CN216767340U - Anti-falling structure for bolt on side door of blowout preventer - Google Patents

Abstract

The utility model belongs to the technical field of drilling equipment, and relates to a blowout preventer, in particular to a blowout preventer side door bolt anti-falling structure which comprises a blowout preventer shell, a middle flange and a side door which are sequentially arranged, wherein the blowout preventer shell, the middle flange and the side door are fixedly connected by means of bolts, each bolt comprises a threaded part rod and a polished rod, and the key is as follows: the blowout preventer shell is provided with a threaded hole matched with the threaded part rod, the middle flange and the side door are respectively provided with a first through hole and a second through hole matched with the polished rod, and the inner wall of the second through hole of the side door is provided with a section of female thread matched with the threaded part rod; set up female screw on side door second through-hole inner wall for the bolt is blockked by female screw, even the slope can not drop down yet.

Description

Anti-falling structure for bolt on side door of blowout preventer

Technical Field

The utility model belongs to the technical field of drilling equipment, relates to a blowout preventer, and particularly relates to a side door bolt anti-falling structure of the blowout preventer.

Background

The blowout preventer is a well mouth safety sealing device which is commonly used in oil fields and used for closing a well mouth in the operation processes of oil testing, well workover, well completion and the like, preventing blowout accidents and integrating full sealing and half sealing functions. The hydraulic blowout preventer mainly has two forms, namely a ram blowout preventer and an annular blowout preventer.

The side door of the ram blowout preventer is connected with the shell, the side door of the ram blowout preventer needs to be opened when the ram is replaced, the side door of the ram blowout preventer is usually connected with the shell through bolts, and the bolts are heavy and dangerous to fall. In order to prevent the bolt from falling off when the side door is lifted, an O-shaped ring made of rubber is usually arranged on the bolt, and when the bolt is opened, the bolt of the side door is prevented from falling off by utilizing a gap between a boss at the thread position of the bolt and a middle bolt hole; the anti-falling structure can achieve the anti-falling purpose only by matching the O-shaped ring with the bolt, and once the quantity or the model of the O-shaped ring is not matched with the quantity or the model of the bolt, the anti-falling structure loses the original function; and the O-shaped ring is made of soft material and is easy to fall off or be sheared by a shearing structure formed between the threads and the side door, so that the safety is poor, and the potential safety hazard that the bolt of the side door falls off at any time after long-time use exists.

Therefore, there is a need for a bolt drop prevention structure that can prevent a bolt from dropping without the need for external components.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the utility model provides a blowout preventer side door bolt anti-falling structure, which can enable a bolt to be blocked by a female thread by arranging a section of female thread in a second through hole of a side door, and the bolt cannot fall off even if the bolt inclines downwards.

In order to solve the technical problems, the technical scheme adopted by the utility model is as follows: preventer side door bolt anti falling structure, including preventer casing, middle flange and the side door that sets gradually, and the three is with the help of bolt fixed connection, the bolt includes screw thread portion pole and polished rod, and the key is: the blowout preventer shell is provided with a threaded hole matched with the threaded portion rod, the middle flange and the side door are respectively provided with a first through hole and a second through hole matched with the polished rod, and the inner wall of the second through hole of the side door is provided with a section of female thread matched with the threaded portion rod.

When the side door slope was downward, the bolt can be blockked by female screw, prevents that the bolt gliding from dropping.

Preferably, the thickness of the intermediate flange is greater than or equal to the length of the threaded part rod.

Preferably, the length of the female thread is greater than or equal to 25 mm.

The utility model has the beneficial effects that: when the side door is lifted, the bolt is not horizontal but inclined downwards, in the prior art, an O-shaped ring is sleeved on the bolt and can be clamped between a bolt hole of a middle flange and bolt threads, so that the bolt is prevented from sliding downwards; however, each bolt is required to be provided with an O-shaped ring, and the O-shaped ring is required to be of the same size, so that the whole side door cannot form an anti-falling structure when the O-shaped ring is lost; the O-shaped ring is made of soft materials, is easy to fall off or is sheared by a shearing structure formed between the threads and the side door, the safety is poor, and the potential safety hazard that the bolt of the side door falls off at any time exists after long-time use, so that the work is hindered; this technical scheme adopts and sets up female screw on the downthehole wall of side door second through-hole for the bolt is blockked by female screw, even slope also can not drop downwards.

Drawings

FIG. 1 is a schematic view of an anti-falling structure of an O-ring in the prior art;

FIG. 2 is a schematic diagram of the overall structure of the blowout preventer in the embodiment;

FIG. 3 is a partially enlarged view of the opened state of the bolt of the portion A in the embodiment;

FIG. 4 is a schematic structural view showing a state where a side door is lifted in the embodiment;

in the figure: 1 represents a blowout preventer housing; 101 represents a threaded hole; 2 represents an intermediate flange; 201 denotes a first via; 3 represents a side door; 301 represents a second via; 4 represents a bolt; 401 represents a threaded section; 402 represents a polish rod; 5 represents a female thread; 6 represents a sling; and 7 represents an O-ring.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

As shown in fig. 1, in the anti-dropping structure in the prior art, an O-ring 7 is sleeved on a bolt 4, and when the side door 3 is lifted, the O-ring 7 is clamped in a gap between a threaded part rod 401 and a first through hole 201 to prevent the bolt 4 from sliding downwards; however, because the O-ring 7 is small, the O-ring is very easy to lose or fall off when being carried or placed alone, and due to the material, the O-ring 7 is easy to fall off or is sheared by a shearing structure formed between the thread and the side door, so that the O-ring 7 loses the original blocking effect when being lifted, and the bolt 4 falls off from the second through hole 301 of the side door 3.

Concrete embodiment is shown in fig. 2, 3 and 4, blowout preventer side door bolt anti-drop structure, including blowout preventer casing 1, middle flange 2 and the side door 3 that sets gradually, and the three is with the help of bolt 4 fixed connection, and bolt 4 includes screw portion pole 401 and polished rod 402, and the key is: the blowout preventer shell 1 is provided with a threaded hole 101 matched with a threaded part rod 401, the middle flange 2 and the side door 3 are respectively provided with a first through hole 201 and a second through hole 301 matched with the polished rod 402, and the inner wall of the second through hole 301 of the side door 3 is provided with a section of female thread 5 matched with the threaded part rod 401.

According to the technical scheme, an O-shaped ring is not needed any more, the female thread 5 is processed in the second through hole 301 of the side door 3, the female thread 5 is preferably arranged at one end close to the middle flange 2, the length of the female thread 5 is more than or equal to 25mm, the female thread 5 can be matched with the thread on the outer surface of the threaded part rod 401 to limit the bolt 4, and the bolt is prevented from falling; the thickness of the middle flange 2 is larger than or equal to the length of the thread part rod 401, so that the bolt 4 can conveniently enter and exit. When staff transported side door and other preventer accessories, the screw thread of screw thread portion pole 401 formed threaded connection with female screw thread 5, blockked dropping of bolt 4, did not need additionally to carry O type circle, and female screw thread 5 obtains according to 4 size cooperation processing of bolt, has avoided O type circle size nonconformity scheduling problem to long service life is difficult to appear the accident of lifting by crane the in-process landing, and it is more convenient that processing is lifted by crane.

It should be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the utility model and are not to be construed as limiting the utility model. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.

Claims (3)

1. Blowout preventer side door bolt anti falling structure, including blowout preventer casing (1), middle flange (2) and side door (3) that set gradually, and the three is with the help of bolt (4) fixed connection, bolt (4) are including screw thread portion pole (401) and polished rod (402), its characterized in that: offer on preventer casing (1) with screw portion branch pole (401) complex screw hole (101), seted up respectively on intermediate flange (2) and side door (3) with polished rod (402) complex first through-hole (201) and second through-hole (301), set up one section on second through-hole (301) inner wall of side door (3) and screw portion branch pole (401) complex female thread (5).

2. The blowout preventer side door bolt anti-drop structure of claim 1, wherein: the thickness of the middle flange (2) is larger than or equal to the length of the threaded part rod (401).

3. The blowout preventer side door bolt anti-drop structure of claim 1, wherein: the length of the female thread (5) is more than or equal to 25 mm.

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