Submersible pump, drainage system and compensation method for a drainage system

Abstract

The present disclosure relates to a submersible pump, a drainage system and a compensation method of the drainage system, the submersible pump comprising a non-return valve arranged at an outlet of the submersible pump, the non-return valve comprising a valve body, a valve flap and a reset device, a channel for liquid flow is formed in the valve body, a valve seat is arranged at a bottom of the channel, the valve flap is arranged in the channel and is hingedly connected to the valve body at one end and is rotatable about the hinged point with the valve body at the other end, and the valve flap is in contact with the valve seat at the other end to block the liquid flow in the channel, the reset device is arranged in the channel, and the reset device comprises a base, an electromagnetic coil and a push rod, the base is connected to an inner wall of the valve body and is arranged in space with the valve flap, the electromagnetic coil and the push rod are arranged in the base, and the electromagnetic coil is arranged on the outer side of the push rod in a circumferential direction, the electromagnetic coil is capable of providing a force to the push rod to approach the valve flap when the electromagnetic coil is energized, and the push rod is capable of providing a force to press the valve flap to the valve seat when the push rod is in contact with the valve flap. The occurrence of frequent start and stop of the submersible pump caused by valve leakage is reduced.

Description

Technical Field

[0001] This disclosure relates to the field of drainage equipment technology, and more specifically, to a submersible pump, a drainage system, and a compensation method for the drainage system. Background Technology

[0002] In industrial drainage systems such as power plants and pumping stations, ordinary swing or lift check valves are commonly used at the outlet of submersible pumps in sump pits to prevent backflow of water in the pipeline after the pump stops. The valve disc is opened by the kinetic energy of the forward flow of the medium, and automatically falls back to the valve seat under its own weight or spring force when the pump stops, forming a seal. However, after prolonged use, foreign objects may become stuck in the check valve, causing the valve disc to open too wide and resulting in a poor seal. This leads to frequent start-stop cycles of the submersible pump, accelerating corrosion and damage to components such as the pump body and flange bolts, resulting in economic losses. Summary of the Invention

[0003] The purpose of this disclosure is to provide a submersible pump, a drainage system, and a compensation method for the drainage system to reduce the probability of frequent start-stop of the submersible pump and equipment damage caused by check valve leakage, thereby reducing operation and maintenance costs.

[0004] To achieve the above objectives, this disclosure provides a submersible pump, including a check valve disposed at the outlet of the submersible pump. The check valve includes a valve body, a valve disc, and a reset device. A liquid flow channel is formed within the valve body, and a valve seat is provided at the bottom of the channel. The valve disc is disposed in the channel, with one end hinged to the valve body and the other end rotatable about the hinge point with the valve body. When the other end of the valve disc contacts the valve seat, it blocks the flow of liquid in the channel. The reset device is disposed in the channel and includes a base, an electromagnetic coil, and a push rod. The base is connected to the inner wall of the valve body and spaced apart from the valve disc. The electromagnetic coil and the push rod are disposed in the base, and the electromagnetic coil is circumferentially arranged outside the push rod. When the electromagnetic coil is energized, it can provide a force to the push rod close to the valve disc. When the push rod contacts the valve disc, it can provide a force to press the valve disc against the valve seat.

[0005] Optionally, the submersible pump further includes a first detection element and a second detection element. The first detection element is disposed on the valve disc, and the second detection element can detect the first detection element when the gap between the valve disc and the valve seat is greater than a first preset value.

[0006] Optionally, the second detection element includes a plurality of detection units spaced apart, and all the detection units are located on the projection of the movement path of the first detection element onto the side wall of the valve body.

[0007] Optionally, the first detection element is a permanent magnet, and the detection unit is a Hall sensor.

[0008] Optionally, the reset device includes a reset member disposed in the base and capable of providing a force to the push rod away from the valve disc.

[0009] According to a second aspect of this disclosure, a drainage system is provided, including the submersible pump described above.

[0010] According to a third aspect of this disclosure, a compensation method for a drainage system is provided, using the aforementioned drainage system, the compensation method comprising: The submersible pump is controlled to be in the off state; The reset device is activated, causing the valve disc to press against the valve seat.

[0011] Optionally, the drainage system further includes a first detection element and a second detection element. The first detection element is disposed on the valve disc. When the gap between the valve disc and the valve seat is greater than a first preset value, the second detection element can detect the first detection element. The compensation method includes: Before the step of controlling the reset device to start and causing the valve disc to press against the valve seat, record whether the second detection element detects the first detection element; After the step of controlling the reset device to start and causing the valve disc to press against the valve seat, the system records whether the second detection element detects the first detection element.

[0012] Optionally, the compensation method includes: If the second detection element detects the first detection element both before and after the reset device is started, the drainage system will be controlled to stop and alarm. If the second detection element fails to detect the first detection element both before and after the reset device is activated, the drainage system is controlled to record normal submersible pump information. If the second detection element detects the first detection element before the reset device is activated, and the second detection element fails to detect the first detection element after the reset device is activated, the drainage system is controlled to record a submersible pump warning message.

[0013] Optionally, after the step of controlling the submersible pump to be in a closed state, the compensation method includes: After a delay time t, the system records whether the second detection device detects the first detection device, where t is 2s to 5s.

[0014] The above technical solution, after the submersible pump is shut down, energizes the solenoid coil to generate magnetic force, driving the push rod to move towards the valve disc. When the push rod contacts the valve disc, it applies a thrust, moving the valve disc towards the valve seat until the valve disc contacts the valve seat, at which point the valve disc closes. This forced valve disc reset reduces the possibility of the valve disc not resetting properly due to foreign object obstruction, thus preventing the submersible pump's check valve from closing abnormally. It also reduces the probability of frequent pump start-ups and shutdowns and equipment damage caused by check valve leakage, improving operational safety and reducing maintenance costs.

[0015] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of a submersible pump according to one embodiment of the present disclosure.

[0017] Explanation of reference numerals in the attached figures 1-Valve body; 10-Channel; 11-Valve seat; 2-Valve disc; 31-First detection element; 32-Second detection element; 321-Detection unit; 33-Third detection element; 4-Reset device; 41-Base; 42-Electromagnetic coil; 43-Push rod; 44-Reset element; 5-Pin. Detailed Implementation

[0018] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0019] In this disclosure, unless otherwise stated, directional terms such as "upper" and "lower" are defined in relation to the actual arrangement direction of the drainage pump during use, and directional terms such as "inner" and "outer" are defined in relation to the outline of the corresponding components. The terms "first," "second," etc., are used to distinguish different components and do not imply sequentiality or importance. Furthermore, in the following description, when referring to the accompanying drawings, unless otherwise explained, the same reference numerals in different drawings denote the same or similar elements.

[0020] According to one embodiment of this disclosure, such as Figure 1As shown, a submersible pump is provided, including a check valve disposed at the outlet of the submersible pump. The check valve includes a valve body 1, a valve disc 2, and a reset device 4. A liquid flow channel 10 is formed inside the valve body 1, and a valve seat 11 is disposed at the bottom of the channel 10. The valve disc 2 is disposed in the channel 10, with one end hinged to the valve body 1 and the other end rotatable about the hinge point with the valve body 1. Here, the valve disc 2 can be hinged to the valve body 1 via a pin 5, but this disclosure does not limit this. When the other end of the valve disc 2 contacts the valve seat 11, it is used to block the flow of liquid in the channel 10. The reset device 4 is disposed in the channel 10 and includes a base 41, an electromagnetic coil 42, and a push rod 43. The base 41 is connected to the inner wall of the valve body 1 and spaced apart from the valve disc 2. The electromagnetic coil 42 and the push rod 43 are disposed in the base 41, and the electromagnetic coil 42 is circumferentially arranged on the outside of the push rod 43. When the electromagnetic coil 42 is energized, the electromagnetic coil 42 can provide a force to the push rod 43 to approach the valve disc 2. Here, the push rod 43 can be made of magnetic material such as iron or steel, which is not limited in this disclosure. When the push rod 43 contacts the valve disc 2, it can provide a force to press the valve disc 2 against the valve seat 11.

[0021] Through the above technical solution, after the submersible pump is shut down, the electromagnetic coil 42 is energized to generate magnetic force to drive the push rod 43 to move towards the valve disc 2. When the push rod 43 contacts the valve disc 2, it applies a thrust to the valve disc 2, causing it to move towards the valve seat 11 until the valve disc 2 contacts the valve seat 11, at which point the valve disc 2 closes. This forced reset of the valve disc 2 reduces the possibility that the valve disc 2 may not be properly reset due to foreign objects or other reasons, thus preventing the submersible pump's check valve from closing properly. This reduces the probability of frequent start-stop cycles and equipment damage caused by check valve leakage, improves operational safety, and reduces maintenance costs.

[0022] Furthermore, the submersible pump may also include a first detection element 31 and a second detection element 32. The first detection element 31 is disposed on the valve disc 2. When the gap between the valve disc 2 and the valve seat 11 is greater than a first preset value, the second detection element 32 can detect the first detection element 31. When the submersible pump is shut down, if the second detection element 32 detects the first detection element 31, it proves that the opening of the valve disc 2 exceeds the preset range. At this time, the valve disc 2 is stuck or mechanically damaged. The second detection element 32 can transmit this signal to the control unit for recording, thereby judging the condition of the valve disc 2 and determining whether the valve disc 2 needs to be repaired based on the recorded information. Here, the first preset value can be set according to requirements, and can be set to 0 or 2mm-3mm. This disclosure does not limit this setting.

[0023] Furthermore, such as Figure 1As shown, the second detection element 32 includes multiple detection units 321 spaced apart, and all detection units 321 are located on the projection of the movement path of the first detection element 31 onto the side wall of the valve body 1. During the movement of the valve disc 2, the first detection element 31 corresponding to different detection units 321 can represent different opening degrees of the valve disc 2. The number of detection units 321 and the distance between adjacent detection units 321 can be set according to actual needs. The distance between adjacent detection units 321 can be the same or different, and this disclosure does not limit this. The setting of multiple detection units 321 can detect the opening degree corresponding to the closed state of the valve disc 2 when no external force is applied, thereby determining the jamming status of the valve disc 2, so as to facilitate maintenance by operators. In addition, a third detection element 33 can also be set in the channel 10. When the third detection element 33 detects the first detection element 31, the corresponding opening degree of the valve disc 2 can be 0.

[0024] Here, the first detection element 31 is a permanent magnet, and the detection unit 321 is a Hall sensor. The Hall sensor operates based on the Hall electromagnetic induction principle, thus eliminating the need for physical contact with the permanent magnet. It can determine whether the permanent magnet is in a corresponding position through the magnetic field. The Hall sensor in the second detection element 32 can include either a switch-type Hall sensor (outputting a digital signal 1 or 0 based on the presence or absence of a magnetic field; outputting 1 when a magnetic field is detected, and 0 when no magnetic field is detected) or a linear Hall sensor (outputting a higher voltage signal as the permanent magnet is closer to the sensor). This disclosure does not limit its application. The combination of the Hall sensor and the permanent magnet provides strong resistance to underwater interference, ensuring a stable long-term output of the detection signal, reducing false alarm rates, and improving the reliability of submersible pump condition monitoring and extending equipment lifespan. Furthermore, when a third detection element 33 is installed within channel 10, this third detection element 33 can also be a Hall sensor; this disclosure does not limit its application.

[0025] According to one embodiment of this disclosure, such as Figure 1 As shown, the reset device 4 includes a reset member 44, which is disposed in the base 41 and can provide a force to the push rod 43 away from the valve disc 2. After the push rod 43 impacts the valve disc 2, the electromagnetic coil 42 is de-energized. At this time, the reset member 44 can drive the push rod 43 to reset in the opposite direction. Here, the reset member 44 can be a permanent magnet with a magnetic force less than that of the electromagnetic coil 42 on the push rod 43, and is disposed on the side of the push rod 43 away from the valve disc 2. The reset member 44 can also be a tension spring, and this disclosure does not limit it.

[0026] Based on the above solutions, this disclosure also provides a drainage system including the aforementioned submersible pump, and the vehicle has all the beneficial effects of the aforementioned cooling plate assembly, which will not be repeated here. The drainage system may include a controller connected to the reset device 4, the second detection element 32, and the third detection element 33. The controller may also be connected to an alarm device, which is not limited in this respect.

[0027] Based on the above solution, this disclosure also provides a compensation method for a drainage system. Using the above drainage system, the compensation method includes the following steps: First, control the submersible pump to be in a closed state. Here, confirming the closed state can be based on the system receiving a closing signal from the submersible pump. After controlling the submersible pump to be in a closed state, the reset device 4 can be activated, causing the valve disc 2 to press against the valve seat 11, forcing the valve disc 2 to reset. This reduces the possibility that the valve disc 2 may not be reset properly due to foreign object jamming or other reasons, thus preventing the submersible pump's check valve from closing normally. This reduces the probability of frequent start-stop of the submersible pump and equipment damage caused by check valve leakage, improves operational safety, and reduces maintenance costs.

[0028] Regarding the control method of the reset device 4, a short-duration (0.5 seconds) high-intensity current pulse can be sent to the electromagnetic coil 42 by the controller. This drives the push rod 43 to impact the valve disc 2 once in the closing direction. This impact force can squeeze out most small foreign objects or sludge particles from the sealing surface and can also overcome the static friction caused by slight jamming. After the push rod 43 impacts the valve disc 2, the reset component 44 can drive the push rod 43 to reset.

[0029] Furthermore, the drainage system also includes a first detection element 31 and a second detection element 32. The first detection element 31 is disposed on the valve disc 2. When the gap between the valve disc 2 and the valve seat 11 is greater than a first preset value, the second detection element 32 can detect the first detection element 31. The compensation method may include the following steps: before the step of controlling the reset device 4 to start and drive the valve disc 2 to press against the valve seat 11, the information of the second detection element 32 can be read, so as to record whether the second detection element 32 has detected the first detection element 31. After the step of controlling the reset device 4 to start and drive the valve disc 2 to press against the valve seat 11, the information of the second detection element 32 can also be read, so as to record whether the second detection element 32 has detected the first detection element 31. That is, the second detection element 32 is activated before and after the reset device 4 impacts the valve disc 2 to record whether the first detection element 31 is detected. By comparing the recorded situation of whether the second detection element 32 has detected the first detection element 31 before and after each activation of the reset device 4, the condition of the valve disc 2 can be judged, and the valve disc 2 can be inspected based on the recorded situation. In addition, when the second detection element 32 includes multiple detection units 321, the information of the second detection element 32 can be continuously read and recorded during the process from the start of the reset device 4 to the reset of the reset device 4, so as to determine the movement change of the valve disc 2.

[0030] Specifically, if the second detection element 32 detects the first detection element 31 both before and after the reset device 4 is started, it proves that the valve disc 2 was not completely closed before and after the reset device 4 was started, the check valve of the submersible pump is mechanically damaged or jammed by foreign objects, the reset device compensation is ineffective, and the seal fails. At this time, the drainage system can be controlled to stop the alarm to remind the operator that the submersible pump needs to be stopped for maintenance.

[0031] If the second detection element 32 does not detect the first detection element 31 before or after the reset device 4 is started, it proves that the valve disc 2 is completely closed before and after the reset device 4 is started, the check valve is closed normally, and the seal is good. At this time, the drainage system can be controlled to record the normal information of the submersible pump, and the equipment can operate normally.

[0032] If the second detection element 32 detects the first detection element 31 before the reset device 4 is started, and the second detection element 32 does not detect the first detection element 31 after the reset device 4 is started, it proves that the valve disc 2 was stuck before the reset device 4 was activated, resulting in incomplete closure. After the reset device 4 impacts, the compensation is successful and the sealing function is restored. At this time, the drainage system can be controlled to record a submersible pump warning information, and a warning signal can also be output simultaneously through a buzzer or voice broadcast. When the number of warning signals output by the submersible pump is too many, the operator can also repair the submersible pump according to the actual situation.

[0033] In this way, the condition of valve disc 2 can be classified according to the test results, which can prevent the submersible pump from operating with problems when there is a serious fault, eliminate the accumulation of minor hidden dangers, reduce unnecessary downtime, take into account the safety and continuity of equipment operation, and improve the operating efficiency and intelligent operation and maintenance level of the drainage system.

[0034] According to one embodiment of this disclosure, after controlling the submersible pump to be in a closed state, the compensation method may further include the following step: after a delay time t, recording whether the second detection element 32 detects the first detection element 31, where t is 2s to 5s. Delaying for 2s to 5s after receiving the submersible pump shutdown signal ensures that the water hammer subsides, thereby avoiding interference with the detection results.

[0035] Alternatively, an ideal fully closed position for valve disc 2 can be set. The drainage system can also continuously record the magnetic flux characteristic value of the "ideal fully closed position" of valve disc 2 after each successful closure and compensation, establishing an operational baseline. Over time, the closed position of valve disc 2 will slowly drift to one side due to wear of the sealing ring. When the monitored position offset exceeds a preset threshold, the drainage system can issue an early warning of "wear on the check valve seal pair, preventive replacement recommended," thus enabling condition-based maintenance.

[0036] For situations where the submersible pump is shut down for extended periods and the ambient temperature is low or prone to corrosion, a structure can be installed on the side of valve disc 2 away from the reset device 4, also equipped with an electromagnetic coil and a push rod. This allows the valve disc 2 to be forcibly opened and maintained at a predetermined minimum opening (e.g., 2-3 mm) by controlling the stroke of the push rod in this structure, creating a controllable micro-leakage channel. This enables extremely small-scale exchange and flow between the water in the drain pipe and the sump, breaking up stagnant water zones and effectively mitigating the risk of frozen or excessively corroded pipes.

[0037] The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0038] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0039] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A submersible pump, characterized in that, This includes a check valve located at the outlet of the submersible pump, the check valve comprising a valve body, a valve disc, and a reset device. A liquid flow channel is formed within the valve body, and a valve seat is provided at the bottom of the channel. The valve disc is disposed in the channel, with one end hinged to the valve body and the other end rotatable about the hinge point with the valve body. When the other end of the valve disc contacts the valve seat, it blocks the flow of liquid in the channel. The reset device is disposed in the channel and includes a base, an electromagnetic coil, and a push rod. The base is connected to the inner wall of the valve body and spaced apart from the valve disc. The electromagnetic coil and the push rod are disposed in the base, and the electromagnetic coil is circumferentially arranged outside the push rod. When the electromagnetic coil is energized, it can provide a force to the push rod close to the valve disc. When the push rod contacts the valve disc, it can provide a force to press the valve disc against the valve seat.

2. The submersible pump according to claim 1, characterized in that, The submersible pump also includes a first detection element and a second detection element. The first detection element is disposed on the valve disc. When the gap between the valve disc and the valve seat is greater than a first preset value, the second detection element can detect the first detection element.

3. The submersible pump according to claim 2, characterized in that, The second detection element includes multiple detection units spaced apart, and all detection units are located on the projection of the movement path of the first detection element onto the side wall of the valve body.

4. The submersible pump according to claim 3, characterized in that, The first detection element is a permanent magnet, and the detection unit is a Hall sensor.

5. The submersible pump according to claim 1, characterized in that, The reset device includes a reset member disposed in the base and capable of providing a force to the push rod away from the valve disc.

6. A drainage system, characterized in that, The submersible pump included in any one of claims 1-5.

7. A compensation method for a drainage system, characterized in that, Using the drainage system of claim 6, the compensation method includes: The submersible pump is controlled to be in the off state; The reset device is activated, causing the valve disc to press against the valve seat.

8. The compensation method for a drainage system according to claim 7, characterized in that, The drainage system further includes a first detection element and a second detection element. The first detection element is disposed on the valve disc. When the gap between the valve disc and the valve seat is greater than a first preset value, the second detection element can detect the first detection element. The compensation method includes: Before the step of controlling the reset device to start and causing the valve disc to press against the valve seat, record whether the second detection element detects the first detection element; After the step of controlling the reset device to start and causing the valve disc to press against the valve seat, the system records whether the second detection element detects the first detection element.

9. The compensation method for a drainage system according to claim 8, characterized in that, The compensation method includes: If the second detection element detects the first detection element both before and after the reset device is started, the drainage system will be controlled to stop and alarm. If the second detection element fails to detect the first detection element both before and after the reset device is activated, the drainage system is controlled to record normal submersible pump information. If the second detection element detects the first detection element before the reset device is activated, and the second detection element fails to detect the first detection element after the reset device is activated, the drainage system is controlled to record a submersible pump warning message.

10. The compensation method for a drainage system according to claim 8, characterized in that, After the step of controlling the submersible pump to be in a closed state, the compensation method includes: After a delay time t, the system records whether the second detection device detects the first detection device, where t is 2s to 5s.

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