Horizontal multi-stage centrifugal pump with cooling structure

Abstract

The utility model discloses a horizontal multi-stage centrifugal pump with a cooling structure, which relates to the field of end shaft cooling of horizontal centrifugal pumps and comprises a pump shell, a plurality of pump cavities are formed in the pump shell, the output end of one pump cavity at one end is connected with a water outlet pipe, and the input end of the other pump cavity at the other end is connected with a water inlet pipe. Impellers are arranged in the pump cavity located in the middle, the multiple impellers are coaxially connected through a rotating shaft, end covers are installed at the two ends of the rotating shaft, and the two ends of the rotating shaft and the inner walls of the end covers are rotationally installed through bearings. According to the centrifugal pump, through the design of the cooling mechanism, heat generated by friction can be exchanged and taken away in the process of pumping a water body, so that the problem of aging of the sealing mechanism caused by overhigh temperature in the operation process of the centrifugal pump is avoided, and the service life of the sealing mechanism is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of end shaft cooling of horizontal centrifugal pumps, specifically a horizontal multistage centrifugal pump with a cooling structure. Background Technology

[0002] A horizontal multistage centrifugal pump has a horizontally mounted pump casing and multiple impellers coaxially connected within its pump chamber.

[0003] When a multistage centrifugal pump is running, the moving and stationary parts of the sealing mechanism installed at both ends of the rotating shaft come into contact and rub against each other during operation. During long-term operation of the multistage centrifugal pump, the temperature is prone to become too high, which can cause the sealing mechanism to age at excessively high temperatures, thus affecting its service life. Utility Model Content

[0004] The purpose of this utility model is to provide a horizontal multistage centrifugal pump with a cooling structure in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a horizontal multistage centrifugal pump with a cooling structure, comprising a pump casing, wherein the pump casing is formed with multiple pump chambers, an outlet pipe is connected to the output end of one of the pump chambers located at one end, an inlet pipe is connected to the input end of another pump chamber located at the other end, an impeller is disposed in the pump chamber located in the middle, the multiple impellers are coaxially connected by a rotating shaft, end caps are installed at both ends of the rotating shaft, the two ends of the rotating shaft are rotatably mounted to the inner wall of the end caps by bearings, a sealing mechanism connected to the rotating shaft is installed on the inner wall of the end caps, and a cooling mechanism for cooling the sealing mechanism is distributed inside the end caps and the pump casing.

[0006] As a further embodiment of this utility model: the sealing mechanism includes a dynamic sealing ring coaxially fixedly installed at the end of the outer wall of the rotating shaft;

[0007] The sealing mechanism further includes a fixing ring fixedly installed on the inner wall of the end cap. A guide shaft is slidably installed inside the fixing ring. A static sealing ring is fixedly installed at one end of the guide shaft near the dynamic sealing ring. A spring that is sleeved on the guide shaft is fixedly connected between the fixing ring and the static sealing ring.

[0008] As a further embodiment of this utility model: the cooling mechanism includes a water cavity formed in the inner wall of the cylindrical part of the end cover, and two through holes connected to the water cavity are formed on the end plate of the pump casing.

[0009] As a further embodiment of this utility model: the outer wall of the cylindrical part of the end cover is integrally formed with an outwardly protruding limiting block, the inner wall of the pump housing end into which the end cover is inserted is provided with a limiting groove that matches the limiting block, and a rubber sealing ring is installed at the contact position between the end plate part of the end cover and the pump housing.

[0010] As a further embodiment of this utility model: the impeller has an inlet with a diameter larger than the rotating shaft on the protective plate near the water inlet pipe, and the impeller blades have an outlet, which is connected to the inner cavity of the pump chamber.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. By setting up a cooling mechanism, the design of the cooling mechanism can achieve heat exchange during the pumping of water, and remove the heat generated by friction, thereby avoiding the aging problem of the sealing mechanism due to excessive temperature during the operation of the centrifugal pump and extending the service life of the sealing mechanism. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0015] Figure 3 For the present utility model Figure 2 Enlarged view of a portion of point A in the middle;

[0016] Figure 4 This is a schematic diagram of the sealing mechanism of this utility model;

[0017] Figure 5 This is a schematic diagram of the installation of the limiting plug of this utility model.

[0018] In the diagram: 1. Pump casing; 2. Inlet pipe; 3. Outlet pipe; 4. Pump chamber; 5. Impeller; 6. Inlet; 7. Outlet; 8. End cover; 9. Through hole; 10. Water chamber; 11. Rotating shaft; 12. Dynamic sealing ring; 13. Static sealing ring; 14. Fixed ring; 15. Guide shaft; 16. Bearing; 17. Spring; 18. Limiting block. Detailed Implementation

[0019] 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.

[0020] Please see Figures 1-5 In this embodiment of the present invention, a horizontal multistage centrifugal pump with a cooling structure includes a pump casing 1, which is formed with multiple pump chambers 4. The output end of one pump chamber 4 located at one end is connected to a water outlet pipe 3, and the input end of another pump chamber 4 located at the other end is connected to a water inlet pipe 2. An impeller 5 is arranged in the pump chamber 4 located in the middle position. Multiple impellers 5 are coaxially connected by a rotating shaft 11. End caps 8 are installed at both ends of the rotating shaft 11. The two ends of the rotating shaft 11 are rotatably installed with the inner wall of the end cap 8 through bearings 16. A sealing mechanism connected to the rotating shaft 11 is installed on the inner wall of the end cap 8. Cooling mechanisms for cooling the sealing mechanism are distributed inside the end cap 8 and the pump casing 1. An inlet 6 with a diameter larger than the rotating shaft 11 is opened on the protective plate of the impeller 5 near the water inlet pipe 2. An outlet 7 is provided between the blades of the impeller 5. The outlet 7 is connected to the inner cavity of the pump chamber 4.

[0021] In this embodiment: First, the motor connected to the rotating shaft 11 is started. The output shaft of the motor drives the rotating shaft 11 to rotate through the coupling. The rotating shaft 11 drives multiple impellers 5 to rotate in the corresponding pump chambers 4. The rotation of the impellers 5 generates suction to draw water from the inlet pipe 2 into the pump chamber 4. The water passes through the inlet 6 under negative pressure and enters the outlet 7 through the inlet 6. Finally, it is discharged from the outlet 7 into the pump chamber 4, and is pushed step by step. Finally, it is discharged outward from the outlet pipe 3.

[0022] During the above process, the sealing mechanism can prevent water from flowing out from both ends of the rotating shaft 11, ensuring the sealing effect. In addition, as the water flows in the pump chamber 4, it enters the cooling mechanism to dissipate heat from the sealing mechanism, preventing the two parts of the sealing mechanism from overheating due to friction, and ensuring the service life of the sealing mechanism.

[0023] Please refer to this carefully. Figure 3 and Figure 4 The sealing mechanism includes a dynamic sealing ring 12 coaxially fixedly installed on the outer end of the rotating shaft 11; the sealing mechanism also includes a fixed ring 14 fixedly installed on the inner wall of the end cover 8, a guide shaft 15 is slidably installed inside the fixed ring 14, a static sealing ring 13 is fixedly installed at one end of the guide shaft 15 near the dynamic sealing ring 12, and a spring 17 sleeved on the guide shaft 15 is fixedly connected between the fixed ring 14 and the static sealing ring 13.

[0024] In this embodiment: when the rotating shaft 11 rotates, the rotating shaft 11 drives the dynamic sealing ring 12 to rotate. At this time, the static sealing ring 13, which is in contact with the dynamic sealing ring 12, remains stationary. The spring 17 is in a compressed state, which can always provide pressure to the static sealing ring 13, so that the static sealing ring 13 and the dynamic sealing ring 12 are always kept in a tight fit, thereby ensuring the sealing of both ends of the rotating shaft 11.

[0025] Please refer to this carefully. Figure 3 and Figure 4 The cooling mechanism includes a water cavity 10 opened on the inner wall of the cylindrical part of the end cover 8, and two through holes 9 connected to the water cavity 10 are opened on the end plate of the pump housing 1.

[0026] In this embodiment: after the water enters the pump chamber 4, some of the water enters the water chamber 10 through the through hole 9. At this time, the water exchanges heat with the inner wall of the cylindrical part of the end cover 8, thereby avoiding the aging phenomenon caused by friction overheating between the dynamic sealing ring 12 and the static sealing ring 13, and extending the service life of the sealing mechanism.

[0027] Please refer to this carefully. Figure 5 The cylindrical outer wall of the end cover 8 is integrally formed with an outwardly protruding limiting insert 18. The inner wall of the pump housing 1 at the end into which the end cover 8 is inserted is provided with a limiting groove that matches the limiting insert 18. A rubber sealing ring is installed at the contact position between the end plate of the end cover 8 and the pump housing 1.

[0028] In this embodiment: when installing the end cover 8, the end cover 8 drives the limiting plug 18 to align with the limiting groove and insert it. Then, bolts and nuts are used to fix the end cover 8. At this time, the rubber sealing ring is deformed under pressure and completely fills the gap.

[0029] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A horizontal multi-stage centrifugal pump having a cooling structure, comprising a pump casing (1), characterized in that, The pump housing (1) is formed with multiple pump cavities (4), the output end of one of the pump cavities (4) at one end is connected with a water outlet pipe (3), the input end of another of the pump cavities (4) at the other end is connected with a water inlet pipe (2), the pump cavities (4) at the middle position are provided with impellers (5), the multiple impellers (5) are coaxially connected through rotating shafts (11), the two ends of the rotating shafts (11) are installed with end covers (8), the two ends of the rotating shafts (11) and the inner walls of the end covers (8) are rotatably installed through bearings (16), the inner walls of the end covers (8) are installed with sealing mechanisms connected with the rotating shafts (11), the end covers (8) and the inner part of the pump housing (1) are distributed with cooling mechanisms for cooling the sealing mechanisms.

2. The horizontal multi-stage centrifugal pump with a cooling structure according to claim 1, characterized in that, The sealing mechanism comprises a dynamic sealing ring (12) coaxially and fixedly installed at the end of the outer wall of the rotating shaft (11); The sealing mechanism further comprises a fixed ring (14) fixedly installed at the inner wall of the end cover (8), the inside of the fixed ring (14) is slidably installed with a guide shaft (15), one end of the guide shaft (15) close to the dynamic sealing ring (12) is fixedly installed with a static sealing ring (13), the fixed ring (14) and the static sealing ring (13) are fixedly connected with a spring (17) sleeved with the guide shaft (15).

3. The horizontal multi-stage centrifugal pump with a cooling structure according to claim 2, characterized in that, The cooling mechanism comprises a water cavity (10) opened at the inner wall of the cylindrical part of the end cover (8), the end plate of the pump housing (1) is opened with two through holes (9) in communication with the water cavity (10).

4. The horizontal multi-stage centrifugal pump with a cooling structure according to claim 3, characterized in that, The cylindrical part of the end cover (8) is integrally formed with a limit plug (18) protruding outward, the inner wall of the end part of the pump housing (1) for inserting the end cover (8) is opened with a limit slot matched with the limit plug (18), the end plate part of the end cover (8) is installed with a rubber sealing ring at the position in contact with the pump housing (1).

5. The horizontal multi-stage centrifugal pump with a cooling structure according to claim 4, characterized in that, The protective plate of the impeller (5) close to the water inlet pipe (2) is opened with an inlet (6) with a diameter larger than the rotating shaft (11), the blade part of the impeller (5) has a discharge port (7), the discharge port (7) is in communication with the inner cavity of the pump cavity (4).

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