CN212297006U

CN212297006U - Water cooling structure in shaft seal of marine circulating pump

Info

Publication number: CN212297006U
Application number: CN202020889208.4U
Authority: CN
Inventors: 袁霄; 唐春仁; 吴尉; 马骏; 郭娜; 凌素琴
Original assignee: Jiangsu Zhenhua Haike Equipment Technology Co Ltd
Current assignee: Jiangsu Zhenhua Haike Equipment Technology Co Ltd
Priority date: 2020-05-25
Filing date: 2020-05-25
Publication date: 2021-01-05
Anticipated expiration: 2030-05-25

Abstract

The utility model discloses a water-cooling structure in bearing seal of marine circulating pump, it includes the pump body, impeller, sealing ring, inner cup, pump cover, oiling joint, pump shaft and mechanical seal. The impeller arranged in the inner cavity of the pump body is positioned and connected by a pump shaft, the rear-section pump shaft is sleeved with an inner cover, a mechanical seal and a pump cover, the end face of the pump cover with a radial outer convex edge is provided with two axial counter bores which are sleeved with each other, and the open end of the inner axial counter bore is matched with the small end face of the inner cover and is fixedly and hermetically connected. The large end face of the inner cover is provided with a window which is communicated with an axial counter bore outside the pump cover and a balance hole preset by the impeller, so that an inner water cooling structure which automatically guides water from the balance hole of the impeller to cool the mechanical seal in the pump is formed. Through the technical improvement, the utility model discloses improved mechanical seal's operating condition conscientiously, concrete technical measure is including increasing sealed protection, improves lubricated condition, the water cooling of fixed point. The ship circulating pump shaft seal manufactured by the utility model has no fault and the running time reaches 1.25 ten thousand hours on average.

Description

Water cooling structure in shaft seal of marine circulating pump

Technical Field

The utility model belongs to the technical field of the bearing seal technical field's a technical scheme, specifically say, the utility model relates to a water-cooling structure in pump shaft bearing seal cooling structure, especially a marine circulating pump's bearing seal.

Background

From 1 month in 2020, international maritime organization requires that ships sailing in the global sea area must be equipped with a desulfurization device, and the generated waste gas can be freely discharged after reaching the standard after being purified. The equipment for maintaining the operation of the desulfurization device in the ship is a circulating pump, and the performance of the pump directly determines the operation quality of the desulfurization device. Currently, most of the countries use the ship-mounted desulfurization device to adopt the process route of washing the waste gas with running water, the process causes the SOx in the waste gas to be mixed into water, and the generated sewage is continuously output by a matched pump to be subjected to necessary purification treatment. The circulating pump matched with the marine desulfurization device is usually a centrifugal pump structure, an impeller arranged in a pump body is driven by a pump shaft, and a shaft seal is arranged at the matching part of the pump shaft and the pump body. As the medium transmitted by the circulating pump is rich in SOx, the overflowing part is easy to be corroded and damaged after long-term use, particularly the shaft seal is easy to be damaged, and the appearance form is that much leakage exists until the circulating pump cannot run. In order to enhance the sealing performance of the circulating pump, a mechanical seal is generally preferred to be used as a shaft seal in the industry. Nevertheless, the service life of the mechanical seal of the marine circulating pump is only half a year, and the mechanical seal still cannot meet the expectations of users. Firstly, the shaft seal operating temperature of the marine circulating pump is higher than that of other parts, so that the corrosion speed is high; secondly, Sox in the wastewater easily permeates into the mechanical seal to directly corrode the surfaces of all parts, so that corrosive damage is generated; and thirdly, the lubrication of a sealing friction pair in the mechanical seal is insufficient, high temperature is easily generated during heavy load, and rapid cooling causes cracking and damage of a moving ring or a static ring under the condition.

SUMMERY OF THE UTILITY MODEL

The utility model discloses mainly to prior art's not enough, provide a water-cooling structure in bearing seal of marine circulating pump, this pump shaft seal simple structure, sealed reliable, lubricated abundant, water-cooling is fast. The continuous fault-free operation can be carried out for more than 1.0 ten thousand hours.

The utility model discloses a technical goal is realized to following technical scheme.

A water cooling structure in a shaft seal of a marine circulating pump comprises a pump body, an impeller, a sealing ring, an inner cover, a pump cover, an oil injection joint, a pump shaft and a mechanical seal. The impeller is a centrifugal closed type impeller, the impeller arranged in the inner cavity of the pump body is positioned and connected by a pump shaft, and an inner cover, a mechanical seal and a pump cover are sequentially and coaxially sleeved on a pump shaft section positioned on the back of the impeller. The pump cover is in a flange shape, the end face with the radial outer convex edge is provided with two axial counter bores which are sleeved with each other, the open end of the inner axial counter bore is matched with the small end face of the inner cover and is fixedly and hermetically connected with the small end face of the inner cover to form a double-sealing cavity for containing mechanical seal and lubricating oil, the end face of the pump cover side is provided with a through hole for communicating the inner axial counter bore, and the outer end port of the through hole is hermetically connected with an oil injection joint. The large end surface of the inner cover is arranged between the large end surface of the pump cover and the rear end surface of the impeller to form the combination of the impeller and the pump cover. The sealing ring and the inner cover are matched, positioned and installed to form a sealing structure at the rear side of the impeller. The improvement is that: the large end face of the inner cover is provided with a window which is communicated with an axial counter bore of an outer channel of the pump cover and a balance hole preset by the impeller to form an inner water cooling structure which automatically guides water from the balance hole of the impeller to cool the mechanical seal in the pump.

As a further improvement, the area of the preset window of the large end surface of the inner cover is at least 15% larger than the sum of the areas of the balance holes configured on the impeller.

As a further improvement scheme, the oil injection joint is a valve-controlled oil injection joint.

Compared with the prior art, the utility model, following positive effect has:

1. the inner water cooling structure is simple, the cooling water source is reliable, the fixed-point synchronous cooling effect and the self-cooling effect are good, and the overheating problem during the operation of the mechanical seal can be avoided.

2. The valve-controlled oil injection joint is configured, so that lubricating oil can be supplemented as required, the lubricating conditions of the dynamic and static ring friction pairs are directly improved, and the operating efficiency of the mechanical seal is improved.

3. The mechanical seal in the double-sealing structure is prevented from being corroded by washing water, and the service life of the mechanical seal is greatly prolonged.

Drawings

Fig. 1 is a schematic view of the cross-sectional structure of the present invention.

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

The water-cooling structure in the shaft seal of the marine circulating pump shown in fig. 1 comprises a pump body 1, an impeller 2, a sealing ring 3, an inner cover 4, a pump cover 5, an oil filling joint 6, a pump shaft 7 and a mechanical seal 8. The impeller 2 is a centrifugal closed wheel, the impeller 2 arranged in the inner cavity of the pump body 1 is positioned and connected by a pump shaft 7, and an inner cover 4, a mechanical seal 8 and a pump cover 5 are sequentially and coaxially sleeved on a shaft section of the pump shaft 7 positioned on the back of the impeller 2. The pump cover 5 is in a flange shape, the end face with the radial outer convex edge is provided with two axial counter bores which are mutually sleeved, the open end of the inner axial counter bore 5.1 is matched with the small end face of the inner cover 4 and is fixedly and hermetically connected with the small end face to form a double-sealing cavity for containing mechanical seal 8 and lubricating oil, the end face of the side of the pump cover 5 is provided with a through hole for communicating the inner axial counter bore 5.1, the outer end port of the through hole is hermetically connected with an oil injection joint 6, and the oil injection joint 6 applied in the embodiment is a valve control type oil injection joint. The valve-controlled oil injection joint 6 is arranged, so that lubricating oil can be supplemented as required, the cleanness of a double-seal cavity where the mechanical seal 8 is positioned can be ensured, washing water is prevented from permeating, and a good operation condition is created for the mechanical seal 8. The large end surface of the inner cover 4 is arranged between the large end surface of the pump cover 5 and the rear end surface of the impeller 2 to form the combination of the impeller 2 and the pump cover 5. The sealing ring 3 and the inner cover 4 are matched, positioned and installed to form a rear side sealing structure of the impeller 2. In order to achieve the purpose of self-cooling the mechanical seal 8 by using a pressure water source generated when a circulating pump runs, a window 4.1 is arranged on the large end face of the inner cover 4, and the window 4.1 is used for communicating an outer channel axial through hole 5.2 of the pump cover 5 and a balance hole 2.1 preset by the impeller 2 to form an inner water cooling channel. In order to ensure that the inner water cooling channel is unblocked and a sufficient amount of cooling water is provided, the area of the configured window 4.1 is required to be larger than the area of the preset balance hole of the impeller 2, the specification of the circulating pump of the embodiment is Q =60T/H, H =30m, and the large end surface preset window 4.1 of the inner cover 4 is 10% larger than the sum of the areas of the balance holes 2.1 configured on the impeller 2 due to the relatively large specification.

Through the technical improvement, the utility model discloses improved mechanical seal's operating condition conscientiously, concrete technical measure mainly includes increases sealed protection, improves lubricated condition, and the fixed point water cooling. The failure-free running time of the shaft seal matched with the marine circulating pump in the embodiment can reach 1.25 ten thousand hours on average under the normal working condition.

Claims

1. A shaft seal inner water cooling structure of a marine circulating pump comprises a pump body (1), an impeller (2), a sealing ring (3), an inner cover (4), a pump cover (5), an oil injection joint (6), a pump shaft (7) and a mechanical seal (8); the impeller (2) is a centrifugal closed wheel, the impeller (2) arranged in the inner cavity of the pump body (1) is positioned and connected by a pump shaft (7), and an inner cover (4), a mechanical seal (8) and a pump cover (5) are sequentially and coaxially sleeved on a shaft section of the pump shaft (7) positioned on the back of the impeller (2); the pump cover (5) is in a flange shape, the end face with the radial outer convex edge is provided with two axial counter bores which are sleeved with each other, the open end of the inner axial counter bore (5.1) is matched with the small end face of the inner cover (4) and is fixedly and hermetically connected with the small end face to form a double-sealing cavity for containing mechanical seal (8) and lubricating oil, the side end face of the pump cover (5) is provided with a through hole for communicating the inner axial counter bore (5.1), and the outer port of the through hole is hermetically connected with an oil injection joint (6); the large end face of the inner cover (4) is arranged between the large end face of the pump cover (5) and the rear end face of the impeller (2) to form the combination of the impeller (2) and the pump cover (5); the sealing ring (3) and the inner cover (4) are matched, positioned and installed to form a rear side sealing structure of the impeller (2); the method is characterized in that: the large end face of the inner cover (4) is provided with a window (4.1), the window (4.1) is communicated with an outer channel axial counter bore (5.2) of the pump cover (5) and a balance hole (2.1) preset in the impeller (2), and an inner water cooling structure for automatically guiding water from the balance hole (2.1) of the impeller (2) to cool the mechanical seal (8) in the pump is formed.

2. The water-cooling structure in shaft seal of marine circulating pump according to claim 1, characterized in that: the area of the large end face preset window (4.1) of the inner cover (4) is at least 15% larger than the sum of the areas of the balance holes (2.1) configured on the impeller (2).

3. The water-cooling structure in shaft seal of marine circulating pump according to claim 1, characterized in that: the oil injection joint (6) is a valve-controlled oil injection joint.