Anti-clamping rotation system and method for water pump

Abstract

The invention relates to an anti-jamming system and method for a water pump. The anti-jamming system comprises a jamming detection assembly, a jamming releasing assembly and a controller. The clamping rotation detection assembly comprises a current detection element, the current detection element is used for detecting the current of the motor, and the current detection element is electrically connected with the controller; the unclamping assembly comprises a collision block and a collision groove, one of the collision block and the collision groove is arranged on the pump shaft, the other one of the collision block and the collision groove is arranged on the movable ring, the collision block is located in the collision groove, and the width of the collision groove is larger than that of the collision block in the circumferential direction of the pump shaft; the controller is electrically connected with the motor and used for controlling a motor shaft of the motor to switch the rotation direction according to an abnormal current signal fed back by the current detection element so that the two sides of the collision block and the collision groove can collide in a reciprocating mode. According to the scheme, the running state of the water pump can be automatically obtained, the motor is subjected to forward and reverse control in combination with the controller, automatic release of the water pump can be achieved under the non-stop condition, the unmanned and maintenance-free design is achieved, more intelligence is achieved, and release efficiency is higher.

Description

Technical Field

[0001] This application relates to the field of water pump technology, and in particular to an anti-jamming system and method for water pumps. Background Technology

[0002] A water pump is a machine that transports or pressurizes liquids. To prevent liquid leakage and ensure the sealing between the pump casing and the pump shaft, a mechanical seal assembly is usually installed in the water pump. The mechanical seal assembly mainly consists of a rotating sealing ring and a stationary ring. However, when the water pump is used to pump highly viscous liquids, after the water pump stops, the highly viscous liquid tends to stick between the rotating and stationary rings of the mechanical seal. This causes the pump shaft to be unable to rotate when the motor is restarted, which in turn prevents the water pump from starting and may even burn out the motor.

[0003] Currently, when a water pump gets stuck, it is usually unstuck by force, which means increasing the motor torque and using a larger driving force to unslip the pump. This method can easily lead to excessive motor current and burnout, and can also cause failure of the sealing surfaces of the dynamic and static rings. Another method is to disassemble the water pump and perform manual maintenance to unslip it, but this method is not only cumbersome to operate, but also requires the water pump to be shut down, which is time-consuming and labor-intensive. Summary of the Invention

[0004] Based on this, the present invention provides an anti-jamming system and method for water pumps to solve the problems in the prior art where water pumps are prone to burning out the motor and are time-consuming and labor-intensive to maintain after jamming.

[0005] On one hand, the present invention provides an anti-jamming system for a water pump, the water pump including a mechanical seal assembly, a pump shaft and a motor for driving the pump shaft, wherein the mechanical seal assembly includes a rotating ring and a stationary ring, the rotating ring being rotatably fitted onto the pump shaft, and the anti-jamming system including a jamming detection assembly, a jamming release assembly and a controller;

[0006] The card rotation detection component includes a current detection element, which is used to detect the current of the motor, and the current detection element is electrically connected to the controller;

[0007] The ejector assembly includes a strike block and a strike groove. One of the strike block and the strike groove is disposed on the pump shaft, and the other is disposed on the moving ring. The strike block is located in the strike groove and is along the circumferential direction of the pump shaft. The width of the strike groove is greater than the width of the strike block.

[0008] The controller is electrically connected to the motor and is used to control the motor shaft to switch rotation direction according to the abnormal current signal fed back by the current detection element, so that the two sides of the impact block and the impact groove reciprocate to impact, wherein the abnormal current is greater than the rated operating current range of the motor.

[0009] In one embodiment, the inner wall of the moving ring is provided with a mounting hole, the impact block is installed in the mounting hole, and the shape of the impact block is adapted to the shape of the mounting hole.

[0010] In one embodiment, the mounting hole is a blind hole, and an elastic element is connected between the end of the impact block and the bottom of the mounting hole;

[0011] The impact block extends into the impact groove under the elastic force of the elastic element, and can be completely retracted into the mounting hole when the impact block compresses the elastic element.

[0012] In one embodiment, the angle between the two sides of the impact groove along the circumferential direction of the pump shaft and the centerline of the pump shaft is 90 degrees to 120 degrees.

[0013] In one embodiment, there are two or more of the impact blocks and impact grooves arranged circumferentially.

[0014] In one embodiment, a sealing ring is provided between the moving ring and the pump shaft.

[0015] In one embodiment, the anti-jamming system further includes a water immersion sensor for detecting whether the mechanical seal assembly is leaking.

[0016] In one embodiment, the motor's terminals are connected to an electronic commutation switch, which is controlled by the controller.

[0017] On the other hand, embodiments of the present invention provide a method for preventing water pumps from jamming, which is executed using any of the anti-jamming systems described above, and includes the following steps:

[0018] S1. Detection of rotation: Start the motor and drive the pump shaft to rotate in the forward direction. The current detection element detects the operating current of the motor and feeds it back to the controller. When the current detection value I is less than I1, execute step S3. When the current detection value I is greater than or equal to I1, execute step S2. The first interval I1 is the rated operating current interval of the motor.

[0019] S2, Card Removal Cycle, includes the following steps:

[0020] S21, the controller controls the motor to switch the rotation direction, the motor drives the pump shaft to rotate in the opposite direction, the current detection element detects the motor's operating current and feeds it back to the controller. If the current detection value I is greater than I1 within the time period t, then step S23 is executed. If the current detection value I is less than I1, then it is determined whether the current detection value I is less than I1 within the time period t-nt. If the current detection value I is less than I1, then step S3 is executed. If the current detection value I is greater than I1, then step S22 is executed.

[0021] S22. The controller controls the motor to switch the rotation direction. The motor drives the pump shaft to rotate in the forward direction. The current detection element detects the operating current of the motor and feeds it back to the controller. If the current detection value I is greater than I1 within the time period t, then step S23 is executed. If the current detection value I is less than I1, then it is determined whether the current detection value I is less than I1 within the time period t-nt. If the current detection value I is less than I1, then step S3 is executed. If the current detection value I is greater than I1, then step S21 is executed.

[0022] Step S23: Stop the motor;

[0023] Where t = θ / ω, θ is the maximum angle that the impact block can rotate along the impact groove, in radians, and ω is the speed of the motor, in radians per second; n is greater than 1;

[0024] S3. Normal operation: The controller controls the motor to return to its initial direction of rotation, and the motor drives the pump shaft to maintain positive rotation.

[0025] In one embodiment, the anti-jamming method further includes:

[0026] Step S4: Mechanical seal assembly failure detection. After the water pump is disengaged, check whether the mechanical seal assembly is leaking.

[0027] If the test shows no leaks, proceed to step S3;

[0028] If a leak is detected, the machine should be stopped and the mechanical seal assembly should be maintained.

[0029] The beneficial effects of this invention are as follows: This anti-jamming system can automatically obtain the operating status of the water pump through a current detection element, and control the motor in both directions in conjunction with the controller. By alternatingly impacting the moving ring, the instantaneous impact force is used to separate the moving ring from the stationary ring, avoiding the problem of excessive motor current causing motor burnout or failure of the sealing surface of the moving and stationary rings due to violent jerking. It has higher reliability and better safety, and can achieve automatic jerking of the water pump without stopping the machine. It achieves unattended, maintenance-free design, is more intelligent, and has higher jerking efficiency, avoiding the risks caused by prolonged water pump shutdown. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the anti-jamming system in one embodiment;

[0031] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0032] Figure 3 for Figure 1 Sectional view of BB;

[0033] Figure 4 This is a connection block diagram of the anti-jamming system in one embodiment;

[0034] Figure 5 This is a flowchart of an anti-card-spinning method in one embodiment.

[0035] The reference numerals in the accompanying drawings include: pump shaft 1, rotating ring 2, impact block 3, impact groove 4, mounting hole 5, elastic element 6, controller 7, motor 8, mechanical seal assembly 9, current detection element 10, and water immersion sensor 11. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0037] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention.

[0038] The structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0039] The orientations or positional relationships indicated by terms such as "upper," "lower," "left," "right," "middle," "longitudinal," "lateral," "horizontal," "inner," "outer," "radial," and "circumferential" used in this specification are based on the orientations or positional relationships shown in the accompanying drawings and are only for the purpose of simplifying the description. They 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 limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] Currently, when a water pump gets stuck, it is usually unstuck by force, which means increasing the motor torque and using a larger driving force to unslip the pump. This method can easily cause the motor to overload and burn out, and can also cause the sealing surfaces of the dynamic and static rings to fail. Another method is to disassemble the water pump and perform manual maintenance to unslip it, but this method is not only cumbersome to operate, but also requires the water pump to be shut down, which is time-consuming and labor-intensive.

[0041] To address this, embodiments of the present invention provide an anti-jamming system for water pumps, which can automatically detect and remove jamming from the water pump. This not only ensures the safety of the equipment but also makes the unjamming process more intelligent and faster, reducing the risk of water pump shutdown.

[0042] Specifically, the water pump includes a pump casing, a mechanical seal assembly 9, a pump shaft 1, and a motor 8 that drives the pump shaft 1. The mechanical seal assembly 9 includes a rotating ring 2 and a stationary ring. The stationary ring is fixed to the pump casing, and the rotating ring 2 is rotatably fitted onto the pump shaft 1.

[0043] The anti-slip-rotation system provided in this embodiment of the invention includes a slip-rotation detection component, a slip-off component, and a controller 7;

[0044] The card rotation detection component includes a current detection element 10, which is used to detect the current of the motor 8, and the current detection element 10 is electrically connected to the controller 7.

[0045] The ejector assembly includes a strike block 3 and a strike groove 4. One of the strike block 3 and the strike groove 4 is disposed on the pump shaft 1 and the other is disposed on the moving ring 2. The strike block 3 is located in the strike groove 4 and is along the circumferential direction of the pump shaft 1. The width of the strike groove 4 is greater than the width of the strike block 3.

[0046] The controller 7 is electrically connected to the motor 8 and is used to control the motor 8 shaft to switch the rotation direction according to the abnormal current signal fed back by the current detection element 10, so that the sides of the impact block 3 and the impact groove 4 reciprocate to impact each other. The abnormal current is greater than the rated operating current range of the motor 8.

[0047] According to the anti-jamming system for water pumps provided in this embodiment of the invention, when the current detection element 10 detects that the motor current is greater than the rated operating current range, for example, several times the rated operating current, it indicates that the water pump is jammed, and then the following unjamming operation can be performed:

[0048] 1) The controller 7 controls the motor 8 to switch the rotation direction. The motor 8 drives the pump shaft 1 to rotate in the opposite direction. During this process, the impact groove 4 (impact block 3) moves together with the pump shaft 1, so that the impact groove 4 (impact block 3) will hit the impact block 3 (impact groove 4), applying a certain instantaneous impact force to the moving ring 2. When the impact groove 4 (impact block 3) hits the impact block 3 (impact groove 4), if the moving ring 2 and the stationary ring are still not separated, the current detection element 10 will still detect a motor current that is several times greater than the rated operating current. At this time, step 2) will continue to be executed.

[0049] 2) The controller 7 controls the motor 8 to switch the rotation direction again. The motor 8 drives the pump shaft 1 to rotate in the forward direction. During this process, the impact groove 4 (impact block 3) moves together with the pump shaft 1, so that the impact groove 4 (impact block 3) will hit the impact block 3 (impact groove 4) from the other side, applying a certain instantaneous impact force to the moving ring 2. When the impact groove 4 (impact block 3) hits the impact block 3 (impact groove 4), if the moving ring 2 and the stationary ring are still not separated, the current detection element 10 will still detect a motor current that is several times greater than the rated operating current. At this time, step 1) is repeated.

[0050] As steps 1) and 2) are repeated, the two sides of the impact groove 4 (impact block 3) will alternately impact the impact block 3 (impact groove 4) on the moving ring 2. Each impact can apply an instantaneous impact force to the moving ring 2, and the direction of the impact is alternating. After multiple impacts, the sealing surface of the moving ring 2 and the sealing surface of the stationary ring are easily separated by force. When the current detection element 10 no longer detects abnormal current, it means that the moving ring 2 can rotate synchronously with the pump shaft 1, the moving ring 2 and the stationary ring have been separated, and the pump is de-jammed.

[0051] This anti-jamming system can automatically acquire the operating status of the water pump through the current detection element 10, and control the motor 8 in both directions with the controller 7. It can achieve automatic unjamming of the water pump without stopping the pump, realizing an unattended, maintenance-free design. It is more intelligent and has a higher unjamming efficiency, avoiding the risks caused by prolonged pump shutdown. Moreover, this system uses alternating and reciprocating impacts on the moving ring 2 to achieve the separation of the moving ring 2 from the stationary ring by using instantaneous impact force. This avoids the problem of excessive motor current causing burnout of the motor 8 or failure of the sealing surface of the moving ring 2 and stationary ring caused by violent unjamming, resulting in higher reliability and better safety.

[0052] The anti-jamming system for water pumps provided in the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0053] according to Figure 4 An exemplary embodiment of at least one embodiment of the present invention is shown of an anti-jamming system for a water pump, the anti-jamming system comprising: a jamming detection component, a dejamming component, and a controller 7.

[0054] This anti-jamming system is applied to water pumps; therefore, this embodiment will first provide an exemplary description of the water pump. The water pump can be any existing conventional water pump, such as an air conditioning water pump, a sewage pump, or a sump pump. It mainly includes a pump shaft 1, a mechanical seal assembly 9, a motor 8, a pump casing, and an impeller, etc. For the sake of simplicity, Figure 1 Only the pump shaft 1 and the rotating ring 2 of the water pump are shown. The rotating ring 2 is rotatably mounted on the pump shaft 1. For example, the rotating ring 2 is fitted with the pump shaft 1 with a clearance, which makes it possible for the rotating ring 2 and the pump shaft 1 to rotate relative to each other. This provides a basis for the pump shaft 1 to be unjammed by hitting the rotating ring 2 with the unjamming assembly.

[0055] In this embodiment, the controller 7 is the control unit of the anti-jamming system, used to receive and process the information fed back by the jamming detection component in the anti-jamming system and issue corresponding instructions based on the information. For example, the controller 7 can control the motor 8 to drive the unjamming component to perform an unjamming operation based on the water pump jamming signal fed back by the jamming detection component.

[0056] Specifically, in this embodiment, since the anti-jamming system is applied to a water pump, the controller 7 can be directly the controller 7 of the water pump system. That is, the controller 7 of the water pump system can be used as the controller 7 of this anti-jamming system. For example, when this system is applied to an air conditioner water pump, the controller 7 can be the control module of the air conditioner. Of course, in other embodiments, the controller 7 can also be set separately. For example, the controller 7 can be a PLC (Programmable Logic Controller 7) or a microcontroller.

[0057] In this embodiment, the jamming detection component is used to detect the jamming of the water pump and feed back the jamming signal to the controller 7 so that the controller 7 can issue a corresponding unjamming command.

[0058] Specifically, in this embodiment, the card rotation detection component includes a current detection element 10, and the current detection element 10 is connected to the current circuit of the motor 8 for real-time detection of the current of the motor 8. At the same time, the current detection element 10 is also electrically connected to the controller 7, so that it can feed back the motor current detected by the current detection element 10 to the controller 7, so that the controller 7 can perform different operations according to different current detection values ​​I.

[0059] It should be understood that in the prior art, after the sealing surfaces of the rotating ring 2 and the stationary ring of the mechanical seal assembly 9 adhere, the rotating ring 2 will be fixed to the stationary ring. This causes the rotating ring 2 to exert a large resistance on the rotation of the pump shaft 1, preventing the pump shaft 1 from rotating. Consequently, the rotor of the motor 8 also cannot rotate, causing the entire voltage after the motor 8 starts to be applied to the windings of the motor 8. This results in the motor current increasing to several times the rated operating current. In other words, the motor current when the water pump is stuck is several times the motor current under normal operating conditions. Based on this, this embodiment uses the current detection element 10 as the stuck detection element, and uses the measured current value as the stuck signal for whether the water pump is stuck. This allows for a simple and clear determination of whether the water pump is stuck, and the response is sensitive and rapid.

[0060] Specifically, in this embodiment, the motor current measured by the current detection element 10 mainly includes two types: normal current and abnormal current. The normal current is the motor current measured within the rated operating current range of the motor 8. Within this current range, the motor 8 can operate stably for a long time, indicating that the water pump is not stuck. The controller 7 can control the motor 8 to maintain normal operation based on this current value. The abnormal current, on the other hand, is the motor current measured to be several times greater than the rated operating current of the motor 8. Based on this measured current, it indicates that the rotor of the motor 8 has stalled, further indicating that the pump shaft 1 of the water pump is stuck. This abnormal current is the stall current, and the controller 7 can perform a disengagement operation based on this current value. The disengagement operation will be specifically described below in conjunction with the disengagement component.

[0061] Furthermore, in this embodiment, the current detection element 10 can specifically be a current sensor, which has the advantages of high accuracy and fast response. It can quickly and accurately detect whether the water pump is operating abnormally, ensure the timely release of the water pump from jamming, and avoid the risk of downtime and equipment damage.

[0062] In this embodiment, the card removal component is used to perform a card removal operation on the water pump in conjunction with the card removal command of the controller 7, so as to realize the automatic card removal of the water pump.

[0063] For details, see Figure 2 and Figure 3 The ejector assembly includes a strike block 3 and a strike groove 4, wherein either the strike block 3 or the strike groove 4 is disposed on the pump shaft 1, and the other is disposed on the rotating ring 2, for example, Figure 1 An exemplary embodiment is shown in which the impact groove 4 is disposed on the pump shaft 1 and the impact block 3 is disposed on the moving ring 2. The impact block 3 is located in the impact groove 4. At the same time, along the circumferential direction of the pump shaft 1 and the moving ring 2, the width of the impact groove 4 is greater than the width of the impact block 3. That is to say, in the circumferential direction, the impact block 3 has a certain movable space in the impact groove 4.

[0064] For more details, see Figure 2 In this embodiment, the moving ring 2 has a mounting hole 5 on its hole wall. The shape of the mounting hole 5 is adapted to the shape of the impact block 3. For example, the mounting hole 5 is a round hole and the impact block 3 is cylindrical, so that the impact block 3 can fit perfectly into the mounting hole 5, which makes it easy for the impact block 3 to directly transmit the impact force received to the moving ring 2, ensuring the impact effect on the moving ring 2.

[0065] See Figure 2In some embodiments, the mounting hole 5 is a blind hole, and an elastic element 6, which is a spring, is provided between the impact block 3 and the bottom of the mounting hole 5. In the initial state, the impact block 3 can extend at least partially outside the mounting hole 5 and be located in the impact groove 4 under the elastic force of the elastic element 6, so that the impact block 3 can impact the side wall of the impact groove 4. When the impact block 3 compresses the elastic element 6, the impact block 3 can also be completely retracted into the mounting hole 5. With this configuration, the elastic element 6 allows the impact block 3 to be pressed back into the mounting hole 5 when the rotating ring 2 is installed, so as to facilitate the mounting of the rotating ring 2 onto the pump shaft 1. After the rotating ring 2 is installed in place, the impact block 3 can extend into the impact groove 4 under the elastic force of the elastic element 6, which facilitates the assembly between the rotating ring 2 and the pump shaft 1.

[0066] In other embodiments, the mounting hole 5 can also be a threaded through hole that passes through the moving ring 2. When the moving ring 2 is installed on the pump shaft 1, the impact block 3 can be screwed into the mounting hole 5 from the outside of the moving ring 2 and extended into the impact groove 4, which can also ensure the mutual cooperation between the impact block 3 and the impact groove 4.

[0067] In this embodiment, along the axial direction of the pump shaft 1, the length of the impact groove 4 is greater than the thickness of the impact block 3, so that the impact block 3 has axial space in the impact groove 4. This axial space can avoid axial locking between the moving ring 2 and the pump shaft 1, and facilitate the moving ring 2 to move towards the stationary ring under the push of the spring on its left side after the sealing surfaces of the moving ring 2 and the stationary ring are worn, thus ensuring the sealing performance of the sealing surfaces between the moving ring 2 and the stationary ring.

[0068] Further, see Figure 2 and Figure 3 The pump shaft 1 is also provided with a relief groove 401, which is located to the left of the impact groove 4 and communicates with it. The bottom surface of the relief groove 401 is inclined, specifically, the bottom surface of the relief groove 401 extends upward from the bottom surface of the impact groove 4 to the surface of the pump shaft 1. Meanwhile, the bottom of the impact block 3 has a smooth arc shape. With this configuration, when it is necessary to remove the moving ring 2 from the pump shaft 1, first align the impact block 3 with the relief groove 401, and then push the moving ring 2 to the left to allow the impact block 3 to enter the relief groove 401. During the movement, the inclined bottom surface of the relief groove 401 can gradually apply radial force to the impact block 3, causing the impact block 3 to gradually retract into the mounting hole 5 until the impact block 3 disengages from the impact groove 4 and the relief groove 401 and moves to the surface of the pump shaft 1. The relief groove 401 facilitates the disassembly of the moving ring 2.

[0069] Based on the above-mentioned structural design of the unblocking component, in this embodiment, the unblocking command refers to the controller 7 receiving an abnormal current signal from the current detection element 10 and controlling the motor 8 shaft of the motor 8 to switch the rotation direction. For example, an electronic reversing switch is connected to the wiring terminal of the motor 8. Whenever the controller 7 receives feedback of an abnormal current signal, it controls the electronic reversing switch to switch the direction, from forward rotation to reverse rotation or from reverse rotation to forward rotation, thereby realizing the switching of the direction of the motor 8, so that the impact block 3 and impact groove 4 between the pump shaft 1 and the moving ring 2 can reciprocate to impact, thus completing the disengagement of the water pump.

[0070] Specifically, based on the above structural design, during use, the motor 8 starts and drives the pump shaft 1 to rotate in the forward direction. When the current detection element 10 detects that the motor current is greater than the rated operating current, for example, several times the rated operating current, it indicates that the water pump is stuck. Then, the following unblocking operation can be performed:

[0071] 1) Controller 7 controls motor 8 to switch rotation direction. Motor 8 drives pump shaft 1 to rotate in the opposite direction. Motor 8 stall is eliminated, motor current immediately returns to normal, current detection element 10 detects rated operating current, and then the impact groove 4 moves together with pump shaft 1 until the impact groove 4 hits the impact block 3, applying a certain instantaneous impact force to the moving ring 2. When the impact groove 4 hits the impact block 3, if the moving ring 2 and the stationary ring are still not separated, the current detection element 10 will detect an abnormal current several times greater than the rated operating current. At this time, step 2) is executed.

[0072] 2) The controller 7 controls the motor 8 to switch the rotation direction again. The motor 8 drives the pump shaft 1 to rotate in the forward direction. The motor 8 stall is eliminated, the motor current immediately returns to normal, the current detection element 10 detects the rated operating current, and then the impact groove 4 moves together with the pump shaft 1 until the impact groove 4 hits the impact block 3, applying a certain instantaneous impact force to the moving ring 2. When the impact groove 4 hits the impact block 3, if the moving ring 2 and the stationary ring are still not separated, the current detection element 10 will detect an abnormal current several times greater than the rated operating current. At this time, step 1) is repeated.

[0073] As steps 1) and 2) are repeated, the two sides of the impact groove 4 will alternately impact the impact block 3 on the moving ring 2. Each impact can apply an instantaneous impact force to the moving ring 2, and the direction of the impact is alternating. This makes it easy for the sealing surface of the moving ring 2 and the sealing surface of the stationary ring to separate under force after multiple impacts. When the current detection element 10 no longer detects abnormal current, it means that the moving ring 2 can rotate synchronously with the pump shaft 1, the moving ring 2 and the stationary ring have been separated, and the pump has been unblocked. Then the controller 7 can drive the motor 8 to operate normally.

[0074] Based on the above, compared with the violent unblocking method (increasing the torque of motor 8 to increase the driving force on the moving ring 2 to separate the moving ring 2 from the stationary ring), this embodiment achieves the separation of the moving ring 2 from the stationary ring by alternately and repeatedly impacting the moving ring 2 and using the instantaneous impact force. This not only has high unblocking efficiency and good effect, but also ensures that the motor 8 immediately switches direction after detecting the stall current during the unblocking process. This avoids the problem of excessive current caused by prolonged stalling of motor 8, which could burn out the motor. It also avoids the problem of excessive motor current causing burnout of motor 8 or failure of the sealing surface of the moving ring 2 and stationary ring due to violent unblocking. Therefore, it is safer and more reliable.

[0075] It should be understood that in practical applications, when the pump impeller becomes stuck, the current detection element 10 will also detect an abnormal current. When the current detection element 10 detects an abnormal current, the controller 7 will also control the motor 8 to drive the pump shaft 1 in reverse. However, this action is different from the mechanical seal unblocking, and it may lead to the following two situations:

[0076] 1. If the pump shaft 1 can drive the impeller to reverse, it means that the reverse rotation of the impeller can quickly remove the stuck foreign objects. At this time, it is the same as step 1) of the above mechanical seal unblocking. The motor current will quickly return to normal, the current detection element 10 can detect the normal current, and then the controller 7 can control the water pump to operate normally based on the detected current.

[0077] 2. If pump shaft 1 cannot drive the impeller to reverse, it means that the impeller is stuck by a foreign object. Since pump shaft 1 has no neutral position to rotate, the current detection element 10 will detect a continuous stall current. The controller 7 will not control the motor 8 to switch the direction, but will instead cut off the power and alarm to remind the staff to perform maintenance in order to avoid the motor from burning out due to continuous stall.

[0078] Therefore, this anti-jamming system can not only unjamm the pump mechanical seal, but also unjamm some simple pump impeller jams, distinguishing them from completely jammed impellers, so as to remind the staff.

[0079] Furthermore, in this embodiment, the angle between the two sides of the impact groove 4 and the centerline of the pump shaft 1 is 90 degrees to 120 degrees, for example, 90 degrees, 100 degrees, 120 degrees, etc. Figure 3 An exemplary embodiment is shown in which the angle between the two sides of the impact groove 4 and the centerline of the pump shaft 1 is 90 degrees. With this configuration, the impact groove 4 within this angle range can have a large range of motion between the impact groove 4 and the impact block 3, allowing the pump shaft 1 to accumulate a large potential energy before each impact with the impact block 3. This results in a larger instantaneous impact force of the pump shaft 1 on the impact block 3, thereby improving the speed and effectiveness of the unblocking of the rotating ring 2.

[0080] In some embodiments, the impact groove 4 and the impact block 3 are provided in two or more sets, for example, two sets, three sets, four sets, etc., see [reference]. Figure 3 The example demonstrates an implementation where the impact groove 4 and the impact block 3 are arranged in two sets. With this arrangement, the moving ring 2 can be impacted synchronously by two or more sets of impact forces, which can improve the instantaneous impact effect on the moving ring 2, making the moving ring 2 separate from the stationary ring faster and the unblocking effect better.

[0081] See Figure 1 In this embodiment, a sealing ring is also provided between the moving ring 2 and the pump shaft 1. The sealing ring can prevent external media from entering the pump and ensure the normal operation and safety of the pump.

[0082] See Figure 4 In this embodiment, the anti-jamming system also includes a water immersion sensor 11 for detecting whether the mechanical seal assembly 9 is leaking. For example, a water immersion sensor 11 is also installed inside the pump casing on one side of the rotating ring 2. With this configuration, the water immersion sensor 11 can confirm whether the sealing surfaces of the rotating ring 2 and the stationary ring have failed during the unjamming process. If the water immersion sensor 11 detects a large amount of leakage, it indicates that the sealing surfaces of the rotating ring 2 and the stationary ring may have failed. Users can promptly check the mechanical seal to ensure the reliability of the pump operation. Moreover, a large amount of leakage after unjamming indicates that the impact force on the rotating ring 2 during the unjamming process may be too large. In combination with this leakage situation, the preset unjamming speed in the controller 7 can be adjusted. Specifically, the unjamming speed is reduced so that the speed of the motor 8 and the pump shaft 1 can be lower during subsequent unjamming operations, and the impact force on the rotating ring 2 during unjamming can be reduced, so as to avoid the sealing rings of the rotating ring 2 and the stationary ring from failing again during subsequent unjamming operations, thereby reducing the risk of mechanical seal failure and improving the reliability of the pump operation.

[0083] This invention also provides a method for preventing water pumps from jamming, which employs the anti-jamming system provided in any of the above embodiments, such as... Figure 5 As shown, it includes the following steps:

[0084] S1, Card transfer detection;

[0085] S2, Card removal cycle;

[0086] S3, Normal operation.

[0087] Specifically, step S1 includes: starting the motor 8, which drives the pump shaft 1 to rotate in the forward direction; the current detection element 10 detects the operating current of the motor 8 and feeds it back to the controller 7; when the current detection value I is less than I1, step S3 is executed; when the current detection value I is greater than or equal to I1, step S2 is executed.

[0088] Wherein, I1 represents the stall current of motor 8. When the current detection value I is less than I1, it indicates that motor 8 is in a normal and stable operating state, and the water pump is also in a normal and stable operating state without stalling. However, when the current detection value I is greater than or equal to I1, it indicates that the operating current of motor 8 increases sharply, motor 8 stalls, and the water pump stalls. It should be noted that the rated operating current range and stall current I1 vary for motors 8 with different power, capacity, and specifications. Therefore, this embodiment does not limit the specific value of I1. Generally speaking, the stall current can be 5-7 times the rated operating current.

[0089] Step S2 specifically includes:

[0090] S21, the controller 7 controls the motor 8 to switch the rotation direction, the motor 8 drives the pump shaft 1 to rotate in the opposite direction, the current detection element 10 detects the operating current of the motor 8 and feeds it back to the controller 7. If the current detection value I is greater than I1 within the time period t, then step S23 is executed. If the current detection value I is less than I1, then it is determined whether the current detection value I is less than I1 within the time period t-nt. If the current detection value I is less than I1, then step S3 is executed. If the current detection value I is greater than I1, then step S22 is executed.

[0091] S22. The controller 7 controls the motor 8 to switch the rotation direction. The motor 8 drives the pump shaft 1 to rotate in the forward direction. The current detection element 10 detects the operating current of the motor 8 and feeds it back to the controller 7. If the current detection value I is greater than I1 within the time period t, then step S23 is executed. If the current detection value I is less than I1, then it is determined whether the current detection value I is less than I1 within the time period t-nt. If the current detection value I is less than I1, then step S3 is executed. If the current detection value I is greater than I1, then step S21 is executed.

[0092] S23, motor stops.

[0093] Where t = θ / ω, θ is the maximum angle that the impact block 3 can rotate along the impact groove 4, in radians, and ω is the rotational speed of the motor 8, in radians per second. Therefore, during the time interval t when the pump shaft 1 rotates, the relative rotation between the impact block 3 and the impact groove 4 is exactly such that the impact block 3 abuts against one side of the impact groove 4 and then abuts against the other side of the impact groove 4.

[0094] Where n is greater than 1, for example, n can be 1.5, 2, 2.5, etc., and its specific value can be set according to the motor specifications and model.

[0095] In step S2, if the current detection value I is continuously greater than I1, it indicates that the water pump impeller is stuck. At this time, the motor stops and the staff is reminded to perform maintenance to avoid the motor from continuing to stall and burn out.

[0096] When the current detection value I fluctuates in a pulse-like manner, i.e., I is less than I1 within time period t and greater than I1 within time period t-nt, it indicates that there is relative rotation between pump shaft 1 and moving ring 2 within time period t. During this period, the impact block 3 just rotates from one side to the other relative to the impact groove 4, and the current detection value I is within the rated current range. After pump shaft 1 has rotated for time t, the side wall of the impact groove 4 just comes into contact with the impact block 3. If I is greater than I1 within time period t-nt after contact, it indicates that the current is the stall current. During this period, pump shaft 1 cannot drive the moving ring 2 to rotate, and there is a problem of mechanical seal jamming. Then, switch to S21 or S22 for reversal. Based on this, steps S21 and S22 are performed alternately in a cycle. The motor 8 continuously switches directions, driving the pump shaft 1 to repeatedly impact the impact block 3 on the moving ring 2. Each impact can apply an instantaneous impact force to the moving ring 2. After multiple impacts, the sealing surface of the moving ring 2 and the sealing surface of the stationary ring are easily separated by force, which can better achieve the purpose of pump unblocking.

[0097] When the current detection value I is consistently less than I1, it indicates that the moving ring 2 has disengaged from the stationary ring, thus de-jamming the water pump. At this point, the internal circulation of step S2 is interrupted, and the process proceeds to step S3.

[0098] Step S3 specifically involves the controller 7 controlling the motor 8 to return to its initial direction of rotation, i.e., to rotate in the forward direction, and maintaining the forward rotation at a specified speed (the speed at which the water pump is running normally). At this time, the motor 8 can drive the pump shaft 1 to maintain the forward rotation.

[0099] In some embodiments, the anti-jamming method further includes step S4, mechanical seal assembly 9 failure detection.

[0100] Step S4 specifically involves: after the water pump is disengaged, checking whether the mechanical seal assembly 9 is leaking water, for example, by using the water immersion sensor 11 to check whether the mechanical seal assembly 9 is leaking water.

[0101] If the test shows no leakage, it means that the mechanical seal assembly 9 has not failed and the unblocking cycle has not damaged the mechanical seal assembly 9. You can continue to execute step S3.

[0102] If a leak is detected, it indicates that the sealing surface of the mechanical seal assembly 9 may have failed. In this case, the machine should be stopped and the mechanical seal assembly 9 should be maintained. At the same time, the disengagement speed of the motor 8 set in the controller 7 should be reduced.

[0103] A large leakage rate after unblocking indicates that the impact force on the moving ring 2 may have been too high during the unblocking process. Considering this leakage situation, the preset unblocking speed in the controller 7 is lowered. This allows for lower speeds of the motor 8 and pump shaft 1 during subsequent unblocking operations, reducing the impact force on the moving ring 2 during unblocking. This prevents the sealing rings of the moving ring 2 and stationary ring from failing again in subsequent unblocking operations, reducing the risk of mechanical seal failure and improving the operational reliability of the water pump. The unblocking speed refers to the speed of motor 8 during the S2 unblocking cycle.

[0104] 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.

[0105] The above embodiments merely illustrate 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 invention patent. 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. An anti-jamming system for a water pump, the water pump comprising a mechanical seal assembly (9), a pump shaft (1), and a motor (8) for driving the pump shaft (1), wherein, The mechanical seal assembly (9) includes a rotating ring (2) and a stationary ring, wherein the rotating ring (2) is rotatably fitted onto the pump shaft (1), and the anti-jamming system includes a jamming detection assembly, a jamming release assembly and a controller (7); The card rotation detection component includes a current detection element (10), which is used to detect the current of the motor (8), and the current detection element (10) is electrically connected to the controller (7); The ejector assembly includes a strike block (3) and a strike groove (4). One of the strike block (3) and the strike groove (4) is disposed on the pump shaft (1) and the other is disposed on the moving ring (2). The strike block (3) is located in the strike groove (4) along the circumferential direction of the pump shaft (1). The width of the strike groove (4) is greater than the width of the strike block (3). The controller (7) is electrically connected to the motor (8) and is used to control the motor (8) shaft of the motor (8) to switch the rotation direction according to the abnormal current signal fed back by the current detection element (10), so that the two sides of the impact block (3) and the impact groove (4) reciprocate to impact, wherein the abnormal current is the stall current of the motor (8).

2. The anti-jamming system according to claim 1, characterized in that, The inner wall of the moving ring (2) is provided with a mounting hole (5), and the impact block (3) is installed in the mounting hole (5).

3. The anti-jamming system according to claim 2, characterized in that, The mounting hole (5) is a blind hole, and an elastic element (6) is connected between the end of the impact block (3) and the bottom of the mounting hole (5); The impact block (3) extends into the impact groove (4) under the elastic force of the elastic member (6), and the impact block (3) can completely retract into the mounting hole (5) when it compresses the elastic member (6).

4. The anti-jamming system according to claim 1, characterized in that, The angle between the two sides of the impact groove (4) along the circumferential direction of the pump shaft (1) and the axis of the pump shaft (1) is 90 degrees to 120 degrees.

5. The anti-jamming system according to claim 1, characterized in that, The impact block (3) and the impact groove (4) are provided in two or more in the circumferential direction.

6. The anti-jamming system according to claim 1, characterized in that, A sealing ring is provided between the moving ring (2) and the pump shaft (1).

7. The anti-jamming system according to claim 1, characterized in that, The anti-jamming system also includes a water immersion sensor (11) for detecting whether the mechanical seal assembly (9) is leaking.

8. The anti-jamming system according to claim 1, characterized in that, The motor (8) is connected to an electronic reversing switch at its terminals, and the electronic reversing switch is controlled by the controller (7).

9. A method for preventing jamming in a water pump, characterized in that, The anti-jamming system according to any one of claims 1-8 is used, comprising the following steps: S1. Stuck rotation detection: Start the motor (8). The motor (8) drives the pump shaft (1) to rotate in the forward direction. The current detection element (10) detects the operating current of the motor (8) and feeds it back to the controller (7). When the current detection value I is less than I1, execute step S3. When the current detection value I is greater than or equal to I1, execute step S2. I1 is the stall current of the motor (8). S2, Card Removal Cycle, includes the following steps: S21, the controller (7) controls the motor (8) to switch the rotation direction, the motor (8) drives the pump shaft (1) to rotate in the opposite direction, the current detection element (10) detects the operating current of the motor (8) and feeds it back to the controller (7). If the current detection value I is greater than I1 within the time period t, then step S23 is executed. If the current detection value I is less than I1, then it is determined whether the current detection value I is less than I1 within the time period t-nt. If the current detection value I is less than I1, then step S3 is executed. If the current detection value I is greater than I1, then step S22 is executed. S22. The controller (7) controls the motor (8) to switch the rotation direction. The motor (8) drives the pump shaft (1) to rotate in the forward direction. The current detection element (10) detects the operating current of the motor (8) and feeds it back to the controller (7). If the current detection value I is greater than I1 within the time period t, then step S23 is executed. If the current detection value I is less than I1, then it is determined whether the current detection value I is less than I1 within the time period t-nt. If the current detection value I is less than I1, then step S3 is executed. If the current detection value I is greater than I1, then step S21 is executed. Step S23: Stop the motor; Where t = θ / ω, where θ is the maximum angle that the impact block (3) can rotate along the impact groove (4), in radians, and ω is the rotational speed of the motor (8), in radians / second; n is greater than 1; S3. Normal operation. The controller (7) controls the motor (8) to return to the initial direction of rotation. The motor (8) drives the pump shaft (1) to maintain positive rotation.

10. The anti-jamming method according to claim 9, characterized in that, Also includes: Step S4: Mechanical seal assembly (9) failure detection. After the water pump is disengaged, check whether the mechanical seal assembly (9) is leaking. If the test shows no leaks, proceed to step S3; If a leak is detected, the machine should be stopped and the mechanical seal assembly (9) should be maintained.

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