An automatic silt flushing self-priming single-stage single-suction pit centrifugal pump

Abstract

The present invention discloses an automatic silt flushing and self-priming single-stage single-suction pit centrifugal pump, which belongs to the technical field of centrifugal pumps and solves the problems in the prior art of being unable to automatically mix, suspend and flush silt, inconvenient to transport slurry with easily precipitated particles, and inconvenient overall maintenance. The pump comprises a power motor, the rotating shaft at the bottom of the power motor is connected to the pump shaft after passing through an adjustment liquid retaining plate mounted on the surface of the pump cover, a mechanical seal assembly is provided on the periphery of the pump shaft, an impeller is connected to the bottom, the bottom of the pump cover is connected to the pump body, and the bottom of the pump body is connected to the self-priming silt flushing pump chamber. The present invention is based on the principle of gas-liquid coexistence, balanced irrigation and self-priming, and its additional automatic mixing, suspending and flushing silt function, and the design concept of a built-in containerized single-end face non-flushing, self-circulating cooling mechanical seal assembly for the shaft seal of a vertical self-priming centrifugal pump, eliminating the various types of complex and cumbersome engineering machinery used when mixing, suspending and flushing silt and pumping and transporting various easily precipitated solid-liquid two-phase bodies or various complex and harsh mixed liquid media containing slurry with easily precipitated particles.

Description

Technical Field

[0001] The present invention belongs to the technical field of centrifugal pumps, and in particular relates to an automatic silt flushing and self-priming single-stage single-suction pit centrifugal pump. Background Art

[0002] Mixed liquid media containing easily precipitated solid-liquid two-phase media or various complex and harsh slurries containing easily precipitated particles currently on the market require mixing, suspending, and pumping and transporting. Common methods include: using a submersible centrifugal pump or a sealless self-priming centrifugal pump to pump and transport the liquid above the easily precipitated slurry, followed by a dredging machine to remove the settled slurry below; or installing a mixing, suspending, and stirring machine above the liquid medium in a pit, ditch, or river channel to suspend the easily precipitated slurry in the liquid medium, followed by a submersible sewage centrifugal pump or a vertical long-axis submersible sewage centrifugal pump to transport the mixed and suspended particle-containing liquid; or using a high-pressure silt-flushing centrifugal pump fed with clean water to mix, suspend, and flush the slurry, followed by a submersible sewage centrifugal pump or a vertical long-axis submersible sewage centrifugal pump to transport the mixed and suspended particle-containing liquid. However, these methods are not only time-consuming and labor-intensive, but also subject to high levels of equipment wear. Therefore, a centrifugal pump that can automatically mix, suspend, flush, and pump and transport easily precipitated slurry is needed. Summary of the Invention

[0003] The purpose of the present invention is to address the deficiencies in the prior art and provide an automatic silt flushing, self-priming, single-stage, single-suction pit centrifugal pump that can automatically mix, suspend, flush, and transport slurry with easily precipitated particles and is easy to overhaul.

[0004] In order to achieve the above technical objectives, the technical solution adopted by the automatic silt flushing self-priming single-stage single-suction pit centrifugal pump of the present invention is:

[0005] An automatic silt flushing, self-priming, single-stage, single-suction pit centrifugal pump, based on the principle of gas-liquid coexistence, balanced irrigation and suction, self-priming and its additional automatic mixing, suspension and silt flushing function, and the design concept of a built-in containerized single-end face, non-flushing, self-circulating cooling mechanical seal assembly for the shaft seal of a vertical self-priming centrifugal pump, including a power motor, the bottom two sides of which are connected to the surface of the pump cover through fastening bolts, the rotating shaft at the bottom of the power motor passes through an adjustment liquid baffle mounted on the surface of the pump cover and is connected to the pump shaft, the outer periphery of the pump shaft is provided with a mechanical seal assembly that conflicts with the pump cover, and the bottom is connected with a mechanical seal assembly. The impeller is connected with the impeller fastening bolts, and a guard plate is pressed on the surface of the impeller. The guard plate is fixed in the stop groove by the pump cover and the pump body. The pump shaft extends along the middle of the pump cover, and the bottom of the pump cover is connected to the pump body. The bottom of the pump body is connected to the self-priming flushing pump chamber. The self-priming flushing pump chamber includes a balanced irrigation and suction liquid storage chamber and a gas-liquid common storage liquid chamber arranged in sequence from top to bottom. A discharge port is provided on one side of the balanced irrigation and suction liquid storage chamber, a balanced flushing and silting flow pipe is provided on the other side, and an impeller inlet short pipe is provided at the bottom that is inserted into the gas-liquid common storage liquid chamber. A suction port is provided at the upper end of one side of the gas-liquid storage chamber, and a water injection and emptying tee is provided at the lower end. The balancing flushing and silt flow pipe is connected to the suction port through the balancing flow nozzle pipe on its surface. The balancing flushing and silt flow pipe is fixed in the self-priming flushing and silt lower suction pipe through the flushing and silt flow transition joint hose sleeved on its surface. One end of the self-priming flushing and silt lower suction pipe is connected to the suction port, and a flushing chamber is provided at the lower part of the other end. Flushing nozzles are evenly distributed on the outer circular wall of the flushing chamber. The balancing flushing and silt flow pipe plays a role in balancing the liquid surface pressure between the suction port and the discharge port of the self-priming flushing and silt pump chamber. , to prevent the liquid in the self-priming flushing and silting pump chamber from being siphoned, thereby ensuring the stability of the self-priming performance of the self-priming pump. On the other hand, it plays a role in automatically transporting the sucked mixed suspended liquid at the bottom of the pit to the flushing and silting flow pipe of the self-priming flushing and silting lower suction pipe through the flushing and silting flow transition joint hose until it reaches the flushing and silting chamber. The self-priming flushing and silting lower suction pipe includes an outlet end flow short section elbow, a liquid flow pipe and a flushing and silting chamber connected in sequence. A flushing and silting flow pipe is inserted into the outlet end flow short section elbow along the extension direction, and a filter is provided at the end of the liquid flow pipe and the surface of the flushing and silting chamber.

[0006] The cam is pressed against the pump cover to release the piston, and the piston rod is pressed against the piston rod to release the piston rod, so that the piston rod can be kept in a state of sealing and can be used for pumping.

[0007] Preferably, the principle of gas-liquid coexistence balanced irrigation and self-priming and its additional automatic mixing, suspension and silt flushing function includes the following steps:

[0008] Before starting the S1 centrifugal pump, first fill the self-priming pump chamber with liquid. At this time, there is a certain amount of air in the self-priming pump lower suction pipe between the liquid level in the self-priming pump chamber and the liquid level of the pit medium.

[0009] After the S2 self-priming silt flushing centrifugal pump is started, the impeller uses the stored liquid in the self-priming silt flushing pump chamber to suck. At this time, the impeller begins to discharge liquid into the balance suction and slurry storage chamber of the self-priming silt flushing pump chamber. The liquid flows into the silt flushing chamber of the self-priming silt flushing lower suction pipe through the balance silt flushing flow pipe and the silt flushing flow pipe of the self-priming silt flushing lower suction pipe;

[0010] As the working pressure of the S3 impeller increases, the liquid entering the silt flushing chamber is flushed toward the slurry deposited at the bottom of the pit through the silt flushing nozzles, and begins to form an automatic mixed suspended silt flushing. At the same time, the air in the self-priming silt flushing lower suction pipe becomes thinner, gradually approaching a vacuum, driving the mixed suspended liquid in the pit to rise to the upper part of the self-priming silt flushing lower suction pipe;

[0011] S4 When all the air in the lower suction pipe of the self-priming silt flushing pump is sucked into the gas-liquid co-storage liquid chamber at the lower part of the self-priming silt flushing pump chamber, the mixed suspended liquid medium in the pit is gradually sucked into the gas-liquid co-storage liquid chamber at the lower part of the self-priming silt flushing pump chamber. Since the density of the gas is much smaller than the density of the mixed suspended liquid, the upper part of the gas-liquid co-storage liquid chamber is gas, and the lower part is the mixed suspended liquid medium. At the same time, since the suction port of the impeller inlet short pipe in the chamber of the self-priming silt flushing pump is at the lower part of the gas-liquid co-storage liquid chamber, as the impeller continues to work, it will suck the mixed suspended liquid medium in the pit in the gas-liquid co-storage liquid chamber that was previously sucked into the gas-liquid co-storage liquid chamber, so that the air in the lower suction pipe of the self-priming silt flushing pump is always stored in the upper part of the gas-liquid co-storage liquid chamber to form gas-liquid coexistence;

[0012] The mixed suspended liquid discharged into the balanced irrigation and suction liquid storage chamber by S5 is partially filtered by the filter screen on the balanced flushing and silting flow pipe and then continues to flow into the flushing and silting chamber, while the other part flows into the suction port of the self-priming flushing and silting pump chamber through the balanced nozzle pipe on the balanced flushing and silting flow pipe and gradually flows back to the gas-liquid co-storage chamber;

[0013] S6 When the impeller is in continuous operation, the pressure of the filtered liquid flowing into the silt flushing chamber gradually increases, thereby continuously flushing the slurry deposited at the bottom of the pit through the silt flushing nozzle to a large extent, and expanding the range of mixed suspended silt flushing. When the mixed suspended liquid medium in the pit is flushed and sucked to the controlled low level, the automatic silt flushing centrifugal pump automatically stops working. At this time, under the action of the gravity of the liquid in the pit, the liquid in the pump outlet pipe, the self-priming silt flushing pump chamber and the self-priming silt flushing lower suction pipe flows back into the pit, that is, the liquid level difference reflux. At the same time, the gas in the upper part of the gas-liquid co-storage liquid chamber of the self-priming silt flushing pump chamber will also flow back to the self-priming silt flushing lower suction pipe.

[0014] S7 When all the liquid in the outlet pipe has been refluxed, external air will enter the outlet pipe. When the air in the outlet pipe flows back into the balanced irrigation and suction liquid storage chamber of the self-priming flushing and silt pump chamber through the discharge port of the self-priming flushing and silt pump chamber, the air will quickly flow back into the suction port pipe of the self-priming flushing and silt pump chamber through the balancing nozzle on the balancing flushing and silt flow pipe until it flows back into the self-priming flushing and silt lower suction pipe, thus forming balanced irrigation and suction;

[0015] S8 When the external air flows back to the self-priming flushing and silting lower suction pipe through the balancing flow nozzle on the balancing flushing and silting flow pipe, the liquid in the self-priming flushing and silting pump chamber forms a balanced pressure and stops siphoning. At this time, the liquid in the self-priming flushing and silting pump chamber is stored, and the gas in the self-priming flushing and silting lower suction pipe returns to the capacity before the pump is started, ensuring that there is enough liquid stored in the self-priming flushing and silting pump chamber when the pump is started next time. This is the principle of gas-liquid coexistence, balanced irrigation and suction, self-priming and its additional automatic mixing and suspension flushing function.

[0016] Preferably, the vertical self-priming centrifugal pump shaft seal uses a design concept of a built-in cartridge-type single-end-face non-flushing self-circulating cooling mechanical seal assembly, which is composed of a flange assembled on the basis of the design principle of the built-in cartridge-type single-end-face mechanical seal assembly.

[0017] Preferably, the upper end of the water injection and discharge tee is sealed by wrapping raw tape with an internal thread ball valve and then connected to the external water source pipe, and the outer horizontal port of the water injection and discharge tee is sealed by tightening with an internal thread hexagonal plug.

[0018] Preferably, a particle foreign matter interception filter is provided at the front end of the balanced flushing and silting flow pipe and is located in the balanced irrigation and suction liquid storage chamber.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention adds the function of automatic mixing, suspension and silt flushing to the principle of gas-liquid coexistence, balanced irrigation and self-priming, eliminating the need for various complex and cumbersome engineering machines used in mixing, suspension and silt flushing and suction and transporting various easily precipitated solid-liquid two-phase bodies or various complex and harsh mixed liquid media containing easily precipitated particles, thereby saving a lot of manpower and greatly shortening working time.

[0021] The present invention adopts a new design concept of a built-in containerized single-end face non-flushing self-circulating cooling mechanical seal assembly, which avoids the troublesome use of external flushing cooling water and the resource consumption problem, solves the accident problem of leakage at the shaft hole often occurring in self-priming centrifugal pumps without seals, and solves the technical problem of motor burning caused by mechanical seal damage often occurring in submersible sewage centrifugal pumps. It also stabilizes the performance of the mechanical seal assembly in the centrifugal pump for slurry media and extends the service life of the mechanical seal assembly.

[0022] 3. The present invention uses a short shaft to connect all the dynamic components of the centrifugal pump and the motor shaft, making the centrifugal pump virtually vibration-free during use. Therefore, no fixing is required during installation, eliminating many vulnerable parts such as bearing assemblies and mounting brackets commonly used in centrifugal pumps on the market, thereby improving the mechanical efficiency of the centrifugal pump and achieving energy-saving and consumption-reducing effects.

[0023] 4. The present invention has a small footprint, few vulnerable parts, is easy to inspect and maintain, and vulnerable working parts can be easily disassembled and inspected as a whole. The working vibration is minimized and the vertical liquid short shaft direct connection does not require a fixed design concept. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 It is a schematic structural diagram of the mechanical seal assembly of the present invention;

[0026] Figure 3It is a structural diagram of the self-priming silt flushing pump chamber of the present invention;

[0027] Figure 4 This is a schematic structural diagram of the self-priming sediment flushing and lowering suction pipe of the present invention;

[0028] Figure 5 It is a working schematic diagram of the present invention.

[0029] Figure: 1. Power motor; 2. Adjustable liquid retaining plate; 3. Pump shaft; 4. Pump cover; 5. Mechanical seal assembly; 6. Guard plate; 7. Impeller; 8. Impeller fastening bolts; 9. Pump body; 10. Self-priming silt flushing pump chamber; 11. Silt flushing flow transition joint hose; 12. Self-priming silt flushing lower suction pipe;

[0030] 501. Stationary ring seat; 502. Assembly flange; 503. Stationary ring; 504. Machine sleeve; 505. Rotating ring stop pin; 506. Rotating ring seat; 507. Compensating spring; 508. Rotating ring;

[0031] 1001. Balanced irrigation and suction liquid storage chamber; 1002. Gas-liquid combined liquid storage chamber; 1003. Discharge outlet; 1004. Balanced silt flushing and flow pipe; 1005. Impeller inlet short pipe; 1006. Suction port; 1007. Water injection and venting tee; 1008. Balanced flow nozzle pipe;

[0032] 1201. Outlet flow short section elbow; 1202. Liquid flow pipe; 1203. Flushing and silting chamber; 1204. Flushing and silting flow pipe; 1205. Filter screen. DETAILED DESCRIPTION

[0033] The invention is further described below with reference to the accompanying drawings and specific embodiments:

[0034] In the existing market, for various solid-liquid two-phase media containing easily precipitated particles or various harsh mixed liquid media containing easily precipitated particle slurries, the need for mixing, suspending, flushing and pumping and transporting requires complex and tedious financial, human and material resources, which brings a considerable workload to the work in this field. Therefore, it is necessary to design a centrifugal pump that can automatically mix, suspend, flush and pump and transport easily precipitated particle slurries.

[0035] like Figure 1 — Figure 5As shown, an automatic flushing and silting self-priming single-stage single-suction pit centrifugal pump is based on the principle of gas-liquid coexistence balanced irrigation and suction self-priming and its additional automatic mixing suspension flushing and silting function and the design concept of a built-in containerized single-end face non-flushing self-circulating cooling mechanical seal component for the shaft seal of a vertical self-priming centrifugal pump. It includes a power motor 1, which is a working power motor component specially designed to prevent axial force in a centrifugal pump. The two sides of the bottom of the power motor 1 are connected to the surface of the pump cover 4 through fastening bolts. The rotating shaft at the bottom of the power motor 1 passes through the adjustment liquid baffle plate 2 mounted on the surface of the pump cover 4 and is connected to the pump shaft 3. The adjustment liquid baffle plate 2 is clamped at the positioning and fixing position formed by the step stop between the rotating shaft of the power motor 1 and the pump shaft 3, and is used to adjust the assembly and matching height of each working component during machining. At the same time, it also plays a role in preventing the liquid medium from spraying into the motor bearing and blocking the leaking liquid jet when the mechanical seal component 5 is damaged and leaks during use, thereby protecting the motor bearing from damage caused by liquid leakage. The pump shaft 3 and the mechanical seal component 5 are sealed by an O-shaped rubber ring, and there are no other connecting parts in the middle, thereby saving production costs and the use of other component materials, and greatly reducing the possibility of transmission vibration of the centrifugal pump. The outer periphery of the pump shaft 3 is provided with a mechanical seal component 5 that conflicts with the pump cover 4, and the bottom is connected to the impeller 7 through the impeller fastening bolts 8. The surface of the impeller 7 is pressed with a guard plate 6, and the guard plate 6 is fixed in the stop groove by the pump cover 4 and the pump body 9. The pump shaft 3 extends along the middle of the pump cover 4, and the bottom of the pump cover 4 It is connected to the pump body 9, and the bottom of the pump body 9 is connected to the self-priming flushing and silt pump chamber 10. The self-priming flushing and silt pump chamber 10 includes a balanced irrigation and suction liquid storage chamber 1001 and a gas-liquid total storage liquid chamber 1002 arranged in sequence from top to bottom. A discharge port 1003 is provided on one side of the balanced irrigation and suction liquid storage chamber 1001, and a balanced flushing and silt flow pipe 1004 is provided on the other side. An impeller inlet short pipe 1005 inserted into the gas-liquid total storage liquid chamber 1002 is provided at the bottom. The balanced flushing and silt flow pipe 1004 plays a role in balancing the liquid surface pressure between the suction port 1006 and the discharge port 1003 of the self-priming flushing and silt pump chamber 10, preventing the liquid in the self-priming flushing and silt pump chamber 10 from being siphoned, thereby ensuring the stability of the self-priming performance of the self-priming pump, and on the other hand, plays a role in balancing the excessive flushing and silt flow. The joint hose 11 automatically transports the sucked mixed suspended liquid at the bottom of the pit to the silt flushing flow pipe of the self-priming silt flushing lower suction pipe 12 until it enters the silt flushing chamber. The discharge port 1003 is a channel connecting the balanced irrigation and suction liquid storage chamber 1001 with the peripheral pipeline of the pump outlet. The upper end of the gas-liquid total storage chamber 1002 is provided with a suction port 1006, and the lower end is provided with a water injection and emptying tee pipe 1007. The balanced silt flushing flow pipe 1004 is connected to the suction port 1006 through the balanced flow nozzle pipe 1008 on its surface. The balanced flow nozzle pipe 1008 minimizes the flow loss during balanced irrigation and suction flow. The balanced silt flushing flow pipe 1004 is fixed in the self-priming silt flushing lower suction pipe 12 through the silt flushing flow transition joint hose 11 set on its surface.One end of the self-priming silt flushing lower suction pipe 12 is connected to the suction port 1006, and a silt flushing chamber is provided at the lower part of the other end. Silt flushing nozzles are evenly distributed on the circular wall of the silt flushing chamber. The silt flushing nozzles flush the mud deposited at the bottom of the pit and form automatic mixed suspended silt flushing. The silt flushing flow transition joint hose 11 and the flange circular baffle on the balanced silt flushing flow pipe 1004 ensure that the silt flushing liquid can pass through the silt flushing flow transition joint hose 11 in a stable and closed state to mix and suspend the liquid at the bottom of the pit to be sucked. The mechanical seal assembly 5 includes a static component and a dynamic component. The static component includes a stationary ring seat 501. The surface of the stationary ring seat 501 is provided with an assembly pressure flange 502. The bottom is thermally mounted with a stationary ring 503. The assembly pressure flange 502 is a two-petal assembly form. The end of the assembly pressure flange 502 is inserted into the machine seal sleeve 504. The surface of the assembly pressure flange 502 is connected to the pump cover 4 through a fastening screw. The stationary ring 503 is thermally mounted on the stationary ring seat 501. 1 forms a static component with the static ring seat 501, and the dynamic component includes a machine seal 504 connected to the pump shaft 3 via a key bar. The outer periphery of the lower end of the machine seal 504 is connected to the dynamic ring seat 506 via a dynamic ring stop pin 505. One end of the dynamic ring stop pin 505 is inserted into the stop pin hole of the machine seal 504, and the other end is inserted into the stop pin groove of the dynamic ring seat 506, so that the machine seal 504 drives the dynamic ring seat 506 to rotate. A compensation spring is also provided between the machine seal 504 and the dynamic ring seat 506. Spring 507, one end of which is fixedly installed in the spring placement hole on the surface of the mechanical seal sleeve 504, and the other end contacts the back of the dynamic ring seat 506 to form a sealing compensation force, so that the dynamic and static rings of the mechanical seal assembly 5 can maintain a tight sealing fit in any state. The surface of the dynamic ring seat 506 is shrink-fitted with a dynamic ring 508, which is shrink-fitted on the dynamic ring seat 506 to form an integral dynamic component with the dynamic ring seat 506. The shrink-fit stop step naturally forms a shrink-fit tight sealing state.

[0036] In the present invention, the principle of gas-liquid coexistence balance irrigation and self-priming and its additional automatic mixing, suspension and silt flushing function includes the following steps:

[0037] Before starting the S1 centrifugal pump, first fill the self-priming pump chamber with liquid. At this time, there is a certain amount of air in the self-priming pump lower suction pipe between the liquid level in the self-priming pump chamber and the liquid level of the pit medium.

[0038] After the S2 self-priming silt flushing centrifugal pump is started, the impeller uses the stored liquid in the self-priming silt flushing pump chamber to suck. At this time, the impeller begins to discharge liquid into the balance suction and slurry storage chamber of the self-priming silt flushing pump chamber. The liquid flows into the silt flushing chamber of the self-priming silt flushing lower suction pipe through the balance silt flushing flow pipe and the silt flushing flow pipe of the self-priming silt flushing lower suction pipe;

[0039] As the working pressure of the S3 impeller increases, the liquid entering the silt flushing chamber is flushed toward the slurry deposited at the bottom of the pit through the silt flushing nozzles, and begins to form an automatic mixed suspended silt flushing. At the same time, the air in the self-priming silt flushing lower suction pipe becomes thinner, gradually approaching a vacuum, driving the mixed suspended liquid in the pit to rise to the upper part of the self-priming silt flushing lower suction pipe;

[0040] S4 When all the air in the lower suction pipe of the self-priming silt flushing pump is sucked into the gas-liquid co-storage liquid chamber at the lower part of the self-priming silt flushing pump chamber, the mixed suspended liquid medium in the pit is gradually sucked into the gas-liquid co-storage liquid chamber at the lower part of the self-priming silt flushing pump chamber. Since the density of the gas is much smaller than the density of the mixed suspended liquid, the upper part of the gas-liquid co-storage liquid chamber is gas, and the lower part is the mixed suspended liquid medium. At the same time, since the suction port of the impeller inlet short pipe in the chamber of the self-priming silt flushing pump is at the lower part of the gas-liquid co-storage liquid chamber, as the impeller continues to work, it will suck the mixed suspended liquid medium in the pit in the gas-liquid co-storage liquid chamber that was previously sucked into the gas-liquid co-storage liquid chamber, so that the air in the lower suction pipe of the self-priming silt flushing pump is always stored in the upper part of the gas-liquid co-storage liquid chamber to form gas-liquid coexistence;

[0041] The mixed suspended liquid discharged into the balanced irrigation and suction liquid storage chamber by S5 is partially filtered by the filter screen on the balanced flushing and silting flow pipe and then continues to flow into the flushing and silting chamber, while the other part flows into the suction port of the self-priming flushing and silting pump chamber through the balanced nozzle pipe on the balanced flushing and silting flow pipe and gradually flows back to the gas-liquid co-storage chamber;

[0042] S6 When the impeller is in continuous operation, the pressure of the filtered liquid flowing into the silt flushing chamber gradually increases, thereby continuously flushing the slurry deposited at the bottom of the pit through the silt flushing nozzle to a large extent, and expanding the range of mixed suspended silt flushing. When the mixed suspended liquid medium in the pit is flushed and sucked to the controlled low level, the automatic silt flushing centrifugal pump automatically stops working. At this time, under the action of the gravity of the liquid in the pit, the liquid in the pump outlet pipe, the self-priming silt flushing pump chamber and the self-priming silt flushing lower suction pipe flows back into the pit, that is, the liquid level difference reflux. At the same time, the gas in the upper part of the gas-liquid co-storage liquid chamber of the self-priming silt flushing pump chamber will also flow back to the self-priming silt flushing lower suction pipe.

[0043] S7 When all the liquid in the outlet pipe has been refluxed, external air will enter the outlet pipe. When the air in the outlet pipe flows back into the balanced irrigation and suction liquid storage chamber of the self-priming flushing and silt pump chamber through the discharge port of the self-priming flushing and silt pump chamber, the air will quickly flow back into the suction port pipe of the self-priming flushing and silt pump chamber through the balancing nozzle on the balancing flushing and silt flow pipe until it flows back into the self-priming flushing and silt lower suction pipe, thus forming balanced irrigation and suction;

[0044] S8 When the external air flows back to the self-priming flushing and silting lower suction pipe through the balancing flow nozzle on the balancing flushing and silting flow pipe, the liquid in the self-priming flushing and silting pump chamber forms a balanced pressure and stops siphoning. At this time, the liquid in the self-priming flushing and silting pump chamber is stored, and the gas in the self-priming flushing and silting lower suction pipe returns to the capacity before the pump is started, ensuring that there is enough liquid stored in the self-priming flushing and silting pump chamber when the pump is started next time. This is the principle of gas-liquid coexistence, balanced irrigation and suction, self-priming and its additional automatic mixing and suspension flushing function.

[0045] The present invention utilizes a vertical self-priming centrifugal pump shaft seal with a built-in cartridge-type single-end non-flushing, self-circulating cooling mechanical seal assembly, constructed using the design principle of a built-in cartridge-type single-end non-flushing, self-circulating cooling mechanical seal assembly. This innovative design not only addresses the technical drawbacks of submersible centrifugal pumps, vacuum self-priming centrifugal pumps, and horizontal single-stage single-suction self-priming centrifugal pumps, which are prone to damage and unsuitable for various solid-liquid two-phase media and various harsh mixed liquid media, but also improves the mechanical seal assembly's stability in complex and harsh media conditions and extends its service life.This component is a dynamic and static integrated disassembly and assembly to prevent medium leakage in this pump design, and the production cost and price are also relatively expensive. In order to achieve the purpose of at least three years of use without damage and without replacement, the most vulnerable dynamic and static friction pairs are generally made of super wear-resistant materials such as pressureless sintered nano silicon carbide ceramics or nano nickel-chromium-molybdenum based tungsten carbide alloys; other metal parts such as machine seal 504, dynamic ring seat 506, static ring seat 501 and other parts that are in contact with the medium and are partially eroded by the medium are generally made of 304 stainless steel, 316L stainless steel, 904L stainless steel, 2205 duplex steel, C 276 corrosion-resistant alloy and other highly wear-resistant materials; compensation spring 507 and assembly pressure flange 502 are the least damaged parts in this assembly and do not contact the medium, and are generally made of 304 stainless steel; other auxiliary sealing O-type rubber ring standard parts, in order to ensure that such parts are not easily damaged by aging and corrosion before the mechanical seal is damaged, generally use durable fluororubber or silicone fluororubber materials; other fastening standard parts are generally made of 304 stainless steel, 316L stainless steel, 904L stainless steel or 2205 duplex steel materials, and the guard plate 6 is designed with a gap with the impeller 7 rear cover plate and the balance on the impeller 7 rear cover plate. The flow holes play the role of balancing the axial force of the impeller and stabilizing the liquid pressure in the space between the impeller 7 and the pump body 9. It is a static component that is not easy to wear but susceptible to medium erosion and corrosion. Generally, high wear-resistant materials such as ZGCr29 high chromium wear-resistant white cast steel and ZGCr29N high chromium wear-resistant alloy are used; the impeller 7 is the only dynamic working component of the centrifugal suction and conveying medium that converts the mechanical energy output by the motor shaft into the potential energy of the liquid medium. This component is a particularly important dynamic working component in the pump design that is easy to wear and susceptible to medium erosion and corrosion. Generally, ZGCr29 is used. High chromium wear-resistant white cast steel, ZGCr29N high chromium wear-resistant alloy and other super wear-resistant materials are used; the pump body 9 is an important static and easily damaged working part that can be replaced independently and is used to seal the inlet and outlet pressure difference when the impeller 7 sucks the medium and to press out the medium when conveying the medium. Its separate design can avoid abnormal wear of the multi-functional self-priming pump chamber and reduce maintenance costs. This component is an important static component that is easy to wear and susceptible to medium erosion and corrosion in pump design. Generally, ZGCr29 high chromium wear-resistant white cast steel, ZGCr29N high chromium wear-resistant alloy and other super wear-resistant materials are used. By setting a balanced flow nozzle pipe 1008, the pressure between the liquid level in the self-priming silt flushing pump chamber 10 and the liquid level in the pit is balanced, thereby preventing the liquid in the self-priming silt flushing pump chamber 10 from being siphoned, and at the same time ensuring the stability of the self-priming performance of the self-priming pump and reducing the flow loss to a minimum; the upper end of the water injection and discharge tee pipe 1007 is connected to the external water source pipe after being sealed by wrapping the raw tape with an internal thread ball valve, and the outer horizontal port of the water injection and discharge tee pipe 1007 is tightened and sealed with an internal thread hexagonal plug.

[0046] In the present invention, the upper end of the water injection and discharge tee 1007 is sealed with raw tape through an internal thread ball valve and then connected to the external water source pipe. The outer horizontal port of the water injection and discharge tee 1007 is tightly sealed with an internal thread hexagonal plug. During fault inspection and maintenance, opening the plug serves to drain the liquid medium in the chamber of the self-priming silt flushing pump.

[0047] In the present invention, the front end of the balanced flushing and silting flow pipe 1004 is provided with a particle foreign matter interception filter in the balanced irrigation and suction liquid storage chamber 1001. By providing the particle foreign matter interception filter, the balanced flow nozzle pipe 1008 and the flushing and silting nozzle are ensured not to be blocked.

[0048] In the present invention, the self-priming silt flushing lower suction pipe 12 includes an outlet flow short section elbow 1201, a liquid flow pipe 1202 and a silt flushing chamber 1203 connected in sequence, a silt flushing flow pipe 1204 is inserted into the outlet flow short section elbow 1201 along the extension direction, and a filter net 1205 is provided at the end of the liquid flow pipe 1202 and the surface of the silt flushing chamber 1203. The silt flushing and drainage pipe 1204 is airtightly welded to the inside of the flow short section elbow 1201, the liquid flow pipe 1202 and the filter screen 1205. A hose joint and a flange-type circular baffle are welded on the upper part, which are directly fitted, pressed and sealed with the silt flushing and drainage transition joint hose 11. The lower part is connected to the silt flushing chamber 1203. The filter screen 1205 is at the lower part of the self-priming silt flushing lower suction pipe 12 and welded to the upper part of the silt flushing chamber 1203. The filter mesh holes on the surface of the filter screen 1205 are sufficient to allow the liquid medium in the pit to flow through and to intercept extra-large particles of foreign matter. The silt flushing chamber 1203 is at the lowest part of the self-priming silt flushing lower suction pipe 12, and is also the functional part closest to the bottom of the pit. The filtered pressurized liquid is automatically input through the silt flushing and drainage pipe 1204, and then the slurry deposited at the bottom of the pit is flushed through the silt flushing nozzles welded around the periphery to automatically form a mixed suspended silt flushing. This component is the only closed channel for the liquid medium at the bottom of the pit to reach the suction port of the self-priming centrifugal pump chamber 10 under the action of the automatic silt flushing and suction operation of the self-priming centrifugal pump. It also plays the role of automatically mixing and suspending the slurry with easily precipitated particles in the silt flushing pit. Since it is easily eroded by the flow of the medium, highly wear-resistant materials such as 304 stainless steel and 316L stainless steel are selected.

[0049] In the present invention, the assembly flange 502 is a two-petal assembly form. In the final link of the overall assembly of the mechanical seal assembly, the static ring seat is pressed by hand to make the two petals of the assembly flange accurately fit into the compression positioning groove of the machine sleeve, and the four bolt holes are aligned with the four screw holes on the static ring seat. It is fixedly connected to the static ring seat with standard fastening screws, so that the mechanical seal assembly forms a combined component that can be disassembled as a whole. The two-petal assembly flange replaces the locking clamp or locking insert of the conventional built-in container-type single-end face mechanical seal assembly. After the mechanical seal assembly is installed as a whole, the overall disassembly and assembly effect can be achieved without adjusting any components.

[0050] In the present invention, the balancing flow holes on the pump cover 4 and the impeller 7 circulate the liquid medium in the balanced irrigation and suction storage chamber. Under the centrifugal action of the rotating ring seat driven by the pump shaft, the dynamic and static ring sealing end faces of the mechanical seal assembly not only achieve the purpose of automatic circulation flushing and cooling, but also achieve the effect of preventing fine particles in the medium from precipitating and scaling at the dynamic and static rings, ensuring that the mechanical seal assembly can be applied to various solid-liquid two-phase media and various complex and harsh mixed liquid media. This mechanical seal assembly not only solves the problem of easy leakage at the shaft hole of the sealless self-priming centrifugal pump, but also solves the technical design defects of the shaft seals of submersible centrifugal pumps, vacuum suction self-priming centrifugal pumps, and horizontal single-stage single-suction self-priming centrifugal pumps that are easy to be damaged and cannot be applied to various solid-liquid two-phase media and various complex and harsh mixed liquid media, but also improves the stability of the mechanical seal assembly when used in complex and harsh media working conditions, and extends the service life of the mechanical seal.

[0051] The present invention is based on the principle of adding an automatic mixing, suspension, and silt flushing function to the principle of gas-liquid coexistence, balanced irrigation, and self-priming, and the design concept of a built-in containerized single-end face non-flushing, self-circulating cooling mechanical seal component for the shaft seal of a vertical self-priming centrifugal pump. It is suitable for pits, ditches or rivers with a depth of no more than 6 meters, and is an automatic silt flushing, suspension, and silt flushing self-priming centrifugal pump that requires automatic mixing, suspension, and silt flushing and suction and transportation for various easily precipitated solid-liquid two-phase media or various complex and harsh easily precipitated granular mud mixed liquid media. According to the technical ideas of these inventions, the structural design follows the design ideas of small space occupation, few vulnerable parts, easy inspection and maintenance, easy disassembly and assembly of vulnerable working parts, and simple installation without fixing, which minimizes working vibration. It ensures that the invention, design and use of the new automatic flushing self-priming centrifugal pump product are small and exquisite, simple to install, easy to maintain, reasonable structure, stable performance, low failure rate, very low maintenance cost, long service life and more worry-free. After simple installation and connection of power supply and control and water source of water inlet valve and inspection (this pump is in normal operation and During the control process, a pit level control system must be installed in the pit to effectively control the pumping and delivery of the pit liquid level. The pump will automatically start when the maximum liquid level is ≥200mm below the upper base of the pit, and the pump will automatically stop when the minimum liquid level is ≥200mm above the self-priming flushing downpipe filter hole. The self-priming flushing downpipe must be inserted to the lowest point of the pit bottom surface, and the minimum distance between the bottom of the self-priming flushing downpipe filter and the pit bottom surface must be ≥50mm. All inlet and outlet pipes must be sealed and leak-proof. This will start the automatic flushing self-priming pit centrifugal pump. The specific working process is described as follows:

[0052] Step 1: Open the water injection ball valve to fill the peripheral process water into the pump chamber by self-priming;

[0053] Step 2: Turn on the power and start the motor to check the direction of the motor. When the pump is designed to work, it is correct if it rotates clockwise when viewed from the motor end. If it rotates in the opposite direction, it is wrong and the steering wiring needs to be readjusted.

[0054] The third step: restart the motor after the steering is correct. When the automatic self-priming centrifugal pump is started, the impeller uses the stored liquid in the self-priming pump chamber to produce suction work. At this time, the impeller begins to discharge liquid into the balanced irrigation storage chamber of the self-priming pump chamber. The discharged liquid part will automatically flow into the self-priming lower suction pipe of the self-priming pump chamber through the balanced suction pipe and the suction pipe of the self-priming lower suction pipe. Under the action of the increasing working pressure of the impeller, the liquid entering the suction chamber is washed to the mud precipitated at the bottom of the pit through each suction nozzle and begins to form a mixed suspended liquid. At the same time, the air in the self-priming lower suction pipe is sucked into the gas-liquid total storage chamber through the suction port of the self-priming pump chamber. Under the action of different gas-liquid specific gravities, the air in the self-priming lower suction pipe will normally stay in the upper part of the gas-liquid total storage chamber. When air is continuously sucked into the gas-liquid co-storage chamber, the air will become rarefied and continuously cause self-priming to rush into the lower suction pipe to produce a near vacuum. At this time, the mixed and suspended liquid medium in the pit will be continuously sucked into the gas-liquid co-storage chamber through the filter holes at the bottom of the lower suction pipe, the liquid flow pipe channel and the pump suction inlet channel under the vacuum state of self-priming rushing into the lower suction pipe, and sink to the bottom to form gas-liquid co-existence. When the impeller is working continuously, the mixed suspended liquid in the pit will be sucked into the impeller inlet. Under the action of the centrifugal force of the impeller, the mechanical energy of the motor will be continuously converted into the potential energy of the mixed suspended liquid medium to perform energy conversion and work. At this time, the impeller will squeeze the mixed suspended liquid medium sucked up from the pit through the pump body and discharge it into the balanced suction and liquid storage chamber of the self-priming pump chamber. At this time, most of the liquid medium will be transported to the outlet pipe connected to the pump by the impeller through the balanced suction and liquid storage chamber and the discharge port. Some of the mixed suspended liquid will continue to flow into the chamber after being filtered by the filter screen on the balanced flow pipe, and a small amount of liquid will return to the pump suction inlet through the balanced nozzle on the balanced flow pipe of the self-priming pump chamber until the gas-liquid storage chamber is stored, resulting in some flow loss. When the impeller is working continuously, the pressure of the filtered liquid flowing into the flushing chamber will gradually increase, which will continuously flush the mud settled at the bottom of the pit through the flushing nozzles over a large area and expand the mixing and suspension range. As long as the impeller is working normally, the flushing liquid in the flushing chamber will pass through a circle of nozzles to form an automatic mixing and suspension flushing function.

[0055] Step 4: When the pump outlet discharges the mixed suspended liquid medium normally, a certain pressure is generated in the balanced suction storage chamber of the pump chamber by self-priming. Under the combined action of the liquid pressure and the compensation spring, the dynamic and static rings of the mechanical seal assembly will be tightly closed to form an axial seal. Under the action of the liquid medium pressure, a very small amount of liquid film will be formed on the sealing end faces of the dynamic and static rings to protect the dynamic and static rings from friction damage. After checking whether there is leakage or abnormal sound at the shaft hole, it can be determined whether the mechanical seal assembly is failed or damaged. If there is no leakage or abnormal sound, it means that the sealing effect of the mechanical seal assembly is good.

[0056] Step 5: When the liquid flow discharged from the pump outlet to the peripheral outlet pipe is normal, close the valve channel on the outlet pipe to the pressure value we designed (determined by the outlet pressure gauge reading), and then check the flow meter data on the outlet pipeline. When the flow and pressure reach our designed parameter values, check whether the motor's rated working current is exceeded based on the reading on the motor's current measuring meter. If all data are normal, calculate whether the pump's working efficiency reaches all the designed working parameter values. If all data parameters are within our design range, the first working test of this automatic self-priming single-stage single-suction pit centrifugal pump is a complete success.

[0057] Step 6: After the test run is successful, cut off the power supply of the motor and keep the pump in the stopped state. At this time, the liquid medium retained in the outlet pipeline of the pump periphery will flow back into the self-priming pump chamber under the condition of liquid level difference with the pit until it flows back into the pit (this situation is called liquid level difference reflux phenomenon). At this time, the air that stayed in the upper part of the gas-liquid storage chamber of the self-priming pump chamber when the pump was started will also flow back into the self-priming lower suction pipe. When the liquid in the outlet pipeline flows back to the self-priming pump chamber, the outlet pipeline will have outside air to supplement and enter the outlet pipeline. When all the liquid medium retained in the outlet pipeline flows back to the self-priming pump chamber, the outside air also enters the self-priming pump chamber. When the air enters the balanced irrigation and suction liquid storage chamber of the self-priming pump chamber, the air in the balanced irrigation and suction liquid storage chamber will quickly pass through The balance nozzle on the balanced flow pipe is sucked into the pump suction port until it enters the self-priming downsuction pipe. In this way, the external pressure on the liquid in the self-priming pump chamber will be balanced with the liquid pressure in the pit below the self-priming downsuction pipe. At this time, the liquid in the self-priming pump chamber will stop flowing back, ensuring sufficient liquid storage for the next pump start-up (if we close the outlet pipe valve in time when the pump is stopped, the liquid in the self-priming pump chamber will also stop flowing back. At this time, the air originally staying in the upper part of the gas-liquid co-storage liquid chamber will flow back to the self-priming downsuction pipe to block the siphon reflux). This is called adding automatic mixing and suspension flushing function on the basis of the self-priming principle of gas-liquid coexistence and balanced irrigation. The complete working process of the automatic flushing self-priming single-stage single-suction pit centrifugal pump invented in this way is successfully completed.

[0058] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. All equivalent changes and modifications in the shape, structure, characteristics and spirit of the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An automatic silt flushing, self-priming, single-stage, single-suction pit centrifugal pump, characterized by: Based on the principle of gas-liquid coexistence, balanced irrigation and self-priming and its additional automatic mixing, suspension and silt flushing function and the design concept of a built-in containerized single-end face non-flushing, self-circulating cooling mechanical seal assembly for the shaft seal of a vertical self-priming centrifugal pump, the power motor is connected to the surface of the pump cover on both sides of the bottom through fastening bolts, the rotating shaft at the bottom of the power motor is connected to the pump shaft after passing through the adjustment liquid baffle mounted on the surface of the pump cover, the outer periphery of the pump shaft is provided with a mechanical seal assembly that conflicts with the pump cover, and the bottom is connected to the impeller through the impeller fastening bolts. A guard plate is pressed onto the surface of the impeller, and the guard plate is fixed in the stop groove by the pump cover and the pump body. The pump shaft extends along the middle of the pump cover, and the bottom of the pump cover is connected to the pump body. The bottom of the pump body is connected to the self-priming flushing and silting pump chamber. The self-priming flushing and silting pump chamber includes a balanced irrigation and suction liquid storage chamber and a gas-liquid common storage liquid chamber arranged in sequence from top to bottom. One side of the balanced irrigation and suction liquid storage chamber is provided with a discharge port, and the other side is provided with a balanced flushing and silting flow pipe. The bottom is provided with an impeller inlet short pipe inserted into the gas-liquid common storage liquid chamber. The gas-liquid common storage liquid chamber has an upper side. The upper end is provided with a suction port, and the lower end is provided with a water injection and emptying tee pipe. The balanced silt flushing flow pipe is connected to the suction port through the balanced flow nozzle pipe on its surface. The balanced silt flushing flow pipe is fixed in the self-priming silt flushing lower suction pipe through the silt flushing flow transition joint hose sleeved on its surface. One end of the self-priming silt flushing lower suction pipe is connected to the suction port, and a silt flushing chamber is provided at the lower part of the other end. The silt flushing chamber has silt flushing nozzles evenly distributed on the outer circular wall. The balanced silt flushing flow pipe balances the liquid surface pressure between the suction port and the discharge port of the self-priming silt flushing pump chamber on the one hand, to prevent self-priming. The liquid in the silt flushing pump chamber is siphoned to ensure the stability of the self-priming performance of the self-priming pump. On the other hand, it plays the role of automatically transporting the mixed suspended liquid at the bottom of the pit to the silt flushing flow pipe of the self-priming silt flushing lower suction pipe through the silt flushing flow transition joint hose until it reaches the silt flushing chamber. The self-priming silt flushing lower suction pipe includes an outlet flow short section elbow, a liquid flow pipe and a silt flushing chamber connected in sequence. A silt flushing flow pipe is inserted into the outlet flow short section elbow along the extension direction, and a filter is provided at the end of the liquid flow pipe and the surface of the silt flushing chamber. The cam is pressed against the pump cover to release the piston, and the piston rod is pressed against the piston rod to release the piston rod, so that the piston rod can be kept in a state of sealing and can be used for pumping.

2. The automatic silt flushing, self-priming, single-stage, single-suction pit centrifugal pump according to claim 1, characterized in that: The principle of gas-liquid coexistence balanced irrigation and self-priming and its additional automatic mixing, suspension and silt flushing function includes the following steps: Before starting the S1 centrifugal pump, first fill the self-priming pump chamber with liquid. At this time, there is a certain amount of air in the self-priming pump lower suction pipe between the liquid level in the self-priming pump chamber and the liquid level of the pit medium. After the S2 self-priming silt flushing centrifugal pump is started, the impeller uses the stored liquid in the self-priming silt flushing pump chamber to suck. At this time, the impeller begins to discharge liquid into the balance suction and slurry storage chamber of the self-priming silt flushing pump chamber. The liquid flows into the silt flushing chamber of the self-priming silt flushing lower suction pipe through the balance silt flushing flow pipe and the silt flushing flow pipe of the self-priming silt flushing lower suction pipe; As the working pressure of the S3 impeller increases, the liquid entering the silt flushing chamber is flushed toward the slurry deposited at the bottom of the pit through the silt flushing nozzles, and begins to form an automatic mixed suspended silt flushing. At the same time, the air in the self-priming silt flushing lower suction pipe becomes thinner, gradually approaching a vacuum, driving the mixed suspended liquid in the pit to rise to the upper part of the self-priming silt flushing lower suction pipe; S4 When all the air in the lower suction pipe of the self-priming silt flushing pump is sucked into the gas-liquid co-storage liquid chamber at the lower part of the self-priming silt flushing pump chamber, the mixed suspended liquid medium in the pit is gradually sucked into the gas-liquid co-storage liquid chamber at the lower part of the self-priming silt flushing pump chamber. Since the density of the gas is much smaller than the density of the mixed suspended liquid, the upper part of the gas-liquid co-storage liquid chamber is gas, and the lower part is the mixed suspended liquid medium. At the same time, since the suction port of the impeller inlet short pipe in the chamber of the self-priming silt flushing pump is at the lower part of the gas-liquid co-storage liquid chamber, as the impeller continues to work, it will suck the mixed suspended liquid medium in the pit in the gas-liquid co-storage liquid chamber that was previously sucked into the gas-liquid co-storage liquid chamber, so that the air in the lower suction pipe of the self-priming silt flushing pump is always stored in the upper part of the gas-liquid co-storage liquid chamber to form gas-liquid coexistence; The mixed suspended liquid discharged into the balanced irrigation and suction storage chamber by S5 is partially filtered by the filter screen on the balanced flushing and silting flow pipe and then continues to flow into the flushing and silting chamber, while the other part flows into the suction port of the self-priming flushing and silting pump chamber through the balanced flow nozzle pipe on the balanced flushing and silting flow pipe and gradually flows back to the gas-liquid co-storage chamber; S6 When the impeller is in continuous operation, the pressure of the filtered liquid flowing into the silt flushing chamber gradually increases, thereby continuously flushing the slurry deposited at the bottom of the pit through the silt flushing nozzle to a large extent, and expanding the range of mixed suspended silt flushing. When the mixed suspended liquid medium in the pit is flushed and sucked to the controlled low level, the automatic silt flushing centrifugal pump automatically stops working. At this time, under the action of the gravity of the liquid in the pit, the liquid in the pump outlet pipe, the self-priming silt flushing pump chamber and the self-priming silt flushing lower suction pipe flows back into the pit, that is, the liquid level difference reflux. At the same time, the gas in the upper part of the gas-liquid co-storage liquid chamber of the self-priming silt flushing pump chamber will also flow back to the self-priming silt flushing lower suction pipe. S7 When all the liquid in the outlet pipe has been refluxed, external air will enter the outlet pipe. When the air in the outlet pipe flows back into the balanced irrigation and suction liquid storage chamber of the self-priming flushing and silt pump chamber through the discharge port of the self-priming flushing and silt pump chamber, the air will quickly flow back into the suction port pipe of the self-priming flushing and silt pump chamber through the balanced flow nozzle pipe on the balanced flushing and silt flow pipe until it flows back into the self-priming flushing and silt lower suction pipe, thus forming balanced irrigation and suction; S8 When the external air flows back to the self-priming flushing and silting lower suction pipe through the balanced flow nozzle pipe on the balanced flushing and silting flow pipe, the liquid in the self-priming flushing and silting pump chamber forms a balanced pressure and stops siphoning. At this time, the liquid in the self-priming flushing and silting pump chamber is stored, and the gas in the self-priming flushing and silting lower suction pipe returns to the capacity before the pump is started, ensuring that there is enough liquid stored in the self-priming flushing and silting pump chamber when the pump is started next time. This is the principle of gas-liquid coexistence balanced irrigation and self-priming and its additional automatic mixing and suspension flushing function.

3. The automatic silt flushing, self-priming, single-stage, single-suction pit centrifugal pump according to claim 1, characterized in that: The design concept of the vertical self-priming centrifugal pump shaft seal using a built-in cartridge single-end face non-flushing self-circulating cooling mechanical seal component is composed of a flange assembled on the basis of the design principle of the built-in cartridge single-end face mechanical seal component.

4. The automatic silt flushing, self-priming, single-stage, single-suction pit centrifugal pump according to claim 1, characterized in that: The upper end of the water injection and drain tee is sealed by wrapping raw tape with an internal thread ball valve and then connected to the external water source pipe. The outer horizontal port of the water injection and drain tee is sealed by tightening with an internal thread hexagonal plug.

5. The automatic silt flushing, self-priming, single-stage, single-suction pit centrifugal pump according to claim 1, characterized in that: A particle foreign matter interception filter screen is provided at the front end of the balanced flushing and silting flow pipe and is located in the balanced irrigation and suction liquid storage chamber.

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