CN211224665U

CN211224665U - External thread protector and internal thread protector

Info

Publication number: CN211224665U
Application number: CN201921579731.0U
Authority: CN
Inventors: 陆耕深; 陆晔
Original assignee: Zhejiang Tianyi Machinery Co ltd
Current assignee: Zhejiang Tianyi Machinery Co ltd
Priority date: 2019-09-20
Filing date: 2019-09-20
Publication date: 2020-08-11
Anticipated expiration: 2029-09-20

Abstract

The utility model discloses an external screw thread protector, include: the first protector body is used for protecting the external threads of the pipe-shaped piece to prevent the external threads from being collided by the outside, and a first groove is formed in the inner side wall of the first end of the first protector body; a first seal for sealing against the external threads, the first seal comprising: a first embedding part embedded in the first groove; a first covering part covering the end surface of the first end; the first connecting part is used for being in contact with the outer side wall of the pipe type piece in a fitting mode so as to seal the external thread. Compare directly inlay the rubber packing ring on locating steel pipe shell's lateral wall among the prior art, the utility model discloses a first cladding portion has improved first sealing member and this body coupling's of first protector fastness, makes first sealing member be difficult for droing. The utility model also discloses an internal thread protector has improved the fastness that protector body and sealing member are connected, makes the sealing member be difficult to drop from the protector body.

Description

External thread protector and internal thread protector

Technical Field

The utility model relates to a cast screw thread protection device technical field, more specifically say, relate to an external screw thread protector. Furthermore, the utility model discloses still relate to an internal thread protector.

Background

The thread protector is used as a protective device for preventing threads from being damaged by collision and preventing the threads from entering water vapor to be corroded, and has wide application in the production and transportation processes of oil well pipes.

Thread protectors of the prior art typically use a combination of a threaded steel pipe housing and a storage grease to protect the threads of each fuel saving well pipe. That is to say, before the steel pipe shell is tightened, firstly, a layer of special storage grease is pre-brushed on the threads of the steel pipe shell, then the steel pipe shell is screwed, at the moment, the thread gaps of the oil well pipe are filled with the storage grease, so that water vapor and the like can not enter, the thread corrosion and the like of the oil well pipe can be avoided, and meanwhile, the steel pipe shell can avoid the collision damage and the like caused by foreign objects to the threads of the oil well pipe.

However, in the above-described manner of protecting the threads of the oil well pipes, when the oil well pipes are threaded together before being lowered into the well in the oil field, the operation is troublesome, and it is necessary to first remove the steel pipe casing, then remove the stored grease attached to the threads of the oil well pipes, then apply the special threaded grease, and finally perform the threaded connection operation of the oil well pipes, which causes inconvenience in the pipeline connection.

Therefore, the mode that adopts steel pipe shell to add the rubber packing ring has appeared on the existing market, utilizes the elasticity performance of rubber packing ring, guarantees the leakproofness of steel pipe shell oil well pipe screw thread after fastening, and the rubber packing ring sets up the one end that corresponds oil well pipe screw thread on steel pipe shell nearest to the external world usually to avoid steam etc. to get into in the screw thread from this end of steel pipe shell.

However, in the prior art, since the rubber gasket is directly embedded in the side wall of the steel pipe shell, a large extrusion force is generated on the rubber seal ring in the process of screwing the steel pipe shell, so that the rubber seal ring embedded in the steel pipe shell is easily extruded and deformed, and the risk that the rubber seal ring is separated from the original position exists, so that the thread of the oil well pipe cannot be completely sealed. At this moment, need to lift off the external screw thread protector again, overlap the rubber packing ring again, tighten with suitable power again, repeated operation brings the inconvenience for the installation of external screw thread protector.

In summary, it is an urgent need to solve the problem of providing a thread protector that prevents a seal ring from falling off.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing an external screw thread protector has improved the fastness that protector body and sealing member are connected, makes the sealing member be difficult to drop from the protector body.

Another object of the utility model is to provide an internal thread protector has improved the fastness that protector body and sealing member are connected, makes the sealing member be difficult to drop from the protector body.

In order to achieve the above object, the present invention provides the following technical solutions:

an external thread protector comprising:

the first protector body is used for protecting the external threads of the pipe-shaped piece from being collided by the outside, and a first groove is formed in the inner side wall of the first end of the first protector body;

a first seal for sealing against the external thread, the first seal comprising:

the first embedding part is embedded in the first groove;

a first covering part covering the end surface of the first end;

and the first connecting part is used for being in fit contact with the outer side wall of the pipe fitting to seal the external thread.

Preferably, the first embedding portion is disposed obliquely toward the first wrapping portion.

Preferably, the first connecting portion is provided with at least two first toothed rings towards one side of the outer side wall of the tubular part.

Preferably, the first seal further comprises an everted portion connected to the first cladding portion for cladding an outer sidewall of the first end.

Preferably, the outer side wall of the first end is provided with a sunken groove for accommodating the outward turning part, and the side wall of the sunken groove is abutted to the end face of the outward turning part in a fit manner.

Preferably, the second end of first protector body is equipped with the second recess, the tank bottom width of second recess is greater than the notch width of second recess, the embedded second sealing member that has elasticity that is equipped with of second recess.

Preferably, the second seal comprises:

a second embedding part embedded in the second groove;

and the second sealing part is connected with the second embedding part and is used for being in contact with the end surface of the pipe-shaped part in a fitting manner, and the second sealing part is a truncated conical surface.

An internal thread protector comprising:

the second protector body is used for protecting the internal thread of the pipe-shaped piece to prevent the internal thread from being collided by the outside, and the outer side wall of the first end of the second protector body is provided with a third groove and a step end face which is used for being arranged opposite to the end face of the pipe-shaped piece;

a third seal for sealing the internal threads, the third seal comprising:

a third embedding part embedded in the third groove;

the third coating part is coated on the end face of the step, and the side face of the third coating part is used for being in contact with the end face of the pipe-shaped piece in a fitting mode so as to seal the internal thread;

a third connecting portion connecting the third embedded portion and the third coated portion.

Preferably, the side surface of the third coating part is provided with at least two second toothed rings for being in contact with the end surface of the tubular part.

Preferably, a fourth groove is formed in the outer side wall of the second end of the second protector body; further comprising a fourth seal for sealing the internal thread, the fourth seal comprising:

a fourth embedding part embedded in the fourth groove;

a fourth cladding part cladding the end surface of the second end;

and the fourth connecting part is used for being in fit contact with the inner side wall of the pipe-shaped piece to seal the internal thread.

The utility model provides an external thread protector, when using, can protect the external thread of pipe type spare through the first protector body, avoid the external thread to be collided and damaged by the external world, etc.; simultaneously, play sealed effect through first sealing member to the external screw thread of cast, avoid steam etc. to get into the gap of external screw thread from the one end of external screw thread, cause the external screw thread corrosion etc. of cast.

In addition, compare directly with the rubber packing ring inlay locate steel pipe shell's lateral wall among the prior art on, the utility model provides a first sealing member inlays through first embedding portion and locates in the first recess of the first end of first protector body, and the cladding of first cladding portion is in the terminal surface of the first end of first protector body, and the terminal surface of the first end of first protector body plays the backstop effect to first cladding portion, makes first cladding portion and first embedding portion pin down each other to can make first sealing member and the fixed more firm of first protector body, avoid first sealing member to drop from first protector body easily. Simultaneously, compare in prior art, first connecting portion have increased the area that first sealing member participated in sealed, and sealed effect is better, the external screw thread of protection pipe type spare that can be better.

The utility model provides an internal thread protector, when using, can protect the internal thread of pipe type spare through the second protector body, avoid the internal thread to be collided and damaged etc. by the external world; simultaneously, play sealed effect through the internal thread of third sealing member to the cast, avoid steam etc. to get into the internal thread gap from the one end of internal thread, cause the internal thread corrosion etc. of cast.

In addition, compare and inlay the rubber packing ring on locating steel pipe shell's lateral wall among the prior art, the utility model provides a third sealing member inlays through third embedding portion and locates in the third recess of the first end of second protector body, and the cladding of third cladding portion in the step terminal surface of the first end of second protector body, the step terminal surface of the second end of second protector body plays the backstop effect to third cladding portion, makes third cladding portion and third embedding portion hold down each other to can make third sealing member and the fixed more firm of second protector body, avoid the third sealing member to drop from the second protector body easily.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a cross-sectional view of an external thread protector according to an embodiment of the present invention;

fig. 2 is a cross-sectional view of the first protector body of fig. 1;

FIG. 3 is an enlarged view of a portion of FIG. 2;

FIG. 4 is a schematic view of the first seal of FIG. 1;

FIG. 5 is a cross-sectional view of FIG. 4;

FIG. 6 is a partial enlarged view of B in FIG. 5;

FIG. 7 is a schematic view of the second seal of FIG. 1;

FIG. 8 is a cross-sectional view of FIG. 7;

fig. 9 is a schematic structural diagram of an internal thread protector according to an embodiment of the present invention;

fig. 10 is a cross-sectional view of the second protector body of fig. 9;

FIG. 11 is a schematic view of the third seal of FIG. 9;

FIG. 12 is a cross-sectional view of FIG. 11;

FIG. 13 is an enlarged view of a portion C of FIG. 12;

FIG. 14 is a schematic view of the fourth seal of FIG. 9;

FIG. 15 is a cross-sectional view of FIG. 14;

fig. 16 is a partial enlarged view of D in fig. 15.

The reference numerals in fig. 1 to 16 are as follows:

the first protector body 1, the first internal thread 11, the first groove 12, the counter sink 13, the second groove 14, the first seal 2, the first insert 21, the first cover 22, the first connection portion 23, the first ring gear 231, the outward turned portion 24, the second seal 3, the second insert 31, the second seal 32, the second protector body 4, the second external thread 41, the third groove 42, the stepped end surface 43, the fourth groove 44, the third seal 5, the third insert 51, the third cover 52, the second ring gear 521, the connection portion 53, the fourth seal 6, the fourth insert 61, the fourth insert 62, and the fourth connection portion 63.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The core of the utility model is to provide an external screw thread protector and internal thread protector to improve the fastness that protector body and sealing member are connected, make the sealing member be difficult to drop from the protector body.

For example, for convenience of description, the protector body corresponding to the external thread protector is referred to as a first protector body, and the protector body corresponding to the internal thread protector is referred to as a second protector body. That is, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.

Referring to fig. 1 to 8, fig. 1 is a sectional view of an external thread protector according to an embodiment of the present invention; fig. 2 is a cross-sectional view of the first protector body of fig. 1; FIG. 3 is an enlarged view of a portion of FIG. 2; FIG. 4 is a schematic view of the first seal of FIG. 1; FIG. 5 is a cross-sectional view of FIG. 4; FIG. 6 is a partial enlarged view of B in FIG. 5; FIG. 7 is a schematic view of the second seal of FIG. 1; fig. 8 is a cross-sectional view of fig. 7.

The utility model provides an external thread protector, which comprises a first protector body 1 and a first sealing element 2, wherein the first protector body 1 is used for protecting the external thread of a pipe type element so as to avoid the external thread of the pipe type element from being collided and the like; first sealing member 2 is located the first end of first protector body 1 for the external screw thread of sealed pipe type spare avoids in steam etc. gets into the external screw thread, causes the external screw thread corrosion etc. of pipe type spare.

It should be noted that the main structure of the first protector body 1 is the same as that of the external thread protector in the prior art, and the description thereof is omitted.

It can be understood that the inner side wall of the first protector body 1 is provided with a first internal thread 11 for matching with the external thread of the pipe-shaped piece, when the protector is installed, the first internal thread 11 of the first protector body 1 is screwed with the external thread of the pipe-shaped piece, so that the external thread of the pipe-shaped piece can be prevented from being exposed, and the external thread can be prevented from being damaged by collision; when the protector is detached, the first internal thread 11 of the first protector body 1 is directly screwed out from the external thread of the pipe-shaped piece.

The first end of the first protector body 1 refers to an end of the first protector body 1, which is closest to the outside corresponding to the external thread of the pipe-shaped member after the pipe-shaped member is assembled with the first protector body.

In general, for easy guidance during installation, the radial dimension of the first internal thread 11 is generally gradually increased from one end to the other end, that is, the two ends of the first protector body 1 are a large diameter end and a small diameter end, respectively, and in this case, the first end of the first protector body 1 is referred to as a large diameter end.

The utility model discloses a main improvement lies in the structure of first sealing member 2 and the connection structure of first sealing member 2 and first protector body 1 to guarantee the fastness that first sealing member 2 and first protector body 1 are connected, avoid the in-process of going up to the cast spare at the external thread protector, first sealing member 2 drops from first protector body 1.

Specifically, as shown in fig. 4 to 6, the first sealing element 2 includes a first embedding portion 21, a first wrapping portion 22 and a first connecting portion 23, the first embedding portion 21 is configured to be embedded in an inner side wall of the first protector body 1, as shown in fig. 2 and 3, the inner side wall of the first end of the first protector body 1 is provided with a first groove 12, and when the first sealing element 2 is installed, the first embedding portion 21 is embedded in the first groove 12, so as to realize the fixed connection between the first sealing element 2 and the first protector body 1.

First cladding portion 22 is used for the cladding in the terminal surface of the first end of first protector body 1, install first sealing member 2 back to first protector body 1, first cladding portion 22 offsets with the terminal surface laminating of the first end of first protector body 1, the terminal surface of the first end of first protector body 1 plays backstop effect to first cladding portion 22, make first cladding portion 22 and first embedding portion 21 hold down each other, thereby can make first sealing member 2 and first protector body 1 fixed more firm, avoid first sealing member 2 to drop from first protector body 1 easily.

The first connecting portion 23 is provided between the first embedding portion 21 and the first wrapping portion 22, so that the first embedding portion 21 and the first wrapping portion 22 are connected together by the first connecting portion 23. Meanwhile, the first connecting portion 23 is mainly used for fitting or pressing contact with the outer side wall of the pipe-shaped member to seal the external thread of the pipe-shaped member.

Therefore, compared with the prior art that the rubber gasket is directly embedded on the side wall of the steel pipe shell, the first cladding part 22 of the utility model improves the connection firmness of the first sealing element 2 and the first protector body 1, so that the first sealing element 2 is not easy to fall off; simultaneously, compare in prior art, first connecting portion 23 has increased the area that first sealing member 2 participated in sealed, and sealed effect is better, the external screw thread of protection pipe type spare that can be better.

It is to be understood that, since the end surface of the first end of the first protector body 1 is disposed perpendicular to the inner side wall of the first end, it is preferable that the first clad portion 22 is disposed perpendicular to the first connection portion 23.

In order to avoid that the end surface of the first end of the first protector body 1 and the corner of the inner side wall thereof cause sharp-angled extrusion to the first sealing element 2, preferably, the end surface of the first end of the first protector body 1 and the corner of the inner side wall thereof are provided with chamfers, and correspondingly, the joint of the first cladding portion 22 and the first connecting portion 23 is provided with a chamfer.

As shown in fig. 6, in order to further improve the firmness of the connection between the first seal member 2 and the first protector body 1, in addition to the above-described embodiment, the first embedding portion 21 is provided obliquely toward the first covering portion 22.

That is, the first embedding portion 21 and the first wrapping portion 22 are not disposed in parallel, and there is a certain angle between the extension lines thereof, in other words, the first embedding portion 21 is not directly embedded in the inner side wall of the first protector body 1 in the direction perpendicular to the inner side wall of the first protector body 1, but is embedded in the inner side wall of the first protector body 1 obliquely toward the end surface of the first end of the first protector body 1, that is, correspondingly, the first groove 12 is disposed obliquely toward the end surface of the first end of the first protector body 1, as shown in fig. 3.

This can improve the mutual restraining action of the first embedding portion 21 and the first covering portion 22 after the first seal member 2 is mounted in place, making it less likely that the first seal member 2 will be detached from the first protector body 1 by the pressing force.

In the present embodiment, the inclination angle of the first embedding portion 21 is not particularly limited, and preferably, the included angle between the first embedding portion 21 and the first connecting portion 23 ranges from 30 ° to 80 °, for example, the included angle therebetween may be 45 ° or 60 °.

As shown in fig. 6, in order to improve the sealing performance of the first seal 2, on the basis of the above embodiments, the first connection portion 23 is provided with at least two first rings 231 toward the side of the outer side wall of the pipe.

That is, the present embodiment improves the sealing performance of the first seal member 2 by providing the first ring gear 231, which protrudes from the surface of the first connection portion 23, on the sealing surface of the first connection portion 23. It can be understood that more than two first tooth rings 231 can form a mechanical labyrinth seal structure, and the sealing stroke and the sealing area are increased, so that the sealing effect is better, and water vapor and the like are less likely to enter the gap of the external thread of the pipe fitting from the first end of the first protector body 1.

It should be noted that, in this embodiment, the specific shape of the cross section of the first toothed ring 231 is not limited, and the cross section of the first toothed ring 231 may be rectangular, circular, or trapezoidal.

Preferably, the first ring gear 231 has an angle with the sealing surface of the first connection portion 23, and specifically, the first ring gear 231 is disposed obliquely toward the first internal thread 11.

As shown in fig. 6, in order to further improve the firmness of the connection between the first sealing member 2 and the first protector body 1, on the basis of any of the above embodiments, the first sealing member 2 further comprises an everted portion 24 connected to the first covering portion 22, and the everted portion 24 is used for covering the outer side wall of the first end of the first protector body 1.

It will be appreciated that the first seal member 2 is less likely to be disengaged from the first protector body 1 under the restraining action of the eversion portion 24.

As shown in fig. 2 and 3, in order to further improve the sealing effect of the first sealing element 2, on the basis of the above embodiment, the outer side wall of the end of the first protector body 1 is provided with a sunken groove 13 for accommodating the outward turned part 24, and the side wall of the sunken groove 13 abuts against the end surface of the outward turned part 24.

That is, the outer side wall of the first end of the first protector body 1 and the sinking groove 13 form a step-shaped structure, and the end surface of the outward turned part 24 abuts against the side wall of the sinking groove 13, so that foreign objects are prevented from being scraped to the end surface of the outward turned part 24, and the first sealing element 2 is prevented from easily falling off.

In order to improve the sealing effect on the external thread of the pipe fitting and prevent moisture and the like from entering the gap of the external thread from the other side of the external thread, a second sealing element 3 is usually arranged at the second end of the first protector body 1, as shown in fig. 1, the second sealing element 3 is positioned at the other side of the first internal thread 11, and in consideration of the fixing firmness of the second sealing element 3 and the first protector body 1, on the basis of the above embodiment, the second end of the first protector body 1 is provided with a second groove 14, the groove bottom width of the second groove 14 is greater than the notch width of the second groove 14, and the second groove 14 is embedded with the second sealing element 3 with elasticity.

That is, the inner space of the second groove 14 in the present embodiment is not equal in width from the groove bottom to the notch, but is a tapered structure that tapers from the groove bottom to the notch, for example, as shown in fig. 2, the cross section of the second groove 14 is a trapezoid, the bottom side of the trapezoid corresponds to the groove bottom of the cross section of the second groove 14, the top side of the trapezoid corresponds to the notch of the cross section of the second groove 14, and the length of the bottom side of the trapezoid is greater than the length of the second end of the trapezoid.

The second sealing member 3 has elasticity, for example, the second sealing member 3 is a rubber or other elastic solid sealing member, so as to be able to be inserted into the second groove 14, so that the second sealing member 3 is fixed more firmly, and the second sealing member 3 is prevented from easily falling off from the first protector body 1.

In view of the specific structure of the second sealing member 3, as shown in fig. 7 and 8, on the basis of the above-described embodiment, the second sealing member 3 includes the second embedding portion 31 and the second sealing portion 32, and the second embedding portion 31 is configured to be embedded in the second groove 14, and it is understood that the shape of the second embedding portion 31 corresponds to the shape of the second groove 14. The second sealing portion 32 is connected to the second embedding portion 31, and the second sealing portion 32 is used for contacting with the end face of the pipe-shaped member in an attaching manner, so that the end face of the pipe-shaped member is sealed, and water vapor is prevented from entering the gap of the external thread from the second end of the external thread of the pipe-shaped member from the end face of the pipe-shaped member.

For better sealing of the end faces of the pipe-shaped element, the second sealing portion 32 is a frustoconical surface.

Referring to fig. 9-16, fig. 9 is a schematic structural view of an internal thread protector according to an embodiment of the present invention; fig. 10 is a cross-sectional view of the second protector body of fig. 9; FIG. 11 is a schematic view of the third seal of FIG. 9; FIG. 12 is a cross-sectional view of FIG. 11; FIG. 13 is an enlarged view of a portion C of FIG. 12; FIG. 14 is a schematic view of the fourth seal of FIG. 9; FIG. 15 is a cross-sectional view of FIG. 14; fig. 16 is a partial enlarged view of D in fig. 15.

Besides the external thread protector, the utility model also provides an internal thread protector, which comprises a second protector body 4 and a third sealing element 5, wherein the second protector body 4 is used for protecting the internal thread of the pipe-shaped element so as to avoid the external collision and the like on the internal thread of the pipe-shaped element; third sealing member 5 locates the first end of second protector body 4 for the internal thread of sealed pipe type spare avoids steam etc. to get into in the internal thread, causes the internal thread corrosion etc. of pipe type spare.

Like the first protector body 1, the main structure of the second protector body 4 is not limited by the present invention, and those skilled in the art can refer to the prior art.

It can be understood that the outer side wall of the second protector body 4 is provided with a second external thread 41 for matching with the internal thread of the pipe-shaped part, when the second protector body 4 is installed, the second external thread 41 of the second protector body 4 is screwed with the internal thread of the pipe-shaped part, so that the internal thread of the pipe-shaped part can be prevented from being exposed, and the internal thread can be prevented from being damaged by collision; when the protector is disassembled, the second external thread 41 of the second protector body 4 is directly screwed out from the internal thread of the pipe-shaped piece.

The first end of the second protector body 4 refers to an end of the second protector body 4 closest to the outside corresponding to the internal thread of the pipe-shaped member after the pipe-shaped member is assembled with the second protector body.

In general, for easy guidance during installation, the radial dimension of the second external thread 41 is generally gradually increased from one end to the other end, that is, the two ends of the second protector body 4 are a large diameter end and a small diameter end, respectively, and in this case, the first end of the second protector body 4 is referred to as a large diameter end.

As shown in fig. 11 to 13, the third sealing element 5 includes a third embedding portion 51, a third covering portion 52 and a third connecting portion 53, the third embedding portion 51 is configured to be embedded in an outer side wall of the second protector body 4, as shown in fig. 10, an outer side wall of the first end of the second protector body 4 is provided with a third groove 42, and when the third sealing element 5 is installed, the third embedding portion 51 is embedded in the third groove 42 to realize a fixed connection between the third sealing element 5 and the second protector body 4.

As shown in fig. 10, the outer side wall of the first end of the second protector body 4 is provided with a step end surface 43 for being arranged opposite to the end surface of the pipe-shaped member, the third covering portion 52 is used for covering the step end surface 43, after the third sealing member 5 is installed on the second protector body 4, the third covering portion 52 is abutted against the step end surface 43, and the step end surface 43 has a stopping function on the third covering portion 52, so that the third covering portion 52 and the third embedding portion 51 are mutually restrained, thereby the third sealing member 5 and the second protector body 4 can be fixed more firmly, and the third sealing member 5 is prevented from easily falling off from the second protector body 4.

Meanwhile, the side surface of the third coating portion 52 is mainly used for being attached to or in pressing contact with the end surface of the pipe-shaped member to seal the internal thread of the pipe-shaped member.

The third connecting portion 53 is provided between the third embedded portion 51 and the third coated portion 52 to connect the third embedded portion 51 and the third coated portion 52 together.

From this it can be seen that, compare in prior art on the direct lateral wall of locating steel pipe shell with the rubber packing ring inlays, the utility model discloses a third cladding portion 52 has improved the fastness that third sealing member 5 and second protector body 4 are connected, makes third sealing member 5 be difficult for droing.

In order to improve the sealing performance of the third seal 5, in addition to the above embodiment, at least two second ring gears 521 for abutting contact with the end surface of the tubular member are provided on the side surface of the third coating portion 52.

That is, the present embodiment improves the sealing performance of the third seal 5 by providing the second ring gear 521 protruding from the surface of the third coating portion 52 on the sealing surface of the third seal 5, that is, the side surface of the third coating portion 52.

It can be understood that more than two second tooth rings 521 can form a mechanical labyrinth type sealing structure, so that the sealing stroke and the sealing area are increased, the sealing effect is better, and water vapor and the like are less prone to enter the gap of the internal thread of the pipe-shaped part from the first end of the second protector body 4.

It should be noted that, in this embodiment, the specific shape of the cross section of the second ring gear 521 is not limited, and the cross section of the second ring gear 521 may be rectangular, circular, or trapezoidal.

In order to improve the sealing effect on the internal thread of the pipe-shaped member to prevent moisture and the like from entering into the gap of the internal thread from the second end of the internal thread, a fourth sealing member 6 is usually disposed at the second end of the second protector body 4, as shown in fig. 9, the fourth sealing member 6 is located at the other side of the second external thread 41, and in consideration of the fixing reliability of the fourth sealing member 6 and the second protector body 4, as shown in fig. 14 to 16, on the basis of the above embodiments, the fourth sealing member 6 includes a fourth embedding portion 61, a fourth cladding portion 62, and a fourth connecting portion 63 for connecting the fourth embedding portion 61 and the fourth cladding portion 62.

As shown in fig. 10, a fourth groove 44 is formed in an outer side wall of the second end of the second protector body 4, and when the fourth sealing element 6 is mounted, the fourth embedding portion 61 is embedded in the fourth groove 44, so that the fourth sealing element 6 is fixedly connected with the second protector body 4.

The fourth cladding part 62 is used for cladding the end face of the second end of the second protector body 4, after the fourth sealing element 6 is installed on the second protector body 4, the fourth cladding part 62 abuts against the end face of the second end of the second protector body 4 in an attaching manner, the end face of the second end of the second protector body 4 plays a role in stopping the fourth cladding part 62, the fourth cladding part 62 and the fourth embedding part 61 are made to be mutually restrained, so that the fourth sealing element 6 and the second protector body 4 can be fixed more firmly, and the fourth sealing element 6 is prevented from easily falling off from the second protector body 4.

The fourth connecting portion 63 is provided between the fourth embedded part 61 and the fourth clad part 62 to connect the fourth embedded part 61 and the fourth clad part 62 together. Meanwhile, the fourth connecting portion 63 is also mainly used for being attached to or in pressing contact with the inner side wall of the pipe-shaped member so as to seal the internal thread of the pipe-shaped member.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The external thread protector provided by the utility model is described in detail above. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims

1. An external thread protector, comprising:

the first protector body (1) is used for protecting the external threads of the pipe-shaped piece from being collided by the outside, and the inner side wall of the first end of the first protector body (1) is provided with a first groove (12);

a first seal (2) for sealing the external thread, the first seal (2) comprising:

a first embedding part (21) embedded in the first groove (12);

a first covering part (22) covering the end face of the first end;

a first connection portion (23) connecting the first embedding portion (21) and the first cladding portion (22), the first connection portion (23) being used for being in fit contact with the outer side wall of the pipe fitting to seal the external thread.

2. The male thread protector according to claim 1, characterized in that the first embedding portion (21) is arranged obliquely towards the first cladding portion (22).

3. External thread protector according to claim 1, characterized in that the first connection (23) is provided with at least two first rings (231) towards the side of the external side wall of the pipe profile.

4. The male thread protector according to any one of claims 1 to 3, characterized in that the first seal (2) further comprises an eversion (24) connected to the first cladding (22) for cladding the outer sidewall of the first end.

5. The male thread protector according to claim 4, characterized in that the outer side wall of the first end is provided with a counter sink (13) for receiving the evagination (24), the side wall of the counter sink (13) abutting against the end surface of the evagination (24).

6. The male thread protector according to claim 4, characterized in that the second end of the first protector body (1) is provided with a second groove (14), the groove bottom width of the second groove (14) being larger than the notch width of the second groove (14), the second groove (14) being embedded with a second seal (3) having elasticity.

7. The male thread protector of claim 6, characterized in that the second seal (3) comprises:

a second insertion portion (31) inserted into the second groove (14);

and the second sealing part (32) is connected with the second embedding part (31) and is used for being in contact with the end surface of the pipe-shaped piece in a fitting mode, and the second sealing part (32) is a truncated conical surface.

8. An internal thread protector, comprising:

a second protector body (4) for protecting the internal thread of the pipe-shaped piece from being collided by the outside, the outer side wall of the first end of the second protector body (4) is provided with a third groove (42) and a step end face (43) for being arranged opposite to the end face of the pipe-shaped piece;

a third seal (5) for sealing the internal thread, the third seal (5) comprising:

a third insertion portion (51) inserted into the third groove (42);

a third coating part (52) coated on the step end face (43), wherein the side face of the third coating part (52) is used for being in fit contact with the end face of the pipe-shaped piece so as to seal the internal thread;

a third connecting portion (53) connecting the third embedded portion (51) and the third coating portion (52).

9. The female thread protector according to claim 8, characterized in that the third cladding (52) is flanked by at least two second toothed rings (521) for abutting contact with the end face of the tubular piece.

10. The female thread protector according to claim 8 or 9, characterized in that the outer side wall of the second end of the second protector body (4) is provided with a fourth groove (44); further comprising a fourth seal (6) for sealing the internal thread, the fourth seal (6) comprising:

a fourth insertion portion (61) inserted into the fourth groove (44);

a fourth coating part (62) coated on the end surface of the second end;

a fourth connecting portion (63) connecting the fourth embedded portion (61) and the fourth cladding portion (62), the fourth connecting portion (63) being adapted to be in abutting contact with an inner side wall of a tubular member to seal the internal thread.