Multi-stage centrifugal pump
By designing a structure that isolates the 360° cooling water chamber and the lubricating oil chamber in a multi-stage centrifugal pump, the problem of poor cooling effect of conventional centrifugal pumps is solved, and a more efficient pump shaft cooling effect is achieved.
Patent Information
- Application Number
- CN202422025110.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-21
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-08-21
AI Technical Summary
The cooling effect of conventional centrifugal pumps is not obvious and has a long axial length, making it difficult to effectively solve the problem of efficient cooling of the pump shaft.
A multi-stage centrifugal pump is designed, which is lubricated with dilute oil. A 360° cooling water chamber is set up at the periphery of the lubricating oil chamber and the bearing. The cooling water chamber is completely isolated from the lubricating oil chamber to prevent water from leaking into the oil chamber.
A 360° all-round cooling effect is achieved, which avoids the phenomenon of water inlet of bearings and significantly improves the cooling efficiency of the pump shaft.
Smart Images
Figure CN222910280U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of centrifugal pumps, and particularly relates to a multi-stage centrifugal pump. Background Technique
[0002] A multi-stage centrifugal pump is a pump that uses centrifugal force to transport liquid to a higher pressure. It usually consists of multiple centrifugal pump stages cascaded together, and each stage contains one or more impellers. When the liquid passes through each stage, the impeller accelerates it and transfers it to the next stage, ultimately enabling the liquid to reach the required high pressure. This type of pump is commonly used in industrial and construction applications where it is necessary to transport liquid to a far or high position.
[0003] However, conventionally, bearings adopt a thin oil lubrication structure, and an air-cooled structure with a fan added behind the bearing cover has an unclear cooling effect and a long axial length. In view of the above problems, the inventor proposes a multi-stage centrifugal pump to solve the above problems. Content of the Utility Model
[0004] In order to solve the problem of efficient cooling of centrifugal pumps; the purpose of the utility model is to provide a multi-stage centrifugal pump.
[0005] To solve the above technical problems, the utility model adopts the following technical scheme: a multi-stage centrifugal pump, including a body, a pump shaft is rotatably connected inside the body, a lubricating oil cavity is opened inside the body, a lubricating oil body is filled inside the lubricating oil cavity, one end of the pump shaft is in contact with the lubricating oil body, a first cooling water cavity is opened inside the pump shaft and on the outer side of the lubricating oil cavity and the pump shaft, a second cooling water cavity is opened on one side of the body close to the first cooling water cavity, and a third cooling water cavity is opened below the first cooling water cavity inside the body. The first cooling water cavity, the second cooling water cavity and the third cooling water cavity are internally communicated and surround the pump shaft at 360°, and cooling water is filled inside the first cooling water cavity, the second cooling water cavity and the third cooling water cavity. A skeleton seal is fixedly installed on one side of the body close to the lubricating oil cavity, and the skeleton seal is movably sleeved on the outer side of the pump shaft.
[0006] Preferably, a bearing is movably sleeved between the outer side of one end of the pump shaft and the inner side of the body, a bearing gland is fixedly installed on one side of the body close to the bearing, and the inner side of the bearing gland abuts against the bearing.
[0007] Preferably, a cooling water outlet is opened on one side of the body close to the second cooling water cavity, the cooling water outlet is internally communicated with the second cooling water cavity, a cooling water inlet is opened on the side of the body away from the cooling water outlet, and the cooling water inlet is internally communicated with the third cooling water cavity.
[0008] Preferably, an oil filling port is provided on one side of the machine body close to the cooling water outlet and between the first cooling water chamber and the cooling water outlet, and an oil drain port is provided on one side of the machine body close to the cooling water inlet. Both the oil filling port and the oil drain port communicate with the inside of the lubricating oil chamber.
[0009] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0010] The pump shaft is lubricated with thin oil. The first cooling water chamber is located outside the lubricating oil chamber and the bearing, so that the cooling water can completely surround the bearing 360°. The cavity formed by the first cooling water chamber, the second cooling water chamber and the third cooling water chamber is completely isolated from the lubricating oil chamber, and no sealing is required in the middle. Therefore, there is no need to worry about water leaking into the oil chamber and causing the bearing to get water. The cooling water enters from the bottom and exits from the top, achieving a good cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.
[0012] Figure 1 It is a schematic diagram of the overall structure of the present utility model.
[0013] Figure 2 It is a schematic diagram of the heat dissipation structure of the traditional centrifugal pump of the present utility model.
[0014] Figure 3 For the present utility model Figure 1 The enlarged view of part A.
[0015] In the figure: 1, machine body; 2, pump shaft; 3, lubricating oil chamber; 4, first cooling water chamber; 5, second cooling water chamber; 6, third cooling water chamber; 7, bearing; 8, bearing gland; 9, cooling water outlet; 10, cooling water inlet; 11, oil filling port; 12, oil drain port; 13, skeleton seal. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than 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 efforts shall fall within the protection scope of the present utility model.
[0017] Embodiment: As Figures 1 - 3As shown in the figure, the present utility model provides a multi-stage centrifugal pump, which includes a body 1. A pump shaft 2 is rotatably connected inside the body 1. An oil lubrication cavity 3 is provided inside the body 1, and the inside of the oil lubrication cavity 3 is filled with an oil lubricant. One end of the pump shaft 2 is in contact with the oil lubricant. A first cooling water cavity 4 is provided inside the pump shaft 2 and on the outside of the oil lubrication cavity 3 and the pump shaft 2. A second cooling water cavity 5 is provided on one side of the body 1 close to the first cooling water cavity 4. A third cooling water cavity 6 is provided below the first cooling water cavity 4 inside the body 1. The first cooling water cavity 4, the second cooling water cavity 5 and the third cooling water cavity 6 are internally connected and surround the pump shaft 2 at 360 degrees. The first cooling water cavity 4, the second cooling water cavity 5 and the third cooling water cavity 6 are filled with cooling water.
[0018] A bearing 7 is movably sleeved between the outer side of one end of the pump shaft 2 and the inner side of the body 1.
[0019] By adopting the above technical solution, by providing the bearing 7, it is convenient to better support the pump shaft 2, and at the same time reduce the friction between mechanical parts, thereby reducing the generation of noise.
[0020] A bearing gland 8 is fixedly installed on one side of the body 1 close to the bearing 7, and the inner side of the bearing gland 8 abuts against the bearing 7.
[0021] By adopting the above technical solution, by providing the bearing gland 8, it can effectively prevent external impurities, dust and liquid from entering the bearing, thereby protecting the bearing from pollution and damage. At the same time, it fixes and compresses the bearing to ensure that the bearing operates safely and stably in its designed position and prevent it from moving or loosening during operation.
[0022] A skeleton seal 13 is fixedly installed on one side of the body 1 close to the oil lubrication cavity 3, and the skeleton seal 13 is movably sleeved on the outside of the pump shaft 2.
[0023] By adopting the above technical solution, by providing the skeleton seal 13, it effectively prevents the leakage of liquid or gas in mechanical equipment.
[0024] A cooling water outlet 9 is provided on one side of the body 1 close to the second cooling water cavity 5, and the cooling water outlet 9 is internally connected to the second cooling water cavity 5. A cooling water inlet 10 is provided on the side of the body 1 away from the cooling water outlet 9, and the cooling water inlet 10 is internally connected to the third cooling water cavity 6.
[0025] By adopting the above technical solution, by providing the cooling water outlet 9, it is convenient to inject cooling water into the cavity formed by the first cooling water cavity 4, the second cooling water cavity 5 and the third cooling water cavity 6. The cooling water is used to absorb the heat generated when the pump shaft 2 rotates, and the cooling water flows out through the cooling water inlet 10 on one side of the third cooling water cavity 6, transporting the heat from the heat source to the cooling system, and so on, thereby realizing the cooling cycle.
[0026] On one side of the machine body 1 close to the cooling water outlet 9 and located between the first cooling water chamber 4 and the cooling water outlet 9, an oil filling port 11 is provided. On one side of the machine body 1 close to the cooling water inlet 10, an oil drain port 12 is provided. Both the oil filling port 11 and the oil drain port 12 communicate with the inside of the lubricating oil chamber 3.
[0027] By adopting the above technical solution, by providing the oil filling port 11, it is convenient to inject lubricating oil into the inside of the lubricating oil chamber 3. The lubricating oil absorbs the heat generated by the components and brings it into the cooling system, and releases the heat through the radiator to keep the moving components within an appropriate working temperature range and prevent overheating damage.
[0028] Working principle: As above Figure 1 As shown in the figure, the pump shaft 2 is lubricated with thin oil. The first cooling water chamber 4 is located outside the lubricating oil chamber 3 and the periphery of the bearing 7, so that the cooling water can completely surround the bearing 360°. It can be seen from the figure that the cavity formed by the first cooling water chamber 4, the second cooling water chamber 5 and the third cooling water chamber 6 is completely isolated from the lubricating oil chamber 3, and no sealing is required in the middle. Therefore, there is no need to worry about the phenomenon of water leaking into the oil chamber and causing the bearing to get water. The cooling water enters from the bottom and exits from the top to achieve a good cooling effect.
[0029] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.
Claims
1. A multistage centrifugal pump, comprising a body (1), characterized in that: The pump shaft (2) is rotatably connected inside the machine body (1), a lubricating oil chamber (3) is provided inside the machine body (1), the lubricating oil chamber (3) is filled with lubricating oil, one end of the pump shaft (2) is in contact with the lubricating oil, a cooling water chamber (4) is provided inside the pump shaft (2) and located outside the lubricating oil chamber (3) and the pump shaft (2), a cooling water chamber (2) is provided on the side of the machine body (1) close to the cooling water chamber (4), a cooling water chamber (3) is provided inside the machine body (1) and located below the cooling water chamber (4), the cooling water chamber (4), and the cooling water chamber (6) are connected to each other and surround the pump shaft (2) at 360 degrees, and the cooling water chamber (4), the cooling water chamber (5), and the cooling water chamber (6) are filled with cooling water.
2. A multistage centrifugal pump as claimed in claim 1, characterized in that: A bearing (7) is movably sleeved between the outer side of one end of the pump shaft (2) and the inner side of the machine body (1).
3. A multistage centrifugal pump as claimed in claim 2, characterized in that: A bearing cover (8) is fixedly mounted on one side of the machine body (1) close to the bearing (7), and the inner side of the bearing cover (8) is in contact with the bearing (7).
4. A multistage centrifugal pump as claimed in claim 1, characterized in that: A skeleton seal (13) is fixedly mounted on one side of the machine body (1) close to the lubricating oil chamber (3), and the skeleton seal (13) is movably sleeved on the outside of the pump shaft (2).
5. A multistage centrifugal pump as claimed in claim 1, characterized in that: A cooling water outlet (9) is provided on a side of the machine body (1) close to the second cooling water chamber (5), and the cooling water outlet (9) is communicated with the interior of the second cooling water chamber (5). A cooling water inlet (10) is provided on a side of the machine body (1) away from the cooling water outlet (9), and the cooling water inlet (10) is communicated with the interior of the third cooling water chamber (6).
6. A multistage centrifugal pump as claimed in claim 1, characterized in that: An oil filling port (11) is provided on one side of the machine body (1) close to the cooling water outlet (9) and between the cooling water chamber 1 (4) and the cooling water outlet (9), and an oil discharge port (12) is provided on one side of the machine body (1) close to the cooling water inlet (10), and both the oil filling port (11) and the oil discharge port (12) are in communication with the interior of the lubricating oil chamber (3).