Sealing device

Abstract

The utility model discloses a sealing device which comprises an outer pipe, an inner pipe, a gland, a breather pipe, a first sealing ring and a second sealing ring. The first end part of the inner pipe is inserted into the second end part of the outer pipe; the gland sleeves the periphery of the second end of the outer pipe and is detachably connected with the outer pipe, the end, away from the second end, of the gland extends towards the outer wall of the inner pipe, and the gland, the outer wall of the inner pipe and the end face of the second end define a sealing cavity; the breather pipe is connected with the gland, one end of the breather pipe communicates with the sealing cavity, and the breather pipe is used for introducing protective gas into the sealing cavity; the first sealing ring and the second sealing ring are both arranged in the sealing cavity and both arranged outside the inner pipe in a sleeving mode, the first sealing ring abuts against the end face of the second end and the outer wall of the inner pipe at the same time, and the second sealing ring abuts against the inner wall of the gland and the outer wall of the inner pipe at the same time. According to the scheme, the sealing effect can be guaranteed, and the probability that the interior of equipment is polluted by air is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sealing devices, in particular to a sealing device. BACKGROUND

[0002] At the connection of two mutually sleeved vent pipes, a plug-in side sealing structure is usually needed to seal, so as to avoid the leakage of gas in the vent pipe and the entry of external air into the vent pipe.

[0003] The existing plug-in side sealing structure realizes sealing by extruding an O-shaped sealing ring. However, when a negative pressure is formed in the vent pipe, once the O-shaped sealing ring fails, external air will enter the vent pipe, resulting in air pollution in the vent pipe. CONTENT OF THE UTILITY MODEL

[0004] The present application mainly solves the technical problem of providing a sealing device to ensure sealing effect and reduce the probability of air pollution in the equipment.

[0005] To solve the above technical problem, one technical solution adopted by the present application is to provide a sealing device, comprising an outer pipe, an inner pipe, a gland, a vent pipe, a first sealing ring and a second sealing ring; the first end of the inner pipe is inserted into the second end of the outer pipe; the gland is sleeved on the periphery of the second end of the outer pipe, the gland is detachably connected with the outer pipe, and the end of the gland away from the second end extends towards the outer wall of the inner pipe, the gland and the outer wall of the inner pipe and the end face of the second end jointly form a sealing cavity; the vent pipe is connected with the gland, and one end of the vent pipe is in communication with the sealing cavity, the vent pipe is used to introduce protective gas into the sealing cavity; the first sealing ring and the second sealing ring are both arranged in the sealing cavity and both are sleeved on the outer pipe, and the first sealing ring is in abutment with the end face of the second end and the outer wall of the inner pipe, and the second sealing ring is in abutment with the inner wall of the gland and the outer wall of the inner pipe.

[0006] Preferably, the sealing device further comprises a support ring, the support ring is located in the sealing cavity, the support ring is sleeved on the outer pipe, one side of the support ring facing the end face of the second end is provided with a first sealing groove surrounding the inner pipe, and the other side of the support ring away from the end face of the second end is provided with a second sealing groove surrounding the inner pipe, the first sealing ring is arranged in the first sealing groove, and the second sealing ring is arranged in the second sealing groove.

[0007] Preferably, the support ring comprises a ring body, a first baffle and a second baffle, the ring body is sleeved outside the inner tube, the first baffle is arranged on one side of an end face of the ring body facing the second end portion and surrounds the inner tube, the second baffle is arranged on one side of an end face of the ring body away from the second end portion and surrounds the inner tube, the first baffle and the ring body form the first sealing groove, and the second baffle and the ring body form the second sealing groove.

[0008] Preferably, the first baffle and the second baffle are located at one end of the ring body away from the inner tube.

[0009] Preferably, a height of the first baffle in an axial direction of the inner tube is less than a thickness of the first sealing ring in the axial direction, and a height of the second baffle in the axial direction is less than a thickness of the second sealing ring in the axial direction.

[0010] Preferably, the ring body is provided with a vent hole, and the vent hole communicates an inner side wall and an outer side wall of the ring body.

[0011] Preferably, the vent hole is a plurality of, and the plurality of vent holes are distributed along a circumferential direction of the ring body.

[0012] Preferably, the vent holes are uniformly distributed along the circumferential direction of the ring body.

[0013] Preferably, a side plate of the gland is provided with a through hole, and the vent pipe communicates with the through hole.

[0014] Preferably, the gland is threadedly connected with the outer tube.

[0015] The beneficial effects of the present application are: different from the prior art, the sealing device provided by the present application is provided with two sealing rings in the sealing cavity, and a vent pipe communicating with the sealing cavity is arranged. When the gland is fastened on the second end portion of the outer tube, the top plate of the gland presses the two sealing rings against the end face of the second end portion. At this time, the first sealing ring simultaneously abuts against the end face of the second end portion and the outer wall of the inner tube, and the second sealing ring simultaneously abuts against the inner wall of the gland and the outer wall of the inner tube, thereby realizing double sealing. In the case that the two sealing rings are intact, the protective gas cannot leak outwards from the sealing cavity, that is, the sealing structure does not consume the protective gas. In the internal pressure state, that is, when the gas pressure in the tube is greater than the gas pressure outside the tube, there is no need to ventilate the sealing cavity through the vent pipe. Even if the sealing ring fails, external air cannot be sucked into the inner tube and the outer tube. In the negative pressure state, that is, when the gas pressure in the tube is less than the gas pressure outside the tube, the same gas as in the tube is introduced into the sealing cavity through the vent pipe, thereby forming a protective gas layer in the sealing cavity to isolate the gas in the tube from the external air. When the sealing ring fails, the probability of air entering the device due to negative pressure is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic view of an embodiment of the sealing device of the present application;

[0017] Figure 2 is Figure 1 is a partial enlarged schematic view of A in FIG. 10. The sealing device 10 comprises an outer tube 11, an inner tube 12, a gland 13, a breather tube 14, a first sealing ring 15 and a second sealing ring 16.

[0018] Figure 3 is a top view of an embodiment of the support ring of the present application. DETAILED DESCRIPTION

[0019] For the purpose of making the object, technical solutions and effects of the present application more clear and explicit, the present application is further described in detail below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0020] Referring to Figure 1 and Figure 2 , Figure 1 is a structural schematic view of an embodiment of the sealing device of the present application, Figure 2 is Figure 1 is a partial enlarged schematic view of A in FIG. 10. The sealing device 10 comprises an outer tube 11, an inner tube 12, a gland 13, a breather tube 14, a first sealing ring 15 and a second sealing ring 16.

[0021] The inner tube 12 and the outer tube 11 both extend along the axial direction (indicated by Z in the figure), and the first end 12a of the inner tube 12 is inserted into the second end 11a of the outer tube 11.

[0022] The cover 13 is sleeved on the periphery of the second end portion 11a of the outer tube 11, and the cover 13 is detachably connected with the outer tube 11, and an end of the cover 13 away from the second end portion 11a extends to the outer wall of the inner tube 12, and the cover 13, together with the outer wall of the inner tube 12 and the end face of the second end portion 11a, forms a sealed cavity 101. Specifically, the cover 13 includes a top plate 131 and a side plate 132 sleeved on the edge of the top plate 131, the top plate 131 is located on the side of the second end portion 11a away from the outer tube 11, and the top plate 131 is arranged substantially parallel to the end face of the second end portion 11a, and the top plate 131 is provided with a insertion hole in the center, and the inner tube 12 is arranged in the insertion hole, and the side plate 132 is located on the side of the top plate 131 facing the second end portion 11a, and extends to the outer tube 11 and is detachably connected with the outer tube 11. Alternatively, the side plate 132 of the cover 13 can be threadedly connected with the outer tube 11, and the cover 13 is fastened and separated with the outer tube 11 by forward rotation and reverse rotation, and the top plate 131, the part of the side plate 132 close to the top plate 131 and the part of the outer wall of the inner tube 12 close to the second end portion 11a form the sealed cavity 101. The part of the inner tube 12 away from the first end portion 12a extends to the side away from the outer tube 11 and is exposed to the outer tube 11 and the cover 13.

[0023] The vent pipe 14 is connected with the cover 13, and one end of the vent pipe 14 communicates with the sealed cavity 101, and the vent pipe 14 is used for introducing protective gas into the sealed cavity 101, and the protective gas is the same as the gas introduced into the inner tube 12 and the outer tube 11. Alternatively, the side plate 132 of the cover 13 is provided with a through hole 111, the vent pipe 14 communicates with the through hole 111, and the side edge of the cover 13 is convenient for connecting the vent pipe 14, and in other embodiments, the through hole 111 can also be arranged on the top plate 131.

[0024] The first sealing ring 15 and the second sealing ring 16 are both arranged in the sealed cavity and both 161 are sleeved on the outer tube 12, and the first sealing ring 15 simultaneously abuts against the end face of the second end portion 11a and the outer wall of the inner tube 12, and the second sealing ring 16 simultaneously abuts against the inner wall of the cover 13 and the outer wall of the inner tube 12. The first sealing ring 15 and the second sealing ring 16 are both O-rings, the first sealing ring 15 is used for sealing the gap between the inner tube 12 and the outer tube 11, and the second sealing ring 16 is used for sealing the gap between the cover 13 and the inner tube 12.

[0025] The sealing device 10 of the present application is provided with two sealing rings in the sealing cavity 101, and a ventilation pipe 14 is arranged to communicate with the sealing cavity 101. When the gland 13 is fastened on the second end portion 11a of the outer pipe 11, the top plate 131 of the gland 13 will press the two sealing rings against the end face of the second end portion 11a. At this time, the first sealing ring 15 is in abutment with the end face of the second end portion 11a and the outer wall of the inner pipe 12 at the same time, and the second sealing ring 16 is in abutment with the inner wall of the gland 13 and the outer wall of the inner pipe 12 at the same time, thereby achieving double sealing. In the case that the two sealing rings are intact, the protective gas will not leak outwards from the sealing cavity 101, that is, the sealing structure does not consume the protective gas. In the case of internal pressure, that is, the gas pressure in the pipe is greater than the gas pressure outside the pipe, there is no need to ventilate the sealing cavity 101 through the ventilation pipe, and even if the sealing ring fails, the outside air will not be sucked into the inner pipe 12 and the outer pipe 11. In the case of negative pressure, that is, the gas pressure in the pipe is less than the gas pressure outside the pipe, the same gas as in the pipe is ventilated into the sealing cavity 101 through the ventilation pipe 14, and a protective gas layer is formed in the sealing cavity 101 to isolate the gas in the pipe from the outside air. When the sealing ring fails, the probability of air entering the device due to negative pressure and causing pollution is reduced.

[0026] Optionally, continuing to refer to Figure 1 and Figure 2 , the sealing device 10 further comprises a support ring 17, which is located in the sealing cavity 101 and is sleeved outside the inner pipe 12. The inner diameter of the support ring 17 is slightly larger than the outer diameter of the inner pipe 12, that is, the support ring 17 is in clearance fit with the inner pipe 12. The side of the support ring 17 facing the end face of the second end portion 11a is provided with a first sealing groove 17a surrounding the inner pipe 12, and the side of the support ring 17 facing away from the end face of the second end portion 11a is provided with a second sealing groove 17b surrounding the inner pipe 12. The first sealing ring 15 is arranged in the first sealing groove 17a, and the second sealing ring 16 is arranged in the second sealing groove 17b. The two sealing grooves are used to limit the two sealing rings, respectively, to ensure that after the gland 13 is fastened with the outer pipe 11, the first sealing ring 15 can accurately seal the gap between the inner pipe 12 and the outer pipe 11, and the second sealing ring 16 can accurately seal the gap between the inner pipe 12 and the top plate 131 of the gland 13.

[0027] Optionally, refer to Figure 2 and Figure 3 , Figure 3is a top view of an embodiment of the support ring of the present application. The support ring 17 comprises a ring body 171, a first baffle 172 and a second baffle 173, the ring body 171 is sleeved outside the inner tube 12, the first baffle 172 is arranged on one side of the end face of the ring body 171 facing the second end 11a and surrounds the inner tube 12, and the second baffle 173 is arranged on one side of the end face of the ring body 171 away from the second end 11a and surrounds the inner tube 12. The first baffle 172 and the ring body 171 form a first sealing groove 17a, and the second baffle 173 and the ring body 171 form a second sealing groove 17b. When the gland 13 is fastened with the outer tube 11, the end face of the second end 11a of the gland 13 and the outer tube 11 extrudes the first sealing ring 15 and the second sealing ring 16 in the axial direction, so that the first sealing ring 15 and the second sealing ring 16 expand in the radial direction, at this time, the first baffle 172 abuts against the outside of the first sealing ring 15, i.e. on the side away from the inner tube 12, the first baffle 172 applies pressure to the first sealing ring 15 towards the inner tube 12, ensuring sealing; the second baffle 173 abuts against the outside of the second sealing ring 16, i.e. on the side away from the inner tube 12, the second baffle 173 applies pressure to the second sealing ring 16 towards the inner tube 12, ensuring sealing. Optionally, the first baffle 172 and the second baffle 173 are both located at the end of the ring body 171 away from the inner tube 12, providing sufficient installation space for the sealing rings, in other embodiments, the first baffle 172 and the second baffle 173 can also be arranged at the middle section of the ring body 171. Optionally, the height of the first baffle 172 in the axial direction is less than the thickness of the first sealing ring 15 in the axial direction, and the height of the second baffle 173 in the axial direction is less than the thickness of the second sealing ring 16 in the axial direction. It is ensured that the first sealing ring 15 and the second sealing ring 16 can still abut against the end face of the second end 11a and the inner wall of the top plate 131 of the gland 13 after being extruded in the axial direction. Specifically, the ring body 171 can be a symmetrical structure, the first baffle 172 and the second baffle 173 are completely the same in structure, and the height thereof in the axial direction can be 0.65mm-0.7mm, the size of the first sealing ring 15 and the second sealing ring 16 can be completely the same, and the thickness thereof in the axial direction, i.e. the diameter of the cross section parallel to the axial direction, is 2mm-3.5mm. The material of the support ring 17 can be metal.

[0028] Optionally, referring to Figure 2 and Figure 3 , the ring body 171 is provided with a vent hole 174, which communicates the inner side wall and the outer side wall of the ring body 171. Specifically, the vent hole 174 penetrates the ring body 171 in the radial direction. The vent hole 174 is used to introduce protective gas into the gap between the first sealing ring 15 and the second sealing ring 16, and the protective gas can fill the space around the first sealing ring 15 and the second sealing ring 16, so that when any one or both of the sealing rings fail, the protective gas can always isolate the gas in the tube from the air outside the tube, avoiding air pollution of the substances in the tube.

[0029] Optionally, the number of the vent holes 174 is multiple, and the multiple vent holes 174 are distributed along the circumference of the ring body 171. Specifically, the number of the vent holes 174 is four, and the four vent holes 174 are evenly distributed along the circumference of the ring body 171. This ensures that the protective gas can be filled along the circumference to the space between the first sealing ring 15 and the second sealing ring 16. In other embodiments, the number of the vent holes 174 can be other, which is not limited in the present application.

Claims

1. A sealing device, characterized in that The sealing device comprises: an outer tube; an inner tube, a first end of the inner tube being inserted into a second end of the outer tube; a gland, the gland being sleeved on the periphery of the second end of the outer tube, the gland being detachably connected with the outer tube, and an end of the gland away from the second end extending towards the outer wall of the inner tube, the gland, the outer wall of the inner tube and the end face of the second end forming a sealed cavity; an air pipe, the air pipe being connected with the gland, and one end of the air pipe being in communication with the sealed cavity, the air pipe being used for introducing protective gas into the sealed cavity; a first sealing ring and a second sealing ring, the first sealing ring and the second sealing ring being arranged in the sealed cavity and being sleeved on the outer wall of the inner tube, and the first sealing ring being in abutment with the end face of the second end and the outer wall of the inner tube, and the second sealing ring being in abutment with the inner wall of the gland and the outer wall of the inner tube.

2. The sealing device according to claim 1, wherein a support ring is arranged in the sealed cavity, the support ring being sleeved on the outer wall of the inner tube, and a side of the support ring facing the end face of the second end being provided with a first sealing groove surrounding the inner tube, and a side of the support ring away from the end face of the second end being provided with a second sealing groove surrounding the inner tube, the first sealing ring being arranged in the first sealing groove, and the second sealing ring being arranged in the second sealing groove.

3. The sealing device according to claim 2, wherein the support ring comprises a ring body, a first baffle and a second baffle, the ring body being sleeved on the outer wall of the inner tube, the first baffle being arranged on a side of the ring body facing the end face of the second end and surrounding the inner tube, and the second baffle being arranged on a side of the ring body away from the end face of the second end and surrounding the inner tube, the first baffle and the ring body forming the first sealing groove, and the second baffle and the ring body forming the second sealing groove.

4. The sealing device according to claim 3, wherein the first baffle and the second baffle are both arranged at an end of the ring body away from the inner tube.

5. The sealing device according to claim 3, wherein a height of the first baffle in an axial direction of the inner tube is less than a thickness of the first sealing ring in the axial direction, and a height of the second baffle in the axial direction is less than a thickness of the second sealing ring in the axial direction.

6. The sealing device according to claim 3, wherein an air hole is arranged on the ring body, the air hole being in communication with an inner side wall and an outer side wall of the ring body.

7. The sealing device according to claim 6, wherein a plurality of air holes are arranged on the ring body, the plurality of air holes being distributed in a circumferential direction of the ring body.

8. The sealing device according to claim 7, wherein the air holes are uniformly distributed in the circumferential direction of the ring body.

9. The sealing device according to claim 1, wherein a through hole is arranged on a side wall of the gland, and the air pipe is in communication with the through hole.

10. The sealing device according to claim 1, wherein the gland is threadedly connected with the outer tube.

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