TWI797668B - joint structure - Google Patents

Abstract

A joint structure includes a screw sleeve and a pipe core. The screw sleeve has a through hole, one end of which is provided with a connecting portion for connecting with an interface of an external device, and the other end protrudes an inner flange toward the center of the through hole. The tube core includes a head and a tail protruding from the head to one side. The head can be movably accommodated in the through hole of the screw sleeve and is stopped by the inner flange. The tail protrudes out of the through hole and is used for connecting An external fitting. When the screw sleeve is fastened with the connecting portion and the interface, the head of the tube core is not fixed on the interface, and the tube core can still move relative to the screw sleeve.

Description

joint structure

The present invention relates to pipe fitting connectors, especially a joint that allows pipe fittings to rotate freely after being connected to equipment.

As shown in FIG. 11 , the conventional joint structure includes a short core 91 for connecting a pipe 93 , a screw sleeve 92 and a leak-proof washer 95 accommodated in the screw sleeve 92 . One end of the screw sleeve 92 is provided with a thread segment 921 which can be connected with equipment, and the other end is provided with a flange 922 protruding inwardly, and the short core 91 is set in the screw sleeve 92 and abuts against the screw sleeve 92. The flange 922 is positioned.

When the above-mentioned conventional joint is actually used, the pipe fitting 93 is first combined with the short core 91. Due to factors such as the material of the pipe fitting and the barbs on the outer periphery of the short core 91, the pipe fitting 93 will be very tightly combined with the short core 91. It can be regarded as a fixed state. Next, the threaded sleeve 92 is screwed onto the interface 94 of the equipment with the threaded segment 921. As the threaded sleeve 92 continues to be screwed into the interface 94, the flange 922 will push the short core 91 to move towards the interface 94, and push against the leakage. The washer 95 is until it touches the interface 94, and then the screw sleeve 92 is tightened at this time, so that the anti-leakage washer 95 is tightly pressed against the interface 94, and the connection between the pipe fitting 93 and the equipment can be completed.

During the working process, the pipe fitting 93 is often twisted and twisted. Since the pipe fitting 93 is fastened to the short core 91, the torsional force will be transmitted to the short core 91. However, the short core 91 and the anti-leakage washer 95 are pressed tightly against the interface 94 by the screw sleeve 92, so a great friction force is generated and they cannot rotate; When the short core 91 forms a fastened state, the torsional force will also be transmitted to the screw sleeve 92, and then the screw sleeve 92 will rotate relative to the interface 94, causing the pipe fitting 93 to loosen and cause leakage.

The main purpose of the present invention is to provide a joint structure, which can still allow the pipe to rotate freely after being connected to the equipment, and has the effect of preventing the joint from falling off due to the twist of the pipe during work.

To achieve the aforementioned purpose, the present invention provides a joint structure, which includes: A threaded sleeve with a through hole, one end of which is provided with a connecting portion for connecting with an interface of an external device, and the other end protrudes an inner flange toward the center of the through hole; A tube core, which includes a head and a tail protruding from the head to one side, the head is movably accommodated in the through hole of the screw sleeve and is stopped by the inner flange, the tail extends out of the through hole and used to connect an external pipe; when the threaded sleeve is fastened to the interface with the connection part, the head of the die is not fixed on the interface, and the pipe core can still move relative to the threaded sleeve .

Preferably, the head has a die end face, the interface has an interface end face, and when the threaded sleeve is fastened to the interface by the connecting portion, there is a gap between the die end face and the interface end face.

Preferably, at least one first anti-leakage ring is provided between the head and the wall of the through hole.

Preferably, at least one second anti-leakage ring is provided between the screw sleeve and the interface.

In one embodiment, the connecting portion of the threaded sleeve is an internal thread section for screwing with an external thread section of the interface.

In another embodiment, the connecting portion of the threaded sleeve is an external threaded section to be screwed with an internal threaded section of the interface.

Preferably, the head of the tube core is provided with a thimble for controlling a valve element provided at the interface.

Preferably, the tail of the die protrudes from the through hole and can be used to connect to an external pipe or an external pipe with a joint.

Preferably, the wall surface of the through hole has a stepped surface formed due to the difference in inner diameter, and a leak-proof gasket is provided in the through-hole, and the leak-proof gasket has a bottom whose outer diameter expands radially, and The bottom is positioned against the stepped surface.

The above objects and advantages of the present invention can be easily understood from the following detailed descriptions and accompanying drawings of selected embodiments.

Please refer to Figures 1 and 2, which show the first embodiment of the joint structure provided by the present invention, which is used to connect with an interface 3 of an external device. The joint structure includes a screw sleeve 1 and a tube core 2 . The screw sleeve 1 has a through hole 11 , one end of the screw sleeve 1 is provided with a connecting portion for connecting with the interface 3 , and the other end protrudes an inner flange 13 toward the center of the through hole 11 . In this embodiment, the connecting portion is an external thread section 12 , and the interface 3 has a corresponding screw-connected internal thread section 31 for connecting the screw sleeve 1 and the interface 3 together.

In addition, the tube core 2 is a tubular structure with a channel in the middle, which can pass through the through hole 11 of the screw sleeve 1 . The die 2 includes a head 21 and a tail 22 protruding from the head 21 to one side. The outer diameter of the head 21 is smaller than the inner diameter of the through hole 11 and is movably accommodated in the through hole 11. However, the outer diameter of the head 21 is greater than the inner diameter of the hole surrounded by the inner flange 13, so the head 21 will be blocked by the inner flange 13. The outer diameter of the tail portion 22 is smaller than the inner diameter of the hole surrounded by the inner flange 13, so the tail portion 22 can pass through the inner flange 13 and protrude out of the screw sleeve 1, and can be shown in Figure 2. Connect an external pipe 41, or connect an external pipe 42 with a joint 421 as shown in FIG. 3 .

The aforementioned tube core 2 is not positioned in the screw sleeve 1 , but can still rotate freely in the through hole 11 . The peripheral surface of the head 21 is provided with at least one groove 23 for accommodating at least one first anti-leakage ring 24, and the first anti-leakage ring 24 is pressed against the peripheral wall of the through hole 11 to produce an anti-leakage Effect. The quantity of the first anti-leakage ring 24 depends on the working pressure of the fluid in the pipeline; A stop ring 24 .

Another anti-leakage implementation is as shown in FIG. 4, a groove 23' for accommodating the first anti-leakage ring 24 is provided on the peripheral wall of the through hole 11, and the peripheral surface of the head 21 of the die 2 Then it is relatively flat, and the gap between the head 21 and the through hole 11 can also be sealed by the first leak-proof ring 24 to achieve leak-stopping.

As shown in Figure 1 and Figure 2, when the screw sleeve 1 is firmly engaged with the internal thread section 31 of the interface 3 by the external thread section 12, the head 21 of the tube core 2 is not fixed on the interface 3 On the other hand, the tube core 2 can still rotate relative to the screw sleeve 1 in the through hole 11 . In detail, the head 21 has a die end surface 25. When the die 2 is accommodated in the through hole 11, the head 21 is completely received in the through hole 11 so that the die end face 25 is away from the through hole 11. There is a certain distance between the top surface of screw sleeve 1. Therefore, when the screw sleeve 1 is tightly engaged with the interface 3, the end surface 25 of the tube core is of course separated from the interface end surface 32 of the interface 3 by a gap 26, and they are not in contact with each other, and the tube core 2 Without any external constraints, the degree of freedom of rotation in the through hole 11 can still be maintained. Accordingly, even if the external pipe 41 twists and twists during operation, and then transmits it to the die 2, based on the degree of freedom of rotation of the die 2 in the through hole 11, the external pipe 41 The resulting torsional force will only cause the tube core 2 to rotate idly in the through hole 11 without affecting the connection between the threaded sleeve 1 and the interface 3 , thus producing the effect of preventing loosening.

In order to further enhance the anti-leakage effect, in this embodiment, a second anti-leakage ring 14 is provided between the screw sleeve 1 and the interface 3, so as to prevent the fluid from passing through the gap between the screw sleeve 1 and the interface 3. Crevice leaks.

Figure 5 shows the third embodiment of the present invention. The structure of this embodiment is based on the structure of the aforementioned first embodiment, and a thimble 27 is provided on the head 21 of the die 2 to control the valve 33 provided on the interface 3 . When the threaded sleeve 1 is tightly engaged with the interface 3, although the thimble 27 is in contact with the valve member 33 to control the opening of the valve member 33, because the tube core end surface 25 of the tube core 2 is not connected to the interface end surface 32. and the contact area between the thimble 27 and the valve member 33 is very small, so the degree of freedom of rotation of the tube core 2 in the through hole 11 is not hindered. Accordingly, even if the external tube 41 is twisted and twisted during operation, and then transmitted to the die 2, the torsional force caused by the external tube 41 will only cause the die 2 to rotate idly in the through hole 11 , without affecting the engagement between the threaded sleeve 1 and the interface 3, thereby producing the effect of preventing loosening.

Figures 6 and 7 show the fourth embodiment of the present invention. The structure of this embodiment includes a screw sleeve 5 and a tube core 6 . The screw sleeve 5 has a through hole 51 , one end of the screw sleeve 5 is provided with a connecting portion for connecting with the interface 7 , and the other end protrudes an inner flange 53 toward the center of the through hole 51 . In this embodiment, the connecting portion is an internal thread section 52 , and the interface 7 has a corresponding screw-connected external thread section 71 for connecting the screw sleeve 5 and the interface 7 together.

In addition, the tube core 6 is a tubular structure with a channel in the middle, which can pass through the through hole 51 of the screw sleeve 5 . The die 6 includes a head 61 and a tail 62 protruding from the head 61 to one side. The outer diameter of the head 61 is smaller than the inner diameter of the through hole 51 and is movably accommodated in the through hole 51. However, the outer diameter of the head 61 is greater than the inner diameter of the hole surrounded by the inner flange 53, so the head 61 will be blocked by the inner flange 53. The outer diameter of the tail portion 62 is smaller than the inner diameter of the hole surrounded by the inner flange 53, so the tail portion 62 can pass through the inner flange 53 and protrude out of the screw sleeve 5, and can be as shown in Figure 7. Connect an external pipe 81, or connect an external pipe 82 with a joint 821 as shown in FIG. 8.

The tube core 6 is not positioned in the screw sleeve 5 and can still rotate freely in the through hole 51 . The peripheral surface of the head 61 is provided with at least one groove 63 for accommodating at least one first anti-leakage ring 64 , and the first anti-leakage ring 64 is pressed against the peripheral wall of the through hole 51 to produce an anti-leakage Effect. The quantity of the first anti-leakage ring 64 depends on the working pressure of the fluid in the pipeline; A stop ring 64 .

Another embodiment of anti-leakage is that a groove for the first anti-leakage ring is provided on the peripheral wall of the through hole, and the peripheral surface of the head of the die is relatively flat. The gap between the head and the through hole is sealed to prevent leakage.

As shown in Figure 6 and Figure 7, when the threaded sleeve 5 is tightly engaged with the external thread segment 71 of the interface 7 by the internal thread section 52, the head 61 of the tube core 6 is not fixed on the interface 7 On the other hand, the tube core 6 can still rotate relative to the screw sleeve 5 in the through hole 51 . In detail, the head 61 has a die end face 65, and the interface 7 has an interface end face 72. When the screw sleeve 5 is tightly engaged with the interface 7, the die end face 65 is connected to the interface end face 72 to A gap 66 is separated and not abutted against each other, so the tube core 6 is not subject to any external restraint, and can still retain the degree of freedom of rotation in the through hole 51 . Accordingly, even if the external tube 81 twists and twists during operation, and then transmits it to the die 6 , based on the degree of freedom of rotation of the die 6 in the through hole 51 , the external tube 81 The resulting torsional force will only make the tube core 6 idle in the through hole 51 without affecting the connection between the threaded sleeve 5 and the interface 7, thereby preventing loosening.

In order to further enhance the anti-leakage effect, in this embodiment, a second anti-leakage ring 54 is provided between the screw sleeve 5 and the interface 7, so as to prevent the fluid from passing through the gap between the screw sleeve 5 and the interface 7. Crevice leaks.

Figure 9 shows the fifth embodiment of the present invention. The structure of this embodiment is based on the structure of the aforementioned third embodiment, and a leak-proof washer 55 is provided in the through hole 51 of the screw sleeve 5 . The hole wall of the above-mentioned through hole 51 has a stepped surface 511 formed due to the difference in inner diameter. The anti-leakage gasket 55 is disposed in the through hole 51 , and has a bottom 551 whose outer diameter expands radially, and is positioned by the bottom 551 abutting against the stepped surface 511 . When the screw sleeve 5 is tightened on the interface 7, the anti-leakage gasket 55 is pushed by the screw sleeve 5 and pressed against the interface 7, thereby achieving a sealing effect.

In this embodiment, the anti-leak gasket 55 is located between the die 6 and the interface 7, thereby separating the die 6 and the interface 7 so that the two are not in a relatively fixed state, so that the die 6 still retains the degree of freedom of rotation in the through hole 51, so that the outer tube 81 can be twisted and twisted to make the tube core 6 idle in the through hole 51 without affecting the connection between the screw sleeve 5 and the interface 7. The joint, thereby producing the effect of preventing loosening.

In this embodiment, when the screw sleeve 5 is tightened on the interface 7, even if the head 61 of the tube core 6 contacts the leak-proof gasket 55 due to shape or size factors, based on the screw sleeve 5 Because the stepped surface 511 pushes the anti-leakage gasket 55 upwards so that it is tightly pressed against the interface 7, the head 61 of the tube core 6 is not subjected to the resisting force from the inner flange 53, so the tube The core 6 still retains the degree of freedom of rotation in the through hole 51 and will not be restricted from rotating due to contact with the anti-leakage washer 55 .

Figure 10 shows the sixth embodiment of the present invention. The structure of this embodiment is based on the structure of the aforementioned third embodiment, and a thimble 67 is provided on the head 61 of the tube core 6 to control the valve 73 provided on the interface 7 . When the screw sleeve 5 is firmly engaged with the interface 7, although the thimble 67 is in contact with the valve member 73 to control the opening of the valve member 73, because the tube core end surface 65 of the tube core 6 is not connected to the interface end surface 72 and the contact area between the thimble 67 and the valve member 73 is very small, so the degree of freedom of rotation of the tube core 6 in the through hole 51 is not hindered. Accordingly, even if the external tube 81 is twisted and twisted during operation, and then transmitted to the die 6 , the torsional force caused by the external tube 81 will only cause the die 6 to rotate idly in the through hole 51 , without affecting the engagement between the threaded sleeve 5 and the interface 7, thereby producing the effect of preventing loosening.

However, the disclosure of the above embodiments is only used to illustrate the present invention, not to limit the present invention, and any replacement of equivalent elements should still fall within the scope of the present invention.

To sum up, those skilled in the art can understand that the present invention can clearly achieve the above-mentioned purpose, and it actually complies with the provisions of the Patent Law, so they should file an application according to the law.

Screw sleeve 1 Through hole 11 External thread section 12 Inner flange 13 The second anti-leakage ring 14 Die 2 Head 21 Tail 22 Groove 23, 23' The first stop ring 24 Die end face 25 Clearance 26 Thimble 27 Interface 3 Internal thread section 31 Interface end face 32 Valve 33 External fitting 41 External fittings 42 Connector 421 Screw sleeve 5 Through hole 51 Step surface 511 Internal thread section 52 Inner flange 53 Second leak stop ring 54 Leakage washer 55 Bottom 551 Die 6 Header 61 Tail 62 Groove 63 The first leak stop ring 64 Die end face 65 Clearance 66 Thimble pin 67 Interface 7 External thread section 71 Interface end face 72 Valve part 73 External fittings 81 External fittings 82 Connector 821 Short core 91 Screw sleeve 92 Thread section 921 Flange 922 Pipe fitting 93 Interface 94 Leakage washer 95

Figure 1 is a schematic diagram of an exploded section of the first embodiment of the present invention; Figure 2 is a combined cross-sectional schematic diagram of the first embodiment of the present invention, and also shows a way of use; Figure 3 is a combined cross-sectional schematic diagram of the first embodiment of the present invention, and also shows another way of use; Figure 4 is a schematic cross-sectional view of the second embodiment of the present invention; Figure 5 is a schematic cross-sectional view of the third embodiment of the present invention; Figure 6 is a schematic diagram of an exploded section of the fourth embodiment of the present invention; Figure 7 is a combined cross-sectional schematic view of the fourth embodiment of the present invention, and also shows a way of use; Figure 8 is a combined cross-sectional schematic diagram of the fourth embodiment of the present invention, and shows another way of use; Figure 9 is a schematic cross-sectional view of the fifth embodiment of the present invention; Figure 10 is a schematic cross-sectional view of the sixth embodiment of the present invention; Figure 11 is a schematic cross-sectional view of a conventional joint structure.

Screw sleeve 1 Through hole 11 Inner flange 13 Second leak stop ring 14 Die 2 Head 21 Tail 22 The first leak stop ring 24 Die end face 25 Clearance 26 Interface 3 Interface end face 32 External fittings 41

Claims (8)

A joint structure, which includes: a threaded sleeve with a through hole, one end of which is provided with a connecting portion for connecting with an interface of an external device, and an inner flange protruding from the other end towards the center of the through hole; A tube core, which includes a head and a tail protruding from the head to one side, the head is movably accommodated in the through hole of the screw sleeve and is stopped by the inner flange, the head At least one first anti-leakage ring is arranged between the wall surface of the through hole, the first anti-leakage ring abuts against the peripheral wall of the through hole, the tail protrudes from the through hole, the head has a die end surface, the interface There is an interface end surface; when the threaded sleeve is fastened to the interface by the connecting part, there is a gap between the end surface of the tube core and the interface end surface, so that the head of the tube core is not fixed on the interface, the The tube core can still move relative to the screw sleeve. The joint structure according to claim 1, wherein the head or the wall of the through hole is provided with at least one groove for accommodating the first anti-leakage ring. The joint structure according to claim 1, wherein at least one second leak-proof ring is provided between the threaded sleeve and the interface. The joint structure according to claim 1, wherein the connecting portion of the threaded sleeve is an internal thread section for screwing with an external thread section of the interface. The joint structure as described in claim 1, wherein the connecting portion of the threaded sleeve is an external thread section for screwing with an internal thread section of the interface. The joint structure as claimed in item 4 or 5, wherein, the head of the pipe core is provided with a thimble, which is used to control a valve provided at the joint. The joint structure as claimed in claim 1, wherein the tail of the die protrudes from the through hole and can be used to connect to an external pipe or an external pipe with a joint. The joint structure as described in Claim 1, wherein, the wall surface of the through hole has a step surface formed due to the difference in inner diameter, and a leak-proof gasket is provided in the through-hole, and the leak-proof gasket has an outer diameter edge A radially expanding bottom is positioned by the bottom abutting against the stepped surface.

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