Device and method for detecting air tightness of drain pipe of washing machine

Abstract

The invention discloses a washing machine drain pipe airtightness detection device and a detection method thereof. The washing machine drain pipe airtightness detection device comprises a connecting bent pipe, a corrugated drain pipe, a plugging block and an air inlet sealing block. The corrugated water drainage pipe and the air inlet sealing block are connected to the two ends of the connecting bent pipe in a sealed mode respectively, the blocking block is connected to the end, away from the connecting bent pipe, of the corrugated water drainage pipe in a sealed mode, and a through air inlet channel is formed in the air inlet sealing block. The end, away from the connecting bent pipe, of the air inlet channel is connected with the air conveying end of the air tightness detector in a sealed and communicated mode through a sealing air pipe, and an air pressure buffering cavity is formed by designing the reducing connecting bent pipe so as to offset turbulent flow and volume fluctuation generated when airflow flows in the corrugated drainage pipe. The accuracy and reliability of airtightness detection of the corrugated drain pipe of the washing machine are improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of washing machine drain pipe air tightness detection, and particularly relates to a washing machine drain pipe air tightness detection device and a detection method thereof. BACKGROUND

[0002] The air tightness of a washing machine corrugated drain pipe directly affects the use performance. In the existing detection technology, the detection result is too dependent on the single judgment result of the air tightness detector, and the deviation of the detection result caused by the sensor fault of the detector itself, the damage of the internal air path or the gap of the sealed air pipe connected with the external components cannot be excluded. In the detection process, the characteristics of the corrugated drain pipe itself and the volume fluctuation caused by the deformation of the corrugated drain pipe after the gas is filled are not considered, so that the error of the detection result is large. SUMMARY

[0003] The application aims to overcome the deficiencies in the prior art, and provides a washing machine drain pipe air tightness detection device and a detection method thereof. A variable-diameter connecting elbow is designed to form an air pressure buffer cavity to offset the turbulence and volume fluctuation generated when the gas flows in the corrugated drain pipe. The laser ranging module and the image detection module are dynamically aligned with the wave peak to detect the deformation, the detection result of the pressure sensor and the detection result of the air tightness detector are combined, and the results of the three are jointly analyzed to improve the accuracy and reliability of the washing machine corrugated drain pipe air tightness detection.

[0004] Technical scheme: To achieve the above-mentioned purpose, the washing machine drain pipe air tightness detection device and the detection method thereof of the application comprise a connecting elbow, a corrugated drain pipe, a blocking block and an air inlet sealing block. The corrugated drain pipe and the air inlet sealing block are respectively sealed and connected at both ends of the connecting elbow. The blocking block is sealed and connected at the end of the corrugated drain pipe away from the connecting elbow. The air inlet sealing block is provided with a through air inlet channel. The end of the air inlet channel away from the connecting elbow is connected with the gas inlet end of the air tightness detector in a sealed and communicated manner through a sealed air pipe.

[0005] Further, the connecting elbow is provided with a secondary elbow. The secondary elbow is arranged in communication with the connecting elbow. The end of the secondary elbow away from the connecting elbow is connected with a gas guide pipe in a communicated manner. The gas guide pipe is connected with the sensor module of the air tightness detector in a communicated manner through a pipe connecting structure.

[0006] Further, the pipe connecting structure comprises a matching connecting block. The matching connecting block is provided with a through communication channel. The end of the matching connecting block is connected with the end of the gas guide pipe away from the secondary elbow in a sealed and communicated manner through the communication channel and the sealed air pipe. The other end of the matching connecting block is connected with the sensor module of the air tightness detector in a communicated manner through the communication channel and the sealed air pipe.

[0007] Further, the connecting elbow is a variable-diameter elbow, the port of the end with larger radius of the connecting elbow is defined as the anti-disengagement interface, the port of the end with smaller radius of the connecting elbow is defined as the connecting interface, the inner wall of the anti-disengagement interface is provided with anti-disengagement friction-increasing lines; in the assembled state, the air inlet sealing block is in sealing connection with the anti-disengagement interface, and the corrugated drain pipe is in sealing connection with the connecting interface, and the anti-disengagement friction-increasing lines can prevent the air inlet sealing block from disengaging from the connecting elbow after the gas conveying end of the air tightness detector conveys gas into the connecting elbow through the air inlet sealing block.

[0008] Further, the device further comprises a storage box, the storage box is provided with a detection platform, the detection platform is provided with a fixing area and a guide area, the fixing area is provided with a plurality of clamping blocks, and the guide area is provided with a guide structure; in the assembled state, the connecting elbow is clamped and fixed in the fixing area through the clamping blocks, and the corrugated drain pipe and the plug are in the guide area and are connected with the guide structure in cooperation; after the gas conveying end of the air tightness detector conveys gas into the connecting elbow through the air inlet sealing block, the corrugated drain pipe will be elongated along its own axis under the action of gas pressure and will move with the plug in the guide area, and the guide structure can guide the movement of the corrugated drain pipe and the plug.

[0009] Further, one side of the guide area is provided with a laser ranging module and an image detection module, the laser ranging module comprises a plurality of laser sensors arranged along the length direction of the guide area, and each laser sensor can rotate relative to the detection platform; the image detection module can detect and identify the shape of the corrugated drain pipe in the guide area, and guide the laser emitted by each laser sensor in the laser ranging module to correspond to each wave crest of the corrugated drain pipe one by one, and after the whole system reaches a stable state, the laser ranging module can detect the elongation length of the corrugated drain pipe and the distance between two adjacent wave crests.

[0010] Further, one side of the guide area is provided with a laser ranging module and an image detection module, the laser ranging module comprises a plurality of laser sensors arranged along the length direction of the guide area, and each laser sensor can rotate relative to the detection platform; the image detection module can detect and identify the shape of the corrugated drain pipe in the guide area, and guide the laser emitted by each laser sensor in the laser ranging module to correspond to each wave crest of the corrugated drain pipe one by one, and after the whole system reaches a stable state, the laser ranging module can detect the elongation length of the corrugated drain pipe and the distance between two adjacent wave crests.

[0011] Further, a detection method of a washing machine drain pipe air tightness detection device, comprising the following steps:

[0012] Step one: the corrugated drain pipe, the air inlet sealing block and the guide pipe are respectively sealingly installed on the connecting interface, the anti-disengagement interface and the end of the secondary elbow away from the connecting elbow of the connecting elbow;

[0013] Step two: connect the sealing plug to the corrugated drain pipe away from the connecting elbow;

[0014] Step three: connect the air guide pipe away from the connecting elbow to the matching connecting plug through the sealing air pipe;

[0015] Step four: connect the air inlet channel on the air inlet sealing plug and the communication channel on the matching connecting plug to the gas delivery end and the sensor module of the air tightness detector respectively through the sealing air pipe;

[0016] Step five: deliver gas into the connecting elbow through the gas delivery end of the air tightness detector;

[0017] Step six: the air pressure environment formed in the connecting elbow in step five is transmitted to the sensor module of the air tightness detector through the secondary elbow, the air guide pipe, the sealing air pipe and the matching connecting plug in turn, and the sensor module can detect the air pressure parameter and the pressure holding time in the connecting elbow; if the detection result of the sensor module is the same as the preset structure, it is determined that the air tightness of the corrugated drain pipe is qualified, otherwise it is not qualified.

[0018] Beneficial effects: compared with the prior art, the air tightness detection device for the drain pipe of the washing machine and the detection method have the following beneficial effects

[0019] 1. The air pressure buffer cavity is formed by the anti-disconnection interface of the variable-diameter connecting elbow, which reduces the air flow velocity, absorbs volume fluctuations, avoids turbulent flow errors caused by sudden changes in the cross section of the corrugated pipe and deformation, increases the friction force between the air inlet sealing plug and the elbow by the anti-disconnection friction pattern, offsets the disconnection trend caused by the large pressure area, and ensures the stability of the air path sealing.

[0020] 2. The results of pressure and pressure holding time detection by the air tightness detector, wave peak distance detection by the laser ranging module, and force verification by the pressure sensor are combined for analysis, which can exclude false judgments caused by single device failure or air path connection leakage, and significantly improve accuracy.

[0021] 3. By cooperating the laser ranging module with the image detection module, the wave peaks of the corrugated pipe can be dynamically aligned, the change of the wave peak distance in the deformation process can be accurately captured, local leakage can be effectively identified, and the problem of local defects that cannot be positioned by traditional detection can be solved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structure connection diagram of the air tightness detection device for the drain pipe of the washing machine;

[0023] Figure 2 It is a structure diagram of the connecting elbow;

[0024] Figure 3Figure 2 is a half sectional view of the air inlet sealing block of the present application;

[0025] Figure 4 Figure 3 is a half sectional view of the block of the present application;

[0026] Figure 5 Figure 4 is a half sectional view of the connecting fitting block of the present application;

[0027] Figure 6 Figure 5 is an installation schematic view of the components in the second embodiment of the present application;

[0028] Figure 7 Figure 6 is a partial enlarged view A. DETAILED DESCRIPTION

[0029] The present application will be further described below in conjunction with the accompanying drawings.

[0030] As shown in the accompanying drawings, Figures 1-5 A washing machine air tightness detection device includes a connecting elbow 1, a corrugated drain pipe 2, a block 3 and an air inlet sealing block 4. The corrugated drain pipe 2 and the air inlet sealing block 4 are respectively sealed and connected at both ends of the connecting elbow 1. The block 3 is of a solid structure and is sealed and connected at an end of the corrugated drain pipe 2 away from the connecting elbow 1. The air inlet sealing block 4 is provided with a through air inlet channel 5. An end of the air inlet channel 5 away from the connecting elbow 1 is sealed and communicated with a gas inlet end of an air tightness detector 7 through a sealed gas pipe 6. The connecting elbow 1, the corrugated drain pipe 2, the block 3 and the air inlet sealing block 4 cooperate to form a closed detection cavity, so as to ensure that the subsequent gas flows only in the cavity, thereby ensuring that the air pressure in the detection cavity can be established according to the preset requirement of the air tightness detector 7.

[0031] In the case of constructing the above detection cavity, the connecting elbow 1, the corrugated drain pipe 2, the block 3 and the air inlet sealing block 4 can be put into a container, and water is added into the container until the connecting elbow 1, the corrugated drain pipe 2, the block 3 and the air inlet sealing block 4 are completely submerged. After the gas inlet end of the air tightness detector 7 supplies gas into the detection cavity, whether there is bubble in the container is observed, so as to determine whether the corrugated drain pipe 2 has a leakage phenomenon.

[0032] Since the air tightness of the corrugated drain pipe 2 is directly judged by the above method, the detection result obtained is too inaccurate, therefore, the application is provided with a secondary bend 8 on the connecting bend 1, the secondary bend 8 is in communication with the connecting bend 1, the end of the secondary bend 8 away from the connecting bend 1 is connected with a gas guide pipe 9 in communication, the gas guide pipe 9 is connected with the sensor module of the air tightness detector 7 in communication through a pipe connection structure; the secondary bend 8 is used as a connecting channel of the detection cavity and the external detection components, so that the air pressure environment in the detection cavity can be synchronously transmitted to the subsequent detection module, avoiding the direct hole opening on the connecting bend 1 or the corrugated drain pipe 2 to damage the original sealing structure; the sensor module of the air tightness detector 7 includes an absolute pressure sensor and a temperature sensor, the pressure sensor is used for detecting the pressure in the detection cavity within the preset pressure maintaining time, if the pressure in the detection cavity is always kept unchanged or the change amount is within the qualified range within the pressure maintaining time, it is determined that the air tightness of the corrugated drain pipe 2 is up to standard, if the pressure in the detection cavity changes greatly within the pressure maintaining time, it is determined that the air tightness of the corrugated drain pipe 2 is not up to standard, the temperature sensor is used for detecting the environmental temperature, since the gas pressure will change with the temperature, the detection data of the temperature sensor can be used for temperature compensation of the pressure detection result of the absolute pressure sensor, avoiding the detection error caused by the environmental temperature fluctuation.

[0033] In addition, the absolute pressure sensor in the air tightness detector 7 can also be replaced with a differential pressure sensor according to the requirement, and correspondingly, if the differential pressure sensor is selected, a vacuum standard cavity with standard air pressure is arranged inside the air tightness detector 7, and whether the air tightness of the corrugated drain pipe 2 is up to standard is determined by analyzing the pressure difference between the pressure in the detection cavity and the pressure in the vacuum standard cavity.

[0034] The pipe connection structure includes a matching connecting block 10, a through communication channel 11 is formed in the matching connecting block 10, one end of the matching connecting block 10 is connected with the gas guide pipe 9 away from the secondary bend 8 in sealed communication through the communication channel 11 and the sealed gas pipe 6, the other end of the matching connecting block 10 is connected with the sensor module of the air tightness detector 7 in communication through the communication channel 11 and the sealed gas pipe 6; the matching of the matching connecting block 10, the communication channel 11, the sealed gas pipe 6 and the sensor module of the air tightness detector 7 can accurately transmit the converted air pressure parameters to the sensor module, so that the air pressure data detected by the sensor module is consistent with the actual air pressure in the closed cavity.

[0035] The connecting elbow 1 is a variable-diameter elbow, and the port at the end of the connecting elbow 1 with a larger radius is defined as the anti-disengagement interface 12, and the port at the end of the connecting elbow 1 with a smaller radius is defined as the connecting interface 13; the inner wall of the anti-disengagement interface 12 is provided with anti-disengagement friction-increasing lines; in the assembled state, the air inlet sealing block 4 is in sealing connection with the anti-disengagement interface 12, and the corrugated drain pipe 2 is in sealing connection with the connecting interface 13; after the gas conveying end of the gas tightness detector 7 conveys gas into the connecting elbow 1 through the air inlet sealing block 4, the anti-disengagement friction-increasing lines can prevent the air inlet sealing block 4 from disengaging from the connecting elbow 1.

[0036] More specifically, for the corrugated drain pipe 2, since it is a corrugated pipe structure, the pipe diameter at each position thereof changes periodically along the length direction thereof, and the pipe wall at the position with the smallest diameter is defined as a wave trough, and the pipe wall at the position with the largest radius is defined as a wave crest; if it is assumed that the rigidity of the corrugated drain pipe 2 is constant, the size of the cross section in the pipe changes periodically and alternately; in the actual situation, since the detection cavity is a closed cavity, the corrugated drain pipe 2 will deform along the axis thereof under the action of the gas pressure, and this deformation will cause the distance between two adjacent wave crests on the corrugated pipe 2 to increase, that is, the wave crest is gradually compressed in the radial direction under the axial tension, and the wave trough is gradually stretched in the radial direction under the axial thrust, until the pipe body of the corrugated drain pipe 2 approaches a straight pipe body in the limit state, that is, the radius difference between the wave crest and the wave trough tends to be zero; of course, this limit state basically does not occur, so that the flow cross section of the gas in the corrugated drain pipe 2 is always in dynamic change, and this dynamic change of the cross section will cause two key problems: one is that when the gas flows in the pipe, the periodic resistance fluctuation is caused by the large and small cross section, and local turbulence is easy to form, resulting in uneven pressure distribution in the closed cavity; the other is that the cross section change will be accompanied by a slight volume fluctuation in the pipe (the volume reduced by the wave crest and the volume expanded by the wave trough cannot be completely offset), and if the connecting elbow is designed to be equal in diameter, the volume fluctuation will directly cause the gas pressure in the cavity to change dramatically, so in the present application, the radius of the end of the connecting elbow 1 away from the corrugated drain pipe 2 (i.e. the anti-disengagement interface 12) is designed to be larger, so as to increase the flow cross section in the connecting elbow 1 and expand the volume of the connecting elbow 1 itself, forming a "gas pressure buffer cavity"; on the one hand, the anti-disengagement interface 12 gas flows into the initial area of the closed detection cavity, and the cross-sectional area of the initial area is designed to be larger to reduce the flow rate of the gas and reduce the turbulence and resistance fluctuation generated when the gas flows in the corrugated drain pipe 2; on the other hand, the large volume can absorb the volume fluctuation caused by the deformation of the corrugated drain pipe 2, and avoid the false gas pressure fluctuation caused by the volume change.

[0037] But expanding the radius of the anti-disengagement interface 12 is not without defects. According to the principle of hydrostatics, the greater the pressure area, the greater the axial thrust on the component under the same gas pressure in the closed cavity. Therefore, when the gas enters the detection cavity, the axial thrust on the air inlet sealing block 4 is much greater than the thrust on the corrugated drain pipe 2 at the connecting interface 13, so the air inlet sealing block 4 is more prone to disengagement under the action of gas pressure, and therefore the fixing effect needs to be enhanced by the anti-disengagement friction pattern; the anti-disengagement friction pattern not only increases the friction force between the anti-disengagement interface 12 and the air inlet sealing block 4, so that the air inlet sealing block 4 can withstand greater axial thrust, but also further ensures the sealing state of the detection cavity, avoiding gas leakage due to slight movement of the air inlet sealing block 4.

[0038] A detection method of a washing machine drain pipe air tightness detection device, comprising the following steps:

[0039] Step one: sealably install the corrugated drain pipe 2, the air inlet sealing block 4 and the air guide pipe 9 on the connecting interface 13 of the connecting elbow 1, the anti-disengagement interface 12 and the end of the secondary elbow 8 away from the connecting elbow 1 respectively; thereby building the basic gas path framework required for detection, and ensuring that there is no leakage at the connection of each component during the building process, laying the foundation for the formation of the closed detection cavity and gas pressure transmission in the subsequent process;

[0040] Step two: sealably connect the plug 3 to the end of the corrugated drain pipe 2 away from the connecting elbow 1;

[0041] Step three: connect the end of the air guide pipe 9 away from the connecting elbow 1 and the matching connecting block 10 together through the sealed air pipe 6;

[0042] Step four: connect the air inlet channel 5 on the air inlet sealing block 4 and the communication channel 11 on the matching connecting block 10 to the gas delivery end and the sensor module of the air tightness detector 7 respectively through the sealed air pipe 6;

[0043] Step five: deliver gas into the connecting elbow 1 through the gas delivery end of the air tightness detector 7;

[0044] Step six: the gas pressure environment formed in the connecting elbow 1 in step five is transmitted to the sensor module of the air tightness detector 7 through the secondary elbow 8, the air guide pipe 9, the sealed air pipe 6 and the matching connecting block 10 in turn, and the sensor module can detect the gas pressure parameter and the pressure maintaining time in the connecting elbow 1; if the detection result of the sensor module is the same as the preset structure, it is determined that the air tightness of the corrugated drain pipe 2 is qualified, otherwise it is not qualified.

[0045] The above is the first embodiment of the present application, in which, although the components of the first embodiment can detect the air tightness of the corrugated drain pipe 2 after being assembled together, the detection result only relies on the detection structure of the sensor module in the air tightness detector 7, but whether the air tightness detector 7 itself is faulty cannot be determined, such as the failure of each sensor in the sensor module of the air tightness detector 7, or the existence of a broken internal air path pipeline in the air tightness detector 7, thereby causing leakage during the detection process, and finally leading to inaccurate detection results. In addition, the gas delivery end and the sensor module of the air tightness detector 7 are connected by the sealed gas pipe 6 and other components only when they are needed to be used. During the connection process, it cannot be guaranteed that there is no gap between the sealed gas pipe 6 and the corresponding parts on the air tightness detector 7, so as to achieve complete sealing, thereby also leading to inaccurate final detection results. Moreover, although the laundry machine corrugated drain pipe air tightness detection method proposed by the present application needs fewer components, it is necessary to ensure that the components are not damaged, but the first embodiment does not have a related design for this. In view of the above problems, the second embodiment of the present application is proposed,

[0046] As shown in Figures 6-7 In the second embodiment, a storage box is further included, which can store all detection components to avoid damage caused by collision or scattering in a non-detection state. A detection platform 14 is arranged in the storage box. When the storage box is unfolded, the detection platform 14 is a horizontal platform, thereby providing a flat and stable operation platform for the detection process and reducing the interference of the external environment on the detection. A fixing area 15 and a guide area 16 are arranged on the detection platform 14. A plurality of clamping blocks 17 are arranged in the fixing area 15, and a guide structure 18 is arranged in the guide area 16. In the assembled state, the connecting elbow pipe 1 is clamped and fixed in the fixing area 15 by the clamping blocks 17. The clamping blocks 17 of the fixing area 15 are limitedly matched with the outer surface of the connecting elbow pipe 1, thereby limiting the connecting elbow pipe 1 from deviating or shaking in the initial stage of inputting gas by the gas delivery end of the air tightness detector 7 due to gas inflation. The corrugated drain pipe 2 and the blocking block 3 are connected with the guide structure 18 in the guide area 16. After the gas delivery end of the air tightness detector 7 delivers gas to the connecting elbow pipe 1 through the gas inlet sealing block 4, the corrugated drain pipe 2 will be elongated along its own axis under the action of gas pressure and move with the blocking block 3 in the guide area 16. The guide structure 18 can guide the movement of the corrugated drain pipe 2 and the blocking block 3. The guide structure 18 cooperates with the corrugated drain pipe 2 and the blocking block 3 to prevent the corrugated drain pipe 2 from deviating or twisting in the radial direction when it is elongated, and to ensure that the corrugated drain pipe 2 always deforms along the length direction of the guide area 16.

[0047] It should be emphasized that, as Figure 7As shown, the card block 17 shown in the second embodiment of the present application is only the simplest limit post, and the guide structure 18 is only the simplest cooperation of guide rod and sleeve block. Those skilled in the art have every reason to design other structures for the purpose of improving the fixing firmness and guiding accuracy, and such extension design shall also belong to the protection scope of the present application without changing the principle.

[0048] The laser ranging module 19 and the image detection module 20 are arranged on one side of the guide area 16, and the distance between the laser ranging module 19 and the guide area 16 is smaller than the distance between the image detection module 20 and the guide area 16. The laser ranging module 19 comprises a plurality of laser sensors 21 arranged along the length direction of the guide area 16, and each laser sensor 21 can rotate relative to the detection platform 14, so that the laser sensor 21 can be flexibly adjusted in angle relative to the detection platform 14. The image detection module 20 can detect and identify the shape of the corrugated drain pipe 2 in the guide area 16, and guide the laser emitted by each laser sensor 21 in the laser ranging module 19 to correspond to each wave crest of the corrugated drain pipe 2. The image detection module 20 can identify the shape of the corrugated drain pipe 2 in real time, and dynamically adjust the angle of the laser sensor 21, so as to ensure that the laser is always accurately aligned with the wave crest of the corrugated drain pipe 2, thereby ensuring that the one-to-one correspondence relationship between the laser and the wave crest will not be damaged due to the elongation of the corrugated drain pipe 2. After the whole system reaches a stable state, the laser ranging module 19 can detect the elongation length of the corrugated drain pipe 2 and the distance between the two adjacent wave crests.

[0049] More specifically, since the communication is provided between the connecting elbow 1 and the corrugated drain pipe 2, when the gas input end of the air tightness detector 7 inputs gas into the connecting elbow 1, the internal pressure of the connecting elbow 1 and the corrugated drain pipe 2 is consistent. When the pressure is stable, the distance between the two adjacent wave crests of the corrugated drain pipe 2 should be the same. If the laser ranging module 19 detects that the distance between two adjacent wave crests is different from other detection results, it can be determined that there is a leak in the peak body structure or the peak valley structure between the two wave crests. At the same time, since the corrugated drain pipe 2 has certain elastic properties, when it is filled with gas, the corrugated structure will form a unique balance state under the axial action of the internal gas pressure. That is, for each gas environment with a certain pressure intensity formed in the connecting elbow 1, there is a unique distance between the two adjacent wave crests of the corrugated drain pipe 2 corresponding to it. The pressure intensity in the connecting elbow 1 is ultimately detected by the sensor module in the air tightness detector 7. Therefore, during the detection process, the detection result of the laser ranging module 19 should correspond to the detection result of the air tightness detector 7. If the deviation between the detection result of the laser ranging module 19 and the detection result of the air tightness detector 7 is too large, it means that the air tightness of the corrugated drain pipe 2 does not meet the standard.

[0050] The guide area 16 is provided with a baffle 22 away from one side of the fixed area 15, the baffle 22 is fixed with a pressure sensor on the side close to the fixed area 15, and the baffle 22 is provided with a compression spring 23 on the side close to the fixed area 15, in the assembled state, one end of the compression spring 23 presses on the pressure sensor, and the other end presses on the end of the blocking block 3 away from the connecting elbow pipe 1, when the gas conveying end of the air tightness detector 7 conveys gas into the connecting elbow pipe 1 through the air inlet sealing block 4, the pressure sensor can detect the pressure applied by the blocking block 3 to the compression spring 23; because the connecting elbow pipe 1 is in communication with the corrugated drain pipe 2, the pressure in the connecting elbow pipe 1 and the corrugated drain pipe 2 is always the same, the gas in the corrugated drain pipe 2 tends to elongate along the axis of the corrugated drain pipe 2, thereby pushing the blocking block 3 to generate a force on the compression spring 23, and the force is equal to the pressure in the corrugated drain pipe 2; because the forces on both ends of the compression spring 23 are equal, the force of the blocking block 3 on the compression spring 23 is transmitted to the pressure sensor through the compression spring 23, so the pressure detected by the pressure sensor is the same as the pressure in the corrugated drain pipe 2; because the sensor module of the air tightness detector 7 is connected to the inside of the connecting elbow pipe 1 through the sealed gas pipe 6, the matching connecting block 10, the gas guide pipe 9 and the secondary elbow pipe 8, the pressure detected by the sensor module of the air tightness detector 7 is the same as the pressure in the connecting elbow pipe 1, that is, the pressure detected by the pressure sensor on the baffle 22 should be the same as the pressure detected by the sensor module of the air tightness detector 7, thereby forming cross verification of the pressure data, and avoiding detection errors caused by faults of the air tightness detector 7 itself or sealing problems of the gas path.

[0051] In addition, in the second embodiment, the air tightness detection result of the corrugated drain pipe 2 should be the joint analysis result of the detection results of the sensor module of the air tightness detector 7, the laser ranging module 19 and the pressure sensor on the baffle 22, so as to comprehensively determine the air tightness of the corrugated drain pipe 2 and the reliability of the detection result:

[0052] If the detection results of the three match each other, that is, the pressure measured by the sensor module of the air tightness detector 7 and the pressure measured by the pressure sensor on the baffle 22 are the same, and the distance between adjacent wave crests measured by the laser ranging module 19 is the same, it indicates that the corrugated drain pipe 2 is air-tight and the detection system is normal;

[0053] If the pressure measured by the sensor module of the air tightness detector 7 and the pressure measured by the pressure sensor on the baffle 22 are the same, but the distance between adjacent wave crests measured by the laser ranging module 19 is different, or the distance between adjacent wave crests does not match the pressure, it indicates that the corrugated drain pipe 2 has local leakage, resulting in abnormal local deformation of the corrugated drain pipe 2;

[0054] If the pressure measured by the sensor module of the air tightness detector 7 matches the adjacent peak distance measured by the laser distance measuring module 19, and each adjacent peak distance is the same, but the pressure measured by the pressure sensor on the baffle 22 is different from the pressure measured by the sensor module of the air tightness detector 7, it may be that the pressure sensor is faulty, the compression spring 23 is ineffective, or the sealing connection between the block 3 and the corrugated drain pipe 2 is loose, so that part of the air pressure is not transmitted to the block 3;

[0055] If the pressure measured by the pressure sensor on the baffle 22 matches the adjacent peak distance measured by the laser distance measuring module 19, and each adjacent peak distance is the same, but the pressure measured by the sensor module of the air tightness detector 7 is different from the pressure measured by the pressure sensor on the baffle 22, it means that the air tightness detector 7 itself has a fault (such as an abnormal internal sensor or a damaged internal pipe), or there is a leak in the gas path connection between the air tightness detector 7 and the air inlet sealing block 4 and the air guide pipe 9;

[0056] If none of the above results match, there may be multiple problems, such as a leak in the corrugated drain pipe 2 accompanied by a fault in the air tightness detector 7, and each component and connection state needs to be checked one by one.

[0057] It should be emphasized here that in the second embodiment of the present application, for each gas environment of a certain pressure intensity formed in the connecting elbow 1, there is only one unique distance between the two adjacent peaks of the corrugated drain pipe 2, and this unique distance should be a very small distance range, not a fixed value, because the distance between the two peaks is not only related to the material and structural characteristics of the corrugated drain pipe 2 itself, but also related to the resistance generated by the guide structure 18 during the elongation of the corrugated drain pipe 2 and the reaction force of the compression spring 23, so in reality, this distance should be a very small distance range, not a fixed value.

[0058] The above is the preferred embodiment of the present application, it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, can also make a number of improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A device for detecting the airtightness of a washing machine drain pipe, characterized in that: It includes a connecting bend (1), a corrugated drain pipe (2), a plug (3), and an air inlet sealing block (4); the corrugated drain pipe (2) and the air inlet sealing block (4) are respectively sealed and connected to both ends of the connecting bend (1), the plug (3) is sealed and connected to the end of the corrugated drain pipe (2) away from the connecting bend (1), and the air inlet sealing block (4) has a through air inlet channel (5), and the end of the air inlet channel (5) away from the connecting bend (1) is sealed and connected to the air supply end of the air tightness tester (7) through a sealed air pipe (6).

2. The airtightness testing device for a washing machine drain pipe according to claim 1, characterized in that: A secondary bend (8) is provided on the connecting bend (1). The secondary bend (8) is connected to the connecting bend (1). The end of the secondary bend (8) away from the connecting bend (1) is connected to a gas guide pipe (9). The gas guide pipe (9) is connected to the sensor module of the air tightness tester (7) through a pipe fitting connection structure.

3. The airtightness testing device for a washing machine drain pipe according to claim 2, characterized in that: The pipe connection structure includes a mating connection block (10), on which a through-through communication channel (11) is provided. One end of the mating connection block (10) is sealed and connected to the end of the air guide pipe (9) away from the secondary bend pipe (8) through the communication channel (11) and the sealing air pipe (6). The other end of the mating connection block (10) is connected to the sensor module of the air tightness tester (7) through the communication channel (11) and the sealing air pipe (6).

4. The airtightness testing device for a washing machine drain pipe according to claim 1, characterized in that: The connecting bend (1) is a variable diameter bend. The port at the larger radius end of the connecting bend (1) is called the anti-detachment interface (12), and the port at the smaller radius end is called the connecting interface (13). The inner wall of the anti-detachment interface (12) is provided with anti-detachment friction-increasing texture. In the assembled state, the air inlet sealing block (4) is sealed to the anti-detachment interface (12), and the corrugated drain pipe (2) is sealed to the connecting interface (13). When the air tightness tester (7) delivers gas to the connecting bend (1) through the air inlet sealing block (4), the anti-detachment friction-increasing texture can prevent the air inlet sealing block (4) from detaching from the connecting bend (1).

5. The airtightness testing device for a washing machine drain pipe according to claim 1, characterized in that: It also includes a storage box, in which a testing platform (14) is provided. The testing platform (14) is provided with a fixed area (15) and a guide area (16). The fixed area (15) is provided with several locking blocks (17), and the guide area (16) is provided with a guide structure (18). In the assembled state, the connecting bend (1) is clamped and fixed in the fixed area (15) by the locking blocks (17). The corrugated drain pipe (2) and the block (3) are in the guide area (16) and are connected with the guide structure (18). When the gas supply end of the air tightness tester (7) supplies gas to the connecting bend (1) through the air inlet sealing block (4), the corrugated drain pipe (2) will extend along its own axis under the action of air pressure and move in the guide area (16) with the block (3). The guide structure (18) can guide the movement of the corrugated drain pipe (2) and the block (3).

6. The airtightness testing device for a washing machine drain pipe according to claim 5, characterized in that: A laser ranging module (19) and an image detection module (20) are provided on one side of the guide area (16). The laser ranging module (19) includes several laser sensors (21) arranged along the length of the guide area (16), and each laser sensor (21) can rotate relative to the detection platform (14). The image detection module (20) can detect and identify the shape of the corrugated drainage pipe (2) in the guide area (16), and guide the laser emitted by each laser sensor (21) in the laser ranging module (19) to correspond one-to-one with each wave peak of the corrugated drainage pipe (2). After the entire system reaches a stable state, the laser ranging module (19) can detect the elongation length of the corrugated drainage pipe (2) and the distance between two adjacent wave peaks.

7. The airtightness testing device for a washing machine drain pipe according to claim 5, characterized in that: A baffle (22) is provided on the side of the guide area (16) away from the fixed area (15). A pressure sensor is fixed on the side of the baffle (22) close to the fixed area (15), and a compression spring (23) is provided on the side of the baffle (22) close to the fixed area (15). In the assembled state, one end of the compression spring (23) presses against the pressure sensor, and the other end presses against the end of the block (3) away from the connecting bend (1). When the gas supply end of the air tightness tester (7) supplies gas to the connecting bend (1) through the air inlet sealing block (4), the pressure sensor can detect the pressure applied by the block (3) to the compression spring (23).

8. The detection method of the airtightness detection device for a washing machine drain pipe according to claim 4, characterized in that: Includes the following steps: Step 1: Install the corrugated drain pipe (2), air inlet sealing block (4) and air guide pipe (9) in a sealed manner on the connection interface (13), anti-detachment interface (12) of the connecting bend (1) and the end of the secondary bend (8) away from the connecting bend (1) respectively; Step 2: Connect the plug (3) to the end of the corrugated drain pipe (2) away from the connecting bend (1) in a sealed manner; Step 3: Connect the end of the air guide tube (9) away from the connecting bend (1) to the mating connecting block (10) through the sealed air tube (6); Step 4: Through the sealed air pipe (6), connect the air intake channel (5) on the air intake sealing block (4) and the connecting channel (11) on the mating connecting block (10) to the air supply end and sensor module of the air tightness tester (7) respectively; Step 5: Gas is supplied to the connecting bend (1) through the gas supply end of the air tightness tester (7); Step 6; The air pressure environment formed in the connecting bend (1) in step 5 will be transmitted to the sensor module of the air tightness tester (7) through the secondary bend (8), the air guide pipe (9), the sealing air pipe (6) and the mating connecting block (10) in sequence. The sensor module can detect the air pressure parameters and pressure holding time in the connecting bend (1). If the detection result of the sensor module is the same as the preset structure, the air tightness of the corrugated drain pipe (2) is qualified; otherwise, it is unqualified.

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