Semi-enclosed centrifugal pump

Abstract

The present invention discloses a semi-enclosed centrifugal pump, including a gear box, a pump housing for housing gears, a lateral oil inlet hole for connecting the inside and outside of the pump housing to the tooth root of the corresponding gears, an oil outlet groove is provided at the bottom of the inner cavity of the pump housing, an oil outlet hole connected to the oil outlet groove is provided on the top of the pump housing, and the oil outlet hole is connected to an oil delivery device. The present invention uses high-speed rotating gears as pump blades, and the pump housing and gears are combined into a pump body, which reduces power input, has a simple structure, and saves space.

Description

Technical Field

[0001] The present invention relates to the technical field of pumps, and in particular to a centrifugal pump. Background Art

[0002] High-speed gearboxes have limited space, and lubrication requires a relatively complex circulation system. Most of them use equipment such as circulation pumps outside the gearbox, which increases costs significantly. Summary of the invention

[0003] The purpose of the present invention is to solve the problems existing in the background technology, and to propose a semi-enclosed centrifugal pump with a simple structure and using high-speed gears as pump blades.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is:

[0005] A semi-enclosed centrifugal pump comprises a gear box body, wherein a pump casing for housing gears is arranged inside the gear box body, a transverse oil inlet hole for communicating with the tooth root of the corresponding gear inside and outside the pump casing is arranged on the side wall of the pump casing, an oil outlet groove is arranged at the bottom of the inner cavity of the pump casing, an oil outlet hole communicating with the oil outlet groove is arranged on the top of the pump casing, and the oil outlet hole is connected to an oil delivery device.

[0006] A further improvement of the present invention is that a vertical oil inlet hole communicating with the transverse oil inlet hole is provided at the bottom of the pump housing, and a cavity for storing lubricating oil is provided between the outer wall of the pump housing and the inner wall of the gear box body.

[0007] A further improvement of the present invention is that the longitudinal cross-section of the transverse oil inlet hole is in the shape of an arc, and the diameter of the arc is larger than the root circle diameter of the gear and smaller than the pitch circle diameter.

[0008] A further improvement of the present invention is that the oil outlet groove and the oil outlet hole are connected through an arc-shaped oil outlet channel, and the oil outlet groove and the transverse oil inlet hole are arranged in parallel and correspondingly.

[0009] A further improvement of the present invention is that an input shaft is arranged at the center of the gear, and the input shaft passes through the side wall of the pump housing and is mounted on the side wall of the gear housing through a bearing.

[0010] Due to the adoption of the above technical solution, the technical progress achieved by the present invention is:

[0011] Semi-enclosed centrifugal pumps use high-speed rotating gears as pump impellers. The pump casing and gears are combined into a pump body, which reduces power input, has a simple structure, and saves space. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the present invention;

[0013] Figure 2 It is a schematic diagram of the structure of the pump casing;

[0014] Figure 3 It is a cross-sectional schematic diagram of the present invention at the oil inlet.

[0015] Among them: 1, gear box body 2, gear 3, pump housing 4, input shaft 5, oil outlet hole 6, horizontal oil inlet hole 7, oil outlet groove 8, vertical oil inlet hole 9, oil outlet channel 10, cavity.

[0016] The present invention is further described in detail below with reference to the accompanying drawings and embodiments:

[0017] Semi-enclosed centrifugal pumps, such as Figure 1 , Figure 2 , Figure 3 As shown, it includes a gear box body 1, in which a pump housing 3 for housing a gear 2 is arranged, and a transverse oil inlet hole 6 is arranged on the side wall of the pump housing 3. The transverse oil inlet hole 6 corresponds to the root position of the gear 2, and its longitudinal cross-section is an arc shape, and the arc diameter is larger than the root circle diameter of the gear 2 and smaller than its pitch circle diameter.

[0018] A vertical oil inlet hole 8 connected to the transverse oil inlet hole 6 is provided at the bottom of the pump casing 3, and a cavity 10 for storing lubricating oil is provided between the outer wall of the pump casing 3 and the inner wall of the gear box body 1. One end of the vertical oil inlet hole 8 is connected to the transverse oil inlet hole 6, and the other end is connected to the cavity 10 for storing lubricating oil. The transverse oil inlet hole 6 and the vertical oil inlet hole 8 are connected to the inner and outer cavities of the pump casing 3 together.

[0019] An oil outlet groove 7 is provided at the bottom of the inner cavity of the pump housing 3, and an oil outlet hole 5 is provided on the top of the pump housing 3. The oil outlet groove 7 and the oil outlet hole 5 are connected through an arc-shaped oil outlet channel 9. The oil outlet groove 7 corresponds to the tooth top position of the gear 2 and is arranged parallel to the horizontal oil inlet hole 6. The oil outlet hole 5 is connected to the oil delivery device.

[0020] An input shaft 4 is arranged at the center of the gear 2. The input shaft 4 passes through the side wall of the pump housing 3 and is mounted on the side wall of the gear box body 1 through a bearing.

[0021] The gear 2 in the semi-enclosed centrifugal pump rotates at high speed, generating centrifugal force. Negative pressure is generated in the tooth root area of ​​the gear 2, which attracts the lubricating oil in the cavity 10 to enter the tooth root area of ​​the gear 2 inside the pump housing 3 through the vertical oil inlet hole 8 and the horizontal oil inlet hole 6. Under the action of centrifugal force, the lubricating oil is thrown outward, and positive pressure is generated on the tooth top. The lubricating oil is sprayed to the oil outlet hole 5 through the oil outlet groove 7 and the oil outlet channel 9, and then sprayed to the oil delivery device through the oil outlet hole 5, and then flows back to the cavity 10, forming a circulating flow of the lubricating oil.

Claims

1. Semi-enclosed centrifugal pump, characterized in that: The invention comprises a gear housing (1), wherein a pump housing (3) in which a gear (2) is installed is arranged inside the gear housing (1), a transverse oil inlet hole (6) is arranged on the side wall of the pump housing (3) and is connected to the tooth root of the corresponding gear (2) inside and outside the pump housing (3), an oil outlet groove (7) is arranged at the bottom of the inner cavity of the pump housing (3), and an oil outlet hole (5) in communication with the oil outlet groove (7) is arranged on the top of the pump housing (3), and the oil outlet hole (5) is connected to an oil delivery device; The bottom of the pump housing (3) is provided with a vertical oil inlet hole (8) communicating with the transverse oil inlet hole (6), and a cavity (10) for storing lubricating oil is provided between the outer wall of the pump housing (3) and the inner wall of the gear box body (1); The longitudinal cross-section of the transverse oil inlet hole (6) is in the shape of an arc, and the diameter of the arc is larger than the root circle diameter of the gear (2) and smaller than the pitch circle diameter thereof; The oil outlet groove (7) is connected to the oil outlet hole (5) via an arc-shaped oil outlet channel (9), and the oil outlet groove (7) is arranged in parallel with the transverse oil inlet hole (6); An input shaft (4) is arranged at the center of the gear (2), and the input shaft (4) passes through the side wall of the pump housing (3) and is mounted on the side wall of the gear housing (1) via a bearing; The gear (2) in the semi-enclosed centrifugal pump rotates at high speed, generating centrifugal force. The tooth root area of ​​the gear (2) generates negative pressure, which attracts the lubricating oil in the cavity (10) to enter the tooth root area of ​​the gear (2) inside the pump housing (3) through the vertical oil inlet hole (8) and the horizontal oil inlet hole (6). Under the action of centrifugal force, the lubricating oil is thrown outward, and positive pressure is generated on the tooth top. The lubricating oil is sprayed toward the oil outlet hole (5) through the oil outlet groove (7) and the oil outlet channel (9), and then sprayed toward the oil delivery device through the oil outlet hole (5), and then flows back to the cavity (10), forming a circulation flow of the lubricating oil.

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