CN202901238U - High pressure pump output shaft oil sealing structure - Google Patents

Abstract

The utility model provides a high pressure pump output shaft oil sealing structure, and belongs to the technical field of machinery. The problem that the existing output shaft oil sealing is easy to lose effectiveness and to leak oil is solved. The high pressure pump output shaft oil sealing structure comprises a speed reducer shell body, a first bearing, a second bearing, an output shaft, a pressing cover, a first oil sealing and a second oil sealing. A separating plate is arranged between the first bearing and the second bearing. According to the high pressure pump output shaft oil sealing structure, two-level sealing of a double oil sealing is adopted. The other oil sealing can be sealed regularly under the condition that one oil sealing loses effectiveness, thus a sealing effect is good and oil leakage is not easy to happen.

Description

High pressure pump output shaft oil seal structure

technical field

The utility model belongs to the technical field of machinery, and relates to a fertilizer production equipment, in particular to an oil seal structure of an output shaft of a high-pressure pump.

Background technique

The existing high-pressure pump reducer for urea is usually a planetary reducer, and the oil seal of the output shaft is usually a single-stage skeleton oil seal. And wear is also relatively serious, the lubricating oil on the output shaft is easy to crawl along the surface of the output shaft relying on its adhesion, when the quality of the surface of the output shaft is slightly reduced, the oil is easy to cause oil leakage through the lip of the skeleton oil seal.

Contents of the invention

The purpose of this utility model is to propose a high-pressure pump output shaft oil seal structure with better sealing performance in view of the above-mentioned problems existing in the prior art.

The purpose of this utility model can be achieved through the following technical solutions: provide a high-pressure pump output shaft oil seal structure, including the reducer housing, the first bearing and the second bearing abutting on the inner wall of the reducer housing, interspersed with the The output shaft in the first bearing and the second bearing, the gland that closes the opening at one end of the reducer housing, the first oil seal and the second oil seal that are sleeved on the output shaft and located between the gland and the second bearing, the first A spacer plate is arranged between the first bearing and the second bearing, the spacer plate is pressed by the first bearing and the second bearing, there is a cavity between the spacer plate and the housing, and the housing of the reducer An oil inlet hole is opened on the upper part, and the oil inlet hole communicates with the cavity. The gland forms a protruding part downward, and the protruding part is pressed between the first oil seal and the second oil seal. The lower end of the gland An oil channel is provided, the space between the first oil seal and the second oil seal communicates with the oil channel, an oil accumulation chamber is formed between the gland and the lower end of the reducer housing, and the lower end of the reducer housing An oil return hole is also provided, and the oil accumulation chamber communicates with the oil channel and the oil return hole.

In the above-mentioned high-pressure pump output shaft oil seal structure, a limiting platform is formed on the inner wall of the reducer housing, one side of the first bearing abuts against the limiting platform, and a limiting platform is set on the right side of the second bearing. snap ring.

In the above-mentioned high-pressure pump output shaft oil seal structure, the gland includes a cover body and a tail plate, the cover body is bolted to the reducer housing, and the tail plate is connected to the end of the cover body.

In the above-mentioned high-pressure pump output shaft oil seal structure, a limiting flange is formed on one side of the cover body inwardly, and the limiting flange abuts against the first oil seal.

Compared with the prior art, according to the high-pressure pump output shaft oil seal structure of the utility model, a two-stage seal of double oil seals is adopted. When one of the oil seals fails, the second oil seal can seal normally, so the sealing effect is good. Oil leakage is not easy to occur.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the output shaft oil seal of the high pressure pump of the present invention.

Detailed ways

The following are specific embodiments of the utility model and in conjunction with the accompanying drawings, the technical solution of the utility model is further described, but the utility model is not limited to these embodiments.

As shown in Figure 1, the high-pressure pump output shaft oil seal structure according to the present invention includes a reducer housing 1, a first bearing 2 and a second bearing 3 abutting on the inner wall of the reducer housing 1, interspersed in the first bearing 2 and the output shaft 4 in the second bearing 3, the gland 5 that closes the opening at one end of the reducer housing 1, the first oil seal 6 that is sleeved on the output shaft 4 and is located between the gland 5 and the second bearing 3, and The second oil seal 7, a spacer plate 8 is arranged between the first bearing 2 and the second bearing 3, and the spacer plate 8 is pressed by the first bearing 2 and the second bearing 3, and the spacer plate 8 and the second bearing 3 are pressed together. There is a cavity 9 between the housings 1, an oil inlet 10 is opened on the upper part of the reducer housing 1, the oil inlet 10 communicates with the cavity 9, and the gland 5 forms a protrusion 51 downwards, The protruding part 51 is pressed between the first oil seal 6 and the second oil seal 7, the lower end of the gland 5 is provided with an oil channel 11, the space 14 between the first oil seal 6 and the second oil seal 7 and The oil channel 11 communicates, and an oil accumulation cavity 12 is formed between the gland 5 and the lower end of the reducer housing 1, and an oil return hole 13 is also provided at the lower end of the reducer housing 1, and the oil accumulation cavity 12 It communicates with the oil channel 11 and the oil return hole 13.

In the above-mentioned high-pressure pump output shaft oil seal structure, the first bearing 2 and the second bearing 3 are both rolling bearings.

The engine oil used to lubricate the first bearing 2 and the second bearing 3 enters the cavity 9 through the oil inlet hole 10, and the first bearing 2 and the second bearing 3 are splashed and lubricated with the rotation of the output shaft 4, and the excess oil passes through the first The second bearing enters in the oil accumulation cavity 12, and finally flows out and recovers through the oil return hole. If the first oil seal fails, excess engine oil enters the oil accumulation chamber 12 through the oil passage 11, and finally flows out through the oil return hole for recovery.

It can be seen that even if the first oil seal fails, the engine oil will not leak out through the gland.

In the above-mentioned high-pressure pump output shaft oil seal structure, a limiting platform 15 is formed on the inner wall of the reducer housing 1, one side of the first bearing 2 abuts on the limiting platform 15, and the second bearing 3 Limit snap ring 16 is set on the right side. The limit platform 15 and the limit snap ring 16 position the first bearing and the second bearing.

In the above-mentioned high-pressure pump output shaft oil seal structure, the gland 5 includes a cover body 52 and a tail plate 53, the cover body 52 is bolted to the reducer housing 1, and the tail plate 53 is connected to the cover body 52. Ends.

In the above-mentioned high-pressure pump output shaft oil seal structure, a limit flange 54 is formed on one side of the cover body 52 inward, and the limit flange 54 abuts against the first oil seal 6 .

The specific embodiments described herein are only examples to illustrate the spirit of the present invention. Those skilled in the technical field to which the utility model belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the utility model or go beyond the appended claims defined range.

Claims (4)

1. A high-pressure pump output shaft oil seal structure, characterized in that it includes a reducer housing, a first bearing and a second bearing abutting on the inner wall of the reducer housing, and a bearing interspersed in the first bearing and the second bearing The output shaft, the gland that closes the opening at one end of the reducer housing, the first oil seal and the second oil seal that are sleeved on the output shaft and located between the gland and the second bearing, and the gap between the first bearing and the second bearing A spacer plate is provided, and the spacer plate is pressed by the first bearing and the second bearing. There is a cavity between the spacer plate and the casing, and an oil inlet hole is opened on the upper part of the reducer casing. The oil inlet hole communicates with the cavity, and the gland forms a protruding part downwards, and the protruding part is pressed between the first oil seal and the second oil seal. An oil channel is provided at the lower end of the gland, and the first The space between the first oil seal and the second oil seal communicates with the oil channel, and an oil accumulation cavity is formed between the gland and the lower end of the reducer housing, and an oil return hole is also provided at the lower end of the reducer housing, so The oil accumulation chamber communicates with the oil channel and the oil return hole. 2. The oil seal structure of the output shaft of the high-pressure pump according to claim 1, wherein a limiting platform is formed on the inner wall of the reducer housing, and one side of the first bearing abuts against the limiting platform, so that A limit snap ring is provided on the right side of the second bearing. 3. The high-pressure pump output shaft oil seal structure according to claim 1, wherein the gland includes a cover body and a tail plate, the cover body is connected to the reducer housing by bolts, and the tail plate is connected to the cover end of the body. 4 . The oil seal structure for the output shaft of a high-pressure pump according to claim 3 , wherein a limiting flange is formed on one side of the cover body inward, and the limiting flange abuts against the first oil seal. 5 .

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