Explosion-proof permanent magnet immersed electric pump

Abstract

The invention relates to the technical field of electric pumps, in particular to an explosion-proof permanent magnet immersed electric pump. An explosion-proof permanent magnet immersed electric pump comprises a pump body, a cleaning mechanism, an adjusting mechanism and a limiting mechanism, the pump body comprises a support, a main shaft and a filter cartridge, and a mounting cavity is formed in the support. The cleaning mechanism comprises a connecting ring and a cleaning pipe, and a liquid outlet hole is formed in the cleaning pipe. The adjusting mechanism comprises a connecting cylinder, an auxiliary impeller and a friction ring. When the internal pressure of the filter cartridge rises to a preset value due to blockage of the filter cartridge, the limiting mechanism relieves axial limiting on the connecting cylinder, and the connecting cylinder and the main shaft synchronously rotate at the moment. Along with the increase of the rotating speed of the auxiliary impeller, the liquid in the mounting cavity is accelerated to be pressed into the cleaning pipe, and the flow rate of the liquid flowing to the liquid outlet hole is increased, so that the filter cartridge is better cleaned. The invention provides an explosion-proof permanent magnet submersible electric pump to solve the problem that long-term reliable operation of equipment is affected due to the fact that thick impurities are not thoroughly removed by a filter cartridge cleaning mechanism of an existing permanent magnet submersible electric pump, and blockage is easily caused.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of electric pumps, in particular to a flameproof permanent magnet submerged electric pump. BACKGROUND

[0002] The permanent magnet submerged electric pump is a special pump that highly integrates an efficient permanent magnet synchronous motor and a pump body and is completely immersed in a transported liquid for work. The core function thereof is to safely, efficiently and low-noise complete liquid extraction, transportation and pressurization in various storage tanks or groove bodies, and is particularly suitable for occasions with limited space, strict leakage prevention requirements or direct cooling of the motor by the medium. According to the physicochemical properties (such as flammability, low temperature and strong corrosion) of the transported medium and the different application scenarios, the main types thereof can be divided into explosion-proof types (such as a gas station submerged pump), chemical corrosion-resistant types, ultra-low temperature types (such as an LNG submerged pump) and general efficient types. Among them, the flameproof permanent magnet submerged electric pump is an important branch in the explosion-proof category, which is equipped with a flameproof shell meeting strict standards to ensure safe and reliable operation in a flammable and explosive liquid environment.

[0003] For example, the patent application with the publication number CN119084325A provides a water-filled cooling permanent magnet submerged electric pump, which aims to drive a scraper to clean the surface of the filter cartridge in real time through the built-in cleaning device to maintain the smoothness of the cooling channel. However, this cleaning mechanism mainly targets the surface of the filter cartridge, and when the medium contains sticky impurities, the scraper may not be able to completely remove the attachments, and there is a potential limitation of incomplete cleaning and reduced filtration efficiency in long-term operation. SUMMARY

[0004] The application provides a flameproof permanent magnet submerged electric pump to solve the problem that the existing permanent magnet submerged electric pump is prone to blockage due to incomplete removal of viscous impurities by the filter cartridge cleaning mechanism, thereby affecting the long-term reliable operation of the equipment.

[0005] The flameproof permanent magnet submerged electric pump of the application adopts the following technical scheme: a flameproof permanent magnet submerged electric pump includes a pump main body, a cleaning mechanism, an adjusting mechanism and a limiting mechanism. The pump main body includes a support, a main shaft and a filter cartridge. An installation cavity communicating with the outside is formed in the support. The main shaft is vertically arranged and rotatably arranged on the support. The filter cartridge is arranged on the support and coaxial with the main shaft.

[0006] The cleaning mechanism includes a connecting ring and a plurality of cleaning pipes distributed along the circumference of the main shaft. The connecting ring is rotatably arranged on the support. The cleaning pipes are arranged on the connecting ring and communicate with the installation cavity, and the cleaning pipes are provided with liquid outlets.

[0007] The adjusting mechanism comprises a connecting cylinder, a secondary impeller and a friction ring. The connecting cylinder is rotatably arranged on the main shaft, coaxial with the main shaft and inside the filter cylinder. The secondary impeller is arranged at the lower end of the connecting cylinder and inside the installation cavity, for accelerating the liquid flow inside the installation cavity to the cleaning pipe. The friction ring is arranged on the main shaft, coaxial with the main shaft. The friction ring is inside the installation cavity and below the secondary impeller.

[0008] The adjusting mechanism has a first state and a second state. In the first state, the secondary impeller and the friction ring are out of contact, and the connecting cylinder and the main shaft rotate relatively. In the second state, the secondary impeller and the friction ring are in contact with each other, so that the connecting cylinder and the main shaft rotate synchronously. The limiting mechanism is used to limit the movement of the connecting cylinder when the pressure inside the filter cylinder does not exceed the predetermined value. When the filter cylinder is blocked and the internal pressure rises to the predetermined value, the limiting mechanism releases the limiting of the connecting cylinder. Under the action of the internal pressure and gravity of the filter cylinder, the connecting cylinder drives the secondary impeller to move downward synchronously until the secondary impeller and the friction ring are in contact, and the adjusting mechanism switches from the first state to the second state.

[0009] Further, the limiting mechanism comprises a fixed spring plate, which is fixedly arranged on the main shaft and above the friction ring. When the adjusting mechanism is in the first state, the upper side of the connecting cylinder abuts against the fixed spring plate. When the adjusting mechanism is in the second state, the upper end of the connecting cylinder is out of contact with the fixed spring plate.

[0010] Further, the limiting mechanism further comprises an adjusting ring and a limiting assembly. The adjusting ring is slidably arranged in the connecting cylinder and slidably sleeved on the main shaft. The adjusting ring and the main shaft are coaxial, and the main shaft can drive the adjusting ring to rotate.

[0011] The adjusting ring divides the internal space of the connecting cylinder into a first chamber at the upper part and a second chamber at the lower part. The first chamber is in communication with the filter cylinder, and the second chamber is a sealed air chamber. When the main shaft is stationary, the adjusting ring can slide axially along itself. At this time, the pressure change inside the filter cylinder drives the adjusting ring to slide axially to change the volume of the first chamber, so as to balance the pressure between the first chamber and the second chamber. The limiting assembly is arranged on the adjusting ring. When the main shaft rotates, the limiting assembly works to axially lock the adjusting ring with the main shaft. At this time, the pressure change inside the filter cylinder drives the connecting cylinder to move axially, and then the upper end of the connecting cylinder can be out of contact with the fixed spring plate.

[0012] Further, the limiting assembly comprises a plurality of limiting units distributed along the circumference of the adjusting ring. Each limiting unit comprises a rotating rod and a counterweight. The rotating rod is arranged along the axial direction of the adjusting ring and is rotatably arranged on the connecting ring. Each counterweight is fixedly arranged on the rotating rod, and the counterweight has a friction surface in contact with the surface of the main shaft. When the adjusting ring rotates, the counterweight rotates under the action of centrifugal force, so that the friction surface presses the main shaft, thereby realizing the axial locking of the adjusting ring and the main shaft.

[0013] Furthermore, each limiting unit also includes a reset spring, which is fixedly mounted on the connecting ring. The reset spring abuts against the counterweight, and is used to reset the counterweight after it stops rotating.

[0014] Furthermore, a main impeller is fixedly installed at one end of the main shaft.

[0015] Furthermore, the pump body also includes a base, which is fixedly connected to a bracket. The end of the main shaft furthest from the main impeller is rotatably mounted on the base.

[0016] An explosion-proof permanent magnet submersible pump also includes a drive mechanism, which comprises a stator and a rotor, both housed within a base. The rotor is fixedly connected to the main shaft, and the stator surrounds the outside of the rotor. A power supply cable is connected to the stator, enabling it to drive the rotor to rotate when energized.

[0017] Furthermore, multiple heat dissipation pipes are installed inside the machine base, and these pipes are distributed sequentially along the circumference of the main shaft. The heat dissipation pipes are used to dissipate heat from the stator and rotor.

[0018] Furthermore, the mounting cavity is located at the lower part of the bracket, and a heat-conducting plate is installed inside the base. The heat-conducting plate is located on the upper side of the base and is used to conduct the heat generated by the drive mechanism to the liquid in the mounting cavity.

[0019] Furthermore, the axial direction of the liquid outlet is inclined relative to the cleaning tube. When the liquid is ejected through the liquid outlet, the resulting recoil force will create a force that pushes the cleaning tube and the connecting ring to rotate circumferentially.

[0020] The beneficial effects of this invention are as follows: In the explosion-proof permanent magnet submersible pump of this invention, the adjusting mechanism is initially in a first state, with the main shaft rotating relative to the connecting cylinder. When the filter cartridge becomes clogged, causing its internal pressure to rise to a predetermined value, the limiting mechanism releases the axial restriction on the connecting cylinder. Under the action of the internal pressure and gravity of the filter cartridge, the connecting cylinder drives the auxiliary impeller to move downwards synchronously until the auxiliary impeller contacts the friction ring. At this point, the adjusting mechanism switches from the first state to the second state. At this time, the auxiliary impeller and the friction ring contact each other, and the frictional force drives the connecting cylinder to rotate synchronously with the main shaft.

[0021] As the speed of the secondary impeller increases significantly, the liquid in the mounting cavity is accelerated and forced into the cleaning pipe, and the liquid velocity flowing towards the outlet hole increases accordingly, thus enhancing the jet impact force. This high-speed liquid flow directionally washes the surface of the filter cartridge, effectively removing sticky impurities adhering to the filter screen, restoring its filtration performance, and achieving automatic cleaning function in case of clogging. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of an explosion-proof permanent magnet submersible pump provided in an embodiment of the present invention; Figure 2 A cross-sectional view of an explosion-proof permanent magnet submersible pump provided in an embodiment of the present invention; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 for Figure 3 Enlarged view of point B in the middle; Figure 5 This is a partial structural cross-sectional view of an explosion-proof permanent magnet submersible pump provided in an embodiment of the present invention; Figure 6 for Figure 5 Enlarged view of point C in the middle; Figure 7 for Figure 5 Enlarged view of point D in the middle; Figure 8 for Figure 5 Enlarged view at point E in the middle; Figure 9 This is a partial cross-sectional view of the regulating ring of an explosion-proof permanent magnet submersible pump provided in an embodiment of the present invention.

[0024] In the diagram: 101, base; 104, power supply cable; 105, filter cartridge; 107, main impeller; 108, bracket; 109, stator; 110, rotor; 201, main shaft; 202, friction ring; 301, heat dissipation pipe; 302, heat conduction plate; 304, connecting ring; 305, cleaning pipe; 306, connecting cylinder; 307, liquid outlet; 308, fixing spring; 309, auxiliary impeller; 310, adjusting ring; 311, rotating rod; 312, counterweight; 313, reset spring; 320, first chamber; 330, second chamber; 340, mounting cavity. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Reference Figures 1 to 9 As shown in the figure, an explosion-proof permanent magnet submersible pump provided in this embodiment of the invention includes a pump body, a cleaning mechanism, an adjusting mechanism, and a limiting mechanism. The pump body includes a bracket 108, a main shaft 201, and a filter cartridge 105. The bracket 108 has a mounting cavity 340 communicating with the outside. The main shaft 201 is vertically arranged and rotatably mounted on the bracket 108. The filter cartridge 105 is mounted on the bracket 108 and is coaxial with the main shaft 201.

[0027] The cleaning mechanism includes a connecting ring 304 and multiple cleaning tubes 305. The connecting ring 304 is coaxially arranged with the main shaft 201 and rotatably mounted on the bracket 108. The cleaning tubes 305 are fixedly mounted on the connecting ring 304, and the multiple cleaning tubes 305 are distributed circumferentially along the main shaft 201. The cleaning tubes 305 are inclined and gradually approach the main shaft 201 from top to bottom. The cleaning tubes 305 communicate with the mounting cavity 340, and each cleaning tube 305 has multiple liquid outlet holes 307, which are distributed sequentially along the axial direction of the cleaning tube 305.

[0028] The adjusting mechanism includes a connecting cylinder 306, an auxiliary impeller 309, and a friction ring 202. The connecting cylinder 306 is rotatably mounted on the main shaft 201, coaxial with the main shaft 201, and located within the filter cartridge 105. The auxiliary impeller 309 is fixedly mounted at the lower end of the connecting cylinder 306 and located within the mounting cavity 340, used to accelerate the flow of liquid within the mounting cavity 340 towards the cleaning pipe 305. The friction ring 202 is fixedly mounted on the main shaft 201 and coaxial with it. The friction ring 202 is located within the mounting cavity 340 and below the auxiliary impeller 309.

[0029] The adjusting mechanism has a first state and a second state. In the first state, the auxiliary impeller 309 and the friction ring 202 are out of contact, and the connecting cylinder 306 and the main shaft 201 can rotate relative to each other, with the rotational speed of the main shaft 201 being greater than that of the connecting cylinder 306. In the second state, the auxiliary impeller 309 and the friction ring 202 are in contact with each other, and the connecting cylinder 306 rotates synchronously with the main shaft 201 through frictional transmission. The limiting mechanism is used to restrict the axial downward movement of the connecting cylinder 306 when the pressure inside the filter cartridge 105 does not exceed a predetermined value. When the filter cartridge 105 becomes clogged, causing its internal pressure to rise to the predetermined value, the limiting mechanism releases the axial restriction on the connecting cylinder 306. Under the action of the internal pressure and gravity of the filter cartridge 105, the connecting cylinder 306 drives the auxiliary impeller 309 to move synchronously downward until the auxiliary impeller 309 and the friction ring 202 contact, at which point the adjusting mechanism switches from the first state to the second state.

[0030] Initially, the adjusting mechanism is in the first state, with the main shaft 201 rotating relative to the connecting cylinder 306. When the filter cartridge 105 becomes clogged, causing its internal pressure to rise to a predetermined value, the limiting mechanism releases the axial restriction on the connecting cylinder 306. Under the influence of the internal pressure and gravity of the filter cartridge 105, the connecting cylinder 306 drives the auxiliary impeller 309 to move downwards synchronously until the auxiliary impeller 309 contacts the friction ring 202. At this point, the adjusting mechanism switches from the first state to the second state. The auxiliary impeller 309 and the friction ring 202 then contact each other, and through frictional transmission, the connecting cylinder 306 rotates synchronously with the main shaft 201.

[0031] As the rotational speed of the secondary impeller 309 increases significantly, the liquid in the mounting cavity 340 is accelerated and forced into the cleaning pipe 305, and the liquid flow velocity towards the outlet hole 307 increases accordingly, thus enhancing the jet impact force. This high-speed liquid flow directionally washes the surface of the filter cartridge 105, effectively removing sticky impurities adhering to the filter screen, restoring its filtration performance, and realizing the automatic cleaning function in case of blockage.

[0032] In this embodiment, the limiting mechanism includes a fixing spring 308, which is fixedly mounted on the main shaft 201 and positioned above the friction ring 202. When the adjustment mechanism is in the first state, the upper side of the connecting cylinder 306 abuts against the fixing spring 308. When the adjustment mechanism is in the second state, the upper end of the connecting cylinder 306 disengages from the fixing spring 308.

[0033] In this embodiment, the limiting mechanism further includes an adjusting ring 310 and a limiting assembly. The adjusting ring 310 is slidably disposed within the connecting cylinder 306 and slidably sleeved on the main shaft 201. The adjusting ring 310 and the main shaft 201 are coaxially arranged. A first sealing strip is provided on the inner side of the adjusting ring 310, and a second sealing strip is provided on the outer side of the adjusting ring 310. A third sealing strip is provided on the lower side of the connecting cylinder 306, and the third sealing strip abuts against the main shaft 201. The static friction between the third sealing strip and the main shaft 201 is equal to the static friction between the second sealing strip and the connecting cylinder 306. The static friction between the first sealing strip and the main shaft 201 is greater than the static friction between the second sealing strip and the connecting cylinder 306, so that when the main shaft 201 starts to rotate, it can drive the adjusting ring 310 to rotate, and the adjusting ring 310 rotates relative to the connecting cylinder 306.

[0034] The adjusting ring 310 divides the internal space of the connecting cylinder 306 into an upper first chamber 320 and a lower second chamber 330. The first chamber 320 is connected to the filter cartridge 105, and the second chamber 330 is a sealed air chamber. When the main shaft 201 is stationary, the adjusting ring 310 can slide along its own axial direction. At this time, the pressure change inside the filter cartridge 105 drives the adjusting ring 310 to slide axially, thereby changing the volume of the first chamber 320 and thus balancing the pressure between the first chamber 320 and the second chamber 330. A limiting component is provided on the adjusting ring 310. When the main shaft 201 rotates, the limiting component works to lock the adjusting ring 310 axially with the main shaft 201. At this time, the pressure change inside the filter cartridge 105 drives the connecting cylinder 306 to move axially, thereby allowing the upper end of the connecting cylinder 306 to disengage from the fixing spring 308.

[0035] In this embodiment, the limiting assembly includes multiple limiting units distributed circumferentially along the adjusting ring 310. Each limiting unit includes a rotating rod 311 and a counterweight 312. The rotating rod 311 is arranged axially along the adjusting ring 310 and rotatably mounted on the connecting ring 304. Each counterweight 312 is fixedly mounted on the rotating rod 311 and has a friction surface that contacts the surface of the main shaft 201. The friction surface is located on one side of the counterweight 312 along the radial direction of the rotating rod 311. The counterweight 312 and the rotating rod 311 are eccentrically arranged, and the weight of the side of the counterweight 312 with the friction surface is greater than the weight of the other side of the counterweight 312 along the radial direction of the rotating rod 311.

[0036] When the adjusting ring 310 rotates, the counterweight 312 rotates under the action of centrifugal force, causing the friction surface to press against the main shaft 201, thereby achieving axial locking between the adjusting ring 310 and the main shaft 201.

[0037] In this embodiment, each limiting unit further includes a reset spring 313, which is fixedly mounted on the connecting ring 304. The reset spring 313 abuts against the counterweight 312. When the adjusting ring 310 rotates, the counterweight 312 rotates under centrifugal force, and the counterweight 312 presses against the reset spring 313, causing the reset spring 313 to deform. Then, when the adjusting ring 310 stops rotating, the reset spring 313 resets and drives the counterweight 312 to reset.

[0038] In this embodiment, a main impeller 107 is fixedly installed at one end of the main shaft 201. When the main shaft 201 rotates, it drives the main impeller 107 to rotate. The main impeller 107 generates low pressure for water intake and high pressure for water delivery through high-speed rotation, converting the rotational force of the main shaft 201 into the flow power of water.

[0039] In this embodiment, the pump body also includes a base 101, which is fixedly connected to a bracket 108. The end of the main shaft 201 away from the main impeller 107 is rotatably mounted on the base 101.

[0040] An explosion-proof permanent magnet submersible pump also includes a drive mechanism, which comprises a stator 109 and a rotor 110. The stator 109 and rotor 110 are disposed within a base 101. The rotor 110 is fixedly connected to a main shaft 201, and the stator 109 surrounds the outside of the rotor 110. The stator 109 is connected to a power supply cable 104, which drives the rotor 110 to rotate when energized.

[0041] In this embodiment, a plurality of heat dissipation pipes 301 are provided inside the base 101, and the plurality of heat dissipation pipes 301 are distributed sequentially along the circumference of the main shaft 201. The heat dissipation pipes 301 are used to dissipate heat from the stator 109 and the rotor 110.

[0042] In this embodiment, the mounting cavity 340 is located at the lower part of the bracket 108, and a heat-conducting plate 302 is provided inside the base 101. The heat-conducting plate 302 is located on the upper side of the base 101 and is used to conduct the heat generated by the drive mechanism to the liquid in the mounting cavity 340.

[0043] In this embodiment, a cavity is formed on the connecting ring 304, and the cavity is coaxially arranged with the connecting ring 304, communicating with the cleaning tube 305. Multiple liquid outlet channels are also formed on the bracket 108, communicating with the mounting cavity 340 and the cavity. The axis of the liquid outlet 307 is inclined relative to the cleaning tube 305. When liquid is ejected through the liquid outlet 307, the resulting recoil force creates a force that pushes the cleaning tube 305 and the connecting ring 304 to rotate circumferentially, thereby expanding the scouring range.

[0044] Working process: In the initial state, the adjusting mechanism is in the first state, and the upper side of the connecting cylinder 306 abuts against the fixed spring 308. The counterweight 312 and the main shaft 201 are not in contact. The first chamber 320 is connected to the filter cartridge 105, and the air pressure in the second chamber 330 is the same as that in the first chamber 320.

[0045] After the device is placed in the liquid, the external liquid enters the filter cartridge 105 and then the first chamber 320, increasing its internal pressure and exceeding that of the second chamber 330. The liquid then pushes the adjusting ring 310 downwards, compressing the volume of the second chamber 330. The internal pressure of the second chamber 330 subsequently increases until it reaches equilibrium with the pressure of the first chamber 320. Due to the varying liquid depths, the pressure inside the filter cartridge 105 changes accordingly, and the movement distance of the adjusting ring 310 also changes, thus achieving adaptive adjustment for different liquid depths.

[0046] Next, the stator 109 is energized. After the stator 109 is energized, it drives the rotor 110 to rotate. The rotor 110 drives the main shaft 201 to rotate synchronously. When the main shaft 201 rotates, it drives the main impeller 107 to rotate, thus starting the operation.

[0047] The first sealing strip on the adjusting ring 310 is in frictional contact with the main shaft 201. Therefore, when the main shaft 201 rotates, it can drive the adjusting ring 310 to rotate as well. When the adjusting ring 310 rotates, under the action of centrifugal force, the counterweight 312 and the rotating rod 311 rotate, causing the friction surface to press against the main shaft 201, thereby achieving axial locking between the adjusting ring 310 and the main shaft 201. At this time, the main shaft 201 drives the adjusting ring 310 to rotate synchronously, and the adjusting ring 310 rotates relative to the connecting cylinder 306.

[0048] A secondary impeller 309 is installed on the connecting cylinder 306. When liquid passes through the secondary impeller 309, it drives the secondary impeller 309 to rotate, which in turn drives the connecting cylinder 306 to rotate. At this time, the rotation speed of the connecting cylinder 306 is less than the rotation speed of the main shaft 201. When the secondary impeller 309 rotates, it draws the liquid in the filter cartridge 105 into the mounting cavity 340, flows into the annular cavity through the liquid outlet channel, then enters the cleaning pipe 305, and finally is discharged outward through the liquid outlet hole 307.

[0049] When the filter cartridge 105 becomes clogged, causing its internal pressure to rise to a predetermined value, the pressure in the first chamber 320 further increases. Since the adjusting ring 310 cannot move, the connecting cylinder 306 will overcome the elastic force of the fixed spring 308 and move downwards, increasing the volume of the second chamber 330. After moving downwards, the connecting cylinder 306 contacts the friction ring 202, achieving synchronous rotation with the main shaft 201. At this point, the adjusting mechanism enters the second state.

[0050] After the connecting cylinder 306 rotates synchronously with the main shaft 201, the rotational speed of the connecting cylinder 306 and the auxiliary impeller 309 increases, thereby increasing the flow velocity of the liquid in the mounting cavity 340 towards the cleaning pipe 305, and further enhancing the impact force of the liquid discharged from the outlet hole 307. The inclined outlet hole 307 causes the sprayed liquid to generate a reaction force on the cleaning pipe 305, pushing the cleaning pipe 305 and the connecting ring 304 to rotate, achieving comprehensive rinsing of all positions of the filter cartridge 105.

[0051] After cleaning, the pressure inside the filter cartridge 105 returns to normal, and the pressure in the first chamber 320 decreases. Under the pressure of the second chamber 330, the connecting cylinder 306 moves upward and resets, preventing the auxiliary impeller 309 from idling in a non-clogging state and saving energy.

[0052] The continuous flow of liquid within the mounting cavity 340 serves as an effective heat dissipation medium for cooling the heat-conducting plate 302. The heat-conducting plate 302 further conducts the absorbed heat to the heat dissipation pipe 301, providing auxiliary heat dissipation for key heat-generating components such as the stator 109 and rotor 110, thus forming a multi-stage heat dissipation path. This design effectively prevents heat accumulation and abnormal temperature rise inside the base 101 due to clogging of the filter cartridge 105, which could lead to decreased equipment performance or damage. When the liquid flow rate within the mounting cavity 340 increases, the heat exchange efficiency between the fluid and the heat-conducting plate 302 simultaneously improves, significantly enhancing the heat dissipation rate and further ensuring the thermal stability and operational reliability of the equipment under high-temperature or high-load conditions.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An explosion-proof permanent magnet submersible pump, characterized in that: It includes a pump body, a cleaning mechanism, an adjusting mechanism, and a limiting mechanism; the pump body includes a bracket, a main shaft, and a filter cartridge; the bracket has an installation cavity that communicates with the outside; the main shaft is vertically set and rotatably mounted on the bracket; the filter cartridge is mounted on the bracket and is coaxial with the main shaft; The cleaning mechanism includes a connecting ring and multiple cleaning tubes circumferentially distributed along the main shaft; the connecting ring is rotatably mounted on the bracket; the cleaning tubes are mounted on the connecting ring and communicate with the mounting cavity, and the cleaning tubes are provided with liquid outlet holes; The adjusting mechanism includes a connecting cylinder, a secondary impeller, and a friction ring. The connecting cylinder is rotatably mounted on the main shaft, coaxial with the main shaft, and located inside the filter cartridge. The secondary impeller is located at the lower end of the connecting cylinder and within the mounting cavity, used to accelerate the flow of liquid in the mounting cavity towards the cleaning pipe. The friction ring is mounted on the main shaft and coaxial with the main shaft. The friction ring is located within the mounting cavity and below the secondary impeller. The adjusting mechanism has a first state and a second state. In the first state, the auxiliary impeller and the friction ring are out of contact, and the connecting cylinder and the main shaft rotate relative to each other. In the second state, the auxiliary impeller and the friction ring are in contact with each other, so that the connecting cylinder and the main shaft rotate synchronously. The limiting mechanism is used to restrict the movement of the connecting cylinder when the pressure inside the filter cylinder does not exceed a predetermined value. When the filter cylinder is blocked, causing its internal pressure to rise to the predetermined value, the limiting mechanism releases the limiting of the connecting cylinder. Under the action of the internal pressure and gravity of the filter cylinder, the connecting cylinder drives the auxiliary impeller to move downward synchronously until the auxiliary impeller and the friction ring are in contact. Then, the adjusting mechanism switches from the first state to the second state.

2. The explosion-proof permanent magnet submersible pump according to claim 1, characterized in that: The limiting mechanism includes a fixed spring, which is fixedly mounted on the main shaft and positioned above the friction ring. When the adjusting mechanism is in the first state, the upper side of the connecting cylinder abuts against the fixed spring. When the adjusting mechanism is in the second state, the upper end of the connecting cylinder disengages from the fixed spring.

3. The explosion-proof permanent magnet submersible pump according to claim 1, characterized in that: The limiting mechanism also includes an adjusting ring and a limiting component. The adjusting ring is slidably disposed inside the connecting cylinder and slidably sleeved on the main shaft. The adjusting ring and the main shaft are coaxially arranged, and the main shaft can drive the adjusting ring to rotate. The adjusting ring divides the internal space of the connecting cylinder into an upper first chamber and a lower second chamber. The first chamber is connected to the filter cartridge, and the second chamber is a sealed air chamber. When the main shaft is stationary, the adjusting ring can slide along its own axis. At this time, the pressure change inside the filter cartridge drives the adjusting ring to slide axially, thereby changing the volume of the first chamber and balancing the pressure between the first and second chambers. The limiting component is set on the adjusting ring. When the main shaft rotates, the limiting component works to lock the adjusting ring axially with the main shaft. At this time, the pressure change inside the filter cartridge drives the connecting cylinder to move axially, thereby allowing the upper end of the connecting cylinder to disengage from the fixed spring.

4. The explosion-proof permanent magnet submersible pump according to claim 3, characterized in that: The limiting assembly includes multiple limiting units distributed circumferentially along the adjusting ring. Each limiting unit includes a rotating rod and a counterweight. The rotating rod is arranged axially along the adjusting ring and is rotatably mounted on the connecting ring. Each counterweight is fixedly mounted on the rotating rod and has a friction surface that contacts the surface of the main shaft. When the adjusting ring rotates, the counterweight rotates under the action of centrifugal force, causing the friction surface to press against the main shaft, thereby achieving axial locking between the adjusting ring and the main shaft.

5. The explosion-proof permanent magnet submersible pump according to claim 4, characterized in that: Each limiting unit also includes a reset spring, which is fixedly mounted on the connecting ring; the reset spring abuts against the counterweight, and the reset spring is used to reset the counterweight after it stops rotating.

6. The explosion-proof permanent magnet submersible pump according to claim 1, characterized in that: A main impeller is fixedly installed at one end of the main shaft.

7. The explosion-proof permanent magnet submersible pump according to claim 6, characterized in that: The pump body also includes a base, which is fixedly connected to a bracket; the end of the main shaft away from the main impeller is rotatably mounted on the base; an explosion-proof permanent magnet submersible pump also includes a drive mechanism, which includes a stator and a rotor, which are mounted inside the base, the rotor and the main shaft are fixedly connected, and the stator surrounds the outside of the rotor; the stator is connected to a power supply cable, which can drive the rotor to rotate when energized.

8. The explosion-proof permanent magnet submersible pump according to claim 7, characterized in that: Multiple heat dissipation pipes are installed inside the machine base, and these pipes are distributed sequentially along the circumference of the main shaft; the heat dissipation pipes are used to dissipate heat from the stator and rotor.

9. The explosion-proof permanent magnet submersible pump according to claim 8, characterized in that: The mounting cavity is located at the lower part of the bracket, and a heat-conducting plate is installed inside the base. The heat-conducting plate is located on the upper side of the base and is used to conduct the heat generated by the drive mechanism to the liquid in the mounting cavity.

10. The explosion-proof permanent magnet submersible pump according to claim 1, characterized in that: The axial direction of the liquid outlet is inclined relative to the cleaning pipe; when the liquid is ejected through the liquid outlet, the resulting recoil force will generate a force that pushes the cleaning pipe and the connecting ring to rotate circumferentially.

Images