Submersible electric pump with sand prevention and winding prevention functions

Abstract

The utility model discloses a submersible electric pump with sand prevention and winding prevention functions. The submersible electric pump comprises a submersible motor, a mechanical sealing seat, a collector, an impeller, a volute and a bottom cover, the upper end of the volute is connected with the lower end of the submersible motor; the upper end of the bottom cover is connected with the lower end of the volute; the mechanical sealing seat penetrates through a rotor shaft of the submersible motor, is arranged at the lower end of the submersible motor and is positioned between the submersible motor and the volute; the collector is arranged at the lower end of the mechanical sealing seat; the impeller is arranged at the end of the rotor shaft and located in the volute, and the mechanical seal penetrates through the rotor shaft to be arranged on the mechanical seal seat and located in a cavity between the impeller and the mechanical seal seat. And the impeller is in clearance fit with the mechanical sealing seat. According to the structure, fine sand and fibers can be effectively prevented from entering the cavity where the mechanical seal is located, so that the sand and the fibers are prevented from influencing the sealing performance of the mechanical seal, safe use of the mechanical seal is guaranteed, and then the safety and the stability of operation of the electric pump are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of submersible electric pumps, in particular to a submersible electric pump with sand prevention and winding prevention functions. Background Art

[0002] Submersible electric pumps are widely used in the transportation of municipal sewage and wastewater. Due to the complex composition of domestic sewage and industrial wastewater, which contains a large amount of sand and fiber, during the operation of the submersible electric pump, fine sand and fiber will enter the cavity where the mechanical seal is located. The sand will affect the seal of the seal pair, and the fiber will be entangled on the mechanical seal, which will affect the safe use of the mechanical seal, thereby allowing liquid to enter the motor cavity and cause damage to the motor. Therefore, a sand-proof and entanglement-proof electric pump is needed to prevent debris from entering the cavity and avoid damage to the motor. Summary of the invention

[0003] Technical problem: The technical problem to be solved by the utility model is: to provide a submersible electric pump with sand prevention and anti-winding functions, which can effectively prevent fine sand particles and fibers from entering the cavity where the mechanical seal is located, thereby avoiding sand particles and fibers from affecting the sealing performance of the mechanical seal, ensuring the safe use of the mechanical seal, and further ensuring the safety and stability of the electric pump operation.

[0004] Technical solution: To solve the above technical problems, the technical solution adopted by the embodiment of the utility model is:

[0005] A submersible electric pump with anti-sand and anti-winding functions comprises a submersible motor, a mechanical seal seat, a collector, an impeller, a volute and a bottom cover; the upper end of the volute is connected to the lower end of the submersible motor; the upper end of the bottom cover is connected to the lower end of the volute; the mechanical seal seat passes through the rotor shaft of the submersible motor and is arranged at the lower end of the submersible motor, and is located between the submersible motor and the volute; the collector is arranged at the lower end of the mechanical seal seat; the impeller is arranged at the end of the rotor shaft and is located in the volute, the mechanical seal passes through the rotor shaft and is arranged on the mechanical seal seat, and is located in the cavity between the impeller and the mechanical seal seat; the impeller and the mechanical seal seat are clearance-matched.

[0006] As a preferred example, the impeller includes blades, a sealing ring, a cover plate, a hub, a collecting groove and a spiral; the blades are located at the lower end of the cover plate; the sealing ring is located at the upper end of the cover plate; the cover plate and the hub are connected; a collecting groove is formed between the sealing ring and the hub; and the spiral is arranged on the outer circumference of the sealing ring.

[0007] As a preferred example, the collecting groove is an annular groove and is located on the upper end surface of the cover plate.

[0008] As a preferred example, the outer diameter of the sealing ring is equal to the outer diameter of the cover plate; the length of the spiral body is equal to the length of the sealing ring.

[0009] As a preferred example, the mechanical seal seat includes a body, a mounting groove, a sealing groove and a cutting body; the mounting groove is located at the inner lower end of the body; the sealing groove is located at the lower end of the mounting groove; and the cutting body is arranged on the inner circumference of the sealing groove.

[0010] As a preferred example, the upper end surface of the sealing ring and the upper end surface of the sealing groove form a sealing pair; the sealing pair is horizontally arranged; a cutting pair is formed between the spiral body and the cutting body; and the cutting pair is vertically arranged.

[0011] As a preferred example, the collector includes a connecting plate, a needle brush and a cylinder; the cylinder is connected to the connecting plate; and the needle brush is arranged on the inner and outer circumferences of the cylinder.

[0012] As a preferred example, the collector is coaxially arranged with the impeller; the collector is arranged at the end of the mounting groove; and the bottom end of the cylinder is located in the sealing groove.

[0013] Beneficial effects: Compared with the prior art, the technical solution of the utility model has the following beneficial effects: The technical solution of the utility model prevents external particles from entering the cavity where the mechanical seal is located by setting a labyrinth seal formed by a cutting pair and a sealing pair. If a small amount of particles enter the interior, they will settle in the collection tank. At the same time, the cutting pair cuts the fiber debris in the water and takes the fiber debris to the outside. A small amount of fiber debris that enters the cavity where the mechanical seal is located will be collected by the collector, ensuring that no particles and fiber debris appear in the cavity, improving the operating environment of the mechanical seal, allowing the mechanical seal to be used safely, and thus ensuring that the electric pump can operate safely and stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of an embodiment of the utility model;

[0015] Figure 2 This is a structural diagram of an impeller in an embodiment of the utility model;

[0016] Figure 3 This is a structural diagram of a mechanical seal seat according to an embodiment of the utility model;

[0017] Figure 4 It is a structural diagram of a collector according to an embodiment of the utility model.

[0018] The figure includes: submersible motor 1, mechanical seal seat 2, collector 3, impeller 4, volute 5, bottom cover 6, cutting pair 7, sealing pair 8, main body 21, mounting groove 22, sealing groove 23, cutting body 24, connecting plate 31, needle brush 32, cylinder 33, blade 41, sealing ring 42, cover plate 43, hub 44, collecting groove 45, and spiral body 46. DETAILED DESCRIPTION

[0019] The technical solution of the utility model is described in detail below in conjunction with the accompanying drawings.

[0020] like Figure 1 As shown, a submersible electric pump with anti-sand and anti-winding functions according to an embodiment of the utility model comprises a submersible motor 1, a mechanical seal seat 2, a collector 3, an impeller 4, a volute 5 and a bottom cover 6; the upper end of the volute 5 is connected to the lower end of the submersible motor 1; the upper end of the bottom cover 6 is connected to the lower end of the volute 5; the mechanical seal seat 2 passes through the rotor shaft of the submersible motor 1 and is arranged at the lower end of the submersible motor 1, and is located between the submersible motor 1 and the volute 5; the collector 3 is arranged at the lower end of the mechanical seal seat 2; the impeller 4 is arranged at the end of the rotor shaft and is located in the volute 5, the mechanical seal passes through the rotor shaft and is arranged on the mechanical seal seat 2, and is located in the cavity between the impeller 4 and the mechanical seal seat 2; the impeller 4 is clearance-matched with the mechanical seal seat 2.

[0021] In a submersible electric pump with the above-mentioned structure and the function of preventing sand and winding, the cutting pair 7 and the sealing pair 8 are arranged to cooperate to form a labyrinth seal, which can effectively prevent the external debris of the cavity from entering the cavity; the cutting pair 7 produces a fluid from top to bottom, which can effectively prevent the particles from entering the cavity, and at the same time, the cutting pair 7 can cut the fiber debris entering the cutting pair 7 into smaller segments, which flow to the outside of the cavity with the fluid. When a small amount of particles enters the cavity, it will fall onto the collecting trough 45, will not be scattered in the cavity, and will not affect the mechanical seal; when a small amount of fiber debris enters the cavity, it will be intercepted by the collector 3 and entangled on the collector 3, thus preventing the fiber debris from being entangled on the mechanical seal. Thereby, the working environment of the mechanical seal is improved, so that the mechanical seal can work in a safe environment, thereby ensuring the safety and stability of the operation of the electric pump.

[0022] When the electric pump is running, sewage enters the volute 5 through the bottom of the bottom cover 6, and the high-speed rotating impeller 4 does work on the liquid. The high-speed rotating impeller 4 and the static mechanical seal seat 2 form a labyrinth seal of the cutting pair 7 and the sealing pair 8 that are continuously formed from the outside to the inside. The labyrinth seal has sealing and cutting functions, preventing sand and fine fibers outside the cavity from entering the cavity. At the same time, the cutting pair 7 cuts the fiber debris, and the cut fiber debris is carried to the outside of the cavity by the water flow. At the same time, the collecting tank 45 and the collector 3 will respectively collect and intercept the sand and fiber debris that enter the cavity, thereby ensuring that the mechanical seal operates in a safe environment, thereby improving the safety and stability of the electric pump operation.

[0023] like Figure 2As shown, as a preferred example, the impeller 4 includes blades 41, a sealing ring 42, a cover plate 43, a hub 44, a collecting groove 45 and a spiral 46; the blades 41 are located at the lower end of the cover plate 43; the sealing ring 42 is located at the upper end of the cover plate 43; the cover plate 43 and the hub 44 are connected; a collecting groove 45 is formed between the sealing ring 42 and the hub 44; the spiral 46 is arranged on the outer circumference of the sealing ring 42. When the electric pump is running, the impeller 4 rotates at high speed, and the spiral 46 rotates with the impeller 4. The spiral 46 cooperates with the cutting body 24 to form a cutting pair 7. The cutting pair 7 prevents particulate matter and debris from entering the cavity, and at the same time cuts fiber debris, so that the debris is blocked outside the cavity, thereby improving the environment inside the cavity where the mechanical seal is located and ensuring the safe operation of the mechanical seal.

[0024] As a preferred example, the collecting groove 45 is an annular groove and is located on the upper end surface of the cover plate 43. The function of the collecting groove 45 is: when a small amount of particles enter the cavity, due to the effect of gravity, the particles will fall downward and settle on the collecting groove 45, so that the particles will not be scattered inside the cavity, avoiding interference and damage to the mechanical seal.

[0025] As a preferred example, the outer diameter of the sealing ring 42 is equal to the outer diameter of the cover plate 43; the length of the spiral body 46 is equal to the length of the sealing ring 42. The length of the spiral body 46 is equal to the length of the sealing ring 42, so that a longer cutting pair 7 can be formed, thereby having a better effect of blocking sand particles and cutting fiber debris.

[0026] like Figure 3 As shown, as a preferred example, the mechanical seal seat 2 includes a body 21, a mounting groove 22, a sealing groove 23 and a cutting body 24; the mounting groove 22 is located at the inner lower end of the body 21; the sealing groove 23 is located at the lower end of the mounting groove 22; and the cutting body 24 is arranged on the inner circumference of the sealing groove 23. The cutting body 24 and the spiral body 46 are clearance-matched to form a cutting pair 7. When the spiral body 46 rotates, the cutting pair 7 forms a fluid moving from top to bottom, so that particulate matter and debris in the water body cannot enter the cavity. At the same time, the cutting body 24 cooperates with the spiral body 46 to cut the fiber debris entering the cutting pair 7, thereby blocking most of the debris outside the cavity.

[0027] As a preferred example, the upper end surface of the sealing ring 42 and the upper end surface of the sealing groove 23 form a sealing pair 8; the sealing pair 8 is horizontally arranged; the cutting pair 7 is formed between the spiral body 46 and the cutting body 24; the cutting pair 7 is vertically arranged. The cutting pair 7 and the sealing pair 8 are sequentially formed from outside the cavity to inside the cavity, and the cutting pair 7 and the sealing pair 8 form a labyrinth seal; it can not only block particles from entering the cavity, but also cut fiber debris. The cutting pair 7 and the sealing pair 8 cooperate with each other to further improve the operating environment inside the cavity and ensure the safe operation of the mechanical seal.

[0028] like Figure 4 As shown, as a preferred example, the collector 3 includes a connecting plate 31, a needle brush 32 and a cylinder 33; the cylinder 33 is connected to the connecting plate 31; the needle brush 32 is arranged on the inner and outer circumferences of the cylinder 33. When a small part of fiber debris enters the cavity, the fiber debris will be collected by the needle brush 32 on the collector 3, so that the fiber debris is entangled on the needle brush 32. It is prevented that the fibers are scattered inside the cavity or entangled on the mechanical seal, ensuring that the mechanical seal operates more safely.

[0029] As a preferred example, the collector 3 is coaxially arranged with the impeller 4; the collector 3 is arranged at the end of the mounting groove 22; and the bottom end of the cylinder 33 is located in the sealing groove 23. When the impeller 4 rotates, the collector 3 is stationary and the cylinder 33 is arranged longer, and the bottom end is arranged in the sealing groove 23, so that the collector 3 can have a better collection effect on fiber debris.

[0030] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above specific embodiments. The above specific embodiments and the description in the specification are only for further illustrating the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the claims and their equivalents.

Claims

1. A submersible electric pump with anti-sand and anti-winding functions, characterized in that: The invention comprises a submersible motor (1), a mechanical seal seat (2), a collector (3), an impeller (4), a volute (5) and a bottom cover (6); the upper end of the volute (5) is connected to the lower end of the submersible motor (1); the upper end of the bottom cover (6) is connected to the lower end of the volute (5); the mechanical seal seat (2) passes through the rotor shaft of the submersible motor (1) and is arranged at the lower end of the submersible motor (1), and is located between the submersible motor (1) and the volute (5); the collector (3) is arranged at the lower end of the mechanical seal seat (2); the impeller (4) is arranged at the end of the rotor shaft and is located in the volute (5); the mechanical seal passes through the rotor shaft and is arranged on the mechanical seal seat (2), and is located in the cavity between the impeller (4) and the mechanical seal seat (2); the impeller (4) and the mechanical seal seat (2) are clearance-matched.

2. The submersible electric pump according to claim 1, characterized in that: The impeller (4) comprises blades (41), a sealing ring (42), a cover plate (43), a hub (44), a collecting groove (45) and a spiral body (46); the blades (41) are located at the lower end of the cover plate (43); the sealing ring (42) is located at the upper end of the cover plate (43); the cover plate (43) and the hub (44) are connected; a collecting groove (45) is formed between the sealing ring (42) and the hub (44); and the spiral body (46) is arranged on the outer circumference of the sealing ring (42).

3. The submersible electric pump according to claim 2, characterized in that: The collecting groove (45) is an annular groove and is located on the upper end surface of the cover plate (43).

4. The submersible electric pump according to claim 2, characterized in that: The outer diameter of the sealing ring (42) is equal to the outer diameter of the cover plate (43); the length of the spiral body (46) is equal to the length of the sealing ring (42).

5. The submersible electric pump according to claim 2, characterized in that: The mechanical seal seat (2) comprises a body (21), a mounting groove (22), a sealing groove (23) and a cutting body (24); the mounting groove (22) is located at the inner lower end of the body (21); the sealing groove (23) is located at the lower end of the mounting groove (22); and the cutting body (24) is arranged on the inner circumference of the sealing groove (23).

6. The submersible electric pump according to claim 5, characterized in that: The upper end surface of the sealing ring (42) and the upper end surface of the sealing groove (23) form a sealing pair (8); the sealing pair (8) is arranged horizontally; a cutting pair (7) is formed between the spiral body (46) and the cutting body (24); the cutting pair (7) is arranged vertically.

7. The submersible electric pump according to claim 5, characterized in that: The collector (3) comprises a connecting plate (31), a needle brush (32) and a cylinder (33); the cylinder (33) is connected to the connecting plate (31); and the needle brush (32) is arranged on the inner and outer circumferences of the cylinder (33).

8. The submersible electric pump according to claim 7, characterized in that: The collector (3) is coaxially arranged with the impeller (4); the collector (3) is arranged at the end of the mounting groove (22); and the bottom end of the cylinder (33) is located in the sealing groove (23).

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