A drying temperature acquisition method, a dryer and a washing-drying integrated machine using the method

Abstract

A drying temperature acquisition method, characterized in that comprising the following steps: 1, arranging air volume and temperature sensors at the air outlet; 2, fitting the function of temperature about air volume t=f(k); 3, dividing m sub-regions; 4, arranging air volume and temperature sensors at each sub-region; 5, fitting the function of actual air volume of each sub-region about fan air volume kQm=f(j); 6, obtaining real-time air volume J corresponding to the current rotating speed of the motor, and calculating the actual air volume of each sub-region; 7, calculating the temperature value corresponding to the sub-region; 8, calculating the actual temperature value T of the air duct air outlet. The application also discloses a dryer and a washing and drying integrated machine using the temperature acquisition method. The application has the advantages that: the temperature is directly detected by software without using a thermistor, so that the cost is reduced and the detection precision is improved.

Description

Technical Field

[0001] This invention relates to a clothing drying device, and more particularly to a method for collecting the drying temperature of a clothes drying machine, as well as a dryer or washer-dryer combo using the method. Background Technology

[0002] In the existing technology, the drying temperature of a dryer or washer-dryer combo is one of the most important control parameters of the equipment during the drying stage. During the drying process, the accuracy requirements for collecting drying temperature data, such as the inlet temperature or return air temperature, are becoming increasingly higher. A precise temperature parameter can effectively prevent clothes from being over-dried or under-dried.

[0003] Typically, dryer equipment uses a thermistor placed on the duct wall for temperature sampling. For example, Chinese utility model patent number 201721012088.4, "Automatic Thermostat Controller for Dryer," discloses an automatic thermostat controller for a dryer, including a battery, first to fifth resistors, a capacitor, a thermistor, a potentiometer, a voltage comparator, a transistor, a thyristor, and a heating element. This utility model utilizes a thermistor to collect temperature, and the thermistor, first to third resistors, capacitor, and potentiometer, along with an LM358 voltage comparator, form a temperature detection circuit. A thyristor is used to control the heating element, resulting in high control sensitivity and making it worthy of widespread application.

[0004] However, in actual products, due to structural limitations and duct design, the uniformity of temperature within the duct cannot be guaranteed. A temperature acquisition system consisting of a thermistor attached to the inner wall of the duct cannot effectively characterize the temperature within the duct. In some cases, the two ends of the same cross-section within the duct may differ by tens of degrees. Therefore, using thermistors to acquire duct temperature often results in inaccurate acquisition results, low detection precision, and large temperature deviations. This leads to an inability to accurately control the operation of the drying equipment, resulting in poor drying effect and low drying efficiency. Therefore, further improvements to existing dryer equipment are needed. Summary of the Invention

[0005] The first technical problem to be solved by the present invention is to provide a drying temperature acquisition method with lower detection cost and higher temperature detection accuracy in light of the above-mentioned existing technology.

[0006] The second technical problem to be solved by the present invention is to provide a dryer that uses the above-mentioned drying temperature acquisition method in view of the current state of the prior art.

[0007] The third technical problem to be solved by the present invention is to provide a washer-dryer combo machine that uses the above-mentioned drying temperature acquisition method, in view of the current state of the prior art.

[0008] The technical solution adopted by the present invention to solve the first technical problem mentioned above is: a drying temperature acquisition method for acquiring the temperature of the air outlet of the air duct of a drying equipment, characterized in that: the drying temperature acquisition method includes the following steps:

[0009] Step 1: Install airflow sensors and temperature sensors in the sampling area at the air outlet of the air duct;

[0010] Step 2: Select any point on the sampling area of ​​the air outlet of the air duct as the sampling point, measure the air volume points according to the gradient k, take a set of air volume values ​​k1, k2...kn, and measure the corresponding stable temperature t1, t2...tn at each air volume point of the set of air volume values, and fit the temperature with respect to the air volume function t=f(k), where n is a positive integer;

[0011] Step 3: Divide the sampling area of ​​the air duct outlet into m sub-regions Q1, Q2...Qm, where m is a positive integer;

[0012] Step 4: Install airflow sensors and temperature sensors in each sub-area;

[0013] Step 5: Within the calibrated fan speed range, measure the air volume points according to gradient j, and take a set of air volume values ​​j1, j2...jn. At each air volume point, measure the actual air volume values ​​j1(kQ1, kQ2...kQm), j2(kQ1, kQ2...kQm)...jn(kQ1, kQ2...kQm) for each sub-region, where n is a positive integer. Fit the function kQ=f(J) of the actual air volume of each sub-region with respect to the fan air volume.

[0014] Step 6: Obtain the real-time air volume J corresponding to the current motor speed, and calculate the actual air volume KQ1, KQ2, ... KQm corresponding to each sub-region Q1, Q2...Qm;

[0015] Step 7: Based on the function t = f(k) obtained in Step 2, calculate the temperature values ​​tQ1, tQ2, ..., tQm corresponding to the subregions Q1, Q2, ..., Qm respectively;

[0016] Step 8: Based on the temperature value tQ obtained for each sub-region, calculate the actual temperature value T corresponding to the sampling area of ​​the air duct outlet at the current motor speed.

[0017] The actual temperature value T corresponding to the sampling area of ​​the air outlet in step eight is calculated using the mean method, specifically including the following steps:

[0018] Step 81: According to the heating amount formula W Q =S Q Calculate the heating amount W for each sub-region using ×KQ×t×tQ. QThe total heating amount W = W is obtained for the sampling area corresponding to the air outlet of the air duct. Q1 +W Q2 +…+W Qm Where t is the set unit time, and S Q K represents the unit area for each sub-region. Q The actual air volume for each sub-region, and tQ the temperature value for each sub-region;

[0019] Step 82: Calculate the actual temperature corresponding to the sampling area at the air outlet of the air duct. Where t is the unit time set in step eight, W is the total heating amount corresponding to the sampling area of ​​the air duct outlet, S is the total area corresponding to the sampling area of ​​the air duct outlet, and K is the total air volume corresponding to the sampling area of ​​the air duct outlet.

[0020] The actual temperature value T corresponding to the sampling area of ​​the air outlet in step eight is calculated using a weighted method, specifically including the following steps:

[0021] Step 8a: Pre-set the weight ratios δ1, δ2, ..., δm corresponding to each sub-region Q1, Q2...Qm. m ;

[0022] Step 8b: Calculate the actual temperature value TT corresponding to the sampling area of ​​the air outlet of the air duct according to the weight ratio: TT = δ1×tQ1 + δ2×tQ2 + ... + δ m ×tQm, where, δ1+δ2+…+δ m =1.

[0023] To ensure sampling consistency, it is preferable that the sampling area of ​​the air duct outlet is the cross-section of the air duct outlet.

[0024] To facilitate sensor placement and detection, it is preferable to select the center point of the sampling area cross-section of the air duct outlet in step two as the sampling point. Accordingly, the air volume sensor and temperature sensor in step one are respectively set on both sides of this center point.

[0025] Preferably, in step two, the function t = f(k) is fitted using a least squares polynomial function, a logarithmic function, or an exponential function.

[0026] To achieve better measurement results and improve measurement accuracy, it is preferable that the number of sub-region segments, m, in step three ranges from 2 to m to 4. The more sub-region segments, the higher the measurement accuracy. The segmentation rules can be based on equal division or unequal division according to weighted criteria, as needed.

[0027] Preferably, in step five, the function kQ=f(J) is fitted using a least squares polynomial function, a logarithmic function, or an exponential function.

[0028] The technical solution adopted by the present invention to solve the second technical problem mentioned above is: a dryer, including a main unit and an air outlet of an air duct disposed on the main unit, characterized in that: the drying temperature of the air outlet of the dryer is obtained by the drying temperature acquisition method described in the above claims.

[0029] The technical solution adopted by the present invention to solve the third technical problem mentioned above is: a washer-dryer combo machine, including a main unit and an air duct outlet disposed on the main unit, characterized in that: the drying temperature of the air duct outlet of the washer-dryer combo machine adopts the drying temperature acquisition method as described in the above claims.

[0030] Compared with the prior art, the advantages of the present invention are as follows: The drying temperature acquisition method of this application does not require the use of thermistors to acquire temperature, but directly realizes the detection through software. On the one hand, it can effectively reduce the cost of using thermistors, making the product price more competitive; on the other hand, it can greatly improve the detection accuracy of the air outlet temperature, effectively solving the problem of inaccurate temperature detection caused by uneven air volume at the air outlet; the detection method of this application not only provides more accurate detection results, but also is simple and easy to operate, with lower overall cost and strong practicality. Attached Figure Description

[0031] Figure 1 This is one of the schematic diagrams showing the cross-sectional area division of the air duct temperature sampling area in an embodiment of the present invention.

[0032] Figure 2 This is the second schematic diagram of the cross-sectional area division of the air duct temperature sampling area in an embodiment of the present invention.

[0033] Figure 3 This is the third schematic diagram of the cross-sectional area division of the air duct temperature sampling area in an embodiment of the present invention.

[0034] Figure 4 This is a control flowchart of the drying temperature acquisition method according to an embodiment of the present invention. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0036] like Figure 4 As shown in the figure, this embodiment discloses a drying temperature acquisition method for collecting the temperature of the air outlet of the air duct of a drying equipment. The drying temperature acquisition method includes the following steps.

[0037] Step 1: Arrange airflow sensors and temperature sensors in the sampling area of ​​the air outlet of the air duct. The sampling area of ​​the air outlet is selected as the cross-section of the air outlet. Usually, the cross-section of the air outlet is rectangular.

[0038] Step 2: Select any point on the sampling area of ​​the air outlet of the air duct as the sampling point. Usually, the center point of the cross-section is preferred. Accordingly, the air volume sensor and the temperature sensor are respectively set on both sides of the center point. Within the rated speed range of the fan (the fan speed is adjustable in this embodiment), measure the air volume points according to the gradient k, and take a set of air volume values ​​k1, k2...kn. Under each air volume point of the set of air volume values, measure the corresponding stable temperature t1, t2...tn, and fit the temperature with respect to the air volume function t=f(k), where n is a positive integer. The function t=f(k) can be fitted using the least squares polynomial function fitting, logarithmic fitting, or exponential fitting in the prior art.

[0039] Step 3: Divide the sampling area of ​​the air outlet of the air duct into m sub-regions Q1, Q2...Qm, where m is a positive integer; in order to achieve better measurement results and improve measurement accuracy, the value of the number of sub-regions m should be 2≤m≤4.

[0040] Based on the actual designed air duct, we divide the cross-section where the air outlet of the air duct is located into regions. The division of these sub-regions can range from 2 equal parts to N equal parts, such as... Figures 1-3 As shown, the sub-region is divided into 2, 3, and 4 equal parts respectively; and the center point of the division can be the center of the cross-section corresponding to the air outlet of the air duct. The more equal parts the sub-region is divided into (i.e., the more partitions), the more accurate the final detection value and the higher the measurement accuracy. The division rules can be based on equal division or unequal division with matching weights as needed.

[0041] Step 4: Install airflow sensors and temperature sensors in each sub-area.

[0042] Step 5: Within the calibrated fan speed range (the fan speed in this embodiment is adjustable), measure the air volume points according to gradient j, and take a set of air volume values ​​j1, j2...jn. At each air volume point, measure the actual air volume values ​​j1(kQ1, kQ2...kQm), j2(kQ1, kQ2...kQm)...jn(kQ1, kQ2...kQm) for each sub-region, and fit the function kQ=f(J) of the actual air volume of each sub-region with respect to the fan air volume; wherein, the function kQ=f(J) can be fitted using the least squares polynomial function fitting, logarithmic fitting, or exponential fitting in the prior art.

[0043] Step 6: Obtain the real-time air volume J corresponding to the current motor speed. Based on the function kQ=f(J) fitted in Step 5, calculate the actual air volume KQ1, KQ2…KQm corresponding to each sub-region Q1, Q2…Qm.

[0044] Step 7: Based on the function t=f(k) fitted in Step 2, calculate the temperature values ​​tQ1, tQ2, …tQm corresponding to the sub-regions Q1, Q2…Qm respectively.

[0045] Step 8: Based on the temperature value tQ obtained for each sub-region, calculate the actual temperature value T corresponding to the sampling area of ​​the air outlet of the air duct at the current speed of the motor using the mean method or the weighted method.

[0046] Preferably, the actual temperature value T corresponding to the sampling area of ​​the air outlet of the air duct in step eight is calculated using the mean method, which specifically includes the following steps:

[0047] Step 81: According to the heating amount formula W Q =S Q ×K Q Calculate the heating amount W for each sub-region using ×t×tQ. Q The total heating amount W = W is obtained for the sampling area corresponding to the air outlet of the air duct. Q1 +W Q2 +…+W Qm Where t is the set unit time, and S Q KQ represents the unit area corresponding to each sub-region, KQ represents the actual air volume corresponding to each sub-region, and tQ represents the temperature value corresponding to each sub-region.

[0048] Step 82: Calculate the actual temperature corresponding to the sampling area at the air outlet of the air duct. Where t is the unit time set in step eight, W is the total heating amount corresponding to the sampling area of ​​the air duct outlet, S is the total area corresponding to the sampling area of ​​the air duct outlet, and K is the total air volume corresponding to the sampling area of ​​the air duct outlet.

[0049] As another preferred method, the actual temperature value T corresponding to the sampling area of ​​the air outlet in step eight is calculated using a weighted method, which specifically includes the following steps:

[0050] Step 8a: Pre-set the weight ratios δ1, δ2, ..., δm corresponding to each sub-region Q1, Q2...Qm. m ;

[0051] Step 8b: Calculate the actual temperature value T corresponding to the sampling area of ​​the air outlet of the air duct according to the weight ratio: T = δ1×tQ1 + δ2×tQ2 + … + δ m ×tQm, where, δ1+δ2+…+δ m =1.

[0052] The drying temperature detection method of this embodiment can be applied to the temperature detection of the air outlet of any existing equipment, such as a dryer or a washer-dryer combo.

[0053] When applied to a dryer, the dryer includes a main unit and an air outlet in the air duct installed on the main unit, and the drying temperature at the air outlet of the dryer is obtained using the drying temperature acquisition method described above.

[0054] When applied to a washer-dryer combo, the washer-dryer combo includes a main unit and an air duct outlet set on the main unit. The drying temperature of the air duct outlet of the washer-dryer combo is obtained using the drying temperature acquisition method described above.

[0055] The drying temperature detection method in this embodiment is summarized in a simple way, mainly using a three-step method:

[0056] The first step is to obtain the air volume parameter related to temperature by fitting a computable function t = f(k) for temperature in relation to air volume.

[0057] The second step is to obtain the air volume parameters of the sub-regions and fit a calculable function kQ=f(J) of the actual air volume of each sub-region with respect to the fan air volume.

[0058] The third step is to calculate the actual temperature T.

[0059] Traditional methods for collecting air temperature at duct outlets typically involve placing a temperature sensor (thermometer) on the duct wall to collect the air temperature at the outlet. However, since the airflow at the duct outlet is not uniform and the temperature sensor is not necessarily installed at the center of the airflow, there are deviations in the temperature detection, resulting in inaccurate results. Furthermore, a separate temperature sensor is required.

[0060] This embodiment eliminates the need for a temperature sensor (thermometer). It only requires detecting the current motor speed to obtain the corresponding air volume. By pre-fitting and storing two functions t=f(k) and kQ=f(J) in the controller, the final drying temperature of the air outlet can be calculated. The detection is entirely implemented through software, eliminating the need to install a temperature sensor, saving detection costs. Moreover, the detection method is simpler and more direct, easy to operate, and has a wide range of applications.

[0061] Therefore, by implementing feedback motor speed, the outlet temperature can be calculated by the controller, solving the problem of uneven temperature difference and saving the cost of installing temperature sensors.

Claims

1. A method for acquiring drying temperature, used to acquire the temperature of the air outlet of the air duct of a drying equipment, characterized in that: The drying temperature acquisition method includes the following steps: Step 1: Install airflow sensors and temperature sensors in the sampling area at the air outlet of the air duct; Step 2: Select any point on the sampling area of ​​the air outlet of the air duct as the sampling point, measure the air volume points according to the gradient k, take a set of air volume values ​​k1, k2...kn, and measure the corresponding stable temperature t1, t2...tn at each air volume point of the set of air volume values, and fit the temperature with respect to the air volume function t=f(k), where n is a positive integer; Step 3: Divide the sampling area of ​​the air duct outlet into m sub-regions Q1, Q2...Qm, where m is a positive integer; Step 4: Install airflow sensors and temperature sensors in each sub-area; Step 5: Within the calibrated fan speed range, measure air volume points according to gradient j, and take a set of air volume values ​​j1, j2…jn. At each air volume point, measure the actual air volume values ​​j1(kQ1, kQ2…kQm), j2(kQ1, kQ2…kQm)…jn(kQ1, kQ2…kQm) for each sub-region. Fit the function kQ=f(J) of the actual air volume of each sub-region with respect to the fan air volume, where n is a positive integer; Step 6: Obtain the real-time air volume J corresponding to the current motor speed, and calculate the actual air volume KQ1, KQ2, ... KQm corresponding to each sub-region Q1, Q2...Qm; Step 7: Based on the function t = f(k) obtained in Step 2, calculate the temperature values ​​tQ1, tQ2, ..., tQm corresponding to the subregions Q1, Q2, ..., Qm respectively; Step 8: Based on the temperature value tQ obtained for each sub-region, calculate the actual temperature value T corresponding to the sampling area of ​​the air duct outlet at the current motor speed.

2. The drying temperature acquisition method according to claim 1, characterized in that: The actual temperature value T corresponding to the sampling area of ​​the air outlet in step eight is calculated using the mean method, specifically including the following steps: Step 81: According to the heating amount formula W Q =S Q ×K Q Calculate the heating amount W for each sub-region using ×t×tQ. Q The total heating amount W = W is obtained for the sampling area corresponding to the air outlet of the air duct. Q1 +W Q2 +…+W Qm Where t is the set unit time, and S Q K represents the unit area for each sub-region. Q The actual air volume for each sub-region, and tQ the temperature value for each sub-region; Step 82: Calculate the actual temperature corresponding to the sampling area at the air outlet of the air duct. Where t is the unit time set in step eight, W is the total heating amount corresponding to the sampling area of ​​the air duct outlet, S is the total area corresponding to the sampling area of ​​the air duct outlet, and K is the total air volume corresponding to the sampling area of ​​the air duct outlet.

3. The drying temperature acquisition method according to claim 1, characterized in that: The actual temperature value T corresponding to the sampling area of ​​the air outlet in step eight is calculated using a weighted method, specifically including the following steps: Step 8a: Pre-set the weight ratios δ1, δ2, ..., δm corresponding to each sub-region Q1, Q2...Qm. m ; Step 8b: Calculate the actual temperature value T corresponding to the sampling area of ​​the air outlet of the air duct according to the weight ratio: T = δ1×tQ1 + δ2×tQ2 + … + δ m ×tQm, where, δ1+δ2+…+δ m =1.

4. The drying temperature acquisition method according to claim 1, characterized in that: The sampling area of ​​the air outlet of the air duct is the cross-section of the air outlet of the air duct.

5. The drying temperature acquisition method according to claim 1, characterized in that: In step two, the sampling point is selected as the center point of the cross-section of the sampling area at the air outlet of the air duct. Correspondingly, the air volume sensor and temperature sensor in step one are respectively set on both sides of this center point.

6. The drying temperature acquisition method according to claim 1, characterized in that: In step two, the function t = f(k) is fitted using a least squares polynomial function, a logarithmic function, or an exponential function.

7. The drying temperature acquisition method according to claim 1, characterized in that: The value range of the number of sub-regions m in step three is 2≤m≤4.

8. The drying temperature acquisition method according to claim 1, characterized in that: In step five, the function kQ=f(J) is fitted using the least squares polynomial function, logarithmic function, or exponential function.

9. A dryer, comprising a main unit and an air duct outlet disposed on the main unit, characterized in that: The drying temperature at the air outlet of the dryer is obtained using the drying temperature acquisition method described in any one of claims 1 to 8.

10. A washer-dryer combo, comprising a main unit and an air duct outlet disposed on the main unit, characterized in that: The drying temperature at the air outlet of the washer-dryer is obtained using the drying temperature acquisition method described in any one of claims 1 to 8.

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