Detection method and detection system

Abstract

The detection method and the detection system are applied to clothes processing equipment with a heat pump type drying module, the heat pump type drying module comprises a compressor, a condenser, a throttling mechanism and an evaporator which are sequentially connected to form a heating loop, and a foreign matter filter is arranged in an air duct of the condenser and / or the evaporator. The detection method comprises the following steps: judging whether the foreign matter filter is blocked or judging whether the clothes treatment equipment is in a clothes over-drying state or not according to the rotating speed fluctuation quantity of the compressor; through the mode, the blocking condition and the clothes drying condition are judged by detecting the actual operation state of the compressor, serious noise and damage to the compressor caused by the fact that thread scraps block an air duct are prevented, liquid impact of the compressor caused by liquid refrigerant entering the compressor and cylinder score caused by poor lubrication are avoided, meanwhile, clothes drying is accurately judged, and the clothes drying efficiency is improved. The drying time is shortened. The detection structure is simplified, the application range of the detection method is enlarged, and the applicability is improved.

Description

Technical Field

[0001] The present invention relates to the field of drying detection, and in particular to a detection method and a detection system. Background Art

[0002] Existing clothing processing equipment with a heat pump drying module, such as a heat pump dryer, usually has a foreign body filter, such as a lint filter, to prevent lint from the clothes from entering the air duct during the drying process and clogging the heat exchanger channel (evaporator and condenser). However, as the drying time accumulates, the lint that falls from the clothes will slowly accumulate on the lint filter, causing the air duct of the evaporator or condenser to be blocked, the drying efficiency to decrease, the drying time to increase, and the clothes not to be dried. If the lint filter is not cleaned for a long time, the air duct will be seriously blocked, and it may even cause the compressor to continue to run at a low speed, resulting in insufficient pump oil, poor lubrication and cylinder scuffing, or the evaporator temperature is too high, the refrigerant in the evaporator is not fully vaporized, and the liquid refrigerant enters the compressor, causing compressor liquid hammer, making noise and damaging the compressor.

[0003] To prevent compressor lubrication problems or compressor liquid hammer, current heat pump dryers often detect lint blockage by measuring the operating power or current of the fan motor in the air duct, or by measuring the inlet and outlet air temperatures. Alternatively, they require users to clean lint at fixed intervals through instructions or labels, or by recording the drying time and notifying users to clean after the preset drying time has been reached. This reminds users to clean the lint filter in a timely manner. This can easily lead to untimely reminders, frequent reminders, or ineffective reminders. Summary of the Invention

[0004] In response to the above problems, the present invention provides a detection method and a detection system, which can at least solve some of the problems in the prior art.

[0005] A first aspect of the present invention provides a detection method, which is applied to a clothing processing device having a heat pump drying module. The heat pump drying module includes a compressor, a condenser, a throttling mechanism and an evaporator connected in sequence to form a heating circuit. A foreign matter filter is provided in the air duct of the condenser and / or the evaporator. The detection method includes the following steps: judging whether the foreign matter filter is blocked or judging whether the clothing processing device is in an over-drying state of the clothes based on the speed fluctuation of the compressor.

[0006] In the above manner, the actual operating status of the compressor is detected to determine the blockage condition of the foreign matter filter in the air duct, to prevent lint from clogging the air duct and causing serious noise and damage to the compressor, and to prevent liquid refrigerant from entering the compressor and causing compressor liquid hammer and poor lubrication and causing cylinder pulling. At the same time, using the operating status of the compressor as a condition to judge the drying condition of clothes is conducive to accurately judging the drying of clothes, reducing the drying time, and preventing the drying time reserved for the clothes processing equipment from being too long, causing compressor liquid hammer to generate noise and damage to the compressor. The present invention does not require the provision of an independent variable frequency motor or temperature sensor, simplifies the structure, increases the scope of application of the detection method, and improves its applicability. At the same time, compared with the existing timed reminders, the detection method of the present invention can avoid frequent reminders that cause inconvenience to the user.

[0007] Optionally, the detection method includes: an initial detection step, performing cloth amount detection and / or humidity detection on the clothing processing device when drying starts; a conditional detection step, when the speed fluctuation of the compressor is greater than a preset threshold, performing cloth amount detection and / or humidity detection on the clothing processing device again; a judgment step, if the cloth amount detected in the initial detection step divided by the cloth amount detected in the conditional detection step is less than a preset value, and / or the humidity detected in the conditional detection step is greater than a preset humidity, it is judged that the foreign matter filter is blocked; otherwise, it is judged that the foreign matter filter is not blocked, and it is judged that the clothing processing device is in an over-drying state.

[0008] Through the above method, based on the change in compressor speed fluctuation, the cloth amount and / or humidity are measured twice. The two test results are compared. When the cloth amount does not change much and / or the clothes are very wet, the air volume in the air duct is too low, and the foreign matter filter is determined to be clogged, prompting the user to clean the foreign matter filter to prevent insufficiently vaporized refrigerant from entering the compressor and causing liquid hammer in the compressor. At the same time, the cloth amount and / or humidity are measured when the compressor speed fluctuation suddenly increases, and the results are compared with the test results at the beginning of the drying process. The compressor speed fluctuation is added as a condition when determining whether the clothes are dry. This further improves the accuracy of the clothes drying judgment, reduces the drying time, and prevents the excessive drying time reserved for the clothes processing equipment, which may cause compressor liquid hammer to generate noise and damage the compressor.

[0009] Optionally, in the judging step, when the clothing processing device is in the care process, it is not judged whether the clothing processing device is in the clothing over-drying state.

[0010] By using the above method, it is possible to avoid mistaking the clothing care cycle for the drying cycle to determine whether the clothing is dried, which is beneficial to reduce the number of false detections and further improve the accuracy of the detection results.

[0011] Optionally, in the condition detection step, when the speed fluctuation of the compressor is greater than a preset threshold, the compressor is stopped to relieve the pressure of the heat pump system of the clothing processing equipment.

[0012] Through the above methods, the compressor can be prevented from running continuously at low speed, and the refrigerant in the evaporator can be prevented from being fully vaporized, causing liquid hammer in the compressor.

[0013] Optionally, the condition detection step also includes: if the speed fluctuation of the compressor during the operating cycle is greater than a preset threshold more than a preset number of times within a preset time, a judgment step is performed based on the results of the corresponding multiple cloth amount detections and / or humidity detections.

[0014] Through the above method, when the compressor has multiple consecutive large speed fluctuations, the blockage status of the foreign matter filter can be judged using multiple detection results, which reduces the probability of false detection and is conducive to improving the accuracy of the blockage judgment result.

[0015] Optionally, the method further includes: a compressor detection step, detecting the rotation speed of the compressor in real time, and calculating the corresponding rotation speed fluctuation amount based on the rotation speed.

[0016] By using the above method, the speed of the compressor is monitored in real time and the speed fluctuation is calculated, which is conducive to real-time judgment on whether the foreign matter filter is blocked and to improve the detection accuracy.

[0017] Optionally, the compressor detection step includes: collecting multiple speeds of the compressor within a preset time according to a collection period; calculating the average of the multiple speeds and the sum of the squares of the speed and the average, and obtaining the root mean square error based on the sum of squares and the number of speeds collected within the preset time to represent the speed fluctuation.

[0018] Through the above method, the root mean square error of the speed is calculated using the speed of the compressor, and the root mean square error is used as the fluctuation amount of the speed to judge the real-time operating status of the compressor, thereby improving the accuracy of detecting the real-time operating status of the compressor.

[0019] A second aspect of the present invention provides a detection system, which is applied to a clothing processing device with a heat pump drying module. The heat pump drying module includes a compressor, a condenser, a throttling mechanism and an evaporator connected in sequence to form a heating circuit. A foreign matter filter is provided in the air duct of the condenser and / or the evaporator, including: a speed detection module for detecting the speed fluctuation of the compressor; a judgment module for judging whether the foreign matter filter is blocked or whether the clothing processing device is in an over-drying state of the clothes based on the speed fluctuation.

[0020] Through this approach, the detection system can monitor the compressor's actual operating status to determine the blockage of the foreign matter filter in the air duct, preventing lint from clogging the duct and causing excessive noise and damage to the compressor. Furthermore, using the compressor's operating status as a criterion for determining the drying status of clothes facilitates accurate evaluation of drying conditions, reduces drying time, and prevents excessive drying time reserved for laundry treatment equipment, which can lead to compressor noise and damage caused by compressor hydraulic shock. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the compressor speed of the clothes processing device in an embodiment of the present invention.

[0022] Figure 2 Flowchart of the detection method in an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] <First embodiment>

[0025] Figure 1 Schematic diagram of the compressor speed of the laundry processing device in the embodiment of the present invention. Figure 1 As shown, the first embodiment of the present invention provides a detection method, which is applied to a clothing processing device with a heat pump drying module, such as a heat pump dryer or a clothes dryer. The heat pump drying module includes a compressor, a condenser, a throttling mechanism and an evaporator which are connected in sequence to form a heating circuit. A foreign matter filter is provided in the air duct of the condenser and / or the evaporator to filter impurities such as lint raised during the drying process of the clothes. The detection method includes the following steps: judging whether the foreign matter filter is blocked or judging whether the clothing processing device is in a state where the clothes are over-dried based on the speed fluctuation of the compressor. Specifically: when the speed fluctuation of the compressor is large, it is judged whether the foreign matter filter is blocked or whether the clothing processing device is in a state where the clothes are over-dried; when the speed fluctuation is small, no blockage judgment is made.

[0026] The principle of blockage judgment is as follows: When the foreign matter filter is clogged with lint, the air volume in the air duct decreases, and the amount of hot and humid air entering the evaporator also decreases. In other words, there is not enough hot and humid air entering the evaporator to condense and remove heat, causing the temperature and pressure of the evaporator to increase. At the same time, the temperature of the condenser also rises rapidly. The heat pump drying module adjusts the compressor to reduce its speed. The refrigerant at the evaporator end cannot be quickly withdrawn into the compressor, causing the refrigerant in the evaporator to expand and vaporize. The space is reduced. In other words, the refrigerant in the evaporator cannot be fully vaporized, and some liquid refrigerant enters the compressor, causing liquid hammer in the compressor. At the same time, because the liquid refrigerant cannot be compressed by the compressor, the operating state of the compressor changes drastically, that is, the compressor speed fluctuates violently.

[0027] like Figure 1 As shown, the right half of the compressor speed diagram is the speed when the foreign matter filter is blocked, that is, the compressor speed drops significantly. From the overall compressor speed, the speed fluctuation in the right half is large, and the compressor continues to run at a low speed.

[0028] The principle of drying judgment is as follows: In existing clothing processing equipment, when the foreign matter filter is not blocked by impurities such as lint, and the clothes have been dried, the amount of hot and humid air entering the evaporator will also decrease, that is, there is not enough hot and humid air entering the evaporator to condense and take away heat, causing the temperature and pressure of the evaporator to increase. At the same time, the temperature of the condenser also rises rapidly, and the heat pump drying module adjusts the compressor to reduce its speed. The refrigerant at the evaporator end cannot be quickly withdrawn to the compressor, resulting in the expansion and vaporization space of the refrigerant in the evaporator. In other words, the refrigerant in the evaporator cannot be fully vaporized, and some liquid refrigerant enters the compressor, causing liquid hammer in the compressor. At the same time, since the liquid refrigerant cannot be compressed by the compressor, the operating state of the compressor changes drastically, that is, the speed of the compressor fluctuates drastically.

[0029] Through the above method, the actual operating status of the compressor is detected to determine whether the foreign matter filter in the air duct is blocked, and the lint blockage situation is quantitatively calibrated to prevent lint from blocking the air duct and causing serious noise and damage to the compressor, and to prevent liquid refrigerant from entering the compressor and causing compressor liquid hammer and poor lubrication and causing cylinder pulling. At the same time, using the operating status of the compressor as a condition to judge the drying status of clothes is conducive to accurately judging the drying of clothes, reducing the drying time, and preventing the drying time reserved for the clothes processing equipment from being too long, causing compressor liquid hammer to generate noise and damage to the compressor. Compared with the prior art using fan motor power or current detection, and using air inlet and outlet temperature detection, the embodiment of the present invention does not require the provision of an independent variable frequency fan motor or air inlet temperature sensor, simplifies the structure, expands the scope of application of the detection method, and improves applicability. At the same time, compared with the existing timed reminders for users to clean the foreign matter filter, the detection method of the present invention can avoid frequent reminders that cause inconvenience to users.

[0030] <Second embodiment>

[0031] Figure 2 Flowchart of the detection method in the embodiment of the present invention. Figure 2 The second embodiment of the present invention provides a detection method, which is applied to a clothing processing device having a heat pump drying module. The heat pump drying module has the same composition as the heat pump drying module in the first embodiment and is not repeated here.

[0032] The detection method includes the following initial detection step S1, compressor detection step S2, condition detection step S3 and judgment step S4.

[0033] Initial detection step S1: At the beginning of the drying process, the amount of clothes in the clothes processing device is detected and / or the humidity is detected.

[0034] Compressor detection step S2: Detect the speed of the compressor in real time, and calculate the corresponding speed fluctuation amount according to the speed.

[0035] Condition detection step S3: When the fluctuation amount of the speed of the compressor is greater than a preset threshold, the amount of cloth and / or the humidity of the clothes in the clothes processing device are detected again.

[0036] Determination step S4: If the amount of cloth detected in initial detection step S1 divided by the amount of cloth detected in condition detection step S3 is less than a preset value, and / or the humidity detected in condition detection step S3 is greater than a preset humidity, i.e., the clothes are approaching a wet state, then the foreign matter filter is determined to be clogged. Otherwise, if the clothes are approaching a dry state, the foreign matter filter is determined to be unblocked, and the clothes processing apparatus is determined to be in an over-drying state. The preset value for the amount of cloth and the preset humidity may be within a range.

[0037] It should be noted that the current clothing processing equipment has limited accuracy in detecting the amount of cloth and humidity. Therefore, after the sensor detects that the clothes are dry, a period of drying time will usually be reserved to prevent insufficient drying.

[0038] By monitoring the compressor speed in real time and calculating the speed fluctuation, the above method facilitates real-time judgment on whether the foreign matter filter is clogged. Based on the change in the compressor speed fluctuation, the cloth weight and / or humidity are measured again, and the two measured cloth weight and / or humidity are compared. If the cloth weight does not change much and / or the clothes are relatively wet, i.e., the clothes are not completely dried, it means that the air volume in the air duct is too low. Therefore, the foreign matter filter is judged to be clogged, so as to remind the user to clean the foreign matter filter and prevent the incompletely vaporized refrigerant in the evaporator from entering the compressor and causing liquid hammer in the compressor. At the same time, the cloth weight and / or humidity are measured when the compressor speed fluctuation suddenly increases and compared with the detection result at the beginning of the drying process. By adding the compressor speed fluctuation as a condition when judging whether the clothes are dry, it is convenient to accurately judge whether the clothes are dry, reduce the drying time, and prevent the compressor from being damaged by liquid hammer due to excessive drying time reserved for the clothes processing equipment.

[0039] In addition, the user can manually adjust the drying process after determining that the clothes processing device is in the over-drying state.

[0040] The steps in the second embodiment of the present invention are described in detail below.

[0041] <Compressor Detection Step S2>

[0042] Specifically, compressor detection step S2 includes: collecting multiple compressor speeds within a preset time period according to a collection cycle; calculating the mean of the multiple speeds and the sum of the squares of all speeds and the mean; dividing the sum of the squares by the number of speeds collected within the preset time period; and taking the square root to obtain the root mean square error (RMS) to represent the speed fluctuation. The RMS error represents the degree of dispersion between each data point and the mean; a larger RMS error indicates a greater degree of dispersion between each data point and the mean.

[0043] For example, the actual speed of the compressor is continuously collected within 1 second with a collection period of 10ms, such as X1, X2, X3, ..., X100. The mean X0 of the 100 collected sample values is calculated. Then, the square sum of each value and the mean is calculated, divided by the total number of samples, and the square root is taken to obtain the root mean square error (RMS) as a measurement parameter for the speed fluctuation.

[0044] When the root mean square error of the compressor speed for n consecutive seconds is greater than the preset threshold, it is determined that the foreign matter filter is clogged with lint or the clothes processing device has over-dried clothes, so the condition detection step S3 and the judgment step S4 are continued.

[0045] This method uses the compressor's speed to calculate the root mean square error (RMS) of the speed. This RMS error is then used as a speed fluctuation indicator to determine the compressor's real-time operating status, improving the accuracy of this detection. Furthermore, based on multiple consecutive instances of the RMS error exceeding a preset threshold, the status of the laundry treatment device is determined, further improving the accuracy of the detection method and preventing misjudgments.

[0046] <Condition Detection Step S3>

[0047] In the condition detection step S3 , when the speed fluctuation of the compressor is greater than a preset threshold, the compressor is stopped to release the pressure of the heat pump system of the laundry processing apparatus.

[0048] Through the above methods, the compressor can be prevented from running continuously at a low speed when the thread chips are blocked or the clothes are over-dried, and liquid refrigerant can be prevented from entering the compressor due to insufficient vaporization of the refrigerant, causing liquid hammer, and poor lubrication can be avoided, thereby avoiding damage caused by abnormal operation of the compressor.

[0049] The condition detection step S3 also includes: if the speed fluctuation of the compressor during the operation cycle is greater than the preset threshold more than a preset number of times within the preset time, the judgment step S4 is executed based on the results of the corresponding multiple cloth amount detections and / or humidity detections.

[0050] For example, within one operating cycle, the compressor speed fluctuation is greater than the preset threshold 5 times and greater than the preset number 3 times. Then, the cloth amount and / or humidity results detected in the condition detection step S3 corresponding to the 5 times are compared with the cloth amount and / or humidity results detected in the initial detection step S1 to determine whether the foreign matter filter is blocked.

[0051] Through the above method, when the compressor has multiple consecutive large speed fluctuations, the corresponding multiple detection results are used to judge the blockage status of the foreign matter filter, which reduces the probability of false detection and is conducive to improving the accuracy of the blockage judgment result.

[0052] <Judgment Step S4>

[0053] In the determination step S4 , when the clothes treating apparatus is in the care course, the clothes over-drying determination step S41 is not performed.

[0054] By using the above method, it is possible to avoid mistaking the clothing care cycle for the drying cycle to determine whether the clothing is dried, which is beneficial to reduce the number of false detections and further improve the accuracy of the detection results.

[0055] <Third embodiment>

[0056] A third embodiment of the present invention provides a detection system, which is applied to a clothing processing device with a heat pump drying module. The heat pump drying module includes a compressor, a condenser, a throttling mechanism and an evaporator connected in sequence to form a heating circuit. A foreign matter filter is provided in the air duct of the condenser and / or the evaporator, including: a speed detection module, which is used to detect the speed fluctuation of the compressor; and a judgment module, which is used to judge whether the foreign matter filter is blocked or whether the clothing processing device is in an over-drying state of the clothes based on the speed fluctuation.

[0057] Through this approach, the detection system can monitor the compressor's actual operating status to determine the blockage of the foreign matter filter in the air duct, preventing lint from clogging the duct and causing excessive noise and damage to the compressor. Furthermore, using the compressor's operating status as a criterion for determining the drying status of clothes facilitates accurate evaluation of drying conditions, reduces drying time, and prevents excessive drying time reserved for laundry treatment equipment, which can lead to compressor noise and damage caused by compressor hydraulic shock.

[0058] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A detection method, applied to a clothes processing device having a heat pump drying module, wherein the heat pump drying module comprises a compressor, a condenser, a throttling mechanism, and an evaporator connected in sequence to form a heating circuit, wherein a foreign matter filter is provided in the air duct of the condenser and / or the evaporator, characterized in that: The detection method comprises the following steps: According to the rotation speed fluctuation of the compressor, it is determined whether the foreign matter filter is blocked or whether the clothes processing device is in a clothes over-drying state.

2. The detection method according to claim 1, characterized in that The detection method comprises: an initial detection step, performing a cloth amount detection and / or humidity detection on the clothes processing device at the start of drying; a condition detection step, when the speed fluctuation of the compressor is greater than a preset threshold, performing the cloth amount detection and / or the humidity detection on the clothes processing device again; A judgment step: if the amount of cloth detected in the initial detection step divided by the amount of cloth detected in the condition detection step is less than a preset value, and / or the humidity detected in the condition detection step is greater than a preset humidity, then it is judged that the foreign matter filter is blocked; otherwise, it is judged that the foreign matter filter is not blocked, and it is judged that the clothing processing device is in an over-drying state.

3. The detection method according to claim 2, characterized in that In the determining step, when the clothes treating device is in the care process, it is not determined whether the clothes treating device is in the clothes over-drying state.

4. The detection method according to claim 2, characterized in that In the condition detection step, when the speed fluctuation of the compressor is greater than the preset threshold, the compressor is stopped to relieve pressure in the heat pump system of the laundry processing device.

5. The detection method according to claim 4, characterized in that The condition detection step further includes: If the speed fluctuation of the compressor during the operation cycle is greater than the preset threshold value for more than a preset number of times within the preset time, a judgment step is performed based on the results of the corresponding multiple cloth amount detections and / or humidity detections.

6. The detection method according to claim 2, characterized in that Also includes: The compressor detection step detects the rotation speed of the compressor in real time and calculates the corresponding rotation speed fluctuation amount according to the rotation speed.

7. The detection method according to claim 6, characterized in that The compressor detection step comprises: Collecting multiple rotation speeds of the compressor within a preset time according to a collection cycle; An average of the plurality of rotational speeds and a sum of squares of the rotational speed and the average are calculated, and a root mean square error is obtained based on the sum of squares and the number of rotational speeds collected within the preset time to represent the rotational speed fluctuation.

8. A detection system, applied to a clothes processing device having a heat pump drying module, wherein the heat pump drying module comprises a compressor, a condenser, a throttling mechanism, and an evaporator connected in sequence to form a heating circuit, wherein a foreign matter filter is provided in the air duct of the condenser and / or the evaporator, characterized in that: include: A speed detection module, configured to detect a speed fluctuation of the compressor; The judgment module is used to judge whether the foreign matter filter is blocked or whether the clothes processing device is in a clothes over-drying state according to the speed fluctuation amount.

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