A rotary valve designed to prevent jamming and its control method

Abstract

This application relates to a rotary valve and control method for preventing jamming during operation. The rotary valve includes: a rotary valve head with a cleaning inlet channel, a cleaning outlet channel, and a working channel; a stator installed inside the rotary valve head; the stator having a first channel communicating with the cleaning inlet, a second channel communicating with the cleaning outlet channel, and sub-channels corresponding to and communicating with the working channel; a rotor rotatably engaging with the stator; a cleaning groove in the middle of the rotor communicating with the first and second channels; an arc-shaped groove on the edge of the rotor communicating with two adjacent sub-channels; a motor connected to a rotating shaft; the rotating shaft connected to the rotor, and a first elastic element connected to the rotating shaft; and a cleaning assembly communicating with the cleaning inlet channel. This invention can clean impurities from the rotary valve and perform de-jamming treatment, ensuring that the rotary valve can start normally.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a rotary valve and control method for preventing suction jamming. Background Technology

[0002] Rotary cutting valves are mainly used to switch between different flow channels and are commonly used in medical equipment. The technology of rotary cutting valves, as described in CN119084606B, typically features an elastic element on the rotor to ensure a tight seal between the rotor and stator. Therefore, a certain pressure exists between the rotor and stator. On one hand, the rotor and stator, usually made of metal, plastic, or ceramic, are susceptible to friction, resulting in the formation of abrasive particles, debris, and crystallized reagents. When medical equipment is shut down for extended periods, these particles and crystals can easily enter the friction surfaces, causing jamming and step loss. In severe cases, this can lead to damage and render the medical equipment inoperable. On the other hand, during prolonged shutdowns or power outages, the contact surfaces of the stator and rotor may attract each other, causing the cutting torque to reach tens or hundreds of times the original torque. This can prevent the motor from turning the rotor, resulting in cutting failure.

[0003] Therefore, there is a need for a rotary cutting valve and control method that can clean up grinding debris and crystals, and prevent the stator and rotor from sticking together, which would lead to rotary cutting failure. Summary of the Invention

[0004] Therefore, it is necessary to provide a rotary valve and control method to prevent suction jamming, and the specific technical solution is as follows.

[0005] A rotary valve designed to prevent jamming and locking, comprising:

[0006] The rotary cutting valve head is provided with a cleaning inlet channel, a cleaning outlet channel, and a working channel; multiple working channels are arranged around the rotary cutting valve head; a safety valve is connected to the cleaning outlet channel.

[0007] The stator is installed inside the rotary valve head; the stator is provided with a first flow channel communicating with the cleaning inlet, a second flow channel communicating with the cleaning outlet flow channel, and sub-flow channels communicating with the working flow channels one by one.

[0008] The rotor rotates in conjunction with the stator; a cleaning groove is provided in the middle of the rotor, and the cleaning groove is connected to the first flow channel and the second flow channel; an arc-shaped groove is provided on the edge of the rotor, and the arc-shaped groove is connected to two adjacent sub-flow channels; and the cleaning groove and the arc-shaped groove are not connected to each other.

[0009] An electric motor is connected to a rotating shaft; the rotating shaft is connected to a rotor, and a first elastic element is connected to the rotating shaft, the first elastic element having elastic potential energy to drive the rotor to press against the stator;

[0010] The cleaning component is connected to the cleaning inlet channel and is used to inject cleaning medium into the cleaning inlet channel.

[0011] Furthermore, the cleaning assembly includes:

[0012] The pressure tank is connected to the cleaning inlet channel via a back pressure valve;

[0013] A pressure storage device, connected to a pressure storage tank, is used to inject cleaning media into the pressure storage tank and to maintain pressure in the tank.

[0014] Furthermore, the pressure storage device includes:

[0015] A cam mechanism is connected to a motor drive; the motor is a dual-axis stepper motor that synchronously drives the cam mechanism and the rotating shaft to rotate.

[0016] A push rod is movably mounted inside the housing along its axial direction; the push rod abuts against the cam mechanism, causing the push rod to move along its axial direction when the cam mechanism rotates;

[0017] A piston cylinder has an internal piston passage; an inlet check valve and an outlet check valve are connected to the piston cylinder; the piston passage is connected to a cleaning medium storage tank through the inlet check valve and to a pressure tank through the outlet check valve.

[0018] The piston rod is movably connected within the piston passage and is connected to the push rod.

[0019] Furthermore, a second elastic element is connected to the push rod, the second elastic element having elastic potential energy to drive the push rod to move away from the piston cylinder.

[0020] Furthermore, a three-way switching valve is provided between the back pressure valve and the cleaning inlet channel; one end of the three-way switching valve is connected to the back pressure valve, one end is connected to the cleaning inlet channel, and the other end is connected to the atmosphere.

[0021] Furthermore, a pressure sensor is provided at the end of the first elastic element away from the rotor.

[0022] A control method using the rotary valve described in any of the above claims includes the following steps:

[0023] Determine if the rotary valve has been idle for an extended period of time;

[0024] If the rotary valve is in a long-term idle state, then continue to determine whether the motor is in a step-loss state; if the motor is in a step-loss state, then perform step-loss correction on the motor; if the motor is not in a step-loss state, then further determine whether the rotary valve is in an idle state.

[0025] If the rotary valve is not in a long-term idle state, then further determine whether the rotary valve is in an idle state;

[0026] If the rotary valve is idle, perform a disengagement / engagement process;

[0027] If the rotary valve is not idle, it should be cleaned.

[0028] Furthermore, the process of step loss correction includes:

[0029] Connect the cleaning inlet channel to the cleaning assembly, and inject the cleaning medium into the cleaning inlet channel through the cleaning assembly;

[0030] The anti-sucking reverse pressure value is preset to P, P=50%*M, where M is the pressure value of the first elastic element detected by the pressure sensor.

[0031] Set the threshold of the safety valve to P, and gradually increase the pressure of the cleaning inlet flow channel until the pressure value of the safety valve reaches the threshold P.

[0032] After starting the motor and depressurizing the safety valve, check again whether steps have been lost.

[0033] If the step loss persists, increase the anti-clamping reverse pressure value by 10%*M each time, and repeat the step loss correction.

[0034] Furthermore, the de-adsorption process includes:

[0035] Connect the cleaning inlet channel to the cleaning assembly, and inject the cleaning medium into the cleaning inlet channel through the cleaning assembly;

[0036] The anti-sucking reverse pressure value is preset to P, P=50%*M, where M is the pressure value of the first elastic element detected by the pressure sensor.

[0037] Set the safety valve threshold to P, and gradually increase the pressure in the cleaning inlet channel until the safety valve pressure reaches the threshold P.

[0038] Furthermore, the cleaning inlet channel is connected to the cleaning assembly, and the cleaning medium is injected into the cleaning inlet channel through the cleaning assembly;

[0039] Set the maximum cleaning pressure to Q, where Q = (2 * EM) * 90%, and E is the factory-preset pressure value of the first elastic element.

[0040] Adjust the inlet flow channel pressure threshold to Q, and adjust the safety valve threshold to M*40%.

[0041] Beneficial effects: The anti-jamming rotary valve provided by the present invention reduces the contact area between the stator and rotor by setting a cleaning groove on the rotor, thereby reducing the vacuum adsorption pressure between the stator and rotor, thus reducing the rotary cutting torque after adsorption and reducing the reverse pressure required for de-adsorption; on the other hand, during the friction between the stator and rotor, the dust and crystals will move towards the hollow cleaning groove, and the cleaning medium will carry away the dust and crystals to achieve the purpose of cleaning.

[0042] The present invention provides a control method using a rotary valve. In the case of the rotary valve being idle, inactive, or missing steps, the cleaning pressure can be adjusted according to the pressure of the elastic element to perform disengagement and engagement, and step loss correction, thereby ensuring that the rotary valve can start normally, minimizing the entry of foreign objects into the friction surface, preventing the rotary valve from jamming, enabling unattended operation, greatly reducing the workload of medical equipment maintenance personnel, and improving work efficiency. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of the overall structure of the rotary valve;

[0045] Figure 2 This is a partial explosion diagram of a rotary valve;

[0046] Figure 3 This is a cross-sectional view of a rotary valve;

[0047] Figure 4 This is a schematic diagram of a rotary valve from another perspective;

[0048] Figure 5 A flowchart of the control method;

[0049] Figure 6 This is a flowchart of the overall control method.

[0050] Explanation of reference numerals in the attached diagram: 1. Rotation counting code disk; 2. Counting sensor; 3. Cam mechanism; 4. Push rod; 5. Motor; 6. Rotary cutting valve seat; 7. Rotary cutting valve head; 8. Safety valve; 9. Three-way switching valve; 10. Back pressure valve; 11. Controller; 12. Pressure tank; 13. Outlet end; 14. Piston cylinder; 15. Inlet end; 16. Reset code disk; 17. Step loss code disk; 18. Transmission pin; 19. Rotary shaft; 20. Pressure sensor; 21. Thrust bearing; 22. First elastic element; 23. Rotor; 24. Stator; 25. Sealing rubber; 26. Step loss sensor; 27. Zero position sensor; 28. Piston rod; 29. ​​Outlet check valve; 30. Inlet check valve; 31. Liquid inlet pipe; 32. First pressure relief pipe; 33. Outlet pipe; 34. Inlet pipe; 35. Second pressure relief pipe; 36. Cleaning groove; 37. Arc-shaped groove. Detailed Implementation

[0051] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0052] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0053] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0054] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0055] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0056] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0057] Example 1

[0058] Reference Figure 1 As shown, this embodiment provides a rotary valve to prevent suction jamming, including a rotary valve head 7, a stator 24, a rotor 23, a motor 5, and a cleaning assembly.

[0059] Specifically, refer to Figure 1 and Figure 2 As shown, the rotary valve head 7 is provided with a cleaning inlet channel, a cleaning outlet channel, and several working channels. The cleaning inlet channel is used to inject the cleaning medium, and the cleaning outlet channel is used to discharge the cleaning medium. A safety valve 8 is provided on the cleaning outlet channel to control the outlet pressure threshold. Several working channels are arranged around the rotary valve head 7, and different working channels are connected by switching the rotary valve. It should be noted that the cleaning medium can be a gaseous medium, a liquid medium, or a gas-liquid mixture, and can be driven by various methods such as acoustic wave drive, magnetic drive, electric field or ion wind drive, aerosol jet drive, and capillary action drive.

[0060] Specifically, the stator 24 is installed inside the rotary valve head 7. The stator 24 has a first flow channel communicating with the cleaning inlet, a second flow channel communicating with the cleaning outlet, and sub-flow channels corresponding to the working flow channels. The rotor 23 rotates with the stator 24, and a sealing rubber 25 is provided between the rotor 23 and the stator 24. The rotor 23 has a cleaning groove 36 in its middle, which communicates with the first and second flow channels; the rotor 23 has an arc-shaped groove 37 on its edge, which connects two adjacent sub-flow channels; and the cleaning groove 36 and the arc-shaped groove 37 are not interconnected. The cleaning medium injected through the cleaning inlet flow channel enters the cleaning groove 36 to clean the rotary valve, carrying away abrasive debris and crystals, which are discharged outwards from the cleaning outlet flow channel. The injected cleaning medium also provides reverse pressure for the rotor 23 and stator 24 to disengage, achieving the disengagement process. Two adjacent sub-channels are connected by an arc-shaped groove 37. By rotating the arc-shaped groove 37, the connection between different working channels can be switched.

[0061] Specifically, refer to Figure 3 As shown, the motor 5 is connected to a rotating shaft 19; the rotating shaft 19 is connected to the rotor 23, and the motor 5 drives the rotor 23 to rotate for cutting, switching between different working channels; and a first elastic element 22 is connected to the rotating shaft 19. The first elastic element 22 has elastic potential energy to drive the rotor 23 to press against the stator 24; the first elastic element 22 applies pressure to the rotor 23 to ensure the sealing between the stator 24 and the rotor 23. The first elastic element 22 can specifically be a wave spring. The rotor 23 and the stator 24 are both located inside the housing. The rotating shaft 19 has a T-shaped structure, so that the first elastic element 22 is sleeved on the rotating shaft 19, with one end connected to the rotating shaft 19 and the other end connected to the thrust bearing 21, which is mounted on the housing. The rotating shaft 19 is connected to the output shaft of the motor 5 through a transmission pin 18. The outer contour of the rotor 23 is square-cut, and the rotating shaft 19 has a matching square groove, so that the rotor 23 is inserted into the square groove and drives the rotating shaft 19. A rotary valve seat 6 is also connected below the rotary valve head, so that the output shaft and rotating shaft 19 of the motor 5 are located inside the valve seat.

[0062] Specifically, a step loss detection mechanism is also provided on the motor 5 to detect whether the motor 5 is in a step loss state. The step loss detection mechanism includes a reset encoder 16, a step loss encoder 17, a zero-position sensor 27, and a step loss sensor 26. The motor 5 is determined to be in a step loss state by detecting the reset encoder 16 and the step loss encoder 17 respectively. The specific detection method and installation method can adopt existing technology.

[0063] Specifically, the cleaning assembly is connected to the cleaning inlet channel and is used to inject cleaning medium into the cleaning inlet channel. The cleaning medium injected through the cleaning assembly cleans the wear debris and crystals, and controls the application of a reverse force to the rotor 23 for disengagement. The planar van der Waals force between the friction surfaces of the rotor 23 and the stator 24 is related to the contact area and the effective distance. By providing the cleaning groove 36, the contact area can be reduced. By injecting a cleaning medium with a certain pressure, a force can be applied to the stator 24 and the rotor 23 to move them away from each other, thereby increasing the effective distance microscopically. Reducing the contact area and increasing the effective distance both reduce the planar van der Waals force, making it easier for the rotor 23 and the stator 24 to disengage.

[0064] The present invention provides a rotary cutting valve to prevent suction jamming. By setting a cleaning groove 36 on the rotor 23, it reduces the contact area between the stator 24 and the rotor 23, thereby reducing the vacuum adsorption pressure between the stator 24 and the rotor 23, thus reducing the rotary cutting torque after suction and reducing the reverse pressure required for de-suction. On the other hand, during the friction between the stator 24 and the rotor 23, the dust and crystals will move towards the hollow cleaning groove 36, and the cleaning medium will carry away the dust and crystals to achieve the purpose of cleaning, ensuring that the rotary cutting valve can start normally and avoiding damage to the rotary cutting valve caused by dust and crystals.

[0065] Specifically, continue to refer to Figure 1 As shown, the cleaning assembly includes a pressure tank 12 and a pressure storage device. One end of the pressure tank 12 is connected to the cleaning inlet channel via a back pressure valve 10; the pressure storage device is connected to the pressure tank 12 and is used to inject cleaning medium into the pressure tank 12 and store pressure.

[0066] Specifically, continue to refer to Figure 3As shown, the pressure storage device includes a cam mechanism 3, a push rod 4, a piston cylinder 14, a piston rod 28, and a second elastic element. The cam mechanism 3 is connected to a motor 5, which is a dual-axis stepper motor 5, synchronously driving the cam mechanism 3 and the rotating shaft 19 to rotate. In this embodiment, the cam mechanism 3 can adopt a conventional cam structure in the prior art, so it will not be described in detail. The push rod 4 is movably installed in the housing along the axial direction; the push rod 4 abuts against the cam mechanism 3, so that when the cam mechanism 3 rotates, it drives the push rod 4 to move along its axial direction. The piston cylinder 14 has a piston channel inside, and an inlet check valve 30 and an outlet check valve 29 are connected to the piston cylinder 14. The inlet end 15 of the piston channel is connected to the cleaning medium storage tank through the inlet check valve 30, and the outlet end 13 is connected to the pressure tank 12 through the outlet check valve 29. The inlet check valve 30 only allows the cleaning medium to enter the piston cylinder 14 from the cleaning medium storage tank, and the outlet check valve 29 only allows the cleaning medium to enter the pressure tank 12 from the piston cylinder 14. The piston rod 28 is movably connected in the piston channel and connected to the push rod 4. The second elastic element has elastic potential energy to drive the push rod 4 to move away from the piston cylinder 14. During the operation of the rotary valve, the motor 5 drives the rotor 23 to rotate, which in turn drives the cam mechanism 3 to rotate. Specifically, the inlet check valve 30 is connected to the cleaning medium storage tank through the liquid inlet pipe 31.

[0067] When the cam mechanism 3 rotates to its larger end and abuts against the push rod 4, the push rod 4 drives the piston rod 28 to move in the direction of insertion into the piston cylinder 14. At this time, the inlet check valve 30 is closed and the outlet check valve 29 is open, allowing the cleaning medium to enter the pressure tank 12 from the piston cylinder 14, increasing the pressure in the pressure tank 12. When the cam mechanism 3 rotates to its smaller end and abuts against the push rod 4, the second elastic element drives the push rod 4 to move the piston rod 28 in the direction of disengagement from the piston cylinder 14, i.e., in the reverse direction. At this time, the inlet check valve 30 is opened and the outlet check valve 29 is closed, allowing the cleaning medium to enter the piston cylinder 14 from the cleaning medium storage tank.

[0068] Specifically, refer to Figure 4 As shown, a three-way switching valve 9 is provided between the back pressure valve 10 and the cleaning inlet channel. One end of the three-way switching valve 9 is connected to the back pressure valve 10 through the outlet pipe 33, the other end is connected to the cleaning inlet channel through the inlet pipe 34, and the third end is connected to the atmosphere through the first pressure relief pipe 32. The safety valve 8 is connected to the second pressure relief pipe 35. When step loss correction, disengagement, or cleaning is required, the three-way switching valve 9 is switched to connect the back pressure valve 10 to the cleaning inlet channel; when the rotary valve is working normally, the three-way switching valve 9 is switched to connect the back pressure valve 10 to the atmosphere.

[0069] Specifically, continue to refer to Figure 1As shown, the cam mechanism 3 is also connected to a rotation count code disk 1, and a counting sensor 2 is also connected to the housing. The number of rotations of the cam mechanism 3 is determined by the counting sensor 2 detecting the rotation count code disk 1, thereby determining the number of times the pressure tank 12 is pressurized.

[0070] Specifically, a pressure sensor 20 is provided at the end of the first elastic element 22 away from the rotor 23, specifically located between the thrust bearing 21 and the housing, for monitoring the pressure applied by the first elastic element 22.

[0071] Specifically, it also includes a controller 11, which is connected to the safety valve 8, the back pressure valve 10, the pressure sensor 20, etc., and is used to receive the detection results of the pressure sensor 20 and control the threshold values ​​of the safety valve 8 and the back pressure valve 10.

[0072] Example 2

[0073] Reference Figure 5 As shown, this embodiment provides a control method using the rotary valve in Embodiment 1, specifically including the following steps:

[0074] S1. Determine if the rotary valve has been idle for a long time;

[0075] S2. If the rotary valve is in a long-term idle state, then continue to determine whether the motor 5 is in a step-loss state; if the motor 5 is in a step-loss state, then perform step-loss correction on the motor 5; if the motor 5 is not in a step-loss state, then further determine whether the rotary valve is in an idle state.

[0076] S3. If the rotary valve is not in a long-term idle state, further determine whether the rotary valve is in an idle state.

[0077] S4. If the rotary valve is in an idle state, perform a disengagement / engagement process;

[0078] S5. If the rotary valve is not idle, it shall be cleaned.

[0079] The control method using a rotary valve provided in this embodiment can adjust the cleaning pressure according to the pressure of the elastic element when the rotary valve is in a state of long-term inactivity, idleness, or missed steps, thereby performing processes such as disengagement and engagement, and missed step correction, to ensure that the rotary valve can start normally, minimize the entry of foreign objects into the friction surface, prevent the rotary valve from jamming, realize unattended operation, greatly reduce the workload of medical equipment maintenance operators, and improve work efficiency.

[0080] Specifically, in step S1, it is determined whether the rotary valve is in a long-term idle state. This can be determined based on whether the rotary valve is being started for the first time after the power is turned on. If it is being started for the first time after the power is turned on, it is in a long-term idle state. If it is not being started for the first time after the power is turned on, it is not in a long-term idle state.

[0081] Specifically, in step S3, it is determined whether the rotary valve is in an idle state. This can be determined based on a preset value for the idle time of the rotary valve. In this embodiment, the preset value for the time limit is 2 hours. When the idle time of the rotary valve reaches 2 hours, it is determined that the rotary valve is in an idle state. When the idle time of the rotary valve does not reach 2 hours, it is determined that the rotary valve is not in an idle state.

[0082] Specifically, in step S2, the process of step loss correction includes:

[0083] S21. Connect the cleaning inlet channel to the cleaning assembly, and inject the cleaning medium into the cleaning inlet channel through the cleaning assembly.

[0084] S22. Set the anti-sucking reverse pressure value to P, P=50%*M, where M is the pressure value of the first elastic element 22 detected by the pressure sensor 20.

[0085] S23. Set the threshold of safety valve 8 to P, and gradually increase the pressure of the cleaning inlet flow channel, that is, gradually increase the pressure of back pressure valve 10 until the pressure value of safety valve 8 reaches the threshold P.

[0086] S24. After starting motor 5 and depressurizing safety valve 8, check again whether a step was lost.

[0087] S25. If the step loss still occurs, increase the anti-clamping reverse pressure value by 10%*M each time, and repeat the step loss correction.

[0088] In step S24, the controller 11 sets the motor 5 to start at low speed and high current. At this time, the torque is relatively large, which achieves the purpose of assisting disengagement from the starting position. Specifically, the drive current value of the motor 5 can be set to rated current * 100%, and the maximum speed value can be set to 5%.

[0089] Specifically, in step S4, the de-adsorption process includes:

[0090] S41. Connect the cleaning inlet channel to the cleaning assembly, and inject cleaning medium into the cleaning inlet channel through the cleaning assembly.

[0091] S42. Set the threshold of safety valve 8 to P, P=50%*M, where M is the pressure value of the first elastic element 22 detected by pressure sensor 20.

[0092] S43. Set the threshold of safety valve 8 to P, and gradually increase the pressure of the cleaning inlet flow channel, that is, gradually increase the pressure of back pressure valve 10 until the pressure value of safety valve 8 reaches the threshold P.

[0093] Specifically, in step S5, the cleaning process includes:

[0094] S51. Connect the cleaning inlet channel to the cleaning assembly, and inject cleaning medium into the cleaning inlet channel through the cleaning assembly;

[0095] S52. Set the maximum cleaning pressure to Q, Q = (2 * EM) * 90%, where E is the pressure value of the first elastic element 22 preset at the factory of the rotary valve.

[0096] S53. Adjust the threshold of back pressure valve 10 to Q, and adjust the threshold of safety valve 8 to M*40%.

[0097] Users can choose whether to enable the cleaning mode. Before entering the cleaning process, the system will first determine whether the cleaning mode is enabled based on the user's settings. If the user has enabled the cleaning mode, the system will enter the cleaning mode. If the user has disabled the cleaning mode, the system will directly enter the normal working mode.

[0098] In normal operation mode, the cleaning component enters the pressure storage mode, switches the three-way valve to the first pressure relief pipe 32, connects the back pressure valve 10 to atmospheric pressure, and the pressure storage device pressurizes the pressure storage tank 12 according to the rotation of the motor 5. The threshold of the safety valve 8 is set to the pressure value of the pressure sensor 20 * 40. The pressure storage tank 12 stores the pressure for the next use.

[0099] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0100] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A control method using a rotary valve, characterized in that, The rotary valve includes: The rotary cutting valve head is provided with a cleaning inlet channel, a cleaning outlet channel, and a working channel; multiple working channels are arranged around the rotary cutting valve head; a safety valve is connected to the cleaning outlet channel. The stator is installed inside the rotary valve head; the stator is provided with a first flow channel communicating with the cleaning inlet, a second flow channel communicating with the cleaning outlet flow channel, and sub-flow channels communicating with the working flow channels one by one. The rotor rotates in conjunction with the stator; a cleaning groove is provided in the middle of the rotor, and the cleaning groove is connected to the first flow channel and the second flow channel; an arc-shaped groove is provided on the edge of the rotor, and the arc-shaped groove is connected to two adjacent sub-flow channels; and the cleaning groove and the arc-shaped groove are not connected to each other. An electric motor is connected to a rotating shaft; the rotating shaft is connected to a rotor, and a first elastic element is connected to the rotating shaft. The first elastic element has elastic potential energy to drive the rotor to press against the stator; a pressure sensor is provided at the end of the first elastic element away from the rotor. A cleaning assembly, connected to the cleaning inlet channel, is used to inject cleaning medium into the cleaning inlet channel; The control method includes the following steps: Determine whether the rotary valve has been idle for a long time by checking whether it is the first start-up after power-on. If the rotary valve is in a long-term idle state, then continue to determine whether the motor is in a step-loss state; if the motor is in a step-loss state, then perform step-loss correction on the motor; if the motor is not in a step-loss state, then further determine whether the rotary valve is in an idle state. If the rotary valve is not in a long-term idle state, then the idle time of the rotary valve is further determined to determine whether the rotary valve is in an idle state. If the rotary valve is idle, perform a disengagement / engagement process; If the rotary valve is not idle, it should be cleaned. The process of step loss correction includes: Connect the cleaning inlet channel to the cleaning assembly, and inject the cleaning medium into the cleaning inlet channel through the cleaning assembly; The anti-sucking reverse pressure value is preset to P, P=50%*M, where M is the pressure value of the first elastic element detected by the pressure sensor. Set the threshold of the safety valve to P, and gradually increase the pressure of the cleaning inlet flow channel until the pressure value of the safety valve reaches the threshold P. After starting the motor and depressurizing the safety valve, check again whether steps have been lost. If the step loss still occurs, increase the anti-clamping reverse pressure value by 10%*M each time, and repeat the step loss correction. The de-adsorption process includes: Connect the cleaning inlet channel to the cleaning assembly, and inject the cleaning medium into the cleaning inlet channel through the cleaning assembly; The anti-sucking reverse pressure value is preset to P, P=50%*M, where M is the pressure value of the first elastic element detected by the pressure sensor. Set the safety valve threshold to P, and gradually increase the pressure in the cleaning inlet channel until the safety valve pressure reaches the threshold P.

2. The control method for the rotary valve according to claim 1, characterized in that, The cleaning assembly includes: The pressure tank is connected to the cleaning inlet channel via a back pressure valve; A pressure storage device, connected to a pressure storage tank, is used to inject cleaning media into the pressure storage tank and to maintain pressure in the tank.

3. The control method for the rotary valve according to claim 2, characterized in that, The pressure storage device includes: A cam mechanism is connected to a motor drive; the motor is a dual-axis stepper motor that synchronously drives the cam mechanism and the rotating shaft to rotate. A push rod is movably mounted inside the housing along its axial direction; the push rod abuts against the cam mechanism, causing the push rod to move along its axial direction when the cam mechanism rotates; A piston cylinder has an internal piston passage; an inlet check valve and an outlet check valve are connected to the piston cylinder; the piston passage is connected to a cleaning medium storage tank through the inlet check valve and to a pressure tank through the outlet check valve. The piston rod is movably connected within the piston passage and is connected to the push rod.

4. The control method for the rotary valve according to claim 3, characterized in that, A second elastic element is connected to the push rod, and the second elastic element has elastic potential energy that drives the push rod to move away from the piston cylinder.

5. The control method for the rotary valve according to claim 2, characterized in that, A three-way switching valve is provided between the back pressure valve and the cleaning inlet channel; one end of the three-way switching valve is connected to the back pressure valve, one end is connected to the cleaning inlet channel, and the other end is connected to the atmosphere.

6. The control method for the rotary valve according to claim 1, characterized in that, The cleaning process includes: Connect the cleaning inlet channel to the cleaning assembly, and inject the cleaning medium into the cleaning inlet channel through the cleaning assembly; Set the maximum cleaning pressure to Q, where Q = (2 * EM) * 90%, and E is the factory-preset pressure value of the first elastic element. Adjust the pressure threshold of the cleaning inlet channel to Q, and adjust the threshold of the safety valve to M*40%.

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