Horizontal centrifugal pump

Abstract

The utility model discloses a horizontal centrifugal pump which comprises a base, a motor and a pump body. A middle bearing seat is installed on the side, close to the motor, of the pump body. A motor shaft of the motor penetrates through the middle bearing seat. A mechanical seal is arranged on the motor shaft; the side, facing the motor, of the middle of the middle bearing seat protrudes to form a circular-truncated-cone-shaped protruding part, the side, away from the motor, of the middle bearing seat is provided with a sealing cover plate, the periphery of the sealing cover plate is fixed to the middle bearing seat, a penetrating hole is formed in the middle of the sealing cover plate, and the sealing cover plate is arranged on the motor shaft in a sleeving mode through the penetrating hole. A sealing cavity is defined by the sealing cover plate and the circular-truncated-cone-shaped protruding part of the middle bearing seat, and the mechanical seal is located in the sealing cavity. A liquid injection hole communicated with the sealing cavity is formed in the circular-truncated-cone-shaped protruding part of the middle bearing seat. According to the horizontal centrifugal pump, liquid media pumped by the centrifugal pump cannot make contact with the mechanical seal, and therefore the adverse effect of impurities such as particulate matter in the liquid media on the sealing effect of the mechanical seal is reduced.

Description

A horizontal centrifugal pump Technical Field

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

[0002] In modern industrial production and fluid transportation, centrifugal pumps are widely used in petrochemical, power, water supply and drainage, and many other industries due to their advantages such as simple structure, reliable operation, and large flow rate. Among existing technologies, mechanical seals are a common sealing method; however, they are also one of the main vulnerable components of centrifugal pumps, with more than half of centrifugal pump failures caused by seal failure. Mechanical seals have a limited service life; when they wear out, the object they seal, such as liquid, will leak, causing significant losses, especially when unattended.

[0003] In existing centrifugal pumps, the mechanical seal and the pump chamber are interconnected, allowing the liquid medium pumped by the centrifugal pump to self-lubricate and cool the mechanical seal. However, when centrifugal pumps transport water, the water source is often unfiltered, containing particles and other impurities. When the water flows through the mechanical seal structure, these particles may enter the interior of the mechanical seal, causing wear on the sealing surface. Furthermore, these impurities can adhere to the inner wall of the mechanical seal structure, making them difficult to clean. Prolonged retention can lead to corrosion, easily damaging the sealing structure and affecting the sealing effect. Summary of the Invention

[0004] The purpose of this utility model is to provide a horizontal centrifugal pump that isolates the mechanical seal from the pump body by adding a sealing cover plate on the intermediate bearing, so that the liquid medium pumped by the centrifugal pump will not come into contact with the mechanical seal, thereby reducing the adverse effects of particulate matter and other impurities in the liquid medium on the sealing effect of the mechanical seal.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] This utility model provides a horizontal centrifugal pump, including a base, a motor mounted on the base, and a pump body fixed to the motor; the pump body has an inlet and an outlet, an impeller is disposed within the pump body, and an intermediate bearing is mounted on the side of the pump body near the motor; the motor is mounted on the intermediate bearing via a connecting plate, and the motor shaft passes through the intermediate bearing, with the impeller mounted on the motor shaft; a mechanical seal is provided on the motor shaft, and the mechanical seal is located between the intermediate bearing and the impeller;

[0007] The central bearing has a truncated cone-shaped protrusion on the side facing the motor. A sealing cover is provided on the side of the central bearing away from the motor. The periphery of the sealing cover is fixed to the central bearing, and a through hole is provided in the center of the sealing cover, through which it is fitted onto the motor shaft. A sealing cavity is formed between the sealing cover and the central bearing, and the mechanical seal is located in the sealing cavity. A liquid injection hole communicating with the sealing cavity is provided on the truncated cone-shaped protrusion of the central bearing for injecting lubricating medium into the sealing cavity.

[0008] In some preferred embodiments of this utility model, the sealing cover plate is provided with a plurality of mounting holes along its circumference, and the mounting holes are provided with fixing members to fix the sealing cover plate to the periphery of the middle support.

[0009] In some preferred embodiments of this utility model, a first sealing groove is provided on the surface of the sealing cover plate that contacts the middle support, and a sealing ring is provided in the first sealing groove.

[0010] In some preferred embodiments of this utility model, a spiral groove or a stepped groove is formed on the wall surface of the perforation.

[0011] In some preferred embodiments of this utility model, a second sealing groove is provided on the wall surface of the perforation, and a sealing ring is provided in the second sealing groove.

[0012] In some preferred embodiments of this utility model, a disc spring is also sleeved on the motor shaft, and the disc spring is located between the mechanical seal and the sealing cover plate.

[0013] In some preferred embodiments of this utility model, a bushing is fitted on the outer side of the motor shaft.

[0014] In some preferred embodiments of this utility model, a shaft extension is fixedly connected to the motor shaft, the shaft extension passes downward through the intermediate bearing, and the impeller is mounted on the shaft extension.

[0015] Compared with the prior art, the present invention can achieve at least the following technical effects:

[0016] 1. The horizontal centrifugal pump provided by this utility model, by adding a sealing cover plate inside the existing centrifugal pump, isolates the mechanical seal from the inside of the pump body, so that the liquid medium pumped by the centrifugal pump will not come into contact with the mechanical seal, thereby reducing the adverse effects of particulate matter and other impurities in the liquid medium on the sealing effect of the mechanical seal.

[0017] 2. The horizontal centrifugal pump provided by this utility model allows lubricating medium to be injected into the sealing cavity through the injection hole on the intermediate bearing for lubrication of the mechanical seal. Additionally, when the centrifugal pump is operating at high speed and high temperature, cooling medium can be injected into the sealing cavity through the injection hole to cool the mechanical seal, thereby reducing friction and wear, lowering heat generation, and extending the service life of the mechanical seal.

[0018] 3. The horizontal centrifugal pump provided by this utility model improves the sealing effect by creating a sealing groove on the surface of the sealing cover plate in contact with the middle bearing and on the wall surface of the perforated sealing cover plate to embed a sealing ring, thereby preventing the pumped liquid medium from entering the sealing cavity. Attached Figure Description

[0019] The technical solution and other beneficial effects of this utility model will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0020] Figure 1 is a front view of the horizontal centrifugal pump of this utility model;

[0021] Figure 2 is a cross-sectional structural diagram of the horizontal centrifugal pump of this utility model;

[0022] Figure 3 is an enlarged view of point A in Figure 2;

[0023] Explanation of reference numerals in the attached figures:

[0024] 100, Base; 200, Motor; 210, Motor Shaft; 220, Shaft Sleeve; 230, Shaft Extension; 231, Keyway; 300, Connecting Plate; 400, Pump Body; 410, Volute; 411, Inlet; 412, Outlet; 420, Impeller; 500, Central Bearing; 510, Frustum-shaped Protrusion; 511, Injection Hole; 520, Sealing Cavity; 600, Sealing Cover; 610, First Sealing Groove; 620, Second Sealing Groove; 630, Third Sealing Groove; 640, Stepped Groove; 650, Sealing Ring; 700, Mechanical Seal; 800, Disc Spring. Detailed Implementation

[0025] To make the objectives, technical solutions, and beneficial effects of this application clearer, the following detailed description, in conjunction with the accompanying drawings and specific embodiments, further illustrates this application. It should be understood that the specific embodiments described in this specification are merely for explaining this application and are not intended to limit it.

[0026] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0028] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] As described in the background section, in existing centrifugal pumps, the mechanical seal and the pump chamber are interconnected, allowing the mechanical seal to be self-lubricated and cooled by the liquid medium pumped by the centrifugal pump. However, when centrifugal pumps transport water, the water source is often unfiltered, containing particles and other impurities. When the water flows through the mechanical seal structure, these particles enter the interior of the mechanical seal under water pressure, causing wear on the sealing surface and reducing the sealing effect. Furthermore, these impurities also adhere to the inner wall of the mechanical seal structure, making them difficult to clean. Prolonged retention can lead to corrosion, easily damaging the sealing structure and affecting the sealing performance.

[0030] To address the aforementioned technical problems, this application provides a horizontal centrifugal pump. By adding a sealing cover plate 600 inside the existing centrifugal pump, the mechanical seal 700 is isolated from the inside of the pump body 400, so that the liquid medium pumped by the centrifugal pump will not come into contact with the mechanical seal 700, thereby reducing the adverse effects of particulate matter and other impurities in the liquid medium on the sealing effect of the mechanical seal 700.

[0031] Specifically, please refer to Figure 1. This invention provides a horizontal centrifugal pump, including a base 100, a motor 200 mounted on the base 100, and a pump body 400 fixed on the motor 200. The motor 200 is horizontally mounted on the base 100. To ensure stability during operation, the base 100 preferably has a large contact area with the bottom surface.

[0032] Please refer to Figure 2. The pump body 400 includes a volute 410, on which an inlet 411 and an outlet 412 are provided. The interior of the volute 410 has a flow channel connecting the inlet 411 and the outlet 412. An impeller 420 is also provided inside the volute 410.

[0033] A connecting plate 300 is installed on the side of the motor 200 near the pump body 400. A middle bearing 500 is mounted on the connecting plate 300, and the pump body 400 is fixed to the middle bearing 500 by screws or other connecting components. The motor shaft 210 of the motor 200 passes through the middle bearing 500 and enters the inner cavity of the pump body 400, and the impeller 420 is mounted on the motor shaft 210. A mechanical seal 700 is provided on the motor shaft 210, which is located between the middle bearing 500 and the impeller 420. In some preferred embodiments, a bushing 220 is fitted on the outer side of the motor shaft 210 to protect the motor shaft 210.

[0034] In some preferred embodiments, a shaft extension 230 is fixedly connected to the motor shaft 210, the shaft extension 230 passes through the intermediate bearing 500, and the impeller 420 is mounted on the shaft extension 230. Further, a keyway 231 is provided on the surface of the shaft extension 230, and the impeller 420 is fixed to the shaft extension 230 by a key connection.

[0035] In this invention, the middle portion of the bearing 500 protrudes towards the side where the motor 200 is located, forming a frustum-shaped protrusion 510. A sealing cover 600 is provided on the side of the bearing 500 opposite to the frustum-shaped protrusion 510, thus forming a sealing cavity 520 between the sealing cover 600 and the frustum-shaped protrusion 510 in the middle of the bearing 500, and the mechanical seal 700 is located in the sealing cavity 520. Furthermore, the periphery of the sealing cover 600 is fixed to the bearing 500, and a through hole is provided in the middle of the sealing cover 600, through which the sealing cover 600 is fitted onto the motor shaft 210.

[0036] In this invention, based on the existing centrifugal pump, a sealing cover plate 600 is installed on the intermediate bearing 500 to isolate the mechanical seal 700 from the inner cavity of the pump body 400. This prevents the liquid medium pumped by the centrifugal pump from contacting the mechanical seal 700, thus reducing the adverse effects of particulate matter and other impurities in the liquid medium on the sealing effect of the mechanical seal 700. Furthermore, this invention does not require changes to the internal structure design of the centrifugal pump; only the addition of a sealing cover plate 600 is needed.

[0037] Please refer to Figures 2-3. Regarding the lubrication and cooling issues of the mechanical seal 700, this invention provides a liquid injection hole 511 on the frustum-shaped protrusion 510 of the intermediate bearing 500, which communicates with the sealing cavity 520. Lubricating medium can be injected into the sealing cavity 520 through this injection hole 511 for lubrication of the mechanical seal 700. Additionally, when the centrifugal pump is operating at high speed and high temperature, cooling medium can be injected into the sealing cavity 520 through the injection hole 511 to cool the mechanical seal 700, thereby reducing friction and wear, lowering heat generation, and extending the service life of the mechanical seal 700.

[0038] In this invention, the sealing cover plate 600 has multiple mounting holes along its circumference, and each mounting hole is equipped with a fixing component. The sealing cover plate 600 is fixedly installed on the periphery of the intermediate support 500 by the fixing component. The fixing component includes, but is not limited to, screws, bolts, etc.

[0039] Referring to Figure 3, since the liquid medium pumped in the inner cavity of the pump body 400 has a high pressure, in order to prevent the liquid medium from seeping into the sealing cavity 520, in some embodiments, a first sealing groove 610 is formed on the surface of the sealing cover plate 600 that contacts the intermediate support 500, and a sealing ring 650 is embedded in the first sealing groove 610. Preferably, there is a large contact area between the sealing cover plate 600 and the intermediate support 500, which makes the leakage path of the liquid longer, thus resulting in a better sealing effect. Furthermore, the circumferential surface of the sealing cover plate 600 abuts against the inner wall surface of the pump body 400, and a third sealing groove 630 is formed on the circumferential surface of the sealing cover plate 600, and a sealing ring 650 is embedded in the third sealing groove 630, which further improves the sealing effect.

[0040] Please refer to Figure 3. In this invention, a second sealing groove 620 is formed on the wall surface of the perforation in the sealing cover plate 600, and a sealing ring 650 is provided in the second sealing groove 620, thereby preventing liquid medium from seeping into the sealing cavity 520 through the perforation in the sealing cover plate 600. Further, in some preferred embodiments, a spiral groove or stepped groove 640 is formed on the wall surface of the perforation. During centrifugal pump operation, a gas film or liquid film is formed through the dynamic pressure effect of the fluid, keeping the sealing surface in a non-contact state, thereby reducing wear on the motor shaft 210.

[0041] Referring to Figure 3, in some embodiments, a disc spring 800 is further fitted onto the motor shaft 210, located between the mechanical seal 700 and the sealing cover plate 600. By providing this disc spring 800, the mechanical seal 700 and the sealing cover plate 600 can maintain elastic contact, which is beneficial for stabilizing the specific pressure of the sealing surface of the mechanical seal 700 and reducing leakage.

[0042] In summary, this utility model provides a horizontal centrifugal pump. By adding a sealing cover plate 600 inside the existing centrifugal pump, the mechanical seal 700 is isolated from the inside of the pump body 400, so that the liquid medium pumped by the centrifugal pump will not come into contact with the mechanical seal 700, thereby reducing the adverse effects of particulate matter and other impurities in the liquid medium on the sealing effect of the mechanical seal 700.

[0043] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. A horizontal centrifugal pump, characterized in that, The system includes a base, a motor mounted on the base, and a pump body fixed to the motor. The pump body has an inlet and an outlet, and an impeller is disposed within the pump body. A central bearing is mounted on the side of the pump body near the motor. The motor is mounted on the central bearing via a connecting plate, and the motor shaft passes through the central bearing. The impeller is mounted on the motor shaft. A mechanical seal is provided on the motor shaft, and the mechanical seal is located between the central bearing and the impeller. The middle portion of the central bearing faces the motor. One side of the machine has a raised, frustum-shaped protrusion. A sealing cover is provided on the side of the middle support away from the motor. The periphery of the sealing cover is fixed to the middle support, and a through hole is provided in the middle of the sealing cover, through which it is fitted onto the motor shaft. A sealing cavity is formed between the sealing cover and the frustum-shaped protrusion of the middle support, and the mechanical seal is located in the sealing cavity. A liquid injection hole communicating with the sealing cavity is provided on the frustum-shaped protrusion of the middle support for injecting lubricating medium into the sealing cavity.

2. A horizontal centrifugal pump according to claim 1, characterized in that, The sealing cover plate has multiple mounting holes along its circumference, and the mounting holes are provided with fasteners to fix the sealing cover plate to the periphery of the middle support.

3. A horizontal centrifugal pump according to claim 1, characterized in that, A first sealing groove is provided on the surface of the sealing cover plate that contacts the middle support, and a sealing ring is provided in the first sealing groove.

4. A horizontal centrifugal pump according to claim 1, characterized in that, A second sealing groove is provided on the wall surface of the perforation, and a sealing ring is provided in the second sealing groove.

5. A horizontal centrifugal pump according to claim 1, characterized in that, Spiral grooves or stepped grooves are formed on the wall surface of the perforation.

6. A horizontal centrifugal pump according to claim 1, characterized in that, A disc spring is also fitted on the motor shaft, and the disc spring is located between the mechanical seal and the sealing cover.

7. A horizontal centrifugal pump according to claim 1, characterized in that, A bushing is fitted on the outer side of the motor shaft.

8. A horizontal centrifugal pump according to claim 1, characterized in that, A shaft extension is fixedly connected to the motor shaft, the shaft extension passes downward through the intermediate bearing, and the impeller is mounted on the shaft extension.

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