CN218062779U - Mechanical seal convenient to clean - Google Patents

Abstract

The utility model discloses a mechanical seal convenient to it is clean, including sealed rotating ring of axle sleeve, gland and cooperation and quiet ring, the gland suit is on the axle sleeve, and the rotating ring passes through power component with the axle sleeve to be connected, and quiet ring is kept away from the rotating ring end and is connected its characterized in that through a plurality of compensating spring and gland: the shaft sleeve, the gland, the static ring and the moving ring jointly enclose a cavity, at least two blowing holes are formed in the gland, the blowing holes are communicated with the cavity, the compensating spring is located in the cavity, the cleaning cavity is filled with cleaning fluid into the cavity through the blowing holes, and the problem that the compensating spring is invalid due to the fact that the compensating spring accumulates residues at the position of the compensating spring after the mechanical seal runs for a long time is solved.

Description

Mechanical seal convenient to clean

Technical Field

The utility model relates to a mechanical seal especially relates to a mechanical seal convenient to it is clean.

Background

The Chuanke 1 well is built and put into production in 2011, 4 lean liquid pumps are arranged in the station, the pump adopts an SDV120-90X2 double-stage single-suction horizontal split pump of Shenyang square pump industry Co., ltd, the pump is arranged in a double-support positioning mode, and a set of mechanical seal is arranged on a main shaft of a pump body in order to prevent materials in the pump from leaking. When the mechanical seal is used, leakage happens for many times, a large amount of sulfur-containing media are exposed in the air due to leakage of the mechanical seal of the pump, serious potential environmental pollution hazards are brought, huge waste of manpower, material resources and financial resources is caused, and the replacement cost per year is up to more than 100 ten thousand yuan after accounting.

Through the observation to sealed leakage phenomenon, the reason that the analysis machine sealed the inefficacy, improved to it and changed original big spring into a plurality of little springs to change the floating ring into quiet ring, make the rotating member structure simpler, the operation is more stable. However, in the process of trial, the service life of about one week is improved to about four months. But still not with the expected effect, through the analysis of the mechanical seal for leak failure by mechanical seal disassembly: the process medium at the driving end leaks out from the space between the shaft sleeve and the gland by observation, the initial leakage amount is about 0.5 drop/minute, and the initial leakage amount shows a trend of gradually increasing, after disassembly, the sealing end face is basically intact, the 0-shaped ring slightly deforms, dry medium residues exist at the compensating spring, the medium residues are also accumulated in the compensating spring, and some compensating springs are failed to further cause the floating property of the static ring to be poor, so that the continuous mechanical seal is reformed aiming at the phenomenon.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a mechanical seal convenient to it is clean, solve above-mentioned mechanical seal's compensation spring department accumulation medium residue after long-time operation for the problem that compensation spring became invalid.

In order to realize the purpose, the utility model discloses a technical scheme is: the utility model provides a mechanical seal convenient to it is clean, includes axle sleeve, gland and the sealed rotating ring of cooperation and quiet ring, the gland suit is on the axle sleeve, the rotating ring passes through power component with the axle sleeve and is connected, the quiet ring is kept away from the rotating ring end and is connected its characterized in that through a plurality of compensating spring and gland: the shaft sleeve, the gland, the static ring and the dynamic ring jointly enclose a cavity, at least two blowing holes are formed in the gland and communicated with the cavity, and the compensating spring is located in the cavity.

Preferably, the purge hole is located on the gland side wall.

Preferably, the number of the purge holes is two.

Preferably, the purge hole divide into drainage portion and screw portion, screw portion one end intercommunication is external, the one end intercommunication cavity of drainage portion, the diameter of screw portion is greater than drainage portion, be equipped with the screw thread on the inner wall of screw portion.

Preferably, the threaded portion is detachably provided with a dust cover.

Preferably, O-shaped sealing rings are arranged between the outer side of the static ring and the gland and between the outer side of the dynamic ring and the shaft sleeve.

Preferably, the bearing further comprises a transmission ring and a positioning block, the transmission ring is sleeved outside the shaft sleeve and is fixedly connected with the shaft sleeve, the transmission ring is located at the end, away from the medium, of the shaft sleeve, the positioning block is fixedly connected with the gland, the side wall of the transmission ring protrudes outwards to form a positioning ring, and an inner groove in the side wall of the positioning block forms a second positioning groove matched with the positioning ring.

Preferably, the shaft sleeve is provided with a spring groove for accommodating a compensation spring, and the push ring is positioned between the spring and the stationary ring.

Preferably, the power assembly comprises a power block, a clamping groove is formed in one end, located on the medium, of the shaft sleeve, the power block is arranged in the clamping groove, and a first positioning groove matched with the power block is formed in one end, far away from the static ring, of the movable ring.

Compared with the prior art, the utility model has the advantages of:

1. the cleaning holes are additionally arranged, the use and maintenance of the mechanical seal are followed, the cleaning fluid is introduced into the chamber to clean the chamber in the maintenance process, the maintenance frequency of the lean oil pump is reduced, and the service life of the mechanical seal is prolonged. Through use verification, the service life of the improved mechanical seal is greatly prolonged from about one week before improvement to half a year or even longer, the operation of the barren pump is more stable, the problems of high maintenance frequency and high operation cost of the barren pump are effectively solved, the continuous and stable operation of the production is powerfully ensured, the service life of equipment is prolonged, the production cost is reduced, the mechanical pump is ensured to be in a good operation state at all times, and the continuous and stable operation of the production is powerfully ensured;

2. before improvement, a mechanical seal needs to be replaced about four months on average for each pump, four pumps are used for one pump, after improvement, the mechanical seal is replaced about one pump every year on average, eight mechanical seals are saved and replaced, and maintenance cost and part purchasing cost are effectively reduced.

Drawings

FIG. 1 is a schematic view of a rotary section of the present invention;

fig. 2 is a schematic cross-sectional view of a gland.

In the figure: 1. a shaft sleeve; 12. flushing the hole; 121. a threaded end; 122. a drainage end; 13. a purge hole; 131. A threaded portion; 132. a drainage part; 14. a chamber; 2. a moving ring; 3. a stationary ring; 4. a push ring; 5. a gland; 6. positioning blocks; 61. a bolt; 7. a drive ring; 71. a screw; 8. a compensation spring; 9. an O-shaped sealing ring.

Detailed Description

The present invention will be further explained below.

It should be noted that in the following description, the medium end is located on the left side of fig. 1 for convenience of explanation, and the air end is located on the right side of fig. 1.

The embodiment is as follows:

referring to fig. 1, a mechanical seal for easy cleaning is shown, comprising a shaft sleeve 1, a gland 5, and a moving ring 2 and a stationary ring 3 which cooperate to seal. Specifically, the shaft sleeve 1 is sleeved on a rotating shaft of the lean oil pump, and the gland 5 is fixedly connected with a pump shell of the lean oil pump. The movable ring 2 is connected with the shaft sleeve 1 through a power assembly, and the end, far away from the movable ring 2, of the static ring 3 is connected with the gland 5 through a plurality of compensating springs 8. The shaft sleeve 1, the gland 5, the stationary ring 3 and the moving ring 2 jointly enclose a chamber 14, and the compensation spring 8 is located in the chamber 14, in this embodiment, at least two purge holes 13 are formed in the gland 5, and the purge holes 13 are communicated with the chamber 14.

In the specific working process: cleaning fluid is introduced into one of the blowing holes 13, specifically, the cleaning fluid is pressure clean water or compressed air, then the cleaning fluid passes through the chamber 14, under the action of water pressure or air flow, the cleaning fluid can take away the compensation spring 8 and impurities such as medium residues, dust, grease and the like in the chamber 14, and finally flows out through the other blowing holes 13. The whole purging process lasts for 3-5 minutes, and impurities in the chamber 14 are cleaned by purging regularly. Solid impurities in the compensating spring 8 are reduced, the possibility of failure of the compensating spring 8 is reduced, namely, the floatability of the static ring 3 is kept, and the possibility that a gap is formed between the sealing surfaces of the moving ring 2 and the static ring 3 to cause failure of mechanical seal is reduced, so that the normal operation of a lean solution pump is influenced.

Further, since the purpose of the modification is to wash out the medium residue, dust, grease and other impurities in the chamber 14, it is more important to prevent the solid matter accumulated in the chamber 14 from accumulating in the compensating spring 8, which results in the failure of the compensating spring 8. Therefore, in order to ensure the flushing effect of the chamber 14, the pressure of the cleaning fluid in the chamber 14 is not greatly changed, and the flushing effect on the impurities in the chamber 14 is consistent. The number of the purge holes 13 is preferably two, and by means of one cleaning fluid inlet and one impurity fluid outlet, the situation that when more purge holes 13 are used, the fluid pressure of part of the purge holes is smaller due to the fact that a plurality of fluid outlets are arranged, and therefore impurities can remain in the chamber 14 is reduced.

Preferably, the gland 5 is provided with a flushing hole 12, the flushing hole 12 comprises a threaded end 121 and a flow guiding end 122, the tail end of the flushing hole 12 faces the stationary ring 3 and the movable ring 2, the flushing hole 12 is used for taking away particulate matters near the end face and heat generated by friction, and when the device is installed and used, the flushing hole 12 is vertically installed, namely the flushing hole 12 faces vertically upwards, so that the particulate matters can be conveniently flushed, and the risk of blocking the pipeline is reduced. Also in this embodiment, for the best flushing effect, the two purge holes 13 are arranged coaxially, see fig. 2. Further, in this embodiment, the blowing hole 13 is divided into a drainage portion 132 and a threaded portion 131, the diameter of the threaded portion 131 is larger than that of the drainage portion 132, threads are arranged inside the threaded portion 131, the labor intensity of maintenance personnel in the 3-5 minute flushing process can be reduced by screwing the nozzle through the threaded portion 131, and in order to reduce the processing cost and the convenience of later maintenance flushing of this embodiment, the threaded end 121 of the flushing hole 12 and the threaded portion 131 of the blowing hole 13 are arranged in the same inner diameter, so that during processing, thread processing can be completed without changing a tool, and the size of a nozzle does not need to be changed when workers maintain. Meanwhile, as the flushing holes 12 and the purge holes 13 have certain diameters, in order to reduce the communication between the flushing holes 12 and the purge holes 13 caused by processing errors in the processing, in this embodiment, an included angle between a central axis of one of the flushing holes 12 and a central axis of the purge hole 13 is 90-13 degrees. Meanwhile, in the embodiment, in order to reduce the residual fluid in the chamber 14 during the cleaning and maintenance using clean water, an included angle between one of the flushing holes 12 and the central axis of the purging hole 13 is 18 degrees. Through the arrangement, in practical use, the two flushing holes 12 face upwards and face downwards, and the upward flushing holes 12 are screwed into a worker. The downward facing flushing port 12 facilitates the discharge of liquid from the chamber 14. Meanwhile, as the flushing holes 12 are communicated with the contact surfaces of the static ring 3 and the movable ring 2 and the cleaning holes 13 are communicated with the chamber 14, in order to reduce the dust deposition problem caused by the flushing holes 12 and the cleaning holes 13 in the two places, dust covers can be detachably arranged on the flushing holes 12 and the cleaning holes 13.

Referring to fig. 1, it includes the power piece to show in the figure that power component includes, wherein has seted up the draw-in groove at the left end of axle sleeve 1, and wherein power piece fixed connection is in the draw-in groove, and the one end that quiet ring 3 was kept away from to rotating ring 2 is equipped with and is located the draw-in groove with the first constant head tank of power piece assorted and the left end of rotating ring 2, and rotating ring 2 is through first constant head tank and power piece block in the draw-in groove, makes rotating ring 2 can rotate along with axle sleeve 1.

Referring to fig. 1, the end of the stationary ring 3 away from the moving ring 2 is connected to the gland 5 through a plurality of compensating springs 8, specifically, the number of the compensating springs 8 is twelve, and since the rotation speed of the rotor of the lean liquid pump is 2950rpm, when the rotation speed is running, the elastic force provided by the compensating springs 8 under the influence of centrifugal force may be unstable, in order to make the spring force provided by the compensating springs 8 uniform, the lifting causes the moving ring 2 and the stationary ring 3 to be attached, and reduces the possibility that the seal is easy to leak, for those skilled in the art, the number of the compensating springs 8 may also be other numbers such as ten, which is not limited in this application. Meanwhile, in this embodiment, the compensation spring 8 is in a compressed state, and the compensation spring 8 in the compressed state can apply thrust to the moving ring 2 to the stationary ring 3, so that the stationary ring 3 and the moving ring 2 keep in contact, and sealing is achieved. Simultaneously for the pressure that makes quiet ring 3 receive is more even, be equipped with throw-away collar 4 between spring and quiet ring 3, pass through throw-away collar 4 as middle biography power movable part for the thrust that quiet ring 3 received is more even. Meanwhile, in order to realize the fixation of the compensation spring 8 in the working process, a spring groove for accommodating the compensation spring 8 is formed in the shaft sleeve 1, and the compensation spring 8 is arranged in the spring groove.

Referring to fig. 1, in order to prevent the medium from entering the inside of the mechanical seal and causing the mechanical seal to fail, in the present embodiment, O-rings 9 are disposed between the outer side of the stationary ring 3 and the gland 5 and between the outer side of the movable ring 2 and the shaft sleeve 1.

Referring to fig. 1, in order to position and fix the shaft sleeve 1, in this embodiment, the shaft sleeve further includes a transmission ring 7 and a positioning block 6, the transmission ring 7 is sleeved outside the shaft sleeve 1 and is fixedly connected to the shaft sleeve 1, specifically, connected by a bolt 61, the transmission ring 7 is located at a position far away from the medium end of the shaft sleeve 1, the positioning block 6 is fixedly connected to the gland 5, specifically, connected by a screw 71, a side wall of the transmission ring 7 protrudes outward to form a positioning ring, and an inner groove of a side wall of the positioning block 6 is formed in a second positioning groove matched with the positioning ring. The positioning and fixing thus provided reduces the grooving on the sleeve 1, preventing stress concentration on the sleeve 1.

The specific using process is as follows: when the machine seal has a small amount of leakage, in order to avoid the leakage to the compensation spring 8, when the machine seal is temporarily stopped, clean water or clean compressed air with the pressure of less than or equal to 0.2MPa is injected into the upward blowing hole 13 of the gland 5 for blowing for 3-5 minutes, and the cleaning fluid can take away impurities such as medium residues, dust, grease and the like in the compensation spring 8 and the cavity 14. During the operation of the device, the spare lean oil pump is periodically purged every 2 days, and meanwhile, the purging work is carried out when the lean oil pump is started or switched to stop, through related maintenance, the average service life of the mechanical seal of the equipment is prolonged to more than 6 months, the inspection and maintenance frequency of the equipment is effectively reduced, and the service life of the mechanical seal is greatly prolonged.

In the embodiment, the specific connection mode of each mentioned part adopts conventional means such as bolts, rivets, welding and the like mature in the prior art, machines, parts and equipment adopt conventional models in the prior art, and circuit connection adopts a conventional connection mode in the prior art, and detailed description is omitted here.

The mechanical seal convenient to clean provided by the utility model is described in detail above, and a specific example is applied in the text to explain the principle and the implementation mode of the utility model, and the description of the above embodiment is only used to help understand the method and the core idea of the utility model; while the invention has been described with reference to specific embodiments and applications, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (9)

1. The utility model provides a mechanical seal convenient to it is clean, includes that axle sleeve (1), gland (5) and cooperation are sealed rotating ring (2) and quiet ring (3), gland (5) suit is on axle sleeve (1), rotating ring (2) are connected through power component with axle sleeve (1), quiet ring (3) are kept away from rotating ring (2) and are held to be connected its characterized in that through a plurality of compensating spring (8) and gland (5): the shaft sleeve (1), the gland (5), the static ring (3) and the moving ring (2) jointly enclose a chamber (14), at least two blowing holes (13) are formed in the gland (5), the blowing holes (13) are communicated with the chamber (14), and the compensating spring (8) is located in the chamber (14).

2. A mechanical seal to facilitate cleaning according to claim 1, wherein: the blowing holes (13) are positioned on the side wall of the gland (5).

3. A mechanical seal to facilitate cleaning according to claim 2, wherein: the number of the blowing holes (13) is two.

4. A mechanical seal to facilitate cleaning according to claim 3, wherein: the blowing hole (13) is divided into a drainage part (132) and a thread part (131), one end of the thread part (131) is communicated with the outside, one end of the drainage part (132) is communicated with the cavity (14), the diameter of the thread part (131) is larger than that of the drainage part (132), and threads are arranged on the inner wall of the thread part (131).

5. A mechanical seal to facilitate cleaning according to claim 4, wherein: and the threaded part (131) is detachably provided with a dust cover.

6. A mechanical seal to facilitate cleaning according to claim 1, wherein: o-shaped sealing rings (9) are arranged between the outer side of the static ring (3) and the gland (5) and between the outer side of the movable ring (2) and the shaft sleeve (1).

7. A mechanical seal to facilitate cleaning according to claim 1, wherein: still include transmission ring (7) and locating piece (6), transmission ring (7) suit outside axle sleeve (1) and with axle sleeve (1) fixed connection, transmission ring (7) are located axle sleeve (1) and keep away from the medium end, locating piece (6) and gland (5) fixed connection, the outside arch of lateral wall of transmission ring (7) forms the position circle, the lateral wall inside groove of locating piece (6) forms the second constant head tank with position circle matched with.

8. A mechanical seal to facilitate cleaning according to claim 1, wherein: the novel bearing is characterized by further comprising a push ring (4), a spring groove used for accommodating a compensation spring (8) is formed in the shaft sleeve (1), and the push ring (4) is located between the spring and the static ring (3).

9. A mechanical seal to facilitate cleaning according to claim 1, wherein: the power assembly comprises a power block, a clamping groove is formed in one end, located on a medium, of the shaft sleeve (1), the power block is arranged in the clamping groove, and a first positioning groove matched with the power block is formed in one end, far away from the static ring (3), of the movable ring (2).

Images