Roller washing machine

Abstract

The embodiment of the invention provides a roller washing machine. The drum washing machine includes: a cabinet; the outer barrel is arranged in the box body, and the roller is connected with the outer barrel; the shock absorber is arranged between the outer barrel and the box body; the pressure detection assembly is used for detecting the value of the pressure borne by the roller or the value of the pressure borne by the shock absorber; the motor is used for providing power to drive the roller to work; the controller is electrically connected with the motor and the pressure detection assembly, and the controller is configured to execute the following steps that the motor controls the roller to work at the preset dewatering rotating speed lower than the highest dewatering rotating speed, and the maximum pressure value detected by the pressure detection assembly is obtained; if the maximum pressure value is below the preset pressure limit value, the motor controls the roller to work at the dewatering rotating speed below the maximum dewatering rotating speed. Therefore, the outer barrel can be prevented from impacting the box body in the dewatering process.

Description

Technical Field

[0001] The present application relates to the technical field of washing machines, and in particular to a drum washing machine. Background Art

[0002] A drum washing machine is a household washing machine with a cylindrical structure. It uses a combination of rolling motion and water to effectively wash clothes. When a drum washing machine is running a dehydration program, the outer drum often hits the cabinet. In order to prevent the outer drum from hitting the cabinet, the industry currently uses the speed fluctuation value of the brushless DC motor at a preset speed to infer the eccentricity of the clothes in the drum, and then determines whether the washing machine is allowed to perform the dehydration action at the highest speed based on the size of the eccentricity.

[0003] However, this technology is very complicated and susceptible to external interference. Moreover, under the same eccentricity, different layouts of the clothes in the drum will generate different forces on the outer drum, so it is still impossible to effectively ensure that the outer drum will not hit the box.

[0004] Therefore, there is an urgent need for a drum washing machine that can ensure that the outer drum does not hit the cabinet during the dehydration process. Summary of the invention

[0005] In order to solve the above technical problems, an embodiment of the present application provides a drum washing machine.

[0006] According to one aspect of an embodiment of the present application, the embodiment of the present application provides a drum washing machine, comprising: a housing; an outer barrel arranged in the housing, and a drum connected to the outer barrel; a shock absorber arranged between the outer barrel and the housing; a pressure detection component, used to detect the pressure value of the drum or the pressure value of the shock absorber; a motor, used to provide power to drive the drum to work; a controller, electrically connected to the motor and the pressure detection component, respectively, and the controller is configured to perform the following steps: controlling the drum to operate at a preset dehydration speed lower than the maximum dehydration speed through the motor, and obtaining the maximum pressure value detected by the pressure detection component; if the maximum pressure value is below the preset pressure limit, controlling the drum to operate at a dehydration speed below the maximum dehydration speed through the motor.

[0007] In the above embodiment, the motor is used to control the drum to operate at a preset spin speed lower than the maximum spin speed, and the maximum pressure value detected by the pressure detection component is obtained during the operation of the drum at the preset spin speed. If the detected maximum pressure value is below the preset pressure limit, it indicates that in the current state, the drum can operate at the highest spin speed to avoid the outer drum from hitting the housing. Compared with the huge external interference caused by the use of the size of the eccentricity for judgment in the prior art, the external interference caused by the use of the maximum pressure value detected by the pressure detection component for judgment is very small. Therefore, when the motor is used to control the drum to operate at a spin speed lower than the maximum spin speed, it can effectively ensure that the outer drum of the drum washing machine will not hit the housing during the spin process.

[0008] In one embodiment of the present application, based on the above technical solution, the pressure detection component includes a shock absorbing pressure sensor connected to the shock absorber.

[0009] In the above embodiment, a shock-absorbing pressure sensor connected to the shock absorber is used to detect the maximum pressure value received by the shock absorber through the shock-absorbing pressure sensor. If the maximum pressure value received by the shock absorber is below the preset pressure limit, it indicates that in the current state, the drum can avoid the outer drum from hitting the housing even if it operates at the highest dehydration speed. Compared with the huge external interference caused by the eccentricity used in the prior art, the external interference caused by the maximum pressure value detected by the shock-absorbing pressure sensor is very small. Therefore, when the motor controls the drum to operate at a dehydration speed below the maximum dehydration speed, it can effectively ensure that the outer drum of the drum washing machine will not hit the housing during the dehydration process.

[0010] In one embodiment of the present application, based on the above technical solution, the preset pressure limit is a first pressure limit, and the first pressure limit is obtained through the following process: the motor controls the drum with the eccentric block to operate at the highest dehydration speed, so that the outer barrel is in contact with the box body and the box body is not subjected to force; after the drum with the eccentric block is operated from the highest dehydration speed to the preset dehydration speed, the first pressure limit is determined according to the pressure value detected by the shock absorbing pressure sensor.

[0011] In the above embodiment, the drum is controlled by a motor to operate at the highest dehydration speed, and the eccentric block is placed in the drum so that the outer barrel is in contact with the box body but the box body is not subjected to force when the drum operates at the highest dehydration speed. Subsequently, the motor is used to reduce the speed of the drum with the eccentric block from the highest dehydration speed to a preset dehydration speed, and the first pressure limit is accurately determined based on the pressure value detected by the shock-absorbing pressure sensor when the drum operates at the preset dehydration speed.

[0012] In one embodiment of the present application, based on the above technical solution, the first pressure limit value does not exceed the pressure value detected by the shock absorbing pressure sensor.

[0013] In one embodiment of the present application, based on the above technical solution, the pressure detection component also includes a roller pressure sensor connected to the roller.

[0014] In the above embodiment, a drum pressure sensor connected to the drum is used to detect the maximum pressure value of the drum through the drum pressure sensor. If the maximum pressure value of the drum is below the preset pressure limit, it indicates that in the current state, the drum can avoid the outer drum from hitting the housing even if it operates at the highest dehydration speed. Compared with the huge external interference caused by the eccentricity used in the prior art, the external interference caused by the maximum pressure value detected by the drum pressure sensor is very small. Therefore, when the motor controls the drum to operate at a dehydration speed below the maximum dehydration speed, it can effectively ensure that the outer drum of the drum washing machine will not hit the housing during the dehydration process.

[0015] In some embodiments of the present application, based on the above technical solution, the preset pressure limit is a second pressure limit, and the second pressure limit is obtained through the following process: controlling the drum with the eccentric block to operate at the highest dehydration speed through the motor, so that the outer barrel is in contact with the box body and the box body is not subjected to force; after reducing the drum with the eccentric block from the highest dehydration speed to the preset dehydration speed for operation, the second pressure limit is determined according to the pressure value detected by the drum pressure sensor.

[0016] In the above embodiment, the drum is controlled by a motor to operate at the highest dehydration speed, and the eccentric block is placed in the drum so that the outer barrel is in contact with the box body but the box body is not subjected to force when the drum operates at the highest dehydration speed. Subsequently, the motor is used to reduce the speed of the drum with the eccentric block from the highest dehydration speed to a preset dehydration speed, and the second pressure limit is accurately determined based on the pressure value detected by the drum pressure sensor when the drum operates at the preset dehydration speed.

[0017] In some embodiments of the present application, based on the above technical solution, the second pressure limit is greater than the first pressure limit.

[0018] In the above embodiment, since the drum of the drum washing machine is located inside the outer drum, the outer drum is located inside the casing, and the shock absorber is arranged between the outer drum and the casing, the pressure on the drum when the drum works at the same dehydration speed is greater than the pressure on the shock absorber. Therefore, the second pressure limit is set to be greater than the first pressure limit, so as to effectively ensure that the outer drum of the drum washing machine will not hit the casing during the dehydration process. Otherwise, there is still a risk of the outer drum hitting the casing during the dehydration process.

[0019] In some embodiments of the present application, based on the above technical solution, if the dehydration speed of the drum increases, it is detected that the pressure value applied to the drum increases; if the dehydration speed of the drum decreases, it is detected that the pressure value applied to the drum decreases.

[0020] In some embodiments of the present application, based on the above technical solution, the controller is also configured to perform the following steps: if the maximum pressure value reaches above the preset pressure limit, the drum washing machine is controlled to run a uniform distribution program so that the maximum pressure value is below the preset pressure limit.

[0021] In the above embodiment, if the maximum pressure value detected by the pressure detection component reaches above the preset pressure limit, it indicates that in the current state, the drum is operating at the highest dehydration speed, which will cause the outer drum to hit the casing. Therefore, it is necessary to control the drum washing machine to run a uniform distribution program so that the clothes in the drum are evenly distributed until the maximum pressure value detected by the pressure detection component is below the preset pressure limit.

[0022] In some embodiments of the present application, based on the above technical solution, the controller is also configured to perform the following steps: select a target dehydration gear from multiple preset dehydration gears, wherein the dehydration gear with the largest gear corresponds to the highest dehydration speed; and control the drum through the motor to operate at the dehydration speed corresponding to the target dehydration gear.

[0023] In the above embodiment, there are multiple pre-set spin gears, and the largest spin gear corresponds to the drum working at the highest spin speed. The appropriate target spin gear is selected according to user needs. After selecting the target spin gear, the motor controls the drum to work at the spin speed corresponding to the target spin gear, thereby ensuring that the outer drum of the drum washing machine will not hit the box body during the dehydration process while also meeting the user's different dehydration needs.

[0024] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0026] Figure 1 is a structural schematic diagram of a drum washing machine provided by an exemplary embodiment of the present application;

[0027] Figure 2 is a flowchart of steps that can be executed by a controller in a drum washing machine provided by an exemplary embodiment of the present application;

[0028] Figure 3 is a flowchart for obtaining a first pressure limit value provided by an exemplary embodiment of the present application;

[0029] Figure 4 is a flowchart for obtaining a second pressure limit value provided by an exemplary embodiment of the present application;

[0030] Figure 5 is a flowchart of executable steps of a controller in a drum washing machine provided by an exemplary embodiment of the present application;

[0031] Figure 6 It is a flowchart of executable steps of a controller in a drum washing machine provided by another exemplary embodiment of the present application. DETAILED DESCRIPTION

[0032] Here, exemplary embodiments will be described in detail, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are only examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0033] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0034] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0035] It should also be noted that the "multiple" mentioned in this application refers to two or more than two. "And / or" describes the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship.

[0036] The terms "first", "second", "third" and "fourth" etc. in the specification and claims of the present application and the drawings are used to distinguish different objects, rather than to describe a specific order. The terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0037] When a drum washing machine is running a dehydration program, the outer drum often hits the casing. In order to prevent the outer drum from hitting the casing, the industry currently uses the speed fluctuation value of a brushless DC motor at a preset speed to infer the eccentricity of the clothing in the drum, and then determines whether the washing machine is allowed to perform the dehydration action at the highest speed based on the size of the eccentricity.

[0038] However, this technology is very complicated and susceptible to external interference. Moreover, under the same eccentricity, different layouts of the clothes in the drum will generate different forces on the outer drum, so it is still impossible to effectively ensure that the outer drum will not hit the box.

[0039] In order to solve the above technical problems, the present application proposes a drum washing machine. Figure 1 Schematic diagram of the structure of a drum washing machine provided by an exemplary embodiment of the present application. Figure 1 As shown, the drum washing machine 100 includes a door 101, lifting ribs 102, a water level sensor 103, a shock absorber 104, a pressure detection component 105, a foot 106, a drain pump 107, a box body 108, a drum shaft 109, a motor 110, a drum 111, an outer barrel 112, a first drain pipe 113, a three-way valve 114, a water inlet valve 115, a water inlet pipe 116, a water inlet hole 117 and a second drain pipe 118.

[0040] It should be noted that, in practical applications, the structure of the drum washing machine can also be adjusted according to actual needs, for example, Figure 1 The drum washing machine shown in the figure is increased / reduced / replaced with corresponding parts, and the structure of the drum washing machine is not limited to Figure 1 The structure shown.

[0041] The various parts of the drum washing machine 100 will be introduced one by one below.

[0042] The door 101 is usually made of a strong transparent material or an opaque material and has a sealing property to prevent water and detergent from overflowing. Preferably, the door 101 is provided with a safety lock function. When the drum washing machine 100 is in operation, the door cannot be easily opened to ensure the safety of the user and the clothes in the drum 111.

[0043] The lifting ribs 102 are raised structures located inside the drum 111, which help to better mix the clothes with the detergent during the washing process to improve the washing effect on the clothes.

[0044] The water level sensor 103 is used to measure the water level in the drum 111, so as to stop water injection or start drainage when the water level in the drum 111 reaches a set water level. The water level sensor 103 can be a pressure sensor, an electronic sensor or a float sensor.

[0045] The shock absorber 104 is disposed between the outer tub and the housing, and is usually installed at the bottom of the drum washing machine to reduce the vibration and noise generated during the washing and drying process of the clothes, thereby ensuring that the drum washing machine can operate stably.

[0046] The pressure detection assembly 105 is used to detect the pressure exerted on the components in the drum washing machine 100. Different types of pressure sensors can be used according to the different components. For example, the pressure detection assembly 105 may include a shock-absorbing pressure sensor (105) and a drum pressure sensor (not shown). The shock-absorbing pressure sensor is connected to the shock absorber and is used to detect the pressure value exerted on the shock absorber 104. The drum pressure sensor is connected to the drum 111 and is used to detect the pressure value exerted on the drum 111.

[0047] The foot 106 is a foot structure located at the bottom of the drum washing machine 100, which can adjust the height of the drum washing machine 100, balance the drum washing machine 100 and reduce the vibration and noise generated by the drum washing machine 100 during operation.

[0048] The drainage pump 107 is installed at the bottom of the drum washing machine 100, and can be used to discharge the sewage generated during the washing process from the drum washing machine 100, and to discharge the water contained in the clothes during the dehydration process from the drum washing machine 100.

[0049] The housing 108 is the outer shell of the drum washing machine 100, and is used to fix and protect the internal components. The housing 108 is usually made of metal or plastic; the housing 108 is usually also provided with a control panel, which has buttons, knobs or a touch screen for the user to select the washing program, temperature, speed and other settings on the control panel.

[0050] The drum shaft 109 , a supporting structure of the drum 111 , is used to support the drum 111 to perform rotational motion and is usually made of solid metal to ensure the stability and durability of the drum 111 .

[0051] The motor 110 is the power source of the drum washing machine 100 and is responsible for providing power to drive the drum 111 to perform washing and dehydration operations. The motor 110 can adjust the rotation speed, rotation angle, rotation direction and rotation time of the drum 111 through a control circuit to adapt to different washing programs, dehydration programs and user needs.

[0052] The drum 111 is arranged inside the outer barrel 112 and connected to the outer barrel 112. It is usually made of stainless steel or plastic and is used to place and wash clothes. A washing tank and ribs are usually provided inside the drum 111 to clean clothes through friction and impact, which helps to improve the washing effect of the clothes.

[0053] The outer barrel 112 is usually made of stainless steel or high-strength plastic. When the drum 111 rotates, the outer barrel 112 can be used to stabilize the drum 111.

[0054] The first drain pipe 113 and the second drain pipe 118 are both used to drain water from the drum washing machine 100 .

[0055] The three-way valve 114 is a device for controlling the direction of water flow, usually including a valve and a plurality of connection ports, and is mainly used to switch the direction of water flow between the washing cycle and the drain cycle of the drum washing machine 100 .

[0056] The water inlet valve 115 is connected to a water supply pipe or a faucet and is used to control the water inlet into the drum 111; the water inlet valve 115 can control the opening and closing of the water flow and the temperature of the water.

[0057] The water inlet pipe 116 is a pipe for supplying water to the drum 111 .

[0058] The water inlet 117 , serving as a water source inlet of the drum washing machine 100 , is usually located at the back or side of the drum washing machine 100 .

[0059] The controller is electrically connected to the motor and pressure detection assembly, see Figure 2 , Figure 21 is a flowchart of steps that can be executed by a controller in a drum washing machine provided by an exemplary embodiment of the present application. The controller can be configured to execute the following S210-S220:

[0060] S210, controlling the drum to operate at a preset spin speed lower than the maximum spin speed through the motor, and obtaining a maximum pressure value detected by the pressure detection component;

[0061] S220: If the maximum pressure value is below the preset pressure limit, the motor is used to control the drum to operate at a dehydration speed below the maximum dehydration speed.

[0062] The following describes these two steps in detail respectively.

[0063] In S210, the maximum dehydration speed refers to the maximum rotation speed that the drum of the drum washing machine can reach during the dehydration process. The drum washing machine has a unique fixed maximum rotation speed, which is usually expressed in (rpm, revolutions per minute). Different types of drum washing machines differ in design and use, so the corresponding maximum dehydration speeds are often different, such as household drum washing machines, commercial drum washing machines, and industrial-grade drum washing machines. Among them, household drum washing machines focus on washing effects and gentle treatment of clothes, and their maximum dehydration speed is often between 800rpm-1600rpm; commercial drum washing machines focus on handling more washing tasks in a shorter time, generally referring to drum washing machines used in commercial places such as hotels and laundries, and their maximum dehydration speed can reach 2000rpm; industrial-grade drum washing machines focus on quickly and effectively handling a large number of washing tasks, generally drum washing machines used in large cleaning facilities, and their maximum dehydration speed can reach 3000rpm. The preset dehydration speed is lower than the maximum dehydration speed means that the preset dehydration speed is lower than the minimum dehydration speed.

[0064] The pressure detection component can be a shock-absorbing pressure sensor or a drum pressure sensor, wherein the shock-absorbing pressure sensor is connected to the shock absorber to detect the pressure value on the shock absorber; the drum pressure sensor is connected to the drum to detect the pressure value on the drum. The pressure on the drum is the resultant force of the clothes in the drum on the drum. The resultant force of the clothes on the drum is positively correlated with the dehydration speed of the drum, that is, if the dehydration speed of the drum increases, the resultant force of the clothes in the drum on the drum increases, and the pressure value detected on the drum also increases. If the dehydration speed of the drum decreases, the resultant force of the clothes in the drum on the drum decreases, and the pressure value detected on the drum also decreases. Specifically, the relationship between the resultant force of the clothes on the drum and the dehydration speed of the drum is as follows:

[0065]

[0066] Among them, ω0 represents the preset spin speed, and ω1 represents the maximum spin speed; It indicates the combined force of the clothes on the drum when the drum is working at the preset spin speed. It represents the resultant force of the clothes on the drum when the drum is working at the highest dehydration speed. In addition, when ω1 represents a dehydration speed greater than ω0, the above formula is also valid.

[0067] When the motor controls the drum to work at a preset spin speed, the clothes in the drum are constantly rotating, so the pressure on the shock absorber and the drum may be different at different times, and the detected pressure values ​​may also be different. In order to effectively ensure that the outer drum does not hit the box during the spin process, the maximum pressure value detected within the preset time period is selected and compared with the preset pressure value to prevent the outer drum from hitting the box at some time. For example, the maximum pressure value on the drum and the shock absorber is selected within 20 seconds.

[0068] In another exemplary embodiment, the pressure detection component may include a shock-absorbing pressure sensor and a roller pressure sensor. Weights are assigned to the pressure values ​​detected by the shock-absorbing pressure sensor and the roller pressure sensor respectively. The pressure values ​​after the weights are assigned are added to obtain a comprehensive pressure value. The maximum comprehensive pressure value detected within a preset time period is selected and the maximum comprehensive pressure value is used as the maximum pressure value.

[0069] Exemplarily, the weight ratio of the pressure value detected by the shock absorbing pressure sensor and the pressure value detected by the drum pressure sensor is set to 0.4:0.6. At the 1st second, the pressure value detected by the shock absorbing pressure sensor is f1, and the pressure value detected by the drum pressure sensor is F1, then the comprehensive pressure value is 0.4f1+0.6F1; at the 2nd second, the pressure value detected by the shock absorbing pressure sensor is f2, and the pressure value detected by the drum pressure sensor is F2, then the comprehensive pressure value is 0.4f2+0.6F2, and so on. The comprehensive pressure value corresponding to each time point in the preset time period is obtained and compared to obtain the maximum pressure value.

[0070] It should be noted that the maximum pressure value may be obtained by real-time detection within a preset time period, or may be obtained by periodically detecting at time points within a preset time period, for example, selecting a specific time point within 20 seconds with a period of 2 seconds.

[0071] From the above, it can be seen that by comprehensively considering the pressure value detected by the shock-absorbing pressure sensor and the pressure value detected by the drum pressure sensor using weight ratio, the determined maximum pressure value can be made more accurate, thereby more effectively ensuring that the outer drum of the drum washing machine will not hit the box during the dehydration process.

[0072] In S220, according to the different maximum pressure values ​​detected by the pressure detection component, there are corresponding preset pressure limits. For example, when the maximum pressure value is detected by the damping pressure sensor, the preset pressure limit is the first pressure limit; when the maximum pressure value is detected by the roller pressure sensor, the preset pressure limit is the second pressure limit; when the maximum pressure value is determined by the pressure value detected by the damping pressure sensor and the pressure value detected by the roller pressure sensor, the preset pressure limit may be a third pressure limit determined by the first pressure limit and the second pressure limit.

[0073] See also Figure 3 , Figure 3 : is a flowchart for obtaining a first pressure limit value provided by an exemplary embodiment of the present application, including the following S310-S320:

[0074] S310, controlling the drum with the eccentric block placed thereon to operate at the highest dehydration speed through a motor, so that the outer barrel contacts the box body and the box body is not subjected to force;

[0075] S320, after reducing the maximum dehydration speed of the drum on which the eccentric block is placed to a preset dehydration speed for operation, determine a first pressure limit value according to the pressure value detected by the shock-absorbing pressure sensor.

[0076] These two steps are described in detail below.

[0077] In S310, the eccentric block is a heavy block made of metal or other materials, and its shape and size may vary depending on the manufacturer and the design of the specific washing machine. It is usually placed on one side of the drum.

[0078] The motor controls the drum to operate at the highest dehydration speed, and the eccentric block placed in the drum changes the mass distribution in the drum, so that when the drum operates at the highest dehydration speed, the outer barrel and the box body are in contact but not subjected to force, ensuring that the outer barrel and the box body are in a critical equilibrium state.

[0079] In S320, after the drum with the eccentric block is placed is reduced from the highest dehydration speed to the preset dehydration speed, the damping pressure sensor detects the pressure value of the shock absorber when the drum is working at the preset dehydration speed. The pressure value detected by the damping pressure sensor often fluctuates up and down in a certain pressure value range in the actual process. For example, the pressure value range is 20N-25N. Although the drum is working at the preset dehydration speed, the pressure value detected by the damping pressure sensor can reach a minimum of 20N at some times, and the pressure value detected by the damping pressure sensor can reach a maximum of 25N at other times.

[0080] Therefore, the first pressure limit value may be determined based on the maximum pressure value detected by the shock absorbing pressure sensor, or based on the minimum pressure value detected by the shock absorbing pressure sensor, or based on both the maximum pressure value and the minimum pressure value detected by the shock absorbing pressure sensor.

[0081] In another exemplary embodiment, the first pressure limit does not exceed the pressure value detected by the shock absorbing pressure sensor. Similarly, it may include that the first pressure limit does not exceed the minimum pressure value detected by the shock absorbing pressure sensor, the first pressure limit does not exceed the maximum pressure value detected by the shock absorbing pressure sensor, and the first pressure limit does not exceed the comprehensive pressure value determined by the maximum pressure value and the minimum pressure value detected by the shock absorbing pressure sensor. It should be noted that the first pressure limit does not exceed the pressure value detected by the shock absorbing pressure sensor includes that the first pressure limit is equal to the pressure value detected by the shock absorbing pressure sensor.

[0082] Still taking the above embodiment as an example, the pressure value detected by the shock-absorbing pressure sensor fluctuates between 20N-25N. If the first pressure limit is determined according to the minimum pressure value, the first pressure limit can be determined as 18N or 20N; if the first pressure limit is determined according to the maximum pressure value, the first pressure limit can be determined as 22N or 25N; the maximum pressure value and the minimum pressure value are used to jointly determine the comprehensive pressure value, for example, the comprehensive pressure value is determined to be 22.5N by taking the average value, and the first pressure limit can be determined as 20N or 22.5N.

[0083] See also Figure 4 , Figure 4 : is a flowchart for obtaining a second pressure limit value provided by an exemplary embodiment of the present application, including the following S410-S420:

[0084] S410, controlling the drum with the eccentric block placed thereon to operate at the highest dehydration speed through a motor, so that the outer barrel contacts the box body and the box body is not subjected to force;

[0085] S420, after reducing the maximum dehydration speed of the drum with the eccentric block to a preset dehydration speed for operation, determine a second pressure limit value according to the pressure value detected by the drum pressure sensor.

[0086] These two steps are described in detail below.

[0087] In S410, similarly, the motor is used to control the drum to operate at the highest dehydration speed, and the mass distribution in the drum is changed by the eccentric block placed in the drum, so that when the drum operates at the highest dehydration speed, the outer barrel and the box body are in contact but not subjected to force, thereby ensuring that the outer barrel and the box body are in a critical equilibrium state.

[0088] In S420, after the drum with the eccentric block is placed is reduced from the highest dehydration speed to the preset dehydration speed, the drum pressure sensor detects the pressure value of the drum when the drum is working at the preset dehydration speed. The pressure value detected by the drum pressure sensor will also fluctuate up and down in a certain pressure value range in the actual process. For example, the pressure value range is 30N-35N. Although the drum is working at the preset dehydration speed, the pressure value detected by the drum pressure sensor may reach a minimum of 30N at some times, and a maximum of 35N at other times.

[0089] Therefore, the second pressure limit can also be determined based on the maximum pressure value detected by the drum pressure sensor, or based on the minimum pressure value detected by the drum pressure sensor, or the first pressure limit can be determined based on the maximum pressure value and the minimum pressure value detected by the drum pressure sensor.

[0090] Still taking the above embodiment as an example, the pressure value detected by the roller pressure sensor fluctuates between 30N-35N. If the second pressure limit is determined according to the minimum pressure value, the second pressure limit can be determined as 28N or 30N; if the second pressure limit is determined according to the maximum pressure value, the second pressure limit can be determined as 32N or 35N; the maximum pressure value and the minimum pressure value are used to jointly determine the comprehensive pressure value, for example, the comprehensive pressure value is determined to be 32.5N by taking the average value, and the second pressure limit can be determined as 30N or 32.5N.

[0091] It should be noted that since the structure of the drum washing machine is that the outer drum wraps the drum, and the shell wraps the outer drum, it can be concluded that when the drum is working at a preset dehydration speed, the pressure value detected by the drum sensor must be greater than the pressure value detected by the shock-absorbing pressure sensor, and the pressure value range detected by the drum sensor will be greater than the pressure value range detected by the shock-absorbing sensor, then the determined second pressure limit will inevitably be greater than the first pressure limit.

[0092] If the maximum pressure value detected during the actual operation of the drum washing machine is below the preset pressure limit, it indicates that in the current state, the drum can avoid the outer drum from hitting the cabinet even if it is operated at the highest spin speed. Therefore, when the motor controls the drum to operate at a spin speed below the highest spin speed, it can effectively ensure that the outer drum of the drum washing machine will not hit the cabinet during the spin process. It should be noted that operating at a spin speed below the highest spin speed includes operating at the highest spin speed.

[0093] In another exemplary embodiment, if the detected maximum pressure value reaches above the preset pressure limit, it indicates that in the current state, the drum is operating at the highest dehydration speed, which will cause the outer drum to hit the cabinet. Therefore, it is necessary to control the drum washing machine to run a uniform distribution program so that the clothes in the drum are evenly distributed until the detected maximum pressure value is below the preset pressure limit. When the detected maximum pressure value is below the preset pressure limit, it can effectively ensure that the outer drum of the drum washing machine will not hit the cabinet during the dehydration process.

[0094] See also Figure 5 , Figure 5 1 is a flowchart of executable steps of a controller in a drum washing machine provided by an exemplary embodiment of the present application, including the following S510-S530:

[0095] S510, the drum washing machine runs a uniform distribution program to uniformly distribute the clothes in the drum;

[0096] S520, controlling the drum to operate at a preset dehydration speed through the motor, and detecting a maximum pressure value through the shock absorber pressure sensor to determine whether the maximum pressure value is below a first pressure limit;

[0097] S530, controlling the drum to operate at a spin speed lower than the maximum spin speed through the motor.

[0098] These three steps are described in detail below.

[0099] The even distribution program of the drum washing machine includes but is not limited to shaking out, timed reversal, and adjusting the speed and vibration intensity. Shaking out means that the drum rotates at different speeds and directions to shake out and disperse the clothes in the drum washing machine to prevent the clothes from piling up in one place; timed reversal means that the drum rotates clockwise for a period of time and then switches to counterclockwise rotation to help disperse the clothes; adjusting the speed and vibration intensity means that the even distribution program starts with a lower speed and vibration intensity, and then increases the speed and vibration intensity to ensure that the clothes can be evenly distributed.

[0100] When the drum is operating at a preset dehydration speed, the maximum pressure value received by the shock absorber is detected by the shock absorbing pressure sensor, and it is determined whether the maximum pressure value received by the shock absorber is below the first pressure limit. If it is determined to be yes, the drum is controlled by the motor to operate at a dehydration speed below the maximum dehydration speed. If it is determined to be no, the drum washing machine continues to run the uniform distribution program.

[0101] See also Figure 6 , Figure 6It is a flowchart of executable steps of a controller in a drum washing machine provided by another exemplary embodiment of the present application, in which S520 is replaced by S620. During the operation of the drum at a preset dehydration speed, the maximum pressure value of the drum is detected by the drum pressure sensor, and it is determined whether the maximum pressure value of the drum is below the second pressure limit. If it is determined to be yes, the drum is controlled by the motor to operate at a dehydration speed below the maximum dehydration speed. If it is determined to be no, the drum washing machine continues to run the uniform distribution program.

[0102] In another exemplary embodiment, the control is further configured to perform the following steps:

[0103] Selecting a target spin gear from a plurality of preset spin gears, wherein the spin gear with the largest gear corresponds to the highest spin speed;

[0104] The motor controls the drum to work at a spin speed corresponding to the target spin gear.

[0105] These two steps are described in detail below.

[0106] There are multiple dehydration gear options pre-set in the drum washing machine, and different dehydration gears correspond to different dehydration speeds of the drum. Among them, the largest dehydration gear corresponds to the drum working at the highest dehydration speed.

[0107] Exemplarily, the drum washing machine can be set with a low-speed spin gear, a medium-speed spin gear and a high-speed spin gear, which are gear 1, gear 2 and gear 3 respectively. Gear 3 is the spin gear with the largest gear, corresponding to the drum working at the highest spin speed; in addition, the drum washing machine can also be set with a low-speed spin gear, a medium-speed spin gear and a high-speed spin gear, which are gear 3, gear 2 and gear 1 respectively. Gear 1 is the spin gear with the largest gear, corresponding to the drum working at the highest spin speed.

[0108] Select the appropriate target dehydration gear according to user needs and the characteristics of the clothes. If the user wants to dehydrate the clothes quickly, the user can select the dehydration gear with the largest gear. The motor controls the drum to work at the highest dehydration speed, thereby ensuring that the outer drum of the drum washing machine will not hit the box body during the dehydration process while also meeting the user's needs for efficient dehydration.

[0109] In addition, if the clothes cannot be used in the highest spin speed due to their characteristics, you can choose a low or medium spin speed. For example, wool clothes with a soft surface are easily overstretched due to high-speed rotation, resulting in deformation or damage, so they cannot be used in the highest spin speed; clothes with metal parts may collide with each other when they are spun at the highest spin speed, thereby damaging the fabric around the metal parts. Therefore, they are also difficult to use in the highest spin speed.

[0110] As can be seen from the above, the present embodiment provides a plurality of dehydration gears, and an appropriate target dehydration gear can be selected according to user needs and characteristics of the laundry, thereby improving the flexibility and applicability of the drum washing machine.

[0111] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the embodiments disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary technical means in the art that are not disclosed in the present application.

[0112] It should be understood that the above content is only a preferred exemplary embodiment of the present application and is not intended to limit the implementation scheme of the present application. A person skilled in the art can easily make corresponding changes or modifications based on the main concept and spirit of the present application. Therefore, the scope of protection of the present application shall be based on the scope of protection required by the claims.

Claims

1. A drum washing machine, It is characterized in that include: Box; An outer barrel disposed in the box body, and a drum connected to the outer barrel; A shock absorber is arranged between the outer barrel and the box body; A pressure detection component, used to detect the pressure value of the drum or the pressure value of the shock absorber; A motor, used for providing power to drive the drum to work; A controller is electrically connected to the motor and the pressure detection assembly, and the controller is configured to perform the following steps: Controlling the drum to operate at a preset spin speed lower than the maximum spin speed through the motor, and obtaining the maximum pressure value detected by the pressure detection component; If the maximum pressure value is below the preset pressure limit, the motor controls the drum to operate at a dehydration speed below the maximum dehydration speed.

2. The drum washing machine according to claim 1, It is characterized in that The pressure detection assembly includes a shock absorbing pressure sensor connected to the shock absorber.

3. The drum washing machine according to claim 2, It is characterized in that The preset pressure limit value is a first pressure limit value, and the first pressure limit value is obtained by the following process: The motor controls the drum on which the eccentric block is placed to operate at the highest dehydration speed, so that the outer barrel contacts the box body and the box body is not subjected to force; After the drum with the eccentric block placed thereon is operated by reducing the maximum dehydration speed to the preset dehydration speed, the first pressure limit value is determined according to the pressure value detected by the shock-absorbing pressure sensor.

4. The drum washing machine according to claim 3, It is characterized in that The first pressure limit value does not exceed the pressure value detected by the damping pressure sensor.

5. The drum washing machine according to claim 3, It is characterized in that The pressure detection assembly also includes a roller pressure sensor connected to the roller.

6. The drum washing machine according to claim 5, It is characterized in that The preset pressure limit value is a second pressure limit value, and the second pressure limit value is obtained by the following process: The motor controls the drum on which the eccentric block is placed to operate at the highest dehydration speed, so that the outer barrel contacts the box body and the box body is not subjected to force; After the drum with the eccentric block placed thereon is operated by reducing the maximum dehydration speed to the preset dehydration speed, the second pressure limit value is determined according to the pressure value detected by the drum pressure sensor.

7. The drum washing machine according to claim 6, It is characterized in that The second pressure limit is greater than the first pressure limit.

8. The drum washing machine according to claim 1, It is characterized in that If the dehydration speed of the drum increases, it is detected that the pressure value applied to the drum increases; if the dehydration speed of the drum decreases, it is detected that the pressure value applied to the drum decreases.

9. The drum washing machine according to claim 1, It is characterized in that The controller is further configured to perform the following steps: If the maximum pressure value reaches above the preset pressure limit, the drum washing machine is controlled to run a uniform distribution program so that the maximum pressure value is below the preset pressure limit.

10. The drum washing machine according to claim 1, It is characterized in that The controller is further configured to perform the following steps: Selecting a target spin gear from a plurality of preset spin gears, wherein the spin gear with the largest gear corresponds to the highest spin speed; The motor controls the drum to operate at a dehydration speed corresponding to the target dehydration gear.

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