CN212959070U - Sealing device for high-pressure plunger water injection pump packing of offshore oil platform - Google Patents

Abstract

The utility model provides a sealing device for offshore oil platform high pressure plunger water injection pump packing, establish the packing box on the plunger including the cover, it is inherent in the space between packing box and the plunger upwards in proper order from the medium direction on the plunger to overlap and be equipped with decompression bottom ring, V type ring group, clamping ring, packing seal group and end cover, the V type opening of V type ring group is towards the medium side, the decompression bottom ring V type ring group the clamping ring with the sealed internal diameter of organizing of packing with the external diameter of plunger agrees with mutually. In the utility model, the V-shaped ring is enlarged because the opening of the V-shaped ring is towards the medium side, thereby buffering the pressure from the medium; silica gel core packing replaces spring box compensation system from taking silica gel core structure, provides the sealed compensation power that lasts, has greatly reduced the complexity of installation.

Description

Sealing device for high-pressure plunger water injection pump packing of offshore oil platform

Technical Field

The utility model relates to a technical field of offshore oil platform high pressure plunger water injection pump, more specifically relates to a sealing device for offshore oil platform high pressure plunger water injection pump packing.

Background

The high-pressure plunger water injection pump is used as key equipment of an offshore oil platform. In oil and gas field exploitation, water injection exploitation is a common process, and the specific mode is that water is injected into an oil reservoir through a water injection well after being injected and pressurized by a water injection pump, so that the pressure of the oil reservoir is maintained or recovered, the oil reservoir has strong driving force, and the exploitation speed and the recovery ratio of the oil reservoir are improved. Therefore, the water injection system is the basic guarantee of stable production of the oil field, the water injection pump is the heart of the water injection system, and the good running state of the water injection pump can ensure normal production operation on the platform, so that the potential safety hazard in the transfer of the high-pressure plunger water injection pump is eliminated, and the safe and stable running of the water injection pump is ensured.

At present, a high-pressure plunger water injection pump is mainly sealed in a packing sealing mode. Packing (packing), also called sealing packing, is usually woven from softer threads, and strips, usually square or rectangular or circular in cross-section, are filled in a sealing cavity to achieve sealing. The stuffing seal is firstly to prevent the liquid flow from leaking by the fiber plug such as cotton and hemp in the leakage passage, and is mainly used as the shaft seal of the water lifting machine. Packing is widely used for the shaft seal of centrifugal pumps, compressors, vacuum pumps, blenders and ship propellers, the reciprocating shaft seal of piston pumps, reciprocating compressors and refrigerators, the rotary seal of various valve stems and the like. Due to the limitations of the design and the working condition of the high-pressure plunger water injection pump, the high failure rate of the high-pressure plunger water injection pump of the offshore oil platform is a normal state, and the used common packing seal cannot meet the operation and use requirements of the high-pressure plunger water injection pump in the form.

The sealing mode of a high-pressure plunger water injection pump in the prior art is shown in fig. 2, and the sealing mode mainly has the following problems:

firstly, due to the increase of medium pressure in operation, the compression amount needs to be compressed more tightly, and the compression is too tight, so that the friction between a piston and a packing is increased, and the existing sealing structure has no auxiliary lubrication and only carries out lubrication and cooling through reasonable leakage amount. When the unit is operated for a long time to cause high temperature at the parts such as the plunger and the like, a small amount of leakage amount cannot meet the cooling and lubricating effects, and after the unit is operated for a period of time, the packing can be carbonized and solidified without compression amount, so that the sealing effect cannot be achieved.

Secondly, after the packing operates for a period of time, high temperature makes the packing expand, and density reduces, and the unit operation is in the operation in-process, and the packing bears the impact load when compressing for a long time, causes the packing fatigue, and the packing structure damage will appear for a long time, causes the plunger to puncture.

In addition, in the prior art, the two adjacent packing sets are buffered by lead pads, a spring box compensation system consisting of a guide spring seat, a spring and a spring base which are sequentially arranged is adopted to provide compensation force, and the packing set has the advantages of complex structure, high cost and easiness in loss.

Meanwhile, rotary seal and reciprocating seal packing bear large pressure, the moving directions are different, and the packing is extruded and deformed to cause the motion trail of the piston to change, so that the abrasion of the piston is aggravated, the abrasion of the piston is greatly increased, and the piston is prematurely scrapped.

In addition, the water injection pressure of high pressure plunger water injection pump is high, and the temperature is high, and the water injection of thorn leaks can be sealed the entering crankcase through the tappet, causes the emulsification of crankcase lubricating oil, causes equipment failure.

Therefore, a technical scheme capable of solving the problem of frequent sealing leakage of the high-pressure plunger water injection pump is urgently needed in the prior art.

SUMMERY OF THE UTILITY MODEL

The utility model provides a to the not enough of above-mentioned prior art, the utility model provides a sealing device for offshore oil platform high pressure plunger water injection pump packing.

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes:

the utility model provides a sealing device for offshore oil platform high pressure plunger water injection pump packing, establishes the packing box on the plunger including the cover, it is inherent in the space between packing box and the plunger upwards overlap in proper order from the medium direction on the plunger and be equipped with decompression end ring, V type ring group, clamping ring, the sealed group of packing and end cover, the V type opening of V type ring group is towards the medium side, the decompression end ring the V type ring group the clamping ring with the sealed internal diameter of organizing of packing with the external diameter of plunger agrees with mutually.

And the contact surfaces of the end cover and the packing box are provided with sealing glue, and the inner side of the end cover is tightly attached to the plunger.

The top of the pressure reducing bottom ring is provided with a V-shaped bulge.

And a V-shaped groove is formed in the bottom of the compression ring.

The V-ring set includes at least two stages of V-rings.

The packing seal assembly comprises at least two silica gel core packing.

Compared with the prior art, the utility model beneficial effect be: the pressure reducing bottom ring can buffer the pressure from the medium; when the pressure increases, the V-ring increases because of its opening toward the medium side, thereby buffering the pressure from the medium; the compression ring can keep the V-shaped ring under continuous pressure, the V-shaped ring is initially sealed and decompressed, the silica gel core is provided with a silica gel core structure, a spring box compensation system in the prior art is replaced, continuous sealing compensation force is provided, the installation complexity is greatly reduced, and the service life of the sealing device is prolonged; the V-shaped ring made of the modified polytetrafluoroethylene material has higher elastoplasticity, followability, wear resistance and temperature resistance; and the structure of the multistage sealing ring is convenient to disassemble.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural diagram of a packing device in the prior art.

Reference numerals: 101-decompression bottom ring, 102-V-shaped ring set, 103-compression ring, 104-packing seal set, 105-end cover, 106-packing box, 1-plunger, 2-packing box gland, 3-gland bush, 4-packing, 5-lead gasket, 6-locating sleeve, 7-guide spring seat, 8-spring, 9-spring base, 10-packing box, 11-packing box flange, 12-lifting ring, 13-rectangular sealing ring, 14-stud bolt and 15-hexagon nut.

Detailed Description

The invention will be further elucidated below on the basis of a specific embodiment.

The sealing device for the offshore oil platform high-pressure plunger water injection pump packing comprises a packing box 106 sleeved on a plunger 1, wherein a pressure reducing bottom ring 101, a V-shaped ring set 102, a pressure ring 103, a packing sealing set 104 and an end cover 105 are sequentially sleeved on the plunger 1 from the medium direction upwards in a gap between the packing box 106 and the plunger 1, a V-shaped opening of the V-shaped ring set 102 faces the medium side, and the inner diameters of the pressure reducing bottom ring 101, the V-shaped ring set 102, the pressure ring 103 and the packing sealing set 104 are matched with the outer diameter of the plunger 1. And sealing glue is arranged on the contact surfaces of the end cover 105 and the packing box 106, and the inner side of the end cover 105 is tightly attached to the plunger 1, so that the end cover 105 and the packing box 106 are sealed. The top of the pressure reducing bottom ring 101 is provided with a V-shaped bulge. The bottom of the pressing ring 103 is provided with a V-shaped groove. V-ring set 102 includes at least two V-rings, which in this embodiment have seven stages. The first V-shaped ring fits with the decompression bottom ring 101, and the last V-shaped ring fits with the compression ring 103. The packing set 104 includes at least two silica gel core packings, four silica gel core packings in this embodiment. In the embodiment, the pressure reducing bottom ring 101 is made of phosphor copper, the V-shaped ring is made of modified polytetrafluoroethylene, the modified polytetrafluoroethylene has certain elastic plasticity, and when the filler is axially compressed, the filler has certain compensation capacity, namely good following performance; the lubricating oil has stable chemical properties, is not easy to be corroded and swelled by a medium, is not easy to pollute the medium, has good self-lubricating property and small friction coefficient, and can bear certain temperature after being heated by friction.

When a water injection pump performs water injection mining work, a high-pressure plunger of the water injection pump receives an impact load from a medium side for a long time. The decompression bottom ring 101 bears the medium pressure firstly, the first stage of the V-shaped ring is tightly attached and matched with the V-shaped bulge of the decompression bottom ring 101, and the multi-stage V-shaped rings are tightly attached step by step to reduce the medium pressure. The elasticity of V type ring is good, because V type mouth is towards decompression bottom ring 101, when bearing medium pressure, V type mouth opening can increase, and medium pressure can be alleviateed to V type ring group 102 that multistage V type ring constitutes to play preliminary sealed effect. The packing seal assembly 104 composed of multiple stages of silica gel core packing can replace a spring box compensation system in the prior art, and when the packing seal assembly bears pressure from a medium side, a silica gel core carried in the silica gel core packing can provide continuous compensation force. The end cover 105 seals the packing box 106, when the V-shaped ring set 102 and the packing seal set 104 move upwards, the end cover 105 can press the packing seal set 104, and the sealing effect of the sealing device is further guaranteed.

The above description is only the preferred embodiment of the present invention, but the present invention is not limited to the above-mentioned specific embodiments, and for those skilled in the art, a plurality of modifications and improvements can be made without departing from the inventive concept of the present invention, and these modifications and improvements all belong to the protection scope of the present invention.

Claims (6)

1. The utility model provides a sealing device for offshore oil platform high pressure plunger water injection pump packing, establishes packing box (106) on plunger (1) including the cover, characterized by, packing box (106) with it is interior in the space between plunger (1) upwards overlap in proper order from the medium direction on plunger (1) and be equipped with decompression end ring (101), V type ring group (102), clamping ring (103), packing seal group (104) and end cover (105), the V type opening of V type ring group (102) is towards the medium side, decompression end ring (101) V type ring group (102) clamping ring (103) with the internal diameter of packing seal group (104) with the external diameter of plunger (1) agrees with mutually.

2. The sealing device for the offshore oil platform high-pressure plunger water injection pump packing according to claim 1, characterized in that a sealing glue is arranged on the contact surface of the end cover (105) and the packing box (106), and the inner side of the end cover (105) is tightly attached to the plunger (1).

3. The sealing device for the offshore oil platform high-pressure plunger water injection pump packing according to claim 1, wherein a V-shaped bulge is arranged at the top of the pressure reducing bottom ring (101).

4. The sealing device for the offshore oil platform high-pressure plunger water injection pump packing according to claim 1, characterized in that a V-shaped groove is formed at the bottom of the compression ring (103).

5. The sealing device for the offshore oil platform high pressure plunger water injection pump packing set of claim 1, wherein the V-ring set (102) comprises at least two stages of V-rings.

6. The sealing device for the offshore oil platform high-pressure plunger water injection pump packing set according to claim 1, wherein the packing set (104) comprises at least two silica gel core packing sets.

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