater the reflected light intensity, the more dust and dust on the dust filter net, and the dust filter net. The more serious the dirty blockage.

As shown in FIG. 9 , in the embodiment, the second acquiring module includes: a first storage unit, configured to store a first function of a pre-established degree of dirty plugging of the dust filter and a pressure difference between the two sides of the filter net under different fan speeds. a first calculating unit, configured to bring the dirty plugging degree of the dust filter into the first functional relationship corresponding to the current fan speed, and generate a dirty plugging degree of the dust filter corresponding to the current fan speed. The pressure difference between the two sides of the filter net.

The third obtaining module includes: a pressure sensor disposed on the leeward side of the heat exchanger for continuously collecting the pressure value of the leeward side of the heat exchanger; and a second calculating unit for typhoon side of the plurality of the heat exchangers The pressure value is directly taken as the average value or the maximum value and the minimum value are removed, and the average value is obtained to obtain the leeward side pressure value of the heat exchanger; the second storage unit is used to store the mapping relationship between the windward side pressure value and the fan speed of the pre-established dust filter net. a first query unit, configured to query the mapping relationship table, to obtain a windward side pressure value of the dust filter corresponding to the current fan speed; and a third calculating unit, configured to calculate a pressure value of the leeward side of the heat exchanger and the dust filter net The difference in the pressure on the windward side generates a second pressure difference.

The fourth obtaining module includes: a third storage unit, configured to store a pre-established heat exchanger dirty plugging level and a first wind turbine rotating speed, a first correspondence table between the two sides of the heat exchanger; the second query unit is used Querying the first correspondence table to obtain a pressure difference between the two sides of the heat exchanger corresponding to the current fan speed The heat exchanger is dirty.

FIG. 12 is a schematic flow chart of another method for detecting a dirty block of a heat exchanger based on a single pressure sensor in Embodiment 7, including the following steps:

Step 10: adjust the current fan speed to a preset target fan speed, and obtain a dirty filter dust level under the target fan speed;

Step 20: Obtain a pressure difference between the two sides of the dust filter corresponding to the dirty plugging degree of the dust filter, and record it as the first pressure difference;

Step 30: Collect a pressure value of the leeward side of the heat exchanger under the target fan speed, and calculate a difference between the pressure value of the leeward side of the heat exchanger and the pressure value of the windward side of the dust filter corresponding to the target fan speed to generate a second pressure. difference;

In step 50, the corresponding heat exchanger dirty plugging level is obtained according to the pressure difference between the two sides of the heat exchanger.

In the step 10, the degree of dirty plugging of the dust filter can be directly obtained by the photoelectric detecting method. The specific method is the same as that in the embodiment 5, and will not be described in detail herein. In step 20 of the embodiment, the pressure difference between the filter screen corresponding to the dirty plugging degree of the dust filter is calculated by the second function relationship between the dirty plugging degree of the dust filter and the pressure difference between the two sides of the filter dust. , recorded as the first pressure difference. In this embodiment, the second functional relationship is obtained during the data testing process of the air conditioner, and is already solidified in the air conditioning running program before the air conditioner leaves the factory to facilitate query and use. In the data testing process, establishing the second functional relationship includes the following steps:

S601, when obtaining the first use of the air conditioner, the degree of dirty plugging of the dust filter corresponding to the target fan speed and the pressure difference between the two sides of the filter net are set as the first group value;

S602. After the preset time, obtain the degree of dirty dust filter corresponding to the target fan speed and The pressure difference between the two sides of the dust filter is set to the second set of values;

S603. Establish a linear function of the degree of dirty plugging of the dust filter and the pressure difference between the two sides of the dust filter according to the first set of values and the second set of values. By bringing the degree of dirty dust filter obtained in step 10 into the first functional relationship, the pressure difference ΔPv on both sides of the dust filter at the target fan speed can be obtained.

In the step 30 of the embodiment, the second pressure difference is obtained by the method of setting a pressure sensor. The specific method is similar to that in the embodiment 5, but only the mapping table of the target fan speed can be obtained, and the method is not performed again. Detailed description. In step 40 of the embodiment, calculating the difference between the second pressure difference ΔP and the first pressure difference ΔPv, the pressure difference ΔPe on both sides of the heat exchanger can be obtained, and the target fan speed is established by querying in advance. The second correspondence table of the dirty plugging level of the heat exchanger and the pressure difference between the two sides of the heat exchanger obtains the dirty plugging level of the heat exchanger corresponding to the pressure difference ΔPe on both sides of the heat exchanger. In this embodiment, the second correspondence table is obtained during the data testing process of the air conditioner, and is already solidified in the air conditioning running program before the air conditioner leaves the factory to facilitate querying and using. In the data testing process, establishing the second correspondence table includes the following steps:

S801, when obtaining the first use of the air conditioner, the pressure difference between the two sides of the heat exchanger corresponding to the target fan speed is set to a first value;

S802, after a preset time, for example, after eight years and the heat exchanger has not been cleaned, the pressure difference between the two sides of the heat exchanger corresponding to the target fan speed is obtained again, and the pressure difference between the two sides of the heat exchanger is set to a second value; the first value and the second value form a value range of a pressure difference between the two sides of the heat exchanger corresponding to the target fan speed;

S803, the value range of the pressure difference on both sides of the heat exchanger is equally divided according to the preset number of dirty plugging levels, and the heat exchangers corresponding to the dirty plugging level of each heat exchanger are obtained under the target fan speed. The pressure difference range. In this embodiment, the number of the equal divisions can be arbitrarily selected according to requirements, and only a certain span of the pressure difference in each dirty plugging level can be satisfied. For example, in the embodiment, the pressure difference range is equally divided into four small segments. Range, each small range corresponds to a dust filter level of dust filter, which is divided into 4 levels.

After obtaining the dirty plugging level of the heat exchanger by the dirty plugging detection method of the present invention, different control modes can be adopted for the air conditioner according to the different dirty state of the heat exchanger, and the degree of dirty plugging of the dust filter can be changed according to the dust filter. The heat exchanger is dirty and the dust filter and/or heat exchanger are cleaned separately at different or the same time.

FIG. 13 is a schematic structural diagram of a heat exchanger dirty blocking detection system corresponding to the method in Embodiment 7, including an adjustment module, a first acquisition module, a second acquisition module, a third acquisition module, a calculation module, and a Four acquisition modules,

The third acquiring module is configured to collect a pressure value of the leeward side of the heat exchanger under the target fan speed, and calculate a difference between the pressure value of the leeward side of the heat exchanger and the pressure value of the windward side of the dust filter corresponding to the target fan speed. , generating a second pressure difference;

In this embodiment, the first acquiring module includes a dust filter dirty block detecting unit for acquiring a dirty plugging degree of the dust filter. The specific structure is as shown in the corresponding embodiment of FIG. 3 and FIG. Description. The second obtaining module includes: a first storage unit, configured to pre-establish a second function relationship between a dirty plugging degree of the dust filter net and a pressure difference between the two sides of the dust filter net; and a first calculating unit, The degree of dirty plugging of the dust filter is brought into the second functional relationship, and the pressure difference between the two sides of the dust filter corresponding to the dirty plugging degree of the dust filter is generated.

The third obtaining module includes: a pressure sensor disposed on the leeward side of the heat exchanger for continuously collecting the pressure value of the leeward side of the heat exchanger; and a second calculating unit for typhoon side of the plurality of the heat exchangers The pressure value is directly taken as the average value or the maximum value and the minimum value are removed, and the average value is obtained to obtain the pressure value of the leeward side of the heat exchanger; the second storage unit is used for storing the mapping relationship between the pressure value on the windward side of the pre-established dust filter net and the target fan speed. a first query unit, configured to query the mapping relationship table, to obtain a windward side pressure value of the dust filter corresponding to the target fan speed; and a third calculating unit, configured to calculate a pressure value of the leeward side of the heat exchanger and the dust filter The difference between the pressure values on the windward side of the net generates a second pressure difference.

The fourth obtaining module includes: a third storage unit, configured to store a second correspondence table of the heat exchanger dirty blocking level and the pressure difference between the two sides of the heat exchanger in the pre-established target fan speed; the second query unit The method is configured to query the second correspondence table, and obtain a dirty plugging level of the heat exchanger corresponding to the pressure difference on both sides of the heat exchanger.

FIG. 14 is a schematic structural diagram of an air conditioner according to Embodiment 8, including the above-mentioned single A heat exchanger dirty detection system for pressure sensors.

In the description of the present invention, it is to be understood that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" or "second" may include at least one of the features, either explicitly or implicitly. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless specifically defined otherwise.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means a specific feature described in connection with the embodiment or example. A structure, material or feature is included in at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms is not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, various embodiments or examples described in the specification, as well as features of various embodiments or examples, may be combined and combined.

One of ordinary skill in the art can understand that all or part of the steps carried by the method of implementing the above embodiments can be completed by a program to instruct related hardware, and the program can be stored in a computer readable storage medium. When executed, one or a combination of the steps of the method embodiments is included.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. The integrated modules, if implemented in the form of software functional modules and sold or used as stand-alone products, may also be stored in a computer readable storage medium.

The above mentioned storage medium may be a read only memory, a magnetic disk or an optical disk or the like.

Although the embodiments of the present invention have been shown and described, it is understood that the above-described embodiments are illustrative and are not to be construed as limiting the scope of the invention. The embodiments are subject to variations, modifications, substitutions and variations.

Claims

A method for detecting a dirty blockage of an air conditioner heat exchanger, comprising the steps of:

Step 1: obtaining a dirty plugging degree of the dust filter under the first fan speed;

Step 2: Obtain a pressure difference between the two sides of the dust filter corresponding to the dirty plugging degree of the dust filter under the first fan speed, and record the first pressure difference;

Step 3: Obtain a difference between the pressure of the leeward side of the heat exchanger and the pressure on the windward side of the dust filter under the first fan speed, and record the difference as the second pressure difference;

Step 4, calculating a difference between the second pressure difference and the first pressure difference to generate a pressure difference on both sides of the heat exchanger;

In step 5, the corresponding heat exchanger dirty plugging level is obtained according to the pressure difference between the two sides of the heat exchanger and the first fan speed.
The method for detecting a dirty blockage of an air conditioner heat exchanger according to claim 1, further comprising a step 6, specifically: adopting different control modes for the air conditioner according to different heat exchanger dirty plugging levels; and/or according to the dust filter The dirty plugging degree of the net and the dirty plugging level of the heat exchanger are cleaned by the corresponding cleaning method for the dust filter net and/or the heat exchanger respectively.
The method for detecting a dirty blockage of an air-conditioning heat exchanger according to claim 2, wherein in the step 1, the degree of dirty plugging of the dust filter is obtained by using a photoelectric detecting method, which specifically comprises the following steps:

Controlling the light emitting unit to illuminate the dust filter net;

Controlling the photosensitive element to receive transmitted light transmitted through the dust filter net or receiving reflected light diffusely reflected by the filter dust net;

The light intensity of the transmitted or reflected light received by the photosensitive element is converted to a value indicative of the degree of dirty plugging of the dust filter; the value is the voltage value of the electrical resistance in series with the photosensitive element.
The method for detecting a dirty blockage of an air conditioner heat exchanger according to claim 3, wherein the step 3 is specifically:

Keeping the first fan speed unchanged, continuously collecting the pressure value of the leeward side of the heat exchanger through the first pressure sensor, continuously collecting the pressure value on the windward side of the dust filter through the second pressure sensor, and calculating the difference between the two;

The second pressure difference is obtained by taking the average value directly or removing the maximum value and the minimum value and taking the average value.
The method for detecting a dirty block of an air conditioner heat exchanger according to any one of claims 1 to 4, wherein the first fan speed is a current fan speed or a preset target fan speed.
The method for detecting a dirty blockage of an air conditioner heat exchanger according to claim 5, wherein when the first fan speed is the current fan speed, in step 2, the dirty filter net is blocked by the pre-established different fan speeds. A first functional relationship between the pressure difference between the two sides of the dust filter is calculated, and the pressure difference between the dust filter and the corresponding dust filter is calculated. The first functional relationship is established by the following steps:

The fan operable speed range is divided into a plurality of speed intervals according to a preset speed span; the speed span is 30-120r/min;

When obtaining the first use of the air conditioner, the degree of dirty dust filter corresponding to the speed value at the midpoint of each speed interval and the pressure difference between the two sides of the filter net are set to the first group of values;

After the preset time, the dampness level of the dust filter corresponding to the rotation speed value at the midpoint of each speed interval and the pressure difference between the two sides of the filter net are obtained again, and the second group value is set;

According to the first set of values and the second set of values, a linear function of the dirty plugging degree of the dust filter and the pressure difference between the two sides of the filter dust net is established in each speed range.
The method for detecting a dirty blockage of an air-conditioning heat exchanger according to claim 6, wherein in step 5, the first correspondence of the pre-established heat exchanger dirty plug level and the fan speed and the pressure difference between the two sides of the heat exchanger is queried. The relationship table obtains a heat exchanger dirty plugging level corresponding to the pressure difference between the two sides of the heat exchanger at the current fan speed, wherein the establishing the first correspondence table includes the following steps:

The fan operable speed range is divided into a plurality of speed intervals according to a preset speed span; the speed span is 30-120r/min;

When obtaining the first use of the air conditioner, the pressure difference between the two sides of the heat exchanger corresponding to the speed value at the midpoint of each speed interval is set to the first value;

After the preset time, the sides of the heat exchanger corresponding to the speed value at the midpoint of each speed interval are acquired again. a pressure difference, and the pressure difference between the two sides of the heat exchanger is set to a second value; the first value and the second value form a value range of the pressure difference between the two sides of the heat exchanger corresponding to the speed range;

The value range of the pressure difference on both sides of the heat exchanger is equally divided according to the preset number of dirty plugging levels, and the pressure difference between the heat exchangers corresponding to the dirty plugging level of each heat exchanger is obtained under the speed range. range.
The method for detecting a dirty blockage of an air conditioner heat exchanger according to claim 5, wherein when the first fan speed is the target fan speed, in step 2, the dust filter net is blocked by the pre-established target fan speed. Calculating a pressure difference between the two sides of the dust filter corresponding to the degree of dirty plugging of the dust filter, and calculating the second function relationship includes the following steps:

When the air conditioner is used for the first time, the degree of dirty dust of the dust filter corresponding to the target fan speed and the pressure difference between the two sides of the filter are set to the first group of values;

After the preset time, the dampage degree of the dust filter corresponding to the target fan speed and the pressure difference between the two sides of the filter net are obtained again, and the second group value is set;

According to the first set of values and the second set of values, a linear function of the degree of dirty plugging of the filter dust and the pressure difference between the two sides of the filter dust is established under the target fan speed.
The method for detecting a dirty blockage of an air conditioner heat exchanger according to claim 8, wherein in step 5, the second step of the differential pressure of the heat exchanger and the pressure difference between the two sides of the heat exchanger are queried by querying the pre-established target fan speed. Corresponding relationship table, obtaining a heat exchanger dirty plugging level corresponding to the pressure difference on both sides of the heat exchanger, wherein the establishing the second correspondence table comprises the following steps:

When the air conditioner is used for the first time, the pressure difference between the two sides of the heat exchanger corresponding to the target fan speed is set to a first value;

After the preset time, the pressure difference between the two sides of the heat exchanger corresponding to the target fan speed is obtained again, and is set to a second value;

The first value and the second value form a value range of a pressure difference between the two sides of the heat exchanger corresponding to the target fan speed;

The value range of the pressure difference on both sides of the heat exchanger is equally divided according to the preset number of dirty plugging levels, and the pressure difference between the heat exchangers corresponding to the dirty plugging level of each heat exchanger is obtained under the target fan speed. range.
An air conditioning heat exchanger dirty block detection system, comprising: a first acquisition module, a second acquisition module, a third acquisition module, a calculation module, and a fourth acquisition module,

The first obtaining module is configured to acquire a dirty plugging degree of the dust filter under the first fan speed;

The second acquiring module is configured to obtain a pressure difference between the two sides of the dust filter corresponding to the dirty plugging degree of the dust filter under the first fan speed, and record the first pressure difference;

The third obtaining module is configured to obtain a difference between the leeward side pressure of the heat exchanger and the windward side pressure of the dust filter under the first fan speed, which is recorded as a second pressure difference;

The calculating module is configured to calculate a difference between the second pressure difference and the first pressure difference, and generate a pressure difference on both sides of the heat exchanger;

The fourth acquiring module is configured to obtain a corresponding heat exchanger dirty blocking level according to the pressure difference between the two sides of the heat exchanger and the first fan speed.
The air conditioner heat exchanger dirty block detecting system according to claim 10, further comprising a control module, wherein the control module is configured to adopt different control modes for the air conditioner according to different heat exchanger dirty plugging levels; and / Or according to the dirty plugging degree of the dust filter and the dirty plugging level of the heat exchanger, the dust filter net and/or the heat exchanger are cleaned separately according to the cleaning method.
The air conditioning heat exchanger dirty block detection system according to claim 11, wherein the first acquisition module comprises a dust filter dirty block detecting unit for acquiring a dust filter network dirty block degree; and the dust filter net dirty block detecting device The unit includes a transmitting and receiving unit and a detecting unit connected by a connector, the detecting unit including a light emitting unit for emitting light to the dust filter net and a reflected light for receiving the transmitted light through the dust filter net or diffusely reflected by the filter dust net The light-receiving element is configured to control the light-emitting unit to emit light and to convert the light intensity of the transmitted light or the reflected light received by the light-sensitive element into a value for indicating the degree of dirty plugging of the dust filter.
The air conditioner heat exchanger dirty block detecting system according to any one of claims 10 to 12, wherein the first fan speed is a current fan speed or a preset target fan speed.
The air conditioning heat exchanger dirty block detection system according to claim 13, wherein the second acquisition module comprises:

The first storage unit is configured to store a first function relationship between the degree of dirty plugging of the dust filter and the pressure difference between the two sides of the filter net under different fan speeds established in advance; or to store the degree of dirty dust filter of the pre-established target fan speed a second functional relationship with the pressure difference across the filter screen;

a first calculating unit, configured to bring the degree of dirty plugging of the dust filter into the first functional relationship corresponding to the current fan speed, and generate a dust filter corresponding to the current fan speed The side pressure difference is used; or the degree of dirty plugging of the dust filter net is brought into the second functional relationship, and the pressure difference between the two sides of the dust filter net corresponding to the dirty plugging degree of the dust filter net is generated at the target fan speed.
The air conditioning heat exchanger dirty block detecting system according to claim 13, wherein the third obtaining module comprises:

a first pressure sensor disposed on the leeward side of the heat exchanger for continuously collecting pressure on the leeward side of the heat exchanger;

a second pressure sensor disposed on the windward side of the dust filter for continuously collecting the pressure on the windward side of the dust filter;

a second calculating unit, configured to calculate a difference between a pressure on the leeward side of the heat exchanger and a pressure on the windward side of the dust filter, and take the average value directly or remove the maximum value and the minimum value to obtain the second pressure difference .
The air conditioning heat exchanger dirty block detecting system according to claim 13, wherein the fourth obtaining module comprises:

a second storage unit, configured to store a pre-established heat exchanger dirty plugging level and a fan speed, a first two correspondence table of pressure differences between the two sides of the heat exchanger; or for storing the pre-established target fan speed a second correspondence table of the dirty block level of the heat exchanger and the pressure difference between the two sides of the heat exchanger;

a query unit, configured to query the first correspondence table, obtain a heat exchanger dirty level corresponding to a pressure difference between the two sides of the heat exchanger at a current fan speed, or query the second correspondence table, Obtaining a heat exchanger dirty plugging level corresponding to a pressure difference between the two sides of the heat exchanger at a target fan speed.
An air conditioner comprising the air conditioning heat exchanger dirty plugging detection system according to any one of claims 10 to 16.
A heat exchanger dirty block detecting method based on a single pressure sensor, characterized in that Next steps:

Step 10: obtaining a dirty plugging degree of the dust filter under the first fan speed;

Step 20: Obtain a pressure difference between the two sides of the dust filter corresponding to the dirty plugging degree of the dust filter under the first fan speed, and record the first pressure difference;

Step 30: collecting a pressure value of the leeward side of the heat exchanger at the first fan speed, and calculating a difference between the pressure value of the leeward side of the heat exchanger and the pressure value of the windward side of the dust filter corresponding to the first fan speed, to generate a Two pressure difference;

Step 40, calculating a difference between the second pressure difference and the first pressure difference to generate a pressure difference on both sides of the heat exchanger;

Step 50: Obtain a corresponding heat exchanger dirty plugging level according to the pressure difference between the two sides of the heat exchanger and the first fan speed.
The method for detecting a dirty block of a heat exchanger based on a single pressure sensor according to claim 18, further comprising a step 60, specifically: adopting different control modes for the air conditioner according to different levels of dirty heat exchangers; / According to the dirty plugging degree of the dust filter and the dirty plugging level of the heat exchanger, the dust filter net and/or the heat exchanger are cleaned separately according to the cleaning method.
The method for detecting a dirty blockage of a heat exchanger based on a single pressure sensor according to claim 19, wherein in the step 10, the degree of dirty plugging of the dust filter is obtained by using a photoelectric detecting method, which specifically comprises the following steps:

Controlling the light emitting unit to illuminate the dust filter net;

Controlling the photosensitive element to receive transmitted light transmitted through the dust filter net or receiving reflected light diffusely reflected by the filter dust net;

The light intensity of the transmitted or reflected light received by the photosensitive element is converted to a value indicative of the degree of dirty plugging of the dust filter; the value is the voltage value of the electrical resistance in series with the photosensitive element.
The method for detecting a dirty block of a heat exchanger based on a single pressure sensor according to claim 19, wherein the step 30 is specifically:

Maintaining the first fan speed unchanged, taking the average value of the pressure value of the leeward side of the heat exchanger continuously collected by the pressure sensor or removing the maximum value and the minimum value, and taking the average value to obtain the leeward side pressure value of the heat exchanger;

Query the mapping relationship between the pre-established fan speed and the windward side pressure value of the dust filter, and obtain the windward side pressure value of the dust filter corresponding to the first fan speed;

Calculating a difference between a pressure value of the leeward side of the heat exchanger and a pressure value of the windward side of the dust filter to generate a second pressure difference.
The method for detecting a dirty block of a heat exchanger based on a single pressure sensor according to any one of claims 18 to 21, wherein the first fan speed is a current fan speed or a preset target fan speed.
The method for detecting a dirty block of a heat exchanger based on a single pressure sensor according to claim 22, wherein when the first fan speed is the current fan speed, in step 20, the filter dust is dirty through the pre-established different fan speeds. a first functional relationship between the degree of plugging and the pressure difference between the two sides of the dust filter net, and calculating a pressure difference between the dust filter net and the corresponding dust filter net at the current fan speed, wherein the establishing the first functional relationship includes the following steps :

The fan operable speed range is divided into a plurality of speed intervals according to a preset speed span; the speed span is 30-120r/min;

When obtaining the first use of the air conditioner, the degree of dirty dust filter corresponding to the speed value at the midpoint of each speed interval and the pressure difference between the two sides of the filter net are set to the first group of values;

After the preset time, the dampness level of the dust filter corresponding to the rotation speed value at the midpoint of each speed interval and the pressure difference between the two sides of the filter net are obtained again, and the second group value is set;

According to the first set of values and the second set of values, a linear function of the dirty plugging degree of the dust filter and the pressure difference between the two sides of the filter dust net is established in each speed range.
The method for detecting a dirty block of a heat exchanger based on a single pressure sensor according to claim 23, wherein in step 50, the pre-established heat exchanger dirty block level and the fan speed and the pressure difference between the two sides of the heat exchanger are queried. The first correspondence table obtains a heat exchanger dirty plugging level corresponding to the pressure difference between the two sides of the heat exchanger at the current fan speed, wherein the establishing the first correspondence table includes the following steps:

The fan operable speed range is divided into a plurality of speed intervals according to a preset speed span; the speed span is 30-120r/min;

When obtaining the first use of the air conditioner, the pressure difference between the two sides of the heat exchanger corresponding to the speed value at the midpoint of each speed interval is set to the first value;

After the preset time, the pressure difference between the two sides of the heat exchanger corresponding to the speed value at the midpoint of each speed interval is obtained again, and the pressure difference between the two sides of the heat exchanger is set to a second value; The second value forms a value range of the pressure difference between the two sides of the heat exchanger corresponding to the rotation speed interval;

The value range of the pressure difference on both sides of the heat exchanger is equally divided according to the preset number of dirty plugging levels, and the pressure difference between the heat exchangers corresponding to the dirty plugging level of each heat exchanger is obtained under the speed range. range.
The method for detecting a dirty block of a heat exchanger based on a single pressure sensor according to claim 22, wherein when the first fan speed is a preset target fan speed, in step 20, the pre-established target fan speed is used. A second functional relationship between the degree of dirty plugging of the dust filter and the pressure difference between the two sides of the dust filter is calculated, and the pressure difference between the two sides of the dust filter corresponding to the dirty plugging degree of the dust filter is calculated, wherein the establishing the second function relationship includes the following steps:

When the air conditioner is used for the first time, the degree of dirty dust of the dust filter corresponding to the target fan speed and the pressure difference between the two sides of the filter are set to the first group of values;

After the preset time, the dampage degree of the dust filter corresponding to the target fan speed and the pressure difference between the two sides of the filter net are obtained again, and the second group value is set;

According to the first set of values and the second set of values, a linear function of the degree of dirty plugging of the filter dust and the pressure difference between the two sides of the filter dust is established under the target fan speed.
The method for detecting a dirty block of a heat exchanger based on a single pressure sensor according to claim 25, wherein in step 50, the dirty plugging level of the heat exchanger and the pressure on both sides of the heat exchanger are queried by querying the pre-established target fan speed. The second correspondence table of the difference is obtained, and the dirty plugging level of the heat exchanger corresponding to the pressure difference on both sides of the heat exchanger is obtained, wherein the establishing the second correspondence table comprises the following steps:

When the air conditioner is used for the first time, the pressure difference between the two sides of the heat exchanger corresponding to the target fan speed is set to a first value;

After the preset time, the pressure difference between the two sides of the heat exchanger corresponding to the target fan speed is obtained again, and is set to a second value;

The first value and the second value form a value range of a pressure difference between the two sides of the heat exchanger corresponding to the target fan speed;

The value range of the pressure difference on both sides of the heat exchanger is equally divided according to the preset number of dirty plugging levels, and the pressure difference between the heat exchangers corresponding to the dirty plugging level of each heat exchanger is obtained under the target fan speed. range.
A heat exchanger dirty block detection system based on a single pressure sensor, comprising: a first acquisition module, a second acquisition module, a third acquisition module, a calculation module, and a fourth acquisition module,

The first obtaining module is configured to acquire a dirty plugging degree of the dust filter under the first fan speed;

The second acquiring module is configured to obtain a pressure difference between the two sides of the dust filter corresponding to the dirty plugging degree of the dust filter under the first fan speed, and record the first pressure difference;

The third acquiring module is configured to collect a pressure value of the leeward side of the heat exchanger at the first fan speed, and calculate a pressure value of the leeward side of the heat exchanger and a pressure value of the windward side of the dust filter corresponding to the first fan speed a difference, generating a second pressure difference;

The calculating module is configured to calculate a difference between the second pressure difference and the first pressure difference, and generate a pressure difference on both sides of the heat exchanger;

The fourth acquiring module is configured to obtain a corresponding heat exchanger dirty blocking level according to the pressure difference between the two sides of the heat exchanger and the first fan speed.
The heat exchanger dirty block detecting system based on a single pressure sensor according to claim 27, further comprising a control module, wherein the control module is configured to adopt different control on the air conditioner according to different heat exchanger dirty plugging levels. And; or according to the degree of dirty plugging of the dust filter and the dirty plugging level of the heat exchanger, the dust filter net and/or the heat exchanger are respectively cleaned by corresponding cleaning methods.
The heat exchanger dirty block detecting system based on a single pressure sensor according to claim 27 or 28, wherein the first obtaining module comprises a dust filter dirty plug detecting unit for acquiring a dirty plugging degree of the dust filter; The dust filter dirty detection unit comprises a transmitting and receiving unit and a detecting unit connected by a connector, the detecting unit comprising a light emitting unit for emitting light to the dust filter net and transmitting light or filtering dust for receiving the dust filtering net a light-reflecting light-reflecting light-sensitive element for controlling light emission of the light-emitting unit and transmitted light for receiving the light-sensitive element or The light intensity of the reflected light is converted to a value indicating the degree of dirty plugging of the dust filter.
The heat exchanger dirty block detecting system based on a single pressure sensor according to any one of claims 27 to 29, wherein the first fan speed is a current fan speed or a preset target fan speed.
The single pressure sensor based heat exchanger dirty block detection system according to claim 30, wherein the second acquisition module comprises:

The first storage unit is configured to store a first function relationship between the degree of dirty plugging of the dust filter and the pressure difference between the two sides of the filter net under different fan speeds established in advance; or to store the degree of dirty dust filter of the pre-established target fan speed a second functional relationship with the pressure difference across the filter screen;

a first calculating unit, configured to bring the degree of dirty plugging of the dust filter into the first functional relationship corresponding to the current fan speed, and generate a dust filter corresponding to the current fan speed The side pressure difference is used; or the degree of dirty plugging of the dust filter net is brought into the second functional relationship, and the pressure difference between the dust filter net and the corresponding dust filter net at the target fan speed is generated.
The single pressure sensor-based heat exchanger dirty block detection system according to claim 30, wherein the third acquisition module comprises:

a pressure sensor disposed on the leeward side of the heat exchanger for continuously collecting the pressure value of the leeward side of the heat exchanger;

a second calculating unit, configured to obtain an average value of the pressure values on the leeward side of the plurality of heat exchangers or to remove the maximum value and the minimum value, and obtain an average value to obtain a pressure value of the leeward side of the heat exchanger;

a second storage unit, configured to store a mapping relationship between a pre-established filter screen side wind pressure value and a fan speed;

a first query unit, configured to query the mapping relationship table, and obtain a windward side pressure value of the dust filter corresponding to the current fan speed;

The third calculating unit is configured to calculate a difference between the leeward side pressure value of the heat exchanger and the windward side pressure value of the dust filter to generate a second pressure difference.
The heat exchanger dirty block detecting system based on a single pressure sensor according to claim 30, wherein the fourth obtaining module comprises:

a third storage unit, configured to store a pre-established heat exchanger dirty plugging level and a first corresponding relationship table of different fan speeds and pressure differences on both sides of the heat exchanger; or for storing the pre-established target fan speed a second correspondence table of the dirty block level of the heat exchanger and the pressure difference between the two sides of the heat exchanger;

a second query unit, configured to query the first correspondence relationship table, obtain a heat exchanger dirty plugging level corresponding to a pressure difference between the two sides of the heat exchanger at a current fan speed, or query the second corresponding relationship The table obtains the dirty plugging level of the heat exchanger corresponding to the pressure difference between the two sides of the heat exchanger at the target fan speed.
An air conditioner comprising the heat exchanger dirty block detecting system based on a single pressure sensor according to any one of claims 27 to 33.