Centrifugal pump gear speed increasing mechanism

Abstract

The utility model relates to the technical field of centrifugal pumps, in particular to a centrifugal pump gear speed increasing mechanism which comprises a motor shaft and a pump shaft and further comprises a box body, the motor shaft and the pump shaft extend into the box body from the two sides respectively, a large-diameter gear is arranged at the end, located in the box body, of the motor shaft, and a large-diameter gear is arranged at the end, located in the box body, of the pump shaft. The pump shaft is fixedly connected with a large-diameter gear through a locking assembly, one end, located in the box body, of the pump shaft is fixedly connected with a small-diameter gear through a locking assembly, the large-diameter gear is meshed with the small-diameter gear, and the part, located in the box body, of the pump shaft is supported through a supporting assembly. The large-diameter gear is installed on the motor shaft, the small-diameter gear is installed on the pump shaft through the locking assembly, and therefore the required speed increasing ratio is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal pumps, in particular to a gear speed increasing mechanism of a centrifugal pump. Background Art

[0002] At present, in the water resources, petroleum, chemical, metallurgy, steel and other industries, especially for the transportation and pressurization of liquids, a large number of centrifugal pumps are needed. Conventional centrifugal pumps on the market generally use a coaxial direct connection between the pump and the motor or the pump and the motor are independently manufactured and use a coupling connection structure.

[0003] For direct-connected units: the pump speed is determined by the motor. If the pump speed needs to be increased, the motor speed needs to be increased at the same time. The motor speed is generally ≤3500r / min. Increasing it further will greatly increase the manufacturing difficulty and cost of the motor.

[0004] The pump and motor have independent structures. After installation as a set, the structure size is large and the cost is high. At the same time, the speed is also limited by the motor speed, and the pump speed cannot be greatly increased. Summary of the Invention

[0005] The purpose of the utility model is to solve the above-mentioned shortcomings in the prior art and to propose a centrifugal pump gear speed increasing mechanism.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A centrifugal pump gear speed increasing mechanism is designed, comprising a motor shaft and a pump shaft, and also a casing. The motor shaft and the pump shaft extend into the casing from both sides respectively. One end of the motor shaft located in the casing is provided with a large-diameter gear. One end of the pump shaft located in the casing is fixedly connected to a small-diameter gear via a locking assembly. The large-diameter gear and the small-diameter gear are meshed. The portion of the pump shaft located in the casing is supported by a support assembly.

[0008] Furthermore, the locking assembly includes a fixing plate, a plug-in block provided on the side of the fixing plate facing the small diameter gear, a slot provided on the small diameter gear for the plug-in block to enter, and a fastening bolt passing through the fixing plate and threadedly connected to the pump shaft.

[0009] Furthermore, the large-diameter gear and the motor shaft are interference fit.

[0010] Furthermore, the support assembly includes a bearing body, a first bearing, a second bearing and a third bearing mounted on the bearing body, and the inner rings of the first bearing, the second bearing and the third bearing are connected to the pump shaft.

[0011] Furthermore, an oil slinger is provided on the portion of the motor shaft located inside the housing.

[0012] Furthermore, the box body is provided with a bearing sealing cover on one side of the pump shaft.

[0013] The utility model proposes a centrifugal pump gear speed increasing mechanism, which has the following beneficial effects:

[0014] The utility model has a compact structure, reduces the structural dimensions of the split pump and the motor, and reduces the manufacturing cost problem. A large-diameter gear is installed on the motor shaft and a small-diameter gear is installed on the pump shaft through a locking assembly, thereby achieving a required speed increase ratio; a support assembly is provided to withstand the axial force and radial force of the pump shaft, thereby ensuring the stability of the high-speed operation of the pump shaft; a bearing sealing cover is provided to seal the lubricating oil in the box body to avoid leakage of the lubricating oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the utility model;

[0016] Figure 2 for Figure 1 A in the middle is an enlarged schematic diagram; DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0018] Example, see Figure 1-2 A centrifugal pump gear speed increasing mechanism includes a motor shaft 1 and a pump shaft 2, and also includes a box body 3. The motor shaft 1 and the pump shaft 2 extend into the box body 3 from both sides respectively. The motor shaft 1 is located in the box body 3 and is provided with a large-diameter gear 4 at one end. The pump shaft 2 is located in the box body 3 and is fixedly connected to a small-diameter gear 6 at one end through a locking assembly 5. The large-diameter gear 4 and the small-diameter gear 6 are meshed. Preferably, the diameter of the large-diameter gear 4 in this embodiment is 2-3 times the diameter of the small-diameter gear 6. The part of the pump shaft 2 located in the box body 3 is supported by a support assembly 7.

[0019] The utility model has a compact structure, reduces the structural dimensions of the split pump and the motor, and reduces manufacturing costs. By installing a large-diameter gear 4 on the motor shaft 1 and installing a small-diameter gear 6 on the pump shaft 2 through a locking assembly 5, the required speed increase ratio is achieved; by providing a support assembly 7 to withstand the axial force and radial force of the pump shaft 2, the stability of the high-speed operation of the pump shaft 2 is ensured.

[0020] In an optional embodiment of the present invention, the locking assembly 5 includes a fixing plate 501, a plug-in block 502 provided on the side of the fixing plate 501 facing the small-diameter gear 6, a slot 503 provided on the small-diameter gear 6 for the plug-in block 502 to enter, and a fastening bolt 504 passing through the fixing plate 501 and screwed to the pump shaft 2. After the small-diameter gear 6 is fixed to the pump shaft 2 by the fixing plate 501 and the fastening bolt 504, different speed increase ratios of the pump shaft 2 can be achieved.

[0021] In an optional embodiment of the present invention, the large diameter gear 4 and the motor shaft 1 are interference fit. After the large diameter gear 4 is installed on the motor shaft 1, the required speed increase ratio is achieved by fitting with the small diameter gear 6.

[0022] In an optional embodiment of the present invention, the support assembly 7 includes a bearing body 701, a first bearing 702, a second bearing 703 and a third bearing 704 installed on the bearing body 701, and the inner rings of the first bearing 702, the second bearing 703 and the third bearing 704 are connected to the pump shaft 2. The support of the pump shaft 2 by the first bearing 702, the second bearing 703 and the third bearing 704 can withstand the axial force and radial force of the pump shaft 2, thereby ensuring the stability of the high-speed operation of the pump shaft 2.

[0023] In an optional embodiment of the present invention, the portion of the motor shaft 1 located inside the housing 3 is provided with an oil slinger 8, which injects lubricating oil into the housing 3 to lubricate the large-diameter gear 4 and the small-diameter gear 6 and take away the heat generated during operation. At the same time, the oil slinger 8 is used to transport the lubricating oil to the support assembly 7 to lubricate and cool the support assembly 7.

[0024] In an optional embodiment of the present invention, a bearing sealing cover 9 is provided on one side of the pump shaft 2 of the housing 3. Preferably, the bearing sealing cover 9 in this embodiment is fixed to the housing 3 by bolts; the bearing sealing cover 9 seals the lubricating oil in the housing 3, and a sealing gasket 10 is installed on the side flange of the motor 11 connected to the motor shaft 1 to prevent leakage of the lubricating oil.

[0025] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

[0026] In the description of this specification, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the technical solutions of this patent and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this patent application.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this patent application, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0028] In this specification, unless otherwise specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this specification based on specific circumstances.

[0029] In this specification, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0030] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0031] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A centrifugal pump gear speed increasing mechanism, comprising a motor shaft (1) and a pump shaft (2), characterized in that: It also includes a housing (3), wherein the motor shaft (1) and the pump shaft (2) extend into the interior of the housing (3) from both sides respectively; one end of the motor shaft (1) located in the housing (3) is provided with a large-diameter gear (4); one end of the pump shaft (2) located in the housing (3) is fixedly connected to a small-diameter gear (6) via a locking assembly (5); the large-diameter gear (4) and the small-diameter gear (6) are meshed; and the portion of the pump shaft (2) located in the housing (3) is supported by a support assembly (7).

2. The centrifugal pump gear speed increasing mechanism according to claim 1, characterized in that: The locking assembly (5) comprises a fixing plate (501), a plug-in block (502) provided on the side of the fixing plate (501) facing the small-diameter gear (6), a slot (503) provided on the small-diameter gear (6) for the plug-in block (502) to enter, and a fastening bolt (504) passing through the fixing plate (501) and being threadedly connected to the pump shaft (2).

3. The centrifugal pump gear speed increasing mechanism according to claim 1, characterized in that: The large-diameter gear (4) and the motor shaft (1) are interference-fitted.

4. The centrifugal pump gear speed increasing mechanism according to claim 1, characterized in that: The support assembly (7) comprises a bearing body (701), a first bearing (702), a second bearing (703) and a third bearing (704) mounted on the bearing body (701), wherein the inner rings of the first bearing (702), the second bearing (703) and the third bearing (704) are connected to the pump shaft (2).

5. The centrifugal pump gear speed increasing mechanism according to claim 1, characterized in that: The portion of the motor shaft (1) located inside the housing (3) is provided with an oil slinger (8).

6. The centrifugal pump gear speed increasing mechanism according to claim 1, characterized in that: The box body (3) is provided with a bearing sealing cover (9) on one side of the pump shaft (2).

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