CN210290435U

CN210290435U - High-connection-tightness threaded fastener

Info

Publication number: CN210290435U
Application number: CN201920959323.1U
Authority: CN
Inventors: 尹继勇
Original assignee: Suzhou Jinding Fastener Co ltd
Current assignee: Suzhou Jinding Fastener Co ltd
Priority date: 2019-06-24
Filing date: 2019-06-24
Publication date: 2020-04-10
Anticipated expiration: 2029-06-24

Abstract

The utility model discloses a high connection sealing threaded fastener, which relates to a threaded fastener and has the technical scheme that the threaded fastener comprises a screw rod and a screw head which are coaxially arranged, wherein the outer circumferential side wall of the screw rod is provided with an annular groove close to the screw head, and an elastic sealing ring is sleeved at the annular groove; an accommodating cavity is axially arranged in the screw rod, and one end of the accommodating cavity extends to the end part of the screw head to form an opening; the annular department is provided with a plurality of and holds the through-hole of chamber intercommunication, be provided with a plurality of through-holes on the interior circumference lateral wall of elastic seal circle and stretch into the bulge that holds the intracavity, it is provided with the drive arrangement who is used for driving about the bulge to remove to the screw rod axis direction of keeping away from to hold the intracavity. The utility model discloses it has the advantage of connecting firmly, gas tightness is good.

Description

High-connection-tightness threaded fastener

Technical Field

The utility model relates to a threaded fastener, more specifically say that it relates to a high leakproofness threaded fastener of connecting.

Background

During the assembly process of the high-voltage electrical equipment, the electrical components need to be fixed in the air box. Thus, the fixing screws for fixing these electrical devices need to have not only high pressure-bearing capacity but also air-tight performance to ensure that the gas in the box does not leak from the screw connection position, but most of the existing screws only play a role of fixed connection and do not have high air-tight performance.

For solving above-mentioned problem prior application publication No. CN108468699A a sealing screw subassembly and connecting screw thereof, wherein the sealing screw subassembly includes connecting screw, and connecting screw includes screwhead and threaded connection section, and the screwhead is the notch cuttype that contains major diameter section and minor diameter section, and the minor diameter section is located the position between major diameter section and the threaded connection section, installs the sealing washer on the minor diameter section.

Although the sealing screw plays a role in increasing the connection sealing performance by arranging the sealing ring, the annular sealing ring is easily changed into an oval shape in the assembling process due to extrusion, so that a gap is formed between the sealing ring and the threaded connection section, and air leakage is caused. Thus, there is a need for further improvements in designing a threaded fastener with improved sealing properties.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims to provide a high leakproofness threaded fastener connects, it has the advantage of connecting firmly, the leakproofness is splendid.

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

a threaded fastener with high connection sealing performance comprises a screw rod and a screw head which are coaxially arranged, wherein an annular groove close to the screw head is formed in the side wall of the outer circumference of the screw rod, and an elastic sealing ring is sleeved at the annular groove; an accommodating cavity is axially arranged in the screw rod, and one end of the accommodating cavity extends to the end part of the screw head to form an opening; the annular department is provided with a plurality of and holds the through-hole of chamber intercommunication, be provided with a plurality of through-holes on the interior circumference lateral wall of elastic seal circle and stretch into the bulge that holds the intracavity, it is provided with the drive arrangement who is used for driving about the bulge to remove to the screw rod axis direction of keeping away from to hold the intracavity.

By adopting the technical scheme, when the screw is fastened and connected, the screw rod of the threaded fastener is screwed into the screw hole according to the conventional mounting method of the screw or the bolt until the elastic sealing ring preliminarily blocks the opening of the screw hole. Then, with the help of a driving device, the protruding part is driven to move in the through hole in the direction away from the axis of the screw rod, so that the elastic sealing ring expands outwards and is tightly attached to the surrounding hole wall, and the effect of high connection sealing performance is achieved. Compare in the fastener that adopts ring type seal circle purely, the utility model discloses a threaded fastener adaptability is better, even if slight deviation appears in the screw size, still can satisfy high leakproofness connection requirement. Meanwhile, the elastic sealing ring after outward expansion also enables the threaded fastener to be difficult to loosen.

Further, the through-hole is the bar hole that sets up along the screw rod axial, the bulge is the bead that sets up along the elastic sealing ring axial.

By adopting the technical scheme, on one hand, the convex edge can enable the elastic sealing ring to expand outwards under the driving of the driving device, and the requirement of increasing the air tightness is met; on the other hand, the arrangement of the convex ribs also enables the elastic sealing ring to be difficult to loosen and dislocated in a circumferential rotating mode, and the connection stability is improved.

Furthermore, the convex edges and the strip-shaped holes are distributed at equal intervals along the circumferential direction of the screw rod.

Through adopting above-mentioned technical scheme for elastic seal ring can evenly expand outward, has promoted connection stability and gas tightness.

Further, the length of the convex rib is shorter than that of the strip-shaped hole.

Through adopting above-mentioned technical scheme, provide the space for the removal of bead in the bar hole for the removal of bead is nimble, is difficult for appearing the card and dies to cause the unable outward expansion of elastic seal circle to the sealed condition that targets in place.

Furthermore, a circular sinking groove communicated with the accommodating cavity is formed in the end face, away from the screw rod, of the screw head; the driving device comprises a movable rod arranged in the accommodating cavity along the axial direction of the screw rod, a rotating block coaxially arranged at the tail end of the movable rod and a pushing block coaxially arranged at one end of the movable rod, which is far away from the rotating block; the rotating block is arranged in the sinking groove, and the circumferential side wall of the rotating block is in threaded connection with the circumferential side wall of the sinking groove; the pushing block is in a round table shape and is positioned on one side, far away from the screw head, of the part, extending into the accommodating cavity, of the protruding part, and the diameter of one end, far away from the movable rod, of the pushing block is larger than that of the end, connected with the movable rod, of the pushing block; the end face of the rotating block, which deviates from the movable rod, is provided with an operating part for driving the rotating block to rotate.

By adopting the technical scheme, after the elastic sealing ring is connected in place, the rotating block is rotated by the operation part, so that the movable rod moves along the length direction of the movable rod, the pushing block is driven to move and push the protruding part, and the elastic sealing ring is expanded to completely block the screw hole. The rotating block is in threaded connection with the side wall of the sinking groove, and can be self-locked after rotating in place, so that the sinking groove is not easy to loosen.

Further, the operating part is a cross-shaped or straight-shaped groove.

Through adopting above-mentioned technical scheme, with the help of screwdriver and recess cooperation, alright conveniently rotate the rotation piece to make elastic sealing ring with the screw shutoff or loosen.

Further, the diapire that sinks the groove is equipped with the mounting groove, set up elasticity direction and movable rod axial unanimity in the mounting groove and have the elastic component that orders about the rotatory piece and break away from heavy groove trend.

Through adopting above-mentioned technical scheme, with the back that puts threaded fastener in place, because the existence of elastic component makes rotatory piece receive all the time along the axial effort of movable rod, the difficult not hard up of rotatory piece under the exogenic action to make and keep high sealing state all the time between elastic seal circle and the screw hole.

Furthermore, the elastic element is a conical compression spring coaxially sleeved on the movable rod.

By adopting the technical scheme, the rotating block moves towards the direction close to the screw rod, and the conical compression spring is completely compressed and is collected into the mounting groove, so that the occupied space is reduced; when the rotating block moves reversely, the conical compression spring restores part of the deformation, but still has certain elasticity, so that the rotating block is not easy to rotate by itself.

Further, be provided with a plurality of and hold the air flue of chamber intercommunication in the screw rod, the air flue is kept away from and is held chamber one end and extend to the screw rod outer wall and form the opening.

Through adopting above-mentioned technical scheme, when selecting the screw pole into the screw, screw internal gap department air is in compression state, and when rotating rotatory piece, the movable rod removes and makes and hold the intracavity negative pressure state appear. Will hold chamber and external intercommunication through the air flue, can balanced pressure be convenient for rotate rotatory piece on the one hand, on the other hand has also released the compressed air of screw rod and screw hole pore wall clearance department, and it is firm to do benefit to the connection of screw fastener.

Further, the end face of the screw head facing the screw rod is coaxially provided with a gasket.

Through adopting above-mentioned technical scheme, increased the area of contact between screwhead terminal surface and the installation spare part, reduced and separated the damage, also make threaded fastener difficult not hard up.

To sum up, the utility model discloses following beneficial effect has:

will the utility model discloses a threaded fastener installs the back according to conventional screw or bolt installation method, can order about the bulge with the help of drive arrangement and remove to keeping away from screw rod axis direction in the through-hole for the elasticity sealing washer expands outward, and closely laminates with pore wall on every side, plays the high leakproofness effect of connecting. Compare in the fastener that adopts ring type seal circle purely, the utility model discloses a threaded fastener adaptability is better, even if slight deviation appears in the screw size, still can satisfy high leakproofness connection requirement. Meanwhile, the elastic sealing ring after outward expansion also enables the threaded fastener to be difficult to loosen, and connection firmness is improved.

Drawings

FIG. 1 is a schematic structural view of a high connection tightness threaded fastener in an embodiment;

FIG. 2 is a schematic end view of the screw head of the embodiment;

FIG. 3 is an exploded view of an embodiment high connection tightness threaded fastener;

FIG. 4 is a cross-sectional view of an embodiment high connection tightness threaded fastener;

fig. 5 is an enlarged view of a portion a in fig. 4.

In the figure: 1. a screw shaft; 11. a ring groove; 111. a strip-shaped hole; 12. an accommodating chamber; 13. an airway; 2. a screw head; 21. sinking a groove; 22. mounting grooves; 23. a conical compression spring; 3. an elastic sealing ring; 31. a rib; 4. a gasket; 5. a movable rod; 6. rotating the block; 61. a groove; 7. and a pushing block.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Example (b):

a high connection tightness threaded fastener, referring to fig. 1, comprises a screw rod 1, a screw head 2 and a washer 4 which are coaxially arranged. One end of the screw rod 1 is conical, the other end of the screw rod is connected with the screw head 2, and the side wall of the outer circumference of the screw rod 1 is provided with threads. The screw head 2 is arranged at the end of the screw rod 1, and the washer 4 is larger in diameter than the screw head 2 and is fixedly arranged at the end face of the screw head 2 facing the screw rod 1. The washer 4 increases the contact surface between the threaded fastener and the part, and increases the connection stability.

Referring to fig. 2, the screw head 2 is shaped like a regular hexagon in cross section, and the screw head 2 can be easily rotated by an alien wrench to insert the screw shaft 1 into the screw hole.

Referring to fig. 3 and 4, in order to increase the connection tightness after the installation of the threaded fastener, the screw rod 1 is coaxially provided with an elastic sealing ring 3. The screw rod 1 is provided with a ring groove 11 on the outer circumferential side wall of one end close to the screw head 2, and the depth of the ring groove 11 is equal to the thickness of the elastic sealing ring 3. The elastic sealing ring 3 is sleeved on the annular groove 11.

Referring to fig. 3 and 4, an accommodating cavity 12 is axially arranged in the screw rod 1, one end of the accommodating cavity 12 extends towards the screw head 2, and an opening is formed at the end surface of the screw head 2. The annular groove 11 is provided with a plurality of through holes communicated with the containing cavity 12, and the inner circumferential side wall of the elastic sealing ring is provided with a plurality of convex parts respectively inserted into the through holes at corresponding positions. In this embodiment, the through hole is a strip-shaped hole 111 disposed along the axial direction of the screw shaft 1. The strip-shaped holes 111 are arranged at three positions in total and are distributed at equal intervals along the circumferential direction of the screw rod 1. The protrusion is a rib 31 provided on the inner circumferential sidewall of the elastic sealing ring 3 along the axial direction of the elastic sealing ring 3. The number of the convex ribs 31 is three, and the convex ribs correspond to the positions of the strip-shaped holes 111 one by one.

Referring to fig. 4 and 5, the rib 31 is inserted into the strip-shaped hole 111 and partially extends into the accommodating chamber 12. The receiving cavity 12 is provided with a driving means for driving the rib 31 to move away from the axis of the screw shaft 1. The driving device comprises a pushing block 7 arranged in the accommodating cavity 12, a movable rod 5 and a rotating block 6 connected to the tail end of the movable rod 5. The pushing block 7 is in a round table shape, and the diameter of one end far away from the screw head 2 is larger than that of the other end. The movable rod 5 is a cylindrical rod and is coaxially arranged at one end of the pushing block 7 with a smaller diameter. The rotating block 6 is in a disc shape and is coaxially arranged at one end of the movable rod 5 far away from the pushing block 7. The end surface of the screw head 2 far away from the screw rod 1 is provided with a sunk groove 21, the rotating block 6 is positioned in the sunk groove 21, and the outer circumferential side wall of the rotating block 6 is in threaded connection with the circumferential side wall of the sunk groove 21. The rotating block 6 is rotated to enable the movable rod 5 to move along the axial direction of the accommodating cavity 12, so that the pushing block 7 pushes the convex edge 31, and the elastic sealing ring 3 expands outwards, thereby increasing the connection sealing performance of the threaded fastener.

Referring to fig. 2 and 5, a cross-shaped groove 61 is formed in the end surface of the rotating block 6 away from the movable rod 5, and the rotating block 6 can be easily rotated by a screwdriver, so that the elastic sealing ring 3 is expanded. Meanwhile, in order to make the elastic sealing ring 3 stably in an outward expansion state, the bottom wall of the sinking groove 21 is provided with a mounting groove 22. A set of conical compression springs 23 which are arranged in the movable rod 5 and are always in a compressed state are arranged in the mounting groove 22. The conical compression spring 23 has a tendency of driving the rotating block 6 to separate from the sinking groove 21, so that the rotating block 6 is not easy to loosen without external force, and the elastic sealing ring 3 can be kept in connection with the screw hole for a long time.

Referring to fig. 5, in order to increase the flexibility of movement of the rib 31 in the strip-shaped hole 111, the length of the rib 31 is shorter than the length of the strip-shaped hole 111.

Referring to fig. 4 and 5, in order to make the operation of rotating the rotating block 6 easy and reduce the increase of air pressure at the gap in the screw hole caused by the insertion of the screw rod 1, a plurality of air passages 13 communicated with the accommodating cavity 12 are arranged inside the screw rod 1, and one ends of the air passages 13 far away from the accommodating cavity 12 are all formed with openings on the circumferential side wall of the screw rod 1. The air channel 13 can maintain the pressure in the accommodating cavity 12 balanced when the rotating block 6 is rotated or the screw head 2 is rotated to insert the screw shaft 1 into the screw hole.

The working principle is as follows:

after the threaded fastener of the embodiment is installed according to a conventional screw or bolt installation method, the rotating block 6 can be rotated by a screwdriver, so that the movable rod 5 drives the pushing block 7 to push the convex edge 31 to move in the strip-shaped hole 111 towards the direction away from the axis of the screw rod 1, the elastic sealing ring 3 expands outwards and is tightly attached to the surrounding screw hole wall, and the high connection sealing effect is achieved. Compare in the fastener that adopts ring type seal circle purely, the utility model discloses a threaded fastener adaptability is better, even if slight deviation appears in the screw size, can satisfy high leakproofness connection requirement anyhow. Meanwhile, the elastic sealing ring 3 after outward expansion also enables the threaded fastener to be difficult to loosen.

The above-mentioned embodiments are merely illustrative of the present invention, and are not intended to limit the present invention, and those skilled in the art can make modifications to the embodiments without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent laws and protection within the scope of the present invention.

Claims

1. A high connection sealing threaded fastener comprises a coaxially arranged screw rod (1) and a screw head (2), and is characterized in that: an annular groove (11) close to the screw head (2) is formed in the side wall of the outer circumference of the screw rod (1), and an elastic sealing ring (3) is sleeved at the annular groove (11); an accommodating cavity (12) is axially arranged in the screw rod (1), and one end of the accommodating cavity (12) extends to the end part of the screw head (2) to form an opening; annular (11) department is provided with a plurality of and holds the through-hole of chamber (12) intercommunication, be provided with a plurality of through-holes of running through on the interior circumference lateral wall of elastic seal circle (3) and stretch into the bulge that holds in chamber (12), it is used for driving about the bulge to move away from screw rod (1) axis direction drive arrangement to hold to be provided with in chamber (12).

2. The threaded fastener with high connection tightness according to claim 1, wherein: the through-hole is bar hole (111) along screw rod (1) axial setting, the bulge is along bead (31) of elastic seal circle (3) axial setting.

3. A high connection tightness threaded fastener according to claim 2, characterized in that: the convex ribs (31) and the strip-shaped holes (111) are distributed at equal intervals along the circumferential direction of the screw rod (1).

4. A high connection tightness threaded fastener according to claim 3, characterized in that: the length of the convex rib (31) is shorter than that of the strip-shaped hole (111).

5. A high connection tightness threaded fastener according to any one of claims 1 to 4, characterized in that: a circular sinking groove (21) communicated with the accommodating cavity (12) is formed in the end face, away from the screw rod (1), of the screw head (2); the driving device comprises a movable rod (5) axially arranged in the accommodating cavity (12) along the screw rod (1), a rotating block (6) coaxially arranged at the tail end of the movable rod (5) and a pushing block (7) coaxially arranged at one end, far away from the rotating block (6), of the movable rod (5); the rotating block (6) is arranged in the sinking groove (21), and the circumferential side wall of the rotating block (6) is in threaded connection with the circumferential side wall of the sinking groove (21); the pushing block (7) is in a round table shape and is positioned on one side, far away from the screw head (2), of the part, extending into the accommodating cavity (12), of the protruding part, and the diameter of one end, far away from the movable rod (5), of the pushing block (7) is larger than that of the end, connected with the movable rod (5); the end face, deviating from the movable rod (5), of the rotating block (6) is provided with an operation part for driving the rotating block (6) to rotate.

6. The threaded fastener with high connection tightness according to claim 5, wherein: the operating part is a cross-shaped or straight-shaped groove (61).

7. The threaded fastener with high connection tightness according to claim 5, wherein: the diapire of heavy groove (21) is equipped with mounting groove (22), set up elasticity direction and movable rod (5) axial unanimity in mounting groove (22) and have the elastic component of driving rotatory piece (6) and breaking away from heavy groove (21) trend.

8. The threaded fastener with high connection tightness according to claim 7, wherein: the elastic piece is a conical compression spring (23) coaxially sleeved on the movable rod (5).

9. The threaded fastener with high connection tightness according to claim 1, wherein: be provided with in screw rod (1) a plurality of and hold air flue (13) of chamber (12) intercommunication, air flue (13) are kept away from and are held chamber (12) one end and extend to screw rod (1) outer wall and form the opening.

10. The threaded fastener with high connection tightness according to claim 1, wherein: the end face of the screw head (2) facing the screw rod (1) is coaxially provided with a gasket (4).