Centrifugal pump

Abstract

The utility model discloses a centrifugal pump, which relates to the technical field of centrifugal pumps and comprises a motor, a pump support body is fixed on one side of the motor, a sealing plate is arranged on one side, far away from the motor, of the pump support body, and a pump shell is arranged on one side, far away from the pump support body, of the sealing plate. The sealing plate comprises a pump body rear cover plate, a machine seal cleaning cavity is formed in the pump body rear cover plate, a shaft hole is formed in the position, located at the machine seal cleaning cavity, of the pump body rear cover plate, a machine seal spring seat is arranged on one side of the pump body rear cover plate, a pump body sealing groove is formed in the pump body rear cover plate, and a liquid baffle is fixed to the pump body rear cover plate. By changing the shape of the inner sealing plate and forming the optimized annular groove flow channel in the rear cover plate of the pump body, a complete liquid baffle can be formed in the rear portion of the open type impeller, liquid is prevented from being thrown out behind the impeller, and the liquid can efficiently rotate in the impeller and is guided into the convex flow channel along a pump cavity.

Description

Technical Field

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

[0002] A centrifugal pump is a pump that uses the centrifugal force generated by the rotation of an impeller to transport liquids. Before starting the pump, the pump casing and suction pipe must be filled with water. Then the motor is started, and the pump shaft drives the impeller and water to rotate at high speed. The water undergoes centrifugal motion and is thrown towards the outer edge of the impeller, flowing into the pump's discharge pipe through the flow channel of the volute casing.

[0003] The drawback of the internal sealing plate in existing centrifugal pumps is that the recessed part of the baffle plate behind the open impeller is not covered, which causes the fluid of the open impeller to be thrown out to the recessed part, reducing the efficiency of the open impeller and resulting in poor water delivery effect of the centrifugal pump. Therefore, it is necessary to optimize a centrifugal pump through technological innovation and design optimization. Utility Model Content

[0004] The drawback of existing centrifugal pumps with internal sealing plates is that the recessed portion of the baffle plate behind the open impeller is not shielded, causing fluid to be thrown out of the recessed portion of the open impeller, reducing the efficiency of the open impeller and resulting in poor water delivery performance of the centrifugal pump. To solve the above problems, this application provides a centrifugal pump that, by changing the shape of the internal sealing plate and creating an optimized annular groove flow channel on the rear cover plate of the pump body, allows a complete baffle plate to be formed at the rear of the open impeller, preventing liquid from being thrown out behind the impeller. The liquid can rotate efficiently within the impeller and be guided into the convex flow channel along the pump cavity. The optimized design of the annular groove flow channel significantly reduces hydraulic losses, thereby effectively increasing the pump's flow rate and pressure, and significantly improving the pump's head. By setting a convex flow channel, the momentum of the inlet fluid is enhanced, the pressure difference at the liquid inlet is reduced, the pump's net positive suction head (NPSH) is reduced, and the suction force at the pump inlet is increased. This further reduces the circumferential flow of liquid in the pump chamber and forces viscous media to flow towards the outlet. By increasing the pressure, a high negative pressure suction state is formed at the inlet. At the same time, this design is durable and also has the advantages of being compact, lightweight, easy to clean, and having low energy consumption.

[0005] The technical solution adopted by the embodiments of this application to solve its technical problem is:

[0006] A centrifugal pump, comprising:

[0007] The motor has a pump bracket body fixed to one side, a sealing plate is provided on the side of the pump bracket body away from the motor, and a pump casing is provided on the side of the sealing plate away from the pump bracket body.

[0008] The sealing plate includes a pump body rear cover plate, on which an organic seal cleaning chamber is formed. A shaft hole is formed on the pump body rear cover plate at the location of the organic seal cleaning chamber. An organic seal spring seat is provided on one side of the pump body rear cover plate. A pump body sealing groove is formed on the pump body rear cover plate. A baffle plate is fixed on the pump body rear cover plate.

[0009] In one possible implementation, the pump casing is provided with an inlet and an outlet, so that water can enter the pump casing from the inlet and be discharged from the outlet.

[0010] In one possible implementation, the pump body rear cover plate has an optimized annular groove flow channel with an arc-shaped inner wall, and the baffle plate has a convex flow channel.

[0011] The optimized annular groove flow channel prevents liquid from being thrown out behind the open impeller due to the complete baffle plate. This ensures efficient rotation of the liquid within the open impeller, guiding it along the pump cavity into the convex flow channel, reducing hydraulic losses and increasing pump flow rate and pressure. This also improves pump head and ensures the fluid is not negatively affected by shearing or vibration, guaranteeing liquid quality and stability. For conveying corrosive environments or high-temperature fluids, this design maintains good performance and durability, making it suitable for more demanding industrial applications.

[0012] Simultaneously, the optimized annular groove flow channel design has a wide range of applications, suitable for various industries and fluid types, especially for conveying high-viscosity, particulate, or sensitive liquids. It can efficiently handle not only traditional water-based liquids but also complex liquid media such as dairy products, chemical solutions, food and beverages, and pharmaceuticals. In fluid conveying systems requiring high precision and efficiency, it ensures that the fluid is not negatively affected by shearing, vibration, etc., guaranteeing the quality and stability of the liquid. For conveying corrosive environments or high-temperature fluids, this design also maintains good performance and durability, making it suitable for more demanding industrial applications.

[0013] The convex flow channel enhances the momentum of the inlet fluid, reduces the pressure difference at the liquid inlet, reduces the pump's net positive suction head (NPSH), and increases the suction force at the pump inlet. This reduces the circumferential flow of the liquid in the pump chamber and forces viscous media to flow towards the outlet. By increasing the pressure, a high negative pressure suction state is formed at the inlet. At the same time, this design is durable and also has the advantages of being compact, lightweight, easy to clean, and energy-efficient.

[0014] Because the convex flow channel design optimizes the pump's hydraulic performance and reduces internal liquid flow turbulence, it directly reduces wear on internal pump components, thereby improving the pump's durability and service life. It also reduces problems such as cavitation, pressure fluctuations, and liquid turbulence, allowing the pump to maintain stable performance under prolonged high-load operation, reducing failure rates and maintenance needs. For applications operating under high loads or continuous operation (such as dairy processing, pharmaceuticals, and chemicals), minimizing downtime and maintenance costs is crucial; extending equipment life is key to improving productivity and reducing total cost of ownership.

[0015] Furthermore, this design effectively reduces noise and vibration, minimizing the mechanical burden on the pump and environmental noise during operation, thus contributing to a quieter and more comfortable working environment. In addition, the low-noise and low-vibration operation extends the service life of the pump and related equipment, reducing maintenance costs and downtime.

[0016] In one possible implementation, the pump body rear cover plate is provided with a plurality of pump body fixing holes, and bolts are provided inside the plurality of pump body fixing holes. The pump body rear cover plate and the pump casing are fixedly connected by bolts, which facilitates the fixing of the pump body rear cover plate and the pump casing and forms a sealed space.

[0017] In one possible implementation, a spring seat fixing threaded hole is provided on the pump body rear cover plate, and the mechanical seal spring seat is threadedly connected to the pump body rear cover plate by screws, so as to facilitate the fixing of the mechanical seal spring seat to the pump body rear cover plate.

[0018] In one possible implementation, the pump body rear cover plate is provided with a pump bracket fixing threaded hole, which can be fixed to the pump bracket body by bolts, so as to facilitate the fixing of the pump bracket fixing threaded hole to the pump bracket body.

[0019] In one possible implementation, the motor output end passes through the pump bracket body and is inserted into the shaft hole. The motor output end is fixedly connected to the open impeller. The motor drives the open impeller to rotate, and the water flow enters the optimized annular groove flow channel under the action of the open impeller.

[0020] In summary, this utility model has at least one of the following beneficial technical effects:

[0021] 1. By changing the shape of the inner sealing plate, an optimized annular groove flow channel is opened on the rear cover plate of the pump body, which allows the rear of the open impeller to form a complete baffle plate, preventing the liquid from being thrown out behind the impeller. The liquid can rotate efficiently in the impeller and be guided into the convex flow channel along the pump cavity.

[0022] 2. By optimizing the design of the annular groove flow channel, hydraulic losses are greatly reduced, thereby effectively increasing the pump's flow rate and pressure, and significantly improving the pump's head.

[0023] 3. By setting a convex flow channel, the convex flow channel can enhance the momentum of the inlet fluid, reduce the pressure difference at the liquid inlet, reduce the pump's net positive suction head (NPSH), and increase the suction force at the pump inlet. This reduces the circumferential flow of the liquid in the pump chamber and forces viscous media to flow towards the outlet. By increasing the pressure, a high negative pressure suction state is formed at the inlet. At the same time, this design is durable and also has the advantages of being compact, lightweight, easy to clean, and having low energy consumption. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0025] Figure 2 This is a schematic diagram of the present invention with the pump casing removed;

[0026] Figure 3 This is an exploded view of the overall structure of this utility model;

[0027] Figure 4 This is a schematic diagram of the front structure of the inner sealing plate of this utility model;

[0028] Figure 5 This is a side view of the inner sealing plate of this utility model;

[0029] Figure 6 This is a schematic diagram of the back structure of the inner sealing plate of this utility model.

[0030] Reference numerals in the attached drawings: 1. Motor; 2. Pump bracket body; 3. Pump body rear cover plate; 4. Pump casing; 5. Open impeller; 6. Shaft hole; 7. Baffle plate; 8. Mechanical seal cleaning chamber; 9. Pump body sealing groove; 10. Convex flow channel; 11. Optimized annular groove flow channel; 12. Spring seat fixing threaded hole; 13. Mechanical seal spring seat; 14. Pump bracket fixing threaded hole; 15. Pump body fixing hole. Detailed Implementation

[0031] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The instrument placement rack involved in this utility model is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0032] This embodiment describes the specific structure of a centrifugal pump, see details below. Figures 1-6 As shown, a centrifugal pump includes:

[0033] Motor 1, pump bracket body 2 is fixed on one side of motor 1, a sealing plate is provided on the side of pump bracket body 2 away from motor 1, and a pump casing 4 is provided on the side of sealing plate away from pump bracket body 2.

[0034] The sealing plate includes a pump body rear cover plate 3, an organic seal cleaning chamber 8 is opened on the pump body rear cover plate 3, a shaft hole 6 is opened on the pump body rear cover plate 3 at the position of the organic seal cleaning chamber 8, an organic seal spring seat 13 is provided on one side of the pump body rear cover plate 3, a pump body sealing groove 9 is opened on the pump body rear cover plate 3, and a liquid baffle plate 7 is fixed on the pump body rear cover plate 3.

[0035] Furthermore, the pump casing 4 is provided with an inlet and an outlet, so that water can enter the pump casing 4 from the inlet and be discharged from the outlet.

[0036] It is worth noting that the pump body rear cover plate 3 has an optimized annular groove flow channel 11, the inner wall of the optimized annular groove flow channel 11 is arc-shaped, and the baffle plate 7 has a convex flow channel 10.

[0037] The optimized annular groove flow channel 11 ensures that the liquid collected by the complete baffle plate 7 behind the open impeller 5 will not be thrown out behind the open impeller 5, guaranteeing efficient rotation of the liquid within the open impeller 5 and its introduction into the convex flow channel 10 along the pump cavity. This reduces hydraulic losses, thereby increasing the pump's flow rate and pressure, improving the pump's head, and ensuring that the fluid is not negatively affected by shearing, vibration, etc., thus guaranteeing the quality and stability of the liquid. For conveying corrosive environments or high-temperature fluids, this design also maintains good performance and durability, making it suitable for more demanding industrial applications.

[0038] The optimized annular groove flow channel 11 design has a wide range of applications, suitable for various industries and fluid types, especially for conveying high-viscosity, particulate, or sensitive liquids. It can efficiently handle not only traditional water-based liquids but also complex liquid media such as dairy products, chemical solutions, food and beverages, and pharmaceuticals. In fluid conveying systems requiring high precision and efficiency, it ensures that the fluid is not negatively affected by shearing, vibration, etc., guaranteeing the quality and stability of the liquid. For conveying corrosive environments or high-temperature fluids, this design also maintains good performance and durability, making it suitable for more demanding industrial applications.

[0039] The convex flow channel 10 enhances the momentum of the inlet fluid, reduces the pressure difference at the liquid inlet, reduces the pump's net positive suction head (NPSH), and increases the suction force at the pump inlet. This reduces the circumferential flow of the liquid in the pump chamber and forces viscous media to flow towards the outlet. By increasing the pressure, a high negative pressure suction state is formed at the inlet. At the same time, this design is durable and also has the advantages of being compact, lightweight, easy to clean, and energy-efficient.

[0040] Because the convex flow channel 10 design optimizes the pump's hydraulic performance and reduces internal liquid flow turbulence, it directly reduces wear on internal pump components, thereby improving the pump's durability and service life. It also reduces problems such as cavitation, pressure fluctuations, and liquid turbulence, allowing the pump to maintain stable performance under prolonged high-load operation, reducing failure rates and maintenance needs. For applications operating under high loads or continuous operation (such as dairy processing, pharmaceuticals, and chemicals), reducing downtime and maintenance costs is crucial; extending equipment life is key to improving production efficiency and reducing total cost of ownership.

[0041] Furthermore, this design effectively reduces noise and vibration, minimizing the mechanical burden on the pump and environmental noise during operation, thus contributing to a quieter and more comfortable working environment. In addition, the low-noise and low-vibration operation extends the service life of the pump and related equipment, reducing maintenance costs and downtime.

[0042] Meanwhile, the pump body rear cover plate 3 is provided with several pump body fixing holes 15, and bolts are provided inside the several pump body fixing holes 15. The pump body rear cover plate 3 and the pump shell 4 are fixedly connected by bolts, which facilitates the fixing of the pump body rear cover plate 3 and the pump shell 4 to form a sealed space.

[0043] More importantly, the pump body rear cover plate 3 has a spring seat fixing threaded hole 12, and the mechanical seal spring seat 13 is threadedly connected to the pump body rear cover plate 3 by screws, which facilitates the fixing of the mechanical seal spring seat 13 to the pump body rear cover plate 3.

[0044] In addition, a pump bracket fixing threaded hole 14 is provided on the rear cover plate 3 of the pump body. The pump bracket fixing threaded hole 14 can be fixed to the pump bracket body 2 by bolts, which facilitates the fixing of the pump bracket fixing threaded hole 14 to the pump bracket body 2.

[0045] The output end of motor 1 passes through the pump bracket body 2 and is inserted into the shaft hole 6. The output end of motor 1 is fixedly connected to the open impeller 5. Motor 1 drives the open impeller 5 to rotate, and the water flow will enter the optimized annular groove flow channel 11 under the action of the open impeller 5.

[0046] When the operator needs to fix the pump body rear cover plate 3 to the motor 1, the mechanical seal spring seat 13 is fixed to the pump body rear cover plate 3 with screws. Then, the inner sealing plate is fixed to the pump bracket body 2 with bolts. Next, the open impeller 5 is installed on the output end of the motor 1. Finally, the pump casing 4 is fixed to the inner sealing plate with bolts.

[0047] When in use, the motor 1 is turned on, and the motor 1 drives the open impeller 5 to rotate. The water flows into the pump casing 4 from the inlet and rotates in the open impeller 5. Then it enters the convex flow channel 10 and is discharged from the outlet through the optimized annular groove flow channel 11.

[0048] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A centrifugal pump, characterized in that, include: Motor (1), a pump bracket body (2) is fixed on one side of the motor (1), a sealing plate is provided on the side of the pump bracket body (2) away from the motor (1), and a pump shell (4) is provided on the side of the sealing plate away from the pump bracket body (2); The sealing plate includes a pump body rear cover plate (3), on which a mechanical seal cleaning chamber (8) is opened, and a shaft hole (6) is opened on the pump body rear cover plate (3) at the position of the mechanical seal cleaning chamber (8). A mechanical seal spring seat (13) is provided on one side of the pump body rear cover plate (3), and a pump body sealing groove (9) is opened on the pump body rear cover plate (3). A baffle plate (7) is fixed on the pump body rear cover plate (3).

2. A centrifugal pump as described in claim 1, characterized in that: The pump casing (4) is provided with an inlet and an outlet.

3. A centrifugal pump as described in claim 1, characterized in that: The pump body rear cover plate (3) is provided with an optimized annular groove flow channel (11), the inner wall of the optimized annular groove flow channel (11) is arc-shaped, and the baffle plate (7) is provided with a convex flow channel (10).

4. A centrifugal pump as described in claim 1, characterized in that: The pump body rear cover plate (3) is provided with a plurality of pump body fixing holes (15), and bolts are provided inside the plurality of pump body fixing holes (15). The pump body rear cover plate (3) and the pump shell (4) are fixedly connected by bolts.

5. A centrifugal pump as described in claim 1, characterized in that: The pump body rear cover plate (3) is provided with a spring seat fixing threaded hole (12), and the mechanical seal spring seat (13) is threadedly connected to the pump body rear cover plate (3) by screws.

6. A centrifugal pump as described in claim 1, characterized in that: The pump body rear cover plate (3) is provided with a pump bracket fixing threaded hole (14), which can be fixed to the pump bracket body (2) by bolts.

7. A centrifugal pump as described in claim 1, characterized in that: The output end of the motor (1) passes through the pump bracket body (2) and is inserted into the shaft hole (6). The output end of the motor (1) is fixedly connected to the open impeller (5).

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