Submerged water feeding pump with shutdown water retention function

Abstract

A submerged water feeding pump with a shutdown water retention function comprises a motor, a base, a pump outer pipe, an inner pipe, a pump shaft, a flow guide pipe, a guide vane and an impeller, and is characterized in that a sealing seat is arranged at an outlet of the guide vane, and a valve clack is sleeved on the inner pipe corresponding to the outlet of the guide vane; the outer wall of the inner pipe or the inner wall of the flow guide pipe is provided with a limiting piece used for limiting the valve clack to move upwards to the upper limit position after the valve clack is opened so as to ensure the overflowing area. The contact portion of the lower end face of the valve clack and the upper end face of the sealing seat is a sealing contact face. When the water feeding pump runs, liquid passing through the flow channel between the guide vane and the impeller exerts pressure upwards to enable the valve clack to move upwards and be opened, the liquid flows out through the flow channel between the valve clack and the flow guide pipe, and when the water feeding pump stops, the valve clack falls reversely to enable the sealing face between the valve clack and the sealing seat to be attached, and the liquid in the pump cavity is stored. In addition, the quick starting device is simple in structure, easy to process, reliable in sealing and long in service life.

Description

Submersible water pump with water retention function during shutdown Technical Field

[0001] This utility model relates to a submersible water pump for use in coal mines, and more particularly to a submersible water pump for use in coal mines with a shutdown water retention function. Background Technology

[0002] Traditional main drainage pumps operating underground in coal mines suffer from four problems: pump cavitation, low pump efficiency, short service life, and slow start-up. Many design institutes and coal mines have attempted to use booster pumps (including submersible pumps and horizontal feed pumps) upstream of the main drainage pump, forming a drainage pump group with the main drainage pump, primarily to address the cavitation problem. However, the aforementioned booster pumps have several structural issues. For example, while submersible pumps can solve the cavitation problem, they are inconvenient to maintain, have a high failure rate, and poor safety, making them unsuitable for underground coal mine use. Horizontal feed pumps, although they can partially solve the suction head problem of the main drainage pump, require vacuuming and pump body vacuum checks, which is cumbersome and increases the potential for pump group failure, thus limiting their widespread adoption.

[0003] Using a submersible feed pump and a main drainage pump to form a drainage pump set can effectively solve this problem. The submersible feed pump has a vertical structure with a submerged impeller and the motor is above ground, making it suitable for use in coal mines. However, this structure has the following problems: the submersible feed pump starts first, filling the main drainage pump with water before starting it. After stopping, the water pumped by the main drainage pump returns to the suction well through the connecting pipe, the flow channel between the inner and outer pipes of the feed pump, the guide vanes, and the impeller flow channel. Restarting the pump set requires repeating the process of starting the feed pump, filling the main drainage pump with water, and then starting the main drainage pump after a delay. If the distance between the suction well and the main drainage pump is far, the start-up time is even longer, failing to achieve rapid emergency response and adversely affecting safe production. Summary of the Invention

[0004] The purpose of this utility model is to provide a submersible water feeder pump with a shutdown water retention function. After the pump stops, the pump chambers of the submersible water-retaining feeder pump and the main drainage pump can be kept full of water. When restarting, the feeder pump and the main drainage pump can be started simultaneously to achieve the purpose of rapid start-up. It has a simple structure, is easy to process, has reliable sealing, and has a long service life.

[0005] A submersible water pump with water retention function includes a motor, a base, an outer pipe, an inner pipe, a pump shaft, a guide pipe, guide vanes, and an impeller. Its key feature is that a sealing seat is provided at the guide vane outlet, and a valve disc is fitted onto the inner pipe corresponding to the guide vane outlet. A limiting element is provided on the outer wall of the inner pipe or the inner wall of the guide pipe to limit the upper limit of the valve disc's upward movement after opening, ensuring the flow area. The contact area between the lower end face of the valve disc and the upper end face of the sealing seat is a sealing contact surface. When the water pump is running, the liquid flowing through the channel between the guide vane and the impeller exerts upward pressure, causing the valve disc to move upward and open. The liquid flows out through the channel between the valve disc and the guide pipe. When the water pump stops, the valve disc falls in the opposite direction, causing the sealing surface between the valve disc and the sealing seat to adhere, thus retaining the liquid in the pump chamber.

[0006] Furthermore, the sealing seat and the guide vane are either an integral structure or separate structures. When they are separate structures, the sealing seat is embedded in the upper end face of the guide vane and there is a sealing fit between them.

[0007] Furthermore, the sealing contact surface is an inner and outer ring and is located on both the inner and outer sides of the guide vane outlet.

[0008] Furthermore, the sealing seat has an inner and outer ring structure, with a flow channel formed between the two rings and connected by connecting ribs, and the flow channel between the two rings forms a flow channel between the inner and outer rings.

[0009] Furthermore, the sealing contact surface is made of steel, stainless steel, or hard alloy.

[0010] Furthermore, the limiting member is a limiting platform and is located on the outer wall of the inner tube.

[0011] Furthermore, a bushing is fixedly installed in the inner hole of the valve disc, and the bushing moves integrally with the valve disc.

[0012] The beneficial effects of this invention are as follows: When the feed pump is running, the liquid flowing through the channel between the guide vane and the impeller exerts upward pressure, causing the valve disc to move upward and open. The liquid flows out through the channel between the valve disc and the guide pipe. When the feed pump stops, the valve disc falls in the opposite direction, causing the sealing contact surface between the valve disc and the sealing seat to close, thus preserving the liquid in the pump chamber. This keeps both the main drain pump and the feed pump chambers full of water, allowing for simultaneous startup of both pumps upon restarting, achieving rapid start-up. Furthermore, the design is simple, easy to process, has low production costs, reliable sealing, and a long service life. Attached Figure Description

[0013] Figure 1 is a schematic diagram of the submersible water pump structure according to an embodiment of the present invention;

[0014] Figure 2 is a schematic diagram of the inner tube structure in Figure 1;

[0015] Figure 3 is a schematic diagram of the valve disc structure in Figure 1;

[0016] Figure 4 is a schematic diagram of the sealing seat structure in Figure 1;

[0017] Figure 5 is a top view of Figure 4;

[0018] Figure 6 is a schematic diagram of the pump unit structure consisting of the submersible feed pump and the main drain pump of this utility model.

[0019] Figure 7 is a partial structural schematic diagram of another embodiment of the present invention. Detailed Implementation

[0020] As shown in Figures 1-5, a submersible water pump with water retention function includes a motor 1, a motor base 2, a base 3, an outer pump pipe 4, an outlet pipe 5, an inner pipe 8, a pump shaft 6, a guide bearing 14, a guide pipe 7, a guide vane 11, and an impeller 13. The guide pipe 7 is located at the water outlet end of the guide vane 11 and expands downwards. A sealing seat 12 is provided at the outlet of the guide vane. A valve disc 9 is fitted on the inner pipe 8 corresponding to the outlet of the guide vane 11. A feature is provided on the outer wall of the inner pipe to limit the upward movement of the valve disc 9 after it is opened. The limiting member 801 at the upper limit position ensures the flow area. The contact part between the lower end face of the valve disc 9 and the upper end face of the sealing seat 12 is the sealing contact surface 15. When the water pump is running, the liquid passing through the flow channel between the guide vane 11 and the impeller 13 applies upward pressure to make the valve disc 9 move upward and open. The liquid flows out through the flow channel between the valve disc 9 and the guide pipe 7. When the water pump stops, the valve disc 9 falls in the opposite direction to make the sealing surface between the valve disc 9 and the sealing seat 12 fit together, thus preserving the liquid in the pump chamber.

[0021] Furthermore, the sealing seat 12 and the guide vane 11 are separate structures, with the sealing seat 12 embedded in the upper end face of the guide vane 11 and sealingly fitted therebetween. Alternatively, the sealing seat 12 and the guide vane can be an integral structure.

[0022] Furthermore, the sealing contact surface 15 is an inner and outer ring and is located on both the inner and outer sides of the outlet of the guide vane 11.

[0023] Furthermore, the sealing seat 12 has an inner and outer ring structure, with a flow channel formed between the two rings and connected by a connecting rib 1201, and the flow channel between the two rings forms a flow channel between the inner and outer rings.

[0024] Furthermore, the sealing contact surface 15 is made of steel, stainless steel or hard alloy.

[0025] Furthermore, the limiting member 801 is a limiting platform and is located on the outer wall of the inner tube 8.

[0026] Furthermore, a copper bushing 10 is fixedly installed in the inner hole of the valve disc 9, and the bushing 10 moves integrally with the valve disc 9.

[0027] As shown in Figure 6, the submersible feed pump and the main drain pump 16 form a pump set. When the feed pump is running, the liquid flowing through the channel between the guide vane 11 and the impeller 13 applies upward pressure, causing the valve disc 9 to move upward and open. The liquid flows out through the channel between the valve disc 9 and the guide pipe 7. When the feed pump stops, the valve disc 9 falls in the opposite direction, causing the sealing contact surface 14 between the valve disc 9 and the sealing seat 12 to close, thus preserving the liquid in the pump chamber. This keeps the pump chambers of the main drain pump and the feed pump full of water, allowing the feed pump and the main drain pump to be started simultaneously upon restart, achieving rapid start-up.

[0028] As shown in Figure 7, in another embodiment of this utility model, a limiting member 801 is provided on the inner wall of the 7 guide tube to limit the upper limit position of the valve disc after it is opened, so as to ensure the flow area.

[0029] The above are merely specific embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A submersible feed pump with a shutdown water retention function, comprising a motor, a base, an outer pump pipe, an inner pump pipe, a pump shaft, a guide pipe, guide vanes, and an impeller, characterized in that, A sealing seat is provided at the outlet of the guide vane, and a valve disc is fitted on the inner tube corresponding to the outlet of the guide vane. A limiting element is provided on the outer wall of the inner tube or the inner wall of the guide tube to limit the upper limit position of the valve disc after it is opened to ensure the flow area. The contact part between the lower end face of the valve disc and the upper end face of the sealing seat is the sealing contact surface. When the water pump is running, the liquid passing through the flow channel between the guide vane and the impeller applies upward pressure to make the valve disc move upward and open. The liquid flows out through the flow channel between the valve disc and the guide tube. When the water pump stops, the valve disc falls in the opposite direction to make the sealing surface between the valve disc and the sealing seat fit together, thus preserving the liquid in the pump chamber.

2. The submersible feed pump with shutdown water retention function according to claim 1, characterized in that, The sealing seat and the guide vane are either an integral structure or separate structures. When they are separate structures, the sealing seat is embedded in the upper end face of the guide vane and there is a sealing fit between them.

3. The pump according to claim 1, wherein The sealing contact surface is an inner and outer ring and is located on both the inner and outer sides of the guide vane outlet.

4. The pump according to claim 1, wherein The sealing seat has an inner and outer ring structure, with a flow channel formed between the two rings and connected by a connecting rib. The flow channel between the two rings forms a flow channel between the inner and outer rings.

5. The submersible feed pump with shutdown water retention function according to claim 1, characterized in that, The sealing contact surface is made of steel, stainless steel or hard alloy.

6. The pump according to claim 1, wherein The limiting component is a limiting platform and is located on the outer wall of the inner tube.

7. The submersible feed pump with shutdown water retention function according to claim 1, characterized in that, A bushing is fixedly installed in the inner hole of the valve disc, and the bushing moves integrally with the valve disc.

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