Bearing cooling device for multistage centrifugal pump

Abstract

The invention relates to a cooling device for a multi-stage centrifugal pump bearing. The cooling device comprises a bearing, a pump shaft, a bearing body, a cooling coil and a bearing body lower cover plate. The pump shaft is arranged in the center of the bearing body, the lower portion of the bearing body is designed to be of an open structure, and the lower portion of the bearing body, the cooling coil and the bearing body lower cover plate form a closed oil chamber. The cooling coil is located in the closed oil chamber, the two ends of the cooling coil are a cooling liquid inlet and a cooling liquid outlet respectively, and the two ends of the cooling coil penetrate through the bearing body lower cover plate. By adopting the design of the open-type bearing body and the cooling coil pipe, the structure is simple, and the installation and the maintenance are also very convenient. Meanwhile, the structure can be designed into a series of bearing devices according to bearings of different specifications; and the cooling effect is obvious in high-temperature medium application occasions where cold water is provided. The design structure is simple, manufacturing, installation and use are convenient, and popularization is easy.

Description

Technical Field

[0001] The invention relates to a cooling device, in particular to a cooling device for multi-stage centrifugal pump bearings which adopts an open bearing body and a cooling coil design and has a simple structure, is easy to manufacture and has a good cooling effect. Background Art

[0002] There are many different types of bearing cooling devices used in multi-stage centrifugal pumps, including water jacket cooling, fan cooling, and fin cooling. Water jacket cooling requires a water cooling cavity within the bearing body, which complicates the bearing structure, increases manufacturing difficulty, and imposes stringent requirements on sealing performance. Furthermore, if the water cooling cavity is too small, the bearing cooling effect is ineffective. If the water cooling cavity is too large, the entire bearing body becomes larger, resulting in unnecessary waste.

[0003] Fan cooling is greatly affected by environmental conditions, which leads to unstable cooling effect and affects the cooling effect of bearings.

[0004] Fin cooling reduces bearing temperature by inserting finned tubes into the bearing cavity and connecting them to external cooling water. However, due to structural design issues, traditional fin-type oil cooling has low heat dissipation efficiency. This can be ineffective in reducing bearing temperature, especially after long periods of operation. This can lead to uncontrolled lubricating oil temperature, affecting lubrication and reducing bearing performance. Fin cooling also requires regular maintenance, resulting in high maintenance costs.

[0005] Existing bearing cooling devices mainly rely on water-cooled jackets, fans, fins, etc. These cooling devices are either relatively complex in structure and inconvenient for subsequent maintenance, or have unsatisfactory cooling effects, affecting the overall performance of the bearings and, consequently, the stable operation of the unit. Summary of the Invention

[0006] In view of the above problems, the main purpose of the present invention is to provide a multi-stage centrifugal pump bearing cooling device which adopts an open bearing body and a cooling coil design, has a simple structure, is easy to manufacture, and has a good cooling effect.

[0007] The present invention solves the above technical problems through the following technical solutions: a bearing cooling device for a multi-stage centrifugal pump, the bearing cooling device for a multi-stage centrifugal pump comprising a bearing, a pump shaft, a bearing body, a cooling coil, and a bearing body lower cover; the pump shaft is arranged at the center of the bearing body, the lower part of the bearing body is designed as an open structure, and forms a closed oil chamber with the cooling coil and the bearing body lower cover; the cooling coil is located in the closed oil chamber, and the two ends of the cooling coil are respectively a coolant inlet and a coolant outlet, and the two ends of the cooling coil pass through the bearing body lower cover.

[0008] In a specific implementation example of the present invention, both ends of the cooling coil are provided with positioning joints and compression joints. The positioning joints are positioned in positioning holes provided on the lower cover plate of the bearing body and are tightened to the lower cover plate of the bearing body with nuts. The coolant inlet and the coolant outlet are connected to the coolant inlet pipe and the coolant outlet pipe using compression joints.

[0009] In a specific implementation example of the present invention, the lower cover plate of the bearing body is fastened to the bearing body by bolts.

[0010] In a specific embodiment of the present invention, the lower cover plate of the bearing body serves as a water-cooling cavity with a cold water pressure boundary, and cooling water can flow through the cooling coil to take away the heat in the closed oil chamber.

[0011] In a specific embodiment of the present invention, a sealing gasket or sealant is used between the lower cover plate of the bearing body and the bearing body for sealing.

[0012] The positive progress effect of the present invention is that the bearing cooling device for a multi-stage centrifugal pump provided by the present invention adopts an open bearing body plus cooling coil design, which is not only simple in structure but also convenient in installation and maintenance.

[0013] At the same time, the structure can be designed into a series of bearing devices according to bearings of different specifications; in applications where high-temperature media are provided with cooling water, the cooling effect is obvious. The design structure is simple, easy to manufacture, install, use, and easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention (after assembly).

[0015] Figure 2 for Figure 1 Left sectional view of .

[0016] The following are the names corresponding to the labels in the present invention:

[0017] Bearing 10, pump shaft 20, bearing body 30, cooling coil 40, bearing body lower cover 50, nut 60, coolant inlet pipe 70, coolant outlet pipe 80, bolt 90, positioning joint 401, compression joint 402, coolant inlet 403, coolant outlet 404, positioning hole 501. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention are given below in conjunction with the accompanying drawings to illustrate the technical solutions of the present invention in detail.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention (after assembly), Figure 2 for Figure 1The left sectional view is shown in the above figure: The present invention provides a multi-stage centrifugal pump bearing cooling device, which includes: a bearing 10, a pump shaft 20, a bearing body 30, a cooling coil 40, and a bearing body lower cover 50; the pump shaft 20 is arranged at the center of the bearing body 30, and the lower part of the bearing body 30 is designed to be an open structure, forming a closed oil chamber with the cooling coil 40 and the bearing body lower cover 50; the cooling coil 40 is located in the closed oil chamber, and the two ends of the cooling coil 40 are respectively a coolant inlet 403 and a coolant outlet 404, and the two ends of the cooling coil 40 pass through the bearing body lower cover 50.

[0020] The cooling coil 40 of the present invention has a positioning joint 401 and a compression joint 402 at both ends. The positioning joint is positioned in the positioning hole 501 set on the lower cover plate 50 of the bearing body and is tightened to the lower cover plate 50 of the bearing body with a nut 60. The coolant inlet and the coolant outlet are connected to the coolant inlet pipe 70 and the coolant outlet pipe 80 using a compression joint 402.

[0021] In a specific implementation of the present invention, the bearing body lower cover plate 50 is fastened to the bearing body 30 by bolts 90 .

[0022] The lower cover plate 50 of the bearing body of the present invention serves as a water-cooling cavity with a cold water pressure-bearing boundary. Cooling water can flow through the cooling coil 40 to remove heat from the closed oil chamber.

[0023] In the present invention, a sealing gasket or sealant is used between the bearing body lower cover plate 50 and the bearing body 30 for sealing.

[0024] The open structure of the bearing body 30 in the present invention is not only convenient for designing into an oil chamber, but also convenient for later casting. The lower cover plate 50 of the bearing body is fastened to the bearing body 30 by bolts. As a water-cooled cavity with a cold water pressure-bearing boundary; the lower end of the bearing body lower cover plate 50 is the water inlet and outlet interface of the cooling coil 40; the cooling water can flow through the coil, effectively taking away the heat in the oil pool. The cooling coil serves as a pressure-bearing boundary, which is more conducive to detection and manufacturing than a closed cooling cavity, and the quality is more guaranteed. The heat exchange area between the cooling coil 40 and the lubricating oil depends on the number of coil turns, which is flexible and changeable, and the larger contact area directly cools the hot oil near the oil ring in the oil chamber, and the bearing cooling effect is excellent.

[0025] The basic principles, main features and advantages of the present invention are shown and described above. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention, which is defined by the appended claims and their equivalents.

Claims

1. A bearing cooling device for a multi-stage centrifugal pump, characterized in that: The bearing cooling device for a multi-stage centrifugal pump includes a bearing, a pump shaft, a bearing body, a cooling coil, and a lower cover plate of the bearing body; the pump shaft is arranged at the center of the bearing body, and the lower part of the bearing body is designed as an open structure, forming a closed oil chamber with the cooling coil and the lower cover plate of the bearing body; the cooling coil is located in the closed oil chamber, and the two ends of the cooling coil are respectively a coolant inlet and a coolant outlet, and the two ends of the cooling coil pass through the lower cover plate of the bearing body.

2. The multi-stage centrifugal pump bearing cooling device according to claim 1, characterized in that: Both ends of the cooling coil are equipped with positioning joints and compression fittings. The positioning joints are positioned in the positioning holes provided on the lower cover plate of the bearing body and are tightened to the lower cover plate of the bearing body with nuts. The coolant inlet and coolant outlet are connected to the coolant inlet pipe and the coolant outlet pipe using compression fittings.

3. The multi-stage centrifugal pump bearing cooling device according to claim 1, characterized in that: The lower cover plate of the bearing body is fastened to the bearing body by bolts.

4. The multi-stage centrifugal pump bearing cooling device according to claim 1, characterized in that: The lower cover plate of the bearing body serves as a water-cooling cavity with a cold water pressure boundary. Cooling water can flow through the cooling coil to take away the heat in the closed oil chamber.

5. The multi-stage centrifugal pump bearing cooling device according to claim 1, characterized in that: A sealing gasket or sealant is used between the lower cover plate of the bearing body and the bearing body for sealing.

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