A centrifugal pump

Abstract

The utility model relates to centrifugal pump technical field, especially a centrifugal pump, solved the low utilization rate of liquid medium of centrifugal pump in prior art, the poor problem of independent maintenance ability, including with the pump cover that medium tank bottom connects, is equipped with one -way valve and at least one opening downward containing groove on the pump cover, every containing groove all is equipped with centrifugal pump assembly, the upper surface of pump cover is equipped with medium inlet, and medium inlet communicates with the suction chamber of centrifugal pump assembly, and the discharge chamber of centrifugal pump assembly communicates with one -way valve, and one -way valve communicates with liquid supply pipeline. Advantageous effect is: each centrifugal pump assembly is independent, and the independent maintenance of each centrifugal pump assembly is convenient, and the dismounting of centrifugal pump assembly can be carried out without discharging medium tank medium, improves the independent maintenance ability of each centrifugal pump assembly. Centrifugal pump is directly installed at the bottom of medium tank, and medium enters suction chamber without external pipeline, shortens the path of medium into suction chamber, improves the utilization rate of medium.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal pump technology, and in particular to a centrifugal pump. Background Technology

[0002] Centrifugal pumps are core equipment in the fluid transport field, and their reliability and maintainability are crucial for ensuring production continuity. To improve system redundancy and avoid overall shutdown due to single pump failure, the dual centrifugal pump structure is being gradually promoted, reducing downtime risk while ensuring flow stability.

[0003] In the prior art, Chinese patent CN2434454Y discloses a single-stage, single-suction, vertical double centrifugal pump unit. It employs a double pump body with two volutes, with two impellers installed in the two volutes respectively, sharing a single inlet and outlet. Fluid switching is achieved through a movable check valve at the outlet. This structure achieves a backup function through a dual-pump-head design; when one pump head fails, the other can be started to maintain operation, thus improving system reliability to a certain extent.

[0004] However, the aforementioned existing technology still has significant drawbacks: its two pump heads are integrated into the same pump body, sharing core flow channel structures such as the volute, inlet, and outlet. This integrated design means that when one pump head (such as the impeller, corresponding motor, or local flow channel) fails and requires repair, the entire pump body and associated piping must be disassembled, making it impossible to separately repair the faulty pump head. This not only prolongs the repair cycle and increases maintenance costs but may also cause secondary damage to non-faulty parts due to overall disassembly, further affecting system recovery efficiency. In addition, existing centrifugal pumps require separate pipe connections at the inlet and outlet, making installation cumbersome, and they cannot completely drain the liquid medium from the media tank, affecting the utilization rate of the liquid medium in the tank. Utility Model Content

[0005] This invention proposes a centrifugal pump that solves the problems of low utilization rate of liquid media and poor independent maintenance capability of existing centrifugal pumps.

[0006] The technical solution of this utility model is implemented as follows: A centrifugal pump includes a pump cover connected to the bottom of a media tank. The pump cover has a one-way valve and at least one downward-facing receiving slot, each containing a centrifugal pump assembly. The upper surface of the pump cover has a media inlet communicating with the suction chamber of the centrifugal pump assembly. The discharge chamber of the centrifugal pump assembly is connected to the one-way valve, which is connected to a supply pipeline. After the centrifugal pump is installed at the bottom of the media tank, media is added to the tank. The media directly enters the suction chamber of the centrifugal pump assembly from the media inlet, eliminating the need for external piping, shortening the path of the media into the suction chamber, and improving media utilization. Furthermore, multiple centrifugal pump assemblies can be set up simultaneously to extract media from the media tank, effectively improving the working efficiency of the centrifugal pump. The one-way valve ensures that each centrifugal pump assembly operates independently, preventing media backflow. The receiving slots isolate the centrifugal pump assembly from the media in the media tank, providing protection for the centrifugal pump assembly.

[0007] The pump housing is equipped with an inlet channel and an outlet channel. The inlet channel connects the medium inlet and the suction chamber, while the outlet channel connects the discharge chamber and the check valve. A valve is also provided inside the pump housing to control the opening and closing of the inlet channel. Controlling the inlet channel by opening and closing the valve facilitates independent maintenance of each centrifugal pump component and allows for disassembly and assembly of the centrifugal pump components without discharging the medium from the medium tank.

[0008] The upper surface of the pump cover is provided with an annular sealing groove, and a sealing ring is installed inside the annular sealing groove; the medium inlet, the receiving tank, and the one-way valve are all located on the inner side of the annular sealing groove. The sealing ring ensures the sealing between the pump cover and the medium tank, preventing leakage from the medium tank.

[0009] The centrifugal pump assembly is connected to the pump cover by connecting bolts. The connecting bolts ensure the stability of the connection between the centrifugal pump assembly and the pump cover, and at the same time, the centrifugal pump assembly can be disassembled by removing the connecting bolts during maintenance, improving the convenience of maintenance.

[0010] The centrifugal pump assembly includes a motor, an impeller, and a controller. The motor is located inside the housing, the impeller is located below the motor and connected to the motor's output shaft, the suction chamber is located below the impeller, and the controller is located below the suction chamber.

[0011] A protective cover is connected to the lower side of the pump housing to provide protection for the controller. During normal operation of the centrifugal pump, the protective cover protects the centrifugal pump assembly.

[0012] The pump cover is equipped with an exhaust assembly. When adding medium into the medium tank, the medium enters the suction chamber of the centrifugal pump assembly through the medium inlet. The air in the suction chamber is discharged into the medium chamber through the automatic exhaust assembly, which avoids negative pressure in the suction chamber of the centrifugal pump assembly and prevents air from being unable to escape.

[0013] The exhaust assembly includes an exhaust valve core and an exhaust port. The exhaust valve core is movably mounted on the pump cover, and the exhaust port is located on the upper surface of the pump cover. The exhaust port communicates with the liquid outlet channel through an exhaust channel inside the pump cover. The upper end of the exhaust valve core engages with the exhaust port; the lower end of the exhaust valve core extends downwards out of the pump cover. Air in the intake chamber enters the liquid outlet channel through the discharge chamber, and then enters the medium tank through the exhaust channel, thus expelling the air from the intake chamber.

[0014] The number of check valves corresponds to the number of centrifugal pump assemblies. The inlet of each check valve is connected to a centrifugal pump assembly via a liquid outlet channel, and the outlets of each check valve are connected to a liquid supply pipeline via a multi-port connector. The centrifugal pump assemblies operate independently; as long as one centrifugal pump assembly is functioning normally, this novel centrifugal pump can output pressurized media to the system.

[0015] The one-way valve includes a one-way valve core, a support ring on the pump cover, and the one-way valve core slidably disposed within the support ring. A spring is provided between the one-way valve core and the pump cover. An annular sealing block is provided at the lower end of the support ring, and the one-way valve core cooperates with the sealing block. The support ring guides the one-way valve core, ensuring accurate installation of the one-way valve core.

[0016] The beneficial effects of this invention are as follows: The centrifugal pump consists of multiple centrifugal pump components, each operating independently. As long as one component is functioning normally, the new centrifugal pump can output pressurized media to the system. Each component is independent, facilitating independent maintenance and allowing for assembly and disassembly without discharging the media from the media tank, thus improving independent maintenance capabilities. The centrifugal pump is directly installed at the bottom of the media tank. When media is added to the tank, it enters the suction chamber of the centrifugal pump component directly from the media inlet, eliminating the need for external piping, shortening the path for the media to enter the suction chamber, and improving media utilization.

[0017] When the medium is added to the medium tank, the automatic venting component can expel the air from the suction chamber of the centrifugal pump assembly, preventing negative pressure from forming in the suction chamber and preventing air from being expelled; at the same time, it eliminates the need for manual venting and is easy to operate. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a top view of a centrifugal pump according to the present invention; Figure 2 for Figure 1 Sectional view of AA; Figure 3 for Figure 1 CC section view.

[0020] In the diagram: 1. Pump cover, 11. Receiving tank, 12. Liquid outlet channel, 13. Exhaust channel, 14. Medium inlet, 15. Exhaust port, 2. Centrifugal pump assembly, 21. Motor, 22. Impeller, 23. Suction chamber, 24. Controller, 3. Check valve, 31. Check valve core, 32. Support ring, 33. Sealing block, 4. T-connector, 5. Liquid supply pipeline, 6. Protective cover, 7. Exhaust valve core, 8. Connecting bolts. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example 1, such as Figure 1 , Figure 2 , Figure 3 As shown, a centrifugal pump includes a pump cover 1 connected to the bottom of a medium tank. The pump cover 1 is provided with a one-way valve 3 and at least one downward-facing receiving groove 11, each receiving groove 11 containing a centrifugal pump assembly 2. The upper surface of the pump cover 1 is provided with a medium inlet 14, which communicates with the suction chamber 23 of the centrifugal pump assembly 2. The discharge chamber of the centrifugal pump assembly 2 is communicated with the one-way valve 3, and the one-way valve 3 is communicated with the liquid supply pipeline 5. In this embodiment, the pump cover 1 is provided with two receiving grooves 11 and two one-way valves 3, with the one-way valve 3 located between the two receiving grooves 11. The centrifugal pump assemblies 2 in the two receiving grooves 11 are independent of each other and do not affect each other's operation. As long as one centrifugal pump assembly 2 is working normally, the centrifugal pump can output pressurized medium to the system. Specifically, the centrifugal pump is directly installed at the bottom of the fuel tank. After the centrifugal pump is installed, fuel is added to the fuel tank and then directly enters the suction chamber 23 of the centrifugal pump assembly 2 through the medium inlet 14, without the need for external piping, shortening the path of fuel into the suction chamber 23 and improving the utilization rate of the medium. After the centrifugal pump assembly 2 is started, each centrifugal pump assembly 2 delivers fuel to the check valve 3, and then the fuel flows out after merging into the liquid supply pipeline 5, thus realizing fuel liquid supply.

[0023] Furthermore, the pump housing 1 is equipped with an inlet channel and an outlet channel 12. The inlet channel connects the medium inlet 14 and the suction chamber 23, and the outlet channel 12 connects the discharge chamber and the check valve 3. The check valve 3 prevents the backflow of fuel entering the supply pipeline 5. Without needing to clear the supply pipeline 5, the two independent centrifugal pump assemblies 2 can be directly disassembled and assembled, facilitating independent maintenance of each centrifugal pump assembly 2 and improving the convenience of maintenance operations.

[0024] Furthermore, the pump cover 1 is equipped with a valve for controlling the opening and closing of the liquid inlet channel. When it is necessary to disassemble the centrifugal pump assembly, the valve is closed first to close the liquid inlet channel, thereby preventing the fuel in the tank from flowing down through the medium inlet 14 and the liquid inlet channel. At this time, the fuel in the tank is isolated from the space under the pump cover 1, and the centrifugal pump assembly can be replaced when there is fuel in the tank.

[0025] Furthermore, the upper surface of the pump cover 1 is provided with an annular sealing groove, and a sealing ring is provided inside the annular sealing groove; the medium inlet 14, the receiving groove 11, and the one-way valve 3 are all located on the inner side of the annular sealing groove. The pump cover 1 is provided with a flange ring, and the annular sealing groove is located on the upper surface of the flange ring. The flange ring is connected to the bottom of the fuel tank by bolts, realizing the installation of the pump cover 1 at the bottom of the fuel tank; after the pump cover 1 is installed, the sealing ring seals the gap between the flange ring and the bottom wall of the fuel tank to prevent fuel leakage.

[0026] Furthermore, the centrifugal pump assembly 2 is connected to the pump cover 1 via connecting bolts 8. The connecting bolts 8 are inserted from below the centrifugal pump assembly 2 and pass upward through the centrifugal pump assembly 2 to connect with the pump cover 1, facilitating the disassembly and assembly of the centrifugal pump assembly 2 from below the pump cover 1.

[0027] Furthermore, the centrifugal pump assembly 2 includes a motor 21, an impeller 22, and a controller 24. The motor 21 is located within the receiving tank 11, the impeller 22 is located below the motor 21 and connected to the output shaft of the motor 21, the suction chamber 23 is located below the impeller 22, and the controller 24 is located below the suction chamber 23. The controller 24 controls the start and stop of the motor 21. When the motor 21 starts, it drives the impeller 22 to rotate, thereby pressurizing and delivering fuel. The receiving tank 11 provides protection for the electrode 21, preventing fuel from contacting the motor 21 and ensuring that the motor 21 can operate normally.

[0028] Furthermore, a protective cover 6 is connected to the lower side of the pump cover 1 to provide protection for the controller 24. When the centrifugal pump is operating normally, the protective cover 6 provides protection for the controller 24.

[0029] Example 2, based on Example 1, provides a centrifugal pump with an exhaust assembly on the pump housing 1. When fuel is added to the fuel tank, the fuel medium enters the suction chamber 23 and discharge chamber of the centrifugal pump assembly 2 through the medium inlet 14. The air in the suction chamber 23 and discharge chamber is discharged into the fuel tank through the exhaust assembly, preventing negative pressure from occurring in the suction chamber 23 and discharge chamber of the centrifugal pump assembly, thus avoiding the situation where air cannot be expelled.

[0030] Furthermore, the exhaust assembly includes an exhaust valve core 7 and an exhaust port 15. The exhaust valve core 7 is movably mounted on the pump cover 1, and the exhaust port 15 is located on the upper surface of the pump cover 1. The exhaust port 15 communicates with the liquid outlet channel 12 through the exhaust channel 13 inside the pump cover 1. The upper end of the exhaust valve core 7 cooperates with the exhaust port 15; the lower end of the exhaust valve core 7 extends downward out of the pump cover 1. The position of the exhaust port 15 is higher than the position of the medium inlet 14. When fuel enters the centrifugal pump, it first enters the suction chamber 23 located at the lower position, and then enters the impeller position, the discharge chamber, and the liquid outlet channel 12. The air in the suction chamber 23 enters the liquid outlet channel 12 through the discharge chamber, and then enters the fuel tank from the exhaust channel 13 and the exhaust port 15, realizing the automatic discharge of air from the suction chamber 23 and the discharge chamber.

[0031] In addition, the exhaust valve core 7 is threadedly connected to the pump cover 1. When the centrifugal pump assembly needs to be disassembled, the protective cover 6 is removed, and the lower end of the exhaust valve core 7 is rotated to raise the exhaust valve core 7 and block the exhaust port 15, preventing fuel in the fuel tank from flowing downward through the exhaust port 15 and the exhaust channel 13. The pump cover 1 is equipped with a valve for controlling the opening and closing of the liquid inlet channel. When the centrifugal pump assembly needs to be disassembled, the valve is closed first to close the liquid inlet channel, thereby preventing fuel in the fuel tank from flowing downward through the medium inlet 14 and the liquid inlet channel. At this time, both the exhaust port and the medium inlet 14 are closed, and the fuel in the fuel tank is isolated from the space under the pump cover 1, thereby preventing fuel leakage from the exhaust port when the centrifugal pump assembly is independently repaired. The centrifugal pump assembly can be replaced when there is fuel in the fuel tank, and independent repair of the centrifugal pump assembly can be carried out without draining the fuel tank, improving convenience.

[0032] Furthermore, the number of check valves 3 corresponds to the number of centrifugal pump assemblies 2. The inlet of one check valve 3 is connected to one centrifugal pump assembly 2 through the liquid outlet channel 12, and the outlets of each check valve 3 are connected to the liquid supply pipeline 5 through a multi-port connector. In this embodiment, the multi-port connector is a three-way connector 4. Each centrifugal pump assembly 2 does not affect the others. As long as one centrifugal pump assembly 2 is working normally, the new centrifugal pump can output pressurized medium to the system, effectively improving the reliability of the centrifugal pump.

[0033] Furthermore, the one-way valve includes a one-way valve core 31, a support ring 32 on the pump cover 1, the one-way valve core 31 being slidably disposed within the support ring 32, a spring being provided between the one-way valve core 31 and the pump cover 1, and an annular sealing block 33 being provided at the lower end of the support ring 32, with the one-way valve core 31 cooperating with the sealing block 33. When the centrifugal pump stops, the one-way valve core 31 moves downward under the action of the spring, and the lower end of the one-way valve core 31 fits against the sealing block 33, achieving a seal and preventing fuel backflow in the liquid supply pipeline 5.

[0034] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A centrifugal pump, characterized in that, The pump housing (1) is connected to the bottom of the medium tank. The pump housing (1) is provided with a one-way valve (3) and at least one downward-facing receiving groove (11). Each receiving groove (11) is provided with a centrifugal pump assembly (2). The upper surface of the pump housing (1) is provided with a medium inlet (14). The medium inlet (14) is connected to the suction chamber (23) of the centrifugal pump assembly (2). The discharge chamber of the centrifugal pump assembly (2) is connected to the one-way valve (3). The one-way valve (3) is connected to the liquid supply pipeline (5).

2. The centrifugal pump according to claim 1, characterized in that, The pump housing (1) is provided with an inlet channel and an outlet channel (12). The inlet channel connects the medium inlet (14) and the suction chamber (23). The outlet channel (12) connects the discharge chamber and the check valve (3). The pump housing (1) is provided with a valve for controlling the opening and closing of the inlet channel.

3. The centrifugal pump according to claim 2, characterized in that, The upper surface of the pump cover (1) is provided with an annular sealing groove, and a sealing ring is provided inside the annular sealing groove; the medium inlet (14), the receiving groove (11) and the one-way valve (3) are all located on the inner side of the annular sealing groove.

4. The centrifugal pump according to claim 3, characterized in that, The centrifugal pump assembly (2) is connected to the pump cover (1) by connecting bolts (8).

5. The centrifugal pump according to any one of claims 1 to 4, characterized in that, The centrifugal pump assembly (2) includes a motor (21), an impeller (22) and a controller (24). The motor (21) is located in the receiving tank (11), the impeller (22) is located below the motor (21) and connected to the output shaft of the motor (21), the suction chamber (23) is located below the impeller (22), and the controller (24) is located below the suction chamber (23).

6. The centrifugal pump according to claim 5, characterized in that, A protective cover (6) is connected to the lower side of the pump cover (1) to provide protection for the controller (24).

7. The centrifugal pump according to claim 1 or 6, characterized in that, An exhaust assembly is provided on the pump cover (1).

8. The centrifugal pump according to claim 7, characterized in that, The exhaust assembly includes an exhaust valve core (7) and an exhaust port (15). The exhaust valve core (7) is movably mounted on the pump cover (1). The exhaust port (15) is located on the upper surface of the pump cover (1). The exhaust port (15) is connected to the liquid outlet channel (12) through the exhaust channel (13) inside the pump cover (1). The upper end of the exhaust valve core (7) cooperates with the exhaust port (15). The lower end of the exhaust valve core (7) extends downward out of the pump cover (1).

9. The centrifugal pump according to claim 8, characterized in that, The number of check valves (3) corresponds to the number of centrifugal pump assemblies (2). The inlet of one check valve (3) is connected to one centrifugal pump assembly (2) through the liquid outlet channel (12), and the outlets of each check valve (3) are connected through the multi-port connector liquid supply pipeline (5).

10. The centrifugal pump according to claim 9, characterized in that, The check valve includes a check valve core (31), a support ring (32) is provided on the pump cover (1), the check valve core (31) is slidably disposed in the support ring (32), a spring is provided between the check valve core (31) and the pump cover (1), and an annular sealing block (33) is provided at the lower end of the support ring (32), and the check valve core (31) and the sealing block (33) cooperate.

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