A bearing bracket structure for a boiler feed pump
By designing a bearing bracket structure for boiler feedwater pumps, the problem of unstable mechanical properties of castings under high temperature and high pressure environments was solved, achieving a comprehensive effect of structural strength and cooling pressure relief, which is suitable for 3DG boiler feedwater pumps.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI KAIQUAN PUMP IND GROUP
- Filing Date
- 2025-06-26
- Publication Date
- 2026-07-14
AI Technical Summary
Existing castings have unstable mechanical properties under high temperature and high pressure environments, making it difficult to meet the requirements of 3DG boiler feedwater pumps. At the same time, forgings cannot be formed into complex geometries, making them unsuitable for high temperature and high pressure applications.
Design a bearing frame structure including a bearing frame body, a cover plate, an end frame, and reinforcing ribs. A sealed cavity is formed by welding, and cooling water holes and a pressure relief structure are provided on the bearing frame body to dissipate heat and relieve pressure using cooling water.
It achieves the ability to meet structural and strength requirements under high temperature and high pressure environments, while also having pressure relief and cooling functions, thus improving mechanical performance and sealing.
Smart Images
Figure CN224496859U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a bearing bracket structure, specifically a bearing bracket structure for boiler feedwater pumps that not only meets structural and strength requirements but also provides functions such as pressure relief and cooling. Background Technology
[0002] 3DG boiler feed pumps are mainly used for boiler feedwater in power plants, petrochemical plants, coal chemical plants and other systems, as well as for conveying high-temperature, high-pressure clean water or other liquids with physical and chemical properties similar to water. The medium being conveyed is characterized by high temperature and high pressure, so the mechanical and mechanical properties of the materials are required to be high.
[0003] In the machinery manufacturing industry, castings are the most widely used form of blank manufacturing, offering advantages such as high process flexibility, wide adaptability, low cost, and the ability to form blanks with complex shapes. However, due to the numerous and difficult-to-precise processes involved in casting, the quality of castings is not consistently stable. The loose structure and coarse grains resulting from liquid forming make castings prone to defects such as shrinkage cavities, porosity, and gas holes, leading to lower mechanical properties. These drawbacks limit their use to applications with less stringent mechanical performance requirements, making them unsuitable for the high-temperature, high-pressure applications of 3DG boiler feedwater pumps.
[0004] Compared to castings, forgings involve applying pressure to the metal billet during the forging process, resulting in a denser internal structure and significantly improved mechanical properties. Forgings typically exhibit superior strength, hardness, wear resistance, and tensile strength compared to castings, while also offering relatively higher dimensional accuracy and surface quality. However, the process of forging—using equipment such as forging hammers and presses to hammer or extrude metal billets, causing plastic deformation to obtain metal products of the desired shape and size—makes it impossible to achieve complex geometries. Utility Model Content
[0005] To address the aforementioned problems, the main objective of this utility model is to provide a bearing bracket structure for boiler feedwater pumps that not only meets structural and strength requirements but also serves functions such as pressure relief and cooling.
[0006] This utility model solves the above-mentioned technical problems through the following technical solution: a bearing bracket structure for a boiler feedwater pump, the bearing bracket structure for a boiler feedwater pump comprising: a bearing bracket body, a bearing bracket cover plate, a bearing bracket end frame, and a reinforcing rib plate, wherein the bearing bracket body and the bearing bracket cover plate are welded together; the bearing bracket end frame is welded together with the bearing bracket body; the reinforcing rib plate is welded together with the bearing bracket end frame and the bearing bracket body; after the bearing bracket body and the bearing bracket cover plate are welded together, a sealed cavity is formed between the two; the bearing bracket body is provided with a cooling water inlet hole and a cooling water outlet hole, the cooling water inlet hole and the cooling water outlet hole communicating with the outside world and the sealed cavity.
[0007] In a specific embodiment of this utility model, the reinforcing ribs include three pieces.
[0008] In a specific embodiment of this utility model, the bearing bracket end frame and the bearing bracket body are made of Q345B forgings, and the bearing bracket cover plate and the reinforcing rib plate are made of Q345B.
[0009] In a specific embodiment of this utility model, two cooling water inlet holes are machined at a 50° angle to the center line below the circumference of the bearing housing body, and two cooling water outlet holes are machined at a 50° angle to the center line above the circumference of the bearing housing body. The cooling water inlet holes and cooling water outlet holes connect the outside world with the sealed cavity Q.
[0010] In a specific embodiment of this utility model, several through holes are machined on the flange end face of the bearing housing body, an upper drainage hole is machined in the vertical direction, a threaded hole is machined on the left end face, the threaded hole is a blind hole, and an O-ring groove is machined on the right end face of the bearing housing body.
[0011] In a specific embodiment of this utility model, the lower part of the bearing bracket end frame is machined with a drain hole and an adjustment hole.
[0012] The positive and progressive effects of this utility model are as follows: the bearing bracket structure for boiler feed pumps provided by this utility model can not only meet the structural and strength requirements, but also play a role in pressure relief and cooling. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0014] Figure 2 for Figure 1 AA sectional view.
[0015] Figure 3 for Figure 2 Enlarged view of point M.
[0016] Figure 4 for Figure 2 Enlarged view of point N.
[0017] Figure 5 for Figure 2 Enlarged view of point P.
[0018] Figure 6 This is a structural diagram of a reinforcing rib.
[0019] Figure 7 This is a schematic diagram illustrating the working principle of this utility model.
[0020] The following are the names corresponding to the reference numerals in this utility model:
[0021] Figure 1-6 In the middle: 1-Bearing bracket body, 2-Bearing bracket cover plate, 3-Reinforcing rib plate 3, 4-Bearing bracket end frame, 5-Cooling water outlet hole, 6-Cooling water inlet hole, 7-Through hole, 8-Upper drain hole, 9-Threaded hole, 10-Drain hole, 11-Adjusting hole, 12-O-ring seal groove.
[0022] Figure 7 In the middle: 21-pump shaft, 22-bearing component, 23-sealing component, 24-O-ring seal, 25-bearing bracket, 26-first nut, 27-first stud, 28-pump body, 29-first O-ring seal, 30-second O-ring seal, 31-key, 32-shaft sleeve, 33-second nut, 34-second stud, 35-adjusting screw, 36-third nut, 37-third stud. Detailed Implementation
[0023] The preferred embodiments of this utility model are given below with reference to the accompanying drawings to illustrate the technical solution of this utility model in detail.
[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model. Figure 2 for Figure 1 AA section view, Figure 3 for Figure 2 Enlarged view at point M, Figure 4 for Figure 2 Enlarged view at point N, Figure 5 for Figure 2 The enlarged view at point P, as shown in the above figure, illustrates a bearing bracket structure for a boiler feedwater pump provided by this utility model. The bearing bracket structure includes: a bearing bracket body 1, a bearing bracket cover plate 2, a bearing bracket end frame 4, and reinforcing ribs 3. The bearing bracket body 1 is welded to the bearing bracket cover plate 2; the bearing bracket end frame 4 is welded to the bearing bracket body 1; and the reinforcing ribs 3 are welded to the bearing bracket end frame 4 and the bearing bracket body 1. After the bearing bracket body 1 and the bearing bracket cover plate 2 are welded together, a sealed cavity Q is formed between them. The bearing bracket body 1 is provided with a cooling water inlet hole 6 and a cooling water outlet hole 5, which connect the outside world to the sealed cavity Q. In specific implementation, this utility model includes three reinforcing ribs.
[0025] In this utility model, the bearing cage body and the bearing cage cover plate are welded together, and the weld type and size are shown in the view at "N"; the bearing cage end frame is welded together with the bearing cage body, and the weld type and size are shown in the view at "P"; the reinforcing rib plate is welded together with the bearing cage end frame and the bearing cage body, which can play a reinforcing role, and the reinforcing rib plate is as follows: Figure 3 As shown. The bearing bracket end frame and bearing bracket body are the main load-bearing parts, and their material is Q345B forging. The bearing bracket cover plate and reinforcing rib plate are also made of Q345B.
[0026] After the bearing housing body 1 and the bearing housing cover plate 2 are welded together, a sealed cavity is formed between them. Figure 1 At the "Q" mark, after welding, a 1.6MPa water pressure test is performed on the Q cavity for 15 minutes. No leaks or sweating are allowed to occur, thus checking the sealing performance of the Q cavity. Two cooling water inlets 6 are machined at a 50° angle to the centerline below the circumference of the bearing housing body, and two cooling water outlets 5 are machined at a 50° angle to the centerline above the circumference of the bearing housing body. The cooling water inlets 6 and outlets 5 connect the outside world to the sealed cavity Q. During pump operation, cooling water is introduced into the cavity Q through the cooling water inlets 6 and discharged through the cooling water outlets 5. This serves to dissipate heat from the bearing housing body, preventing the high-temperature medium in the pump body from transferring heat to the mechanical seal and bearing components.
[0027] In a specific embodiment of this utility model, eight through holes 7 are machined on the flange end face of the bearing housing body; an upper drainage hole 8 is machined in the vertical direction; four threaded holes are machined on the left end face, which are blind holes; and an O-ring groove 12 is machined on the right end face of the bearing housing body, the dimensions of which are shown in the view at “M”.
[0028] In a specific embodiment of this utility model, the lower part of the bearing bracket end frame is machined with a drain hole 10 and an adjustment hole 11. The number of drain holes 10 is generally one, and the number of adjustment holes 11 is generally three.
[0029] Figure 7 The diagram shows the working principle of this utility model. The bearing bracket 25 and the pump body 28 are fixed together by the first nut 26 and the first stud 27. Due to the high liquid pressure in the pump body, the bearing bracket and the pump body are sealed by two O-rings, the first O-ring 29 and the second O-ring 30. The first O-ring 29 is a radial seal and the second O-ring 30 is an axial seal.
[0030] The sealing component 23 is fixed to the bearing bracket 25 by the second nut 33 and the second stud 34, and sealed by an O-ring. Any trace amount of liquid leaking from the sealing component can be drained through the drain hole 10 at the bottom of the bearing bracket end.
[0031] The bearing component 22 and the bearing bracket 25 are fixed together by the third nut 26 and the third stud 27. During assembly, the radial clearance between the bearing component 22 and the pump shaft 21 is adjusted by adjusting screws 35. There are three adjusting screws 35, which are screwed into the three adjusting holes of the bearing bracket end bracket.
[0032] The radial clearance between the bushing 32 and the bearing housing 25 is 0.8 mm, and the length of the clearance is 90 mm. This clearance serves to relieve pressure, allowing high-pressure liquid in the pump body to flow into the sealing component through the clearance and then discharge from the upper drain hole 8 of the bearing housing. The pressure of the high-pressure liquid gradually decreases as it flows through the clearance, reaching a safe pressure that the sealing component can withstand. The bushing 32 is connected to the pump shaft 21 via a key 31, and the bushing 32 rotates synchronously with the pump shaft 21.
[0033] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents.
Claims
1. A bearing bracket structure for a boiler feedwater pump, characterized in that: The bearing bracket structure for the boiler feedwater pump includes: a bearing bracket body, a bearing bracket cover plate, a bearing bracket end frame, and a reinforcing rib plate. The bearing bracket body is welded to the bearing bracket cover plate; the bearing bracket end frame is welded to the bearing bracket body; the reinforcing rib plate is welded to the bearing bracket end frame and the bearing bracket body. After the bearing bracket body and the bearing bracket cover plate are welded, a sealed cavity is formed between them. The bearing bracket body is provided with a cooling water inlet hole and a cooling water outlet hole, which connect the outside world to the sealed cavity.
2. The bearing bracket structure for a boiler feedwater pump according to claim 1, characterized in that: The reinforcing ribs consist of 3 pieces.
3. The bearing bracket structure for a boiler feedwater pump according to claim 1, characterized in that: The bearing bracket end frame and the bearing bracket body are made of Q345B forgings, and the bearing bracket cover plate and reinforcing rib plate are made of Q345B.
4. The bearing bracket structure for a boiler feedwater pump according to any one of claims 1-3, characterized in that: Two cooling water inlets are machined at a 50° angle to the center line below the circumference of the bearing housing body, and two cooling water outlets are machined at a 50° angle to the center line above the circumference of the bearing housing body. The cooling water inlets and outlets connect the outside world with the sealed cavity Q.
5. The bearing bracket structure for a boiler feedwater pump according to claim 1, characterized in that: Several through holes are machined on the flange end face of the bearing housing body, an upper drainage hole is machined in the vertical direction, a threaded hole is machined on the left end face, the threaded hole is a blind hole, and an O-ring groove is machined on the right end face of the bearing housing body.
6. The bearing bracket structure for a boiler feedwater pump according to claim 1, characterized in that: The lower part of the bearing bracket end is machined with a drain hole and an adjustment hole.