A power test method for clothes dryer

Abstract

The present invention discloses a power test method for a clothes dryer, comprising the following steps: a transmission line drives the clothes dryer to move in a preheating chamber, wherein a power circulation component including a power supply socket is provided in the preheating chamber; the clothes dryer is connected to the power supply socket for preheating for X seconds in a moving state; X is greater than 0; the transmission line drives the clothes dryer to enter a test chamber, wherein a power meter is provided in the test chamber, and the clothes dryer is connected to the power meter for power testing. The power test method for a clothes dryer provided by the present invention can realize heating and preheating during the transmission process of the clothes dryer, thereby improving the efficiency of the power test of the clothes dryer.

Description

Technical Field

[0001] The invention relates to the field of performance testing of clothes dryers, and in particular to a power testing method for clothes dryers. Background Art

[0002] With the continuous advancement of the wave of consumption upgrades at home and abroad, consumers' demand for dryers is increasing, especially during the "return of the south wind" in the south every year, when dryers are shipped in huge quantities. Drying clothes in a humid environment has become the most basic consumer demand of the whole people. As a result, the market size of dryers has been growing year by year, and the market prospects are broad. Wardrobe-type dryers have achieved rapid expansion in the online market size in the past few years due to their simple structure, low price, and easy storage.

[0003] To ensure the stability of performance, the current power testing method for wardrobe-type dryers is relatively complicated: first manually install the wardrobe, preheat it, and then conduct a power test after the power stabilizes. After the test is completed, the wardrobe is removed. The entire power testing process is cumbersome and inefficient, which cannot meet the high-efficiency production needs of the production line and cannot quickly meet the growing market sales needs. Summary of the invention

[0004] The present invention aims to solve one of the problems in the related art to at least a certain extent. To this end, the purpose of the present invention is to provide a power test method for a clothes dryer, which can realize heating and preheating during the transmission process of the clothes dryer, thereby improving the efficiency of the power test of the clothes dryer.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical solution: a power testing method for a clothes dryer, comprising the following steps:

[0006] The transmission line drives the clothes dryer to move in the preheating chamber, wherein a power circulation component including a power socket is arranged in the preheating chamber; the clothes dryer is connected to the power socket for preheating for X seconds in a moving state; X is greater than 0;

[0007] The transmission line drives the clothes dryer into a test room, in which a power meter is arranged, and the clothes dryer is connected to the power meter for power testing.

[0008] Furthermore, the power supply socket in the power supply circulation component moves in the same direction as the transmission line.

[0009] Furthermore, before the clothes dryer enters the preheating chamber, the method further includes: obtaining the power value correlation when the clothes dryer is installed with a wardrobe and when the clothes dryer is not installed with a wardrobe under the same test environment;

[0010] If the power values ​​when a wardrobe is installed are positively or negatively correlated with those when a wardrobe is not installed, the transmission line drives the dryer without a wardrobe installed into the preheating chamber; otherwise, the transmission line drives the dryer with a wardrobe installed into the preheating chamber.

[0011] Furthermore, when the power values ​​when the wardrobe is installed and when the wardrobe is not installed are positively correlated or negatively correlated, a power compensation value is obtained based on the difference between the two; the power compensation value is used to compensate for the power tested by the power meter.

[0012] Furthermore, a specific method for obtaining a power compensation value is as follows: take N clothes dryers, run them for X seconds with and without a wardrobe installed under the same test environment, and measure the corresponding two power values ​​respectively; obtain two power values ​​of N groups of clothes dryers, calculate the mean difference of the N groups of power values, and use the mean difference as the power compensation value, where N is an integer greater than 0.

[0013] Furthermore, before obtaining the power correlation when the clothes dryer is installed with a wardrobe and when the clothes dryer is not installed with a wardrobe, it also includes: confirming the stability of the speed of the fan in the clothes dryer, and the specific steps are: collecting and analyzing data on the fans in the M clothes dryers, and calculating the intra-group capability index Cp and the overall capability index Pp. If the intra-group capability index Cp and the overall capability index Pp are both greater than the set value, it is determined that the speed of the fan in the clothes dryer is stable, and the stable speed value is obtained;

[0014] If the intra-group capability index Cp or the overall capability index Pp is less than the set value, it is determined that the fan speed in the dryer is unstable, and subsequent power testing is stopped. N is an integer greater than 0.

[0015] Furthermore, when the dryer is subjected to a power test in a test room, the fan in the dryer maintains a stable speed value.

[0016] Furthermore, when obtaining the power correlation between the dryer installed with a wardrobe and without a wardrobe under the same test environment, the fan in the dryer maintains a stable speed value.

[0017] Furthermore, the heating component of the clothes dryer is a PTC ceramic, and the PTC ceramic has a maximum resistance and a minimum resistance;

[0018] When the clothes dryer is subjected to a power test in a test chamber, the temperature in the test chamber is maintained between a temperature value corresponding to a minimum resistance of the PTC ceramic and a temperature value corresponding to a maximum resistance of the PTC ceramic.

[0019] Furthermore, when obtaining the power correlation between the clothes dryer installed with a wardrobe and without a wardrobe under the same test environment, the temperature of the test environment is maintained between the temperature value corresponding to the minimum resistance and the temperature value corresponding to the maximum resistance.

[0020] The above technical solution provided by the embodiment of the present application has the following advantages over the prior art: the testing device of the present application includes a preheating chamber and a testing chamber, and the preheating chamber and the testing chamber are adjacent to each other, and a transmission line and a power circulation component are arranged in the preheating chamber, and the power circulation component provides a power supply socket for the dryer on the transmission line, so that the dryer can be preheated during the transmission process, and by adjusting the speed of the power circulation component and the transmission line, the time from plugging in the dryer to removing it from the preheating chamber can be ensured, and this time is the preheating time; after preheating, the dryer is directly connected to the power meter for testing, and the method of the present application uses the power circulation component to preheat the dryer, so that the power value of the dryer is stable within a certain range when it enters the testing chamber, and then it can be quickly connected to the power meter for testing, thereby improving the power testing efficiency of the dryer. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0023] In the attached figure:

[0024] Figure 1 is the resistance-temperature curve of the PTC ceramic in the clothes dryer of Example 1;

[0025] Figure 2 The process capability histogram of the fan speed test of 30 clothes dryers in Example 1 is as follows;

[0026] Figure 3 The histogram of 200 clothes dryers tested with and without wardrobes installed in Example 1;

[0027] Figure 4 This is a scatter plot of 200 clothes dryers taken in Example 1 for testing with and without wardrobe installation. DETAILED DESCRIPTION

[0028] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, are constructed and operated in a specific direction, and are only for the convenience of describing the present technical solution, rather than indicating that the mechanism or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0029] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third", etc. can explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0030] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, mechanisms, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0031] The present application provides a power testing method for a clothes dryer, comprising the following steps:

[0032] The transmission line drives the clothes dryer to move in the preheating chamber, and a power circulation component including a power socket is arranged in the preheating chamber; the clothes dryer is connected to the power socket for preheating for X seconds in a moving state; X is greater than 0;

[0033] The transmission line drives the dryer into the test room, where a power meter is installed. The dryer is connected to the power meter for power testing.

[0034] The test device of the present application includes a preheating chamber and a test chamber, and the preheating chamber and the test chamber are adjacent to each other. A transmission line and a power circulation component are arranged in the preheating chamber. The power circulation component provides a power supply socket for the dryer on the transmission line, so that the dryer can be preheated during the transmission process. By adjusting the speed of the power circulation component and the transmission line, the time from plugging in the dryer to removing it from the preheating chamber can be ensured, and this time is the preheating time. After preheating, the dryer is directly connected to the power meter for testing. The method of the present application uses the power circulation component to preheat the dryer, so that the power value of the dryer is stable within a certain range when entering the test chamber, and then it can be quickly connected to the power meter for testing, thereby improving the power test efficiency of the dryer.

[0035] The power socket in the power circulation assembly of the present application moves in the same direction as the transmission line, ensuring that the power socket can supply power to the dryer in a timely manner when the dryer moves along the transmission line.

[0036] Example 1

[0037] A power testing method for a clothes dryer comprises the following steps:

[0038] S1: Confirm the stability of the fan speed in the dryer. The specific steps are: collect and analyze data on the fans in M ​​dryers, and calculate the intra-group capability index Cp and the overall capability index Pp. If the intra-group capability index Cp and the overall capability index Pp are both greater than the set value, the fan speed in the dryer is determined to be stable, and the stable speed value is obtained; if the intra-group capability index Cp or the overall capability index Pp is less than the set value, the fan speed in the dryer is determined to be unstable, and the subsequent power test is stopped, and the dryer is returned for repair; N is an integer greater than 0.

[0039] Because the power value of the dryer is mainly affected by two factors: the speed of the internal brushless DC fan and the test environment temperature, in order to ensure the accuracy of the dryer power test, the fan speed of the tested dryer must be kept consistent. Otherwise, the assembly line test of this application is not applicable to dryers with different fan speeds.

[0040] In this embodiment, 30 clothes dryers are randomly selected to collect and analyze the data of their fans. Under the same test environment, the fan speeds corresponding to the 30 clothes dryers are obtained respectively, and the fan speeds are made into the following figures. Figure 2The process capability histogram shown in the figure shows that the lower specification limit on the left side is 3200rpm, the upper specification limit on the right side is 3500rpm, the target in the middle is 3350rpm, and the mean of 30 samples is 3350rpm. It can be seen that the reference lines on the left and right sides of the histogram are the upper and lower specification limits respectively, and all the test values ​​of the brushless DC fan speed are within the specified limits. The histogram and the two overlapping overall normal curves and the internal normal curves show that the surface fan speed approximately obeys the normal distribution and can meet the analysis requirements. The reference line in the center of the histogram is the target value (target), which fits the peak of the normal curve. The sample mean of the brushless DC fan speed is 3350rpm, which is consistent with the target value of 3350rpm.

[0041] Attached Figure 2 The overall capability index Pp and the group (potential) capability index Cp are about 1.7, both greater than the reference value of 1.33, indicating that the process capability is sufficient. Ppk and Cpk are about 1.7, indicating that there is no separation; Cpm = 1.63> 1.33, indicating that the data is very close to the target value; the expected overall total PPM is: 0.28, that is, the expected unqualified rate of the brushless DC fan speed is: 0.28×10 -6 , indicating that about 1 out of every million products does not meet the speed requirements. The above data analysis shows that the speed consistency of this fan is good. The production process control capacity is sufficient, and the speed has little effect on the power value of the whole machine, so this factor can be ignored.

[0042] Similarly, as shown in Table 1, the corresponding grade judgments, unqualified rate contents and measures to be taken during the test under different intra-group (potential) capability indexes Cp are shown.

[0043] Table 1 Different measures corresponding to different Cp values

[0044]

[0045] S2: Confirm the test temperature of the dryer. The heating element of the dryer is PTC ceramic, which has a maximum resistance and a minimum resistance, as shown in the attached Figure 1 As shown, the resistance of PTC ceramics is related to its own temperature. When the temperature is lower than Tmin, the resistance increases and decreases with the temperature, showing a negative temperature coefficient. For example, in section A of the R-T curve, if the temperature is between Tmin and Tmax, the resistance of the PTC ceramic increases sharply with the increase in temperature, showing a positive temperature coefficient, such as section B of the curve. This section has application value. When the temperature is higher than Tmax, the resistance of the PTC ceramic decreases with the increase in temperature. At room temperature, PTC ceramics have low resistance. After the voltage is applied, the current is large and the temperature rises. However, when the PTC ceramic is fully heated, the resistance increases, the current decreases, and the heating power P=U 2 / R is smaller than the heat dissipation power, so the temperature drops; when the temperature drops, the resistance decreases, the current increases, the heat dissipation power increases, and the temperature rises instead. This negative feedback will keep the temperature of the heating element constant.

[0046] According to the inherent characteristics of PTC ceramics, the ambient temperature of the test performance room is controlled at 23±2°. After the whole machine is heated for 80 seconds, the power output value fluctuates within a stable range. This verifies the influence of the ambient temperature of the test space on the power value of the whole machine under the conditional environment.

[0047] S3: Obtain the correlation between the power values ​​of the dryer when it is installed with a wardrobe and when it is not installed with a wardrobe under the same test environment; if the power values ​​when it is installed with a wardrobe and when it is not installed with a wardrobe are positively correlated or negatively correlated, the transmission line drives the dryer without a wardrobe installed into the preheating chamber; otherwise, the transmission line drives the dryer with a wardrobe installed into the preheating chamber.

[0048] Specifically, 200 dryers can be randomly selected to be installed in wardrobes. Under the same test environment, the wardrobe zippers are opened and closed for 80 seconds respectively, and the corresponding two power values ​​are measured respectively. The two power values ​​of 200 groups of dryers are obtained, the mean difference of the 200 groups of power values ​​is calculated, and the mean difference is used as the power compensation value.

[0049] The method for obtaining two power values ​​of one of the dryers is as follows: a. Take a dryer and install it in a wardrobe. Before zipping up the wardrobe, record the space temperature displayed by the current temperature tester: 24.5°. After zipping up the wardrobe, turn on the heating of the whole machine and run for 80S. Open the wardrobe and record the ambient temperature in the wardrobe again: 29.2°. The power test value shows that the power of the whole machine is: 967W. b. Take the same dryer and wait for it to cool down completely. The ambient temperature of the test performance room is: 24.5°. After turning it on and running for 80S without installing a wardrobe, the space temperature of the performance room is 24.7°, and the power value of the whole machine is: 1013W. By verifying the impact of the change in the ambient temperature of the test space on the power value of the whole machine as above, the power value of the whole machine with and without a wardrobe differs by nearly 45W when the ambient temperature differs by 5°. The power value differs by nearly 10W when the ambient temperature changes by 1°.

[0050] Repeat the above steps to obtain the two power values ​​of 200 dry closets with and without wardrobes installed, as shown in the attached figure. Figure 3 As shown, the left side is the power distribution diagram when the wardrobe is not installed, and the right side is the power distribution diagram when the wardrobe is installed. The test data was analyzed by using the Minitab quality analysis tool to perform histogram data analysis, and the standard deviation of the power value with and without the wardrobe installed was 7.16, and the mean difference was 36.

[0051] The correlation between the power test values ​​of the two is analyzed by using a scatter plot, as shown in the attached figure. Figure 4As shown, it can be concluded that there is a positive correlation between the two. Therefore, it can be concluded that by using the difference in the power value of the whole machine after the ambient temperature of the test space changes, the power value of the whole machine can be tested quickly without installing a wardrobe and by using power value compensation, and the result is reliable.

[0052] When the power values ​​when a wardrobe is installed are positively correlated or negatively correlated with those when a wardrobe is not installed, the clothes dryer enters step S4 for testing without installing a wardrobe, otherwise, the clothes dryer needs to install a wardrobe and then enters step S4 for testing.

[0053] S4: The transmission line drives the dryer to move in the preheating chamber, and a power circulation component including a power socket is provided in the preheating chamber; the dryer is connected to the power socket for preheating for X seconds in a moving state; X is greater than 0; when the dryer moves out of the preheating chamber, the dryer is disconnected from the power socket.

[0054] According to this product, it takes about 80 seconds for the power of the whole machine to stabilize after preheating. Based on this time, the speed of the transmission line and the power circulation components are adjusted to ensure that the time from plugging in the dryer to removing it from the preheating chamber is 80 seconds.

[0055] S5: The transmission line drives the dryer into the test room, where a power meter is installed. The dryer is connected to the power meter for power testing. After preheating, the dryer can be tested directly, and the test time only takes 13 seconds to complete, which greatly improves the test efficiency and reliability of the dryer.

[0056] Among them, for the dryer without a wardrobe installed, the final power value is equal to the sum of the test power value and the power compensation value. For example, the above calculation shows that the average difference between the power value with a wardrobe installed and the power value without a wardrobe installed is 36, and the two are positively correlated. Therefore, the final power value is equal to the test power value plus 36.

[0057] In actual tests, it takes at least 25 seconds to install and dismantle a wardrobe. This application confirms that the power values ​​when the wardrobe is installed are positively or negatively correlated with those when the wardrobe is not installed. When the conditions are met, the dryer can be measured without the wardrobe installed, saving the steps of installing and dismantling the wardrobe. The original power test method was shortened from 115 seconds per unit to 13 seconds per unit, and the test time was shortened by 8.85 times; the test efficiency was increased from 32 units / hour to 277 units / hour.

[0058] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, the above technical features can be freely combined without departing from the concept of the present invention, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the coverage of the claims of the present invention.

Claims

1. A power test method for a clothes dryer, characterized in that: The steps include: The transmission line drives the clothes dryer to move in the preheating chamber, wherein a power circulation component including a power socket is arranged in the preheating chamber; the clothes dryer is connected to the power socket for preheating for X seconds in a moving state; X is greater than 0; The transmission line drives the clothes dryer into a test room, where a power meter is provided, and the clothes dryer is connected to the power meter for power testing; Before the clothes dryer enters the preheating chamber, the further step includes: obtaining the power value correlation when the clothes dryer is installed with a wardrobe and when the clothes dryer is not installed with a wardrobe under the same test environment; If the power values ​​when a wardrobe is installed are positively or negatively correlated with those when a wardrobe is not installed, the transmission line drives the dryer without a wardrobe installed into the preheating chamber; otherwise, the transmission line drives the dryer with a wardrobe installed into the preheating chamber.

2. A clothes dryer power testing method according to claim 1, characterized in that: The power supply socket in the power supply circulation assembly moves in the same direction as the transmission line.

3. A power testing method for a clothes dryer according to claim 1, characterized in that: When the power values ​​when the wardrobe is installed and when the wardrobe is not installed are positively correlated or negatively correlated, a power compensation value is obtained according to the difference between the two; the power compensation value is used to compensate for the power tested by the power meter.

4. A clothes dryer power testing method according to claim 3, characterized in that: The specific method for obtaining the power compensation value is: take N clothes dryers, run them for X seconds with and without wardrobes installed under the same test environment, and measure the corresponding two power values ​​respectively; obtain the two power values ​​of N groups of clothes dryers, calculate the average difference of the N groups of power values, and use the average difference as the power compensation value, where N is an integer greater than 0.

5. The power testing method of a clothes dryer according to claim 1, characterized in that: Before obtaining the power correlation when the clothes dryer is installed with a wardrobe and when the clothes dryer is not installed with a wardrobe, the method further includes: confirming the stability of the speed of the fan in the clothes dryer, and specifically the following steps: performing data collection and analysis on the fans in the M clothes dryers, and calculating the intra-group capability index Cp and the overall capability index Pp; if both the intra-group capability index Cp and the overall capability index Pp are greater than the set value, it is determined that the speed of the fan in the clothes dryer is stable, and the stable speed value is obtained; If the intra-group capability index Cp or the overall capability index Pp is less than the set value, it is determined that the fan speed in the dryer is unstable, and subsequent power testing is stopped. N is an integer greater than 0.

6. A clothes dryer power testing method according to claim 5, characterized in that: When the clothes dryer is subjected to a power test in a test room, the fan in the clothes dryer maintains a stable speed value.

7. The power testing method of a clothes dryer according to claim 5, characterized in that: When obtaining the power correlation between the clothes dryer installed with a wardrobe and without a wardrobe under the same test environment, the fan in the clothes dryer maintains a stable speed value.

8. The power testing method of a clothes dryer according to claim 5, characterized in that: The heating component of the clothes dryer is a PTC ceramic, and the PTC ceramic has a maximum resistance and a minimum resistance; When the clothes dryer is subjected to a power test in a test chamber, the temperature in the test chamber is maintained between a temperature value corresponding to a minimum resistance of the PTC ceramic and a temperature value corresponding to a maximum resistance of the PTC ceramic.

9. A clothes dryer power testing method according to claim 8, characterized in that: When obtaining the power correlation of the clothes dryer when the wardrobe is installed and when the wardrobe is not installed under the same test environment, the temperature of the test environment is maintained between the temperature value corresponding to the minimum resistance and the temperature value corresponding to the maximum resistance.

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