A bellows with high sealing performance

Abstract

The present invention discloses a bellows with high airtightness, which belongs to the technical field of bellows. The bellows comprises a bellows and a connecting pipe arranged at one end of the bellows, wherein the connecting pipe is provided with a threaded pipe that matches with the thread of an external pipe, a collar is installed between the connecting pipe and the threaded pipe, and a sealing gasket is provided in the connecting pipe; by providing multiple groups of push rods, the push rod at the tail end and the collar can be disengaged from the clamping relationship, when the top end of the tail end moves to the recess of the bellows or the pipe, the push rod will be completely disengaged from the collar and staggered, so that the collar can rotate independently relative to the push rod at the tail end, and in this process, the pressure of the pressure strip on the push rod can prompt the pressure head to further squeeze the rubber gasket, so that the rubber gasket expands toward the recess of the bellows or the pipe, thereby further sealing the bellows and the pipe.

Description

Technical Field

[0001] The present invention relates to the technical field of bellows, in particular to a bellows with high airtightness. Background Art

[0002] The bellows sealing structure generally includes a joint assembly that is sleeved onto the bellows. In order to improve the sealing performance of the joint assembly after it is connected to the bellows, a sealing treatment needs to be performed through the sealing structure.

[0003] Chinese patent CN211289071U discloses a simple sealing joint for a bellows. After a sealing ring mounted on an inclined platform is in close contact with the inner wall of the bellows port, a clamping ring composed of two clamping blocks is pressed by a fastening sleeve, so that the clamping ring applies pressure to the bellows and can tightly press the bellows, so that the bellows can be more closely in contact with the sealing ring after being pressurized, and the sealing effect is better.

[0004] The above-mentioned device seals the connection of the bellows by means of a sealing ring. However, in actual use, when there is a recessed portion on the end face of the bellows or the end face of the pipe to be connected, the contact between the sealing gasket and the recessed portion is not tight enough, allowing the fluid to leak from the recessed portion. In summary, there is still room for improvement in the above-mentioned device.

[0005] Therefore, it is necessary to provide a bellows with high airtightness to solve the above technical problems. Summary of the Invention

[0006] The object of the present invention is to provide a bellows with high airtightness to solve the problem that the existing device proposed in the above background technology seals the connection of the bellows by setting a sealing ring, but in actual use, when there is a recessed part on the end face of the bellows or the end face of the pipe to be connected, the contact between the sealing gasket and the recessed part is not tight enough, allowing the fluid to leak from the recessed part.

[0007] Based on the above ideas, the present invention provides the following technical solutions: a bellows with high airtightness, comprising a bellows and a connecting pipe provided at one end of the bellows, wherein a threaded pipe that cooperates with an external pipe thread is provided at one end of the connecting pipe, a collar is installed between the connecting pipe and the threaded pipe, a sealing gasket is provided in the connecting pipe, multiple groups of top pressure components are clamped on the inner wall of the collar, and a pressure strip that cooperates with the top pressure components is fixedly provided on the inner wall of the collar;

[0008] When the pressing assembly is disconnected from the collar and remains between the connecting pipe and the threaded pipe, the collar drives the pressure strip to rotate, and the pressure strip can squeeze the pressing assembly remaining between the connecting pipe and the threaded pipe.

[0009] As a further solution of the present invention: a surface of the pressure strip close to the top pressing component is an inclined arc surface.

[0010] As a further solution of the present invention: the pushing assembly includes a push rod, a groove that slides with the push rod is opened on the inner wall of the collar, so that the top end of the push rod extends into the groove and elastically cooperates with the collar, and a positioning block is elastically installed on the outer side of the push rod and near the top end, and a positioning groove that cooperates with the positioning block is opened on the inner wall of the groove. In the initial state, except for the positioning block on the tail end push rod, the positioning blocks on the other push rods are in a pop-up state and inserted into the positioning groove, and a clamping strip is elastically installed on one side of the push rod close to the threaded tube, and the end face of the threaded tube close to the connecting tube is recessed inward to form an annular recessed portion, and a plurality of stop rods that cooperate with the clamping strip are integrally formed at the recessed portion, and a plurality of stop blocks are integrally formed at the recessed portion, and the stop block is located between two adjacent stop rods, and the top end of the stop block is set as an inclined surface.

[0011] As a further solution of the present invention: an annular opening is provided on the outer peripheral surface of the sealing gasket, and the cross section of the opening is set to be Y-shaped. The end of the push rod away from the ring is provided with a pressure head that matches the opening, and the cross section of the pressure head is triangular.

[0012] As a further solution of the present invention: a traction block is elastically installed on one side of the push rod, and a pull rope is fixedly arranged between the traction block and the positioning block. Except for the traction block at the tail end push rod which is in a pop-up state, the traction blocks on the other multiple push rods are squeezed by the previous push rod and are in a retracted state.

[0013] As a further solution of the present invention: a positioning rod is provided on the push rod at the tail end, and the positioning rod is threadedly connected to the push rod at the tail end.

[0014] As a further solution of the present invention: a circular hole is provided on the push rod and is slidably matched with the traction block. A spring is fixedly provided between the inner end surface of the circular hole and the traction block.

[0015] As a further solution of the present invention: the pressure head is elastically installed below the push rod.

[0016] As a further solution of the present invention: a slide groove is provided on the top surface of the pressure head, and a slider that slides with the slide groove is fixedly provided on the bottom end surface of the push rod. A guide rod is fixed in the slide groove, and the guide rod passes through the slider and slides with the slider, and a second spring is fixed between the slider and the end surface of the slide groove.

[0017] As a further solution of the present invention: two clamping rings are fixedly installed on the inner wall of the ring, and an annular clamping groove is opened on the outer circumference of the connecting pipe and the threaded pipe. The cross-sections of the clamping groove and the clamping ring are both set to T shape, and the clamping ring is rotatably set in the clamping groove.

[0018] Compared with the prior art, the beneficial effect of the present invention is that: this device is provided with multiple groups of push rods, and the push pipe at the tail end and the collar can be disengaged from the clamping relationship. When the top end of the tail end moves to the recess of the corrugated pipe or the pipe, the push rod will be completely disconnected from the collar and staggered, so that the collar can rotate independently relative to the push rod at the tail end. In this process, the pressure of the pressure strip on the push rod can prompt the pressure head to further squeeze the rubber pad, so that the rubber pad expands toward the recess of the corrugated pipe or the pipe, thereby further sealing the bellows and the pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and examples.

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 is a schematic diagram of the position of the sealing gasket of the present invention;

[0022] Figure 3 It is a schematic diagram of the position of the ejector pin of the present invention;

[0023] Figure 4 This invention Figure 3 A schematic diagram of the enlarged structure at point A;

[0024] Figure 5 Schematic diagram of the cooperation between the sealing gasket and the ejector rod of the present invention;

[0025] Figure 6 This invention Figure 5 A schematic diagram of the enlarged structure at point B;

[0026] Figure 7 It is a schematic diagram of the draw cord structure of the present invention;

[0027] Figure 8 This is a schematic diagram of the connecting pipe and the limiting ring structure of the present invention;

[0028] Figure 9 is a cross-sectional view of the connecting pipe and rubber pad of the present invention;

[0029] Figure 10 This invention Figure 9 Schematic diagram of the enlarged structure at C;

[0030] Figure 11 It is a schematic diagram of the structure of the baffle rod and the baffle block of the present invention;

[0031] Figure 12 It is a schematic diagram of the snap ring structure of the present invention.

[0032] In the figure: 1. bellows; 2. connecting pipe; 201. boss; 3. collar; 301. retaining ring; 4. threaded pipe; 5. pipe; 6. sealing gasket; 601. opening; 7. ejector pin; 701. pressure head; 8. pressure strip; 801. arc surface; 9. retaining strip; 10. positioning block; 11. positioning rod; 12. traction block; 13. pull rope; 14. limiting ring; 15. locking screw; 16. magnet; 17. stop rod; 18. stop block; 1801. inclined surface; 19. slider. DETAILED DESCRIPTION

[0033] like Figure 1-Figure 4 As shown, a bellows with high airtightness includes a bellows 1 and a connecting pipe 2 arranged at one end of the bellows 1. The end of the connecting pipe 2 away from the bellows 1 is provided with a threaded pipe 4 that is threadedly matched with an external pipe 5. Specifically, a collar 3 is installed between the connecting pipe 2 and the threaded pipe 4. The collar 3 is arranged on the outside of the connecting pipe 2 and the bellows 1 and can rotate relative to both. A sealing gasket 6 is provided in the connecting pipe 2, and the sealing gasket 6 is located at the end of the bellows 1. In actual use, the threaded pipe 4 is sleeved on the external pipe 5, and the bellows 1 is gradually driven close to the pipe 5 by rotating the threaded pipe 4, so that the sealing gasket 6 is pressed between the bellows 1 and the pipe 5.

[0034] When the end face of the bellows 1 is not very flat, the contact between the sealing gasket 6 and the end face of the bellows 1 is not tight enough.

[0035] Reference Figure 4 As shown, the side of the pressure strip 8 close to the top pressure assembly is an inclined arc surface 801 (the height of the end of the pressure strip 8 close to the top rod 7 is lower than the height of the end of the pressure strip 8 away from the top rod 7), so that when the ring 3 drives the pressure strip 8 to rotate, the pressure strip 8 can gradually squeeze the top pressure assembly.

[0036] like Figures 1-11As shown, the above-mentioned pressing assembly includes a push rod 7, and a groove that slides with the push rod 7 is opened on the inner wall of the collar 3, so that the top of the push rod 7 extends into the groove, and a positioning block 10 is elastically installed on the outer side of the push rod 7 and near the top. A positioning groove that cooperates with the positioning block 10 is opened on the inner wall of the groove. In the initial state, except for the positioning block 10 on the push rod 7 at the tail end, the positioning blocks 10 on the other push rods 7 are in a pop-up state and inserted into the positioning groove;

[0037] Furthermore, a magnetic block 16 is fixedly installed at the inner end surface of the groove, and a magnet that matches the magnetic block 16 is fixedly embedded at the top end surface of the push rod 7. The magnetic block 16 has the same magnetic pole on the side opposite to the magnet. Through this structure, when one end of the positioning block 10 is moved out of the positioning groove, the repulsive force between the magnet and the magnetic block 16 can drive the push rod 7 close to the sealing gasket 6. Of course, in actual use, a limit spring can also be fixedly installed at the inner end surface of the groove, and the pressure of the limit spring on the push rod 7 can also prompt the top end of the push rod 7 to move out of the groove.

[0038] In order to lock the ejector rod 7 that is out of the collar 3, a clamping strip 9 is elastically installed on one side of the ejector rod 7 close to the threaded tube 4, and the end surface of the threaded tube 4 close to the connecting tube 2 is recessed inward to form an annular recessed portion, and a plurality of blocking rods 17 that cooperate with the clamping strip 9 are integrally formed in the recessed portion. Figure 11 As shown, a plurality of stops 18 are integrally formed at the recessed portion, the stop block 18 is located between two adjacent stop rods 17, and the top end of the stop block 18 is set as a slope 1801. In actual application, when the positioning block 10 is disengaged from the positioning groove and the push rod 7 moves relative to the collar 3, the clip 9 on the push rod 7 can move between the two adjacent stop rods 17. The stop rod 17 limits the clip 9, which can prevent the push rod 7 from continuing to rotate. When the clip 9 moves to below the stop block 18, the push rod 7 is completely locked between the connecting pipe 2 and the threaded pipe 4.

[0039] Reference Figure 9-10 As shown, an annular opening 601 is provided on the outer peripheral surface of the sealing gasket 6, and the cross section of the opening 601 is set to be Y-shaped, and the end of the above-mentioned push rod 7 away from the ring 3 is provided with a pressure head 701 that matches the opening 601, and the cross section of the pressure head 701 is triangular. Through this structure, when the push rod 7 drives the pressure head 701 to squeeze the sealing gasket 6, it can cause the sealing gasket 6 to deform to both sides, so that it can contact the end faces of the bellows 1 and the pipe 5 more closely. Of course, during specific use, by controlling the inclination angle of the inclined surface 1801 at the opening 601 of the sealing gasket 6, the pressure exerted by the pressure head 701 on the sealing gasket 6 can be decomposed into two forces in the horizontal and vertical directions, and the component force in the vertical direction is smaller than the friction between the sealing gasket 6 and the connecting pipe 2 and the pipe 5.

[0040] Reference Figure 5-Figure 7 As shown, a traction block 12 is elastically installed on one side of the top rod 7, and a pull rope 13 is fixedly arranged between the traction block 12 and the positioning block 10. The pull rope 13 passes through the top rod 7 and slides with it. In the initial state, multiple top rods 7 are in contact with each other. Except for the traction block 12 at the top rod 7 at the tail end, which is in a pop-up state, the traction blocks 12 on the other multiple top rods 7 are squeezed by the previous top rod 7 and are in a contracted state.

[0041] Reference Figure 5-Figure 6 、 Figure 9 As shown, in order to position the top rod 7 at the tail end, a positioning rod 11 can be provided at the top rod 7 at the tail end. The positioning rod 11 extends to the top rod 7 at the tail end and is threadedly connected thereto.

[0042] In actual use, the threaded tube 4 is placed on the outside of the pipe 5 to be connected, and the threaded tube 4 is rotated. Since the threaded tube 4 and the pipe 5 are threadedly connected, the corrugated tube 1 can be gradually driven closer to the pipe 5 during the rotation of the threaded tube 4, so that the sealing gasket 6 is located between the corrugated tube 1 and the pipe 5. Then, the positioning rod 11 is rotated to separate the positioning rod 11 and the push rod 7 at the tail end. When the push rod 7 is separated from the push rod 7 at the tail end, the push rod 7 at the tail end tends to move relative to the collar 3.

[0043] When there is a depression on the end face of the bellows 1 or the end face of the pipe 5, the push rod 7 rotates to the depression with the collar 3, and the repulsive force between the magnetic block 16 and the magnet can drive the push rod 7 at the tail end to move toward the direction close to the rubber pad. When the top end of the push rod 7 moves out of the groove, the clamping strip 9 on the push rod 7 is between the two stop rods 17, and the stop rod 17 can prevent the push rod 7 from continuing to rotate. At this time, during the rotation of the collar 3, the pressure strip 8 on the inner wall of the collar 3 will squeeze the push rod 7 and drive it to move further toward the rubber pad, thereby squeezing the rubber pad to open the opening of the rubber pad. The outward movement of the portion 601 facilitates a tighter fit between the rubber pad and the end face of the bellows 1 or the end face of the pipe 5. When the clip 9 passes over the push rod 7 at the tail end, the clip 9 on the push rod 7 at the tail end will pass through the inclined surface 1801 and pass over the stopper 18. At this time, the cooperation between the stopper 18 and the stopper 17 can lock the top end of the tail end between the connecting pipe 2 and the threaded pipe 4. At this time, the push rod 7 at the tail end can squeeze the rubber pad through the pressure head 701, so that the opening 601 of the rubber pad can expand toward the recessed portion, thereby further sealing the bellows 1 and the pipe 5.

[0044] Since the push rod 7 at the tail end is retained between the connecting tube 2 and the threaded tube 4, the push rod 7, which was originally at the second-to-last position, moves to the tail end position, so that the traction block 12 on this push rod 7 can pop out. In the process of the traction block 12 popping out, the positioning block 10 can be pulled out of the positioning groove by the pull rope 13, thereby causing the push rod 7 to be disengaged from the collar 3. When there is another depression on the end face of the corrugated pipe 1 or the pipe 5, the push rod 7 will still be retained in the depression when it moves to the depression, thereby further squeezing the push rod 7 through the pressure strip 8 on the inner wall of the collar 3, thereby causing the sealing gasket 6 to deform and contact more closely with the end faces of the corrugated pipe 1 and the pipe 5.

[0045] To sum up, this device is provided with multiple groups of push rods 7, and the push pipe at the tail end and the ring 3 can be disengaged from the clamping relationship. When the push rod 7 at the tail end moves to the recess of the bellows 1 or the pipe 5, the push rod 7 will be completely disconnected from the ring 3 and staggered, so that the ring 3 can rotate independently relative to the push rod 7 at the tail end. During this process, the pressure of the pressure strip 8 on the push rod 7 can prompt the pressure head 701 to further squeeze the rubber pad, so that the rubber pad expands toward the recess of the bellows 1 or the pipe 5, thereby further sealing the bellows 1 and the pipe 5.

[0046] like Figure 7 As shown, a circular hole is provided on the push rod 7 for sliding engagement with the traction block 12 , and a spring is fixedly provided between the inner end surface of the circular hole and the traction block 12 .

[0047] Reference Figure 1-Figure 4 、 Figure 8 As shown, one end surface of the connecting pipe 2 extends inward to form a boss 201. In order to connect the connecting pipe 2 and the bellows 1, in actual use, it is necessary to install a limit ring 14 between the two annular protrusion structures on the outside of the bellows 1. The limit ring 14 is semi-annular. Specifically, during the installation process, the connecting pipe 2 is first sleeved on the end of the bellows 1, and then the two semi-annular limit rings 14 are clamped between the two adjacent protrusion structures on the outside of the bellows 1, and the outer diameter of the two limit rings 14 after enclosing is larger than the inner diameter of the boss 201. Through this structure, when the threaded pipe 4 is threadedly engaged with the pipe 5, the bellows 1 can be pulled gradually close to the pipe 5 through the connecting pipe 2, and the above-mentioned rubber pad needs to be placed in the connecting pipe 2 and at the end of the bellows 1 during installation. At the same time, the multiple push rods 7 on the inner wall of the ring 3 also need to be inserted into the opening 601 of the sealing gasket 6 in the initial state.

[0048] like Figure 1-Figure 3 、 Figure 10 As shown, the positioning rod 11 can pass through the collar 3 and be threadedly connected thereto. In order for the positioning rod 11 to cooperate with the top rod 7 at the tail end, the magnet at the top rod 7 at the tail end and the magnetic block 16 above the top rod 7 can both be set to be ring-shaped.

[0049] The side of the push rod 7 is provided with an installation groove that slides with the positioning block 10 and the clamping strip 9. A first spring is fixedly provided between the clamping strip 9 and the inner end surface of the installation groove and between the positioning block 10 and the inner end surface of the installation groove.

[0050] In actual use, the pressure head 701 can be elastically installed under the push rod 7. Specifically, a slide groove can be opened on the top surface of the pressure head 701, and the bottom end surface of the push rod 7 is fixedly provided with a slider 19 that slides with the slide groove. A guide rod is fixedly provided in the slide groove, and the guide rod passes through the slider 19 and slides with it, and a second spring is fixedly provided between the slider 19 and the end surface of the slide groove. The second spring can be sleeved on the outside of the guide rod. Through this structure, the pressure head 701 can move relative to the push rod 7 along the axial direction of the rubber pad. When the push rod 7 drives the pressure head 701 to move downward to squeeze the rubber pad, the pressure head 701 can be laterally offset relative to the push rod 7, so that the rubber pad can be better squeezed.

[0051] Reference Figure 12 As shown, two clamping rings 301 can be fixedly installed on the inner wall of the collar 3, and an annular clamping groove is provided on the outer circumference of the connecting pipe 2 and the threaded pipe 4. The cross-sections of the clamping groove and the clamping ring 301 are both set to T-shape, and the clamping ring 301 is rotatably set in the clamping groove. Through this structure, the collar 3 can be installed between the connecting pipe 2 and the threaded pipe 4. Of course, in actual use, the collar 3 can also cooperate with the connecting pipe 2 and the threaded pipe 4 through a bearing.

[0052] like Figure 1-Figure 3 、 Figure 9 As shown, a locking screw 15 can be set between the collar 3 and the threaded tube 4. Specifically, the locking screw 15 passes through the collar 3 and cooperates with its thread, and the outer circumference of the threaded tube 4 is provided with a socket that cooperates with the locking screw 15. In actual use, the locking screw 15 can be used to achieve docking between the threaded tube 4 and the collar 3.

Claims

1. A bellows with high sealing performance, comprising a bellows and a connecting pipe provided at one end of the bellows, wherein one end of the connecting pipe is provided with a threaded pipe that mates with an external pipe thread, a collar is installed between the connecting pipe and the threaded pipe, and a sealing gasket is provided in the connecting pipe, characterized in that: A plurality of pressing assemblies are clamped on the inner wall of the collar, and a pressure strip cooperating with the pressing assemblies is fixedly provided on the inner wall of the collar; When the pressing assembly is disconnected from the collar and remains between the connecting pipe and the threaded pipe, the collar drives the pressure strip to rotate, and the pressure strip can squeeze the pressing assembly between the connecting pipe and the threaded pipe; The side of the pressure strip close to the top pressing component is an inclined arc surface; The top pressing assembly includes a push rod, the inner wall of the collar is provided with a groove that slidably cooperates with the push rod, so that the top of the push rod extends into the groove and elastically cooperates with the collar, the outer side of the push rod and a positioning block is elastically installed near the top end of the top rod, and the inner wall of the groove is provided with a positioning groove that cooperates with the positioning block. In the initial state, except for the positioning block on the tail end push rod, the positioning blocks on the other push rods are in a pop-up state and inserted into the positioning groove. The push rod is elastically installed at one side of the threaded tube near the threaded tube, and the end face of the threaded tube near the connecting tube is concave inward to form an annular concave portion, and a plurality of stop rods that cooperate with the card strips are integrally formed on the concave portion, and a plurality of stop blocks are integrally formed on the concave portion, and the stop block is located between two adjacent stop rods, and the top of the stop block is set as an inclined surface; An annular opening is provided on the outer peripheral surface of the sealing gasket, and the cross section of the opening is set to be Y-shaped. The end of the push rod away from the ring is provided with a pressure head that matches the opening, and the cross section of the pressure head is triangular.

2. The bellows with high airtightness according to claim 1, characterized in that: A traction block is elastically installed on one side of the push rod, and a pull rope is fixedly arranged between the traction block and the positioning block. Except for the traction block at the tail end push rod which is in a pop-up state, the traction blocks on the other push rods are squeezed by the previous push rod and are in a retracted state.

3. The bellows with high airtightness according to claim 1, characterized in that: A positioning rod is provided on the push rod at the tail end, and the positioning rod is threadedly connected to the push rod at the tail end.

4. The bellows with high airtightness according to claim 2, characterized in that: The push rod is provided with a circular hole which is in sliding cooperation with the traction block, and a spring is fixedly arranged between the inner end surface of the circular hole and the traction block.

5. The bellows with high airtightness according to claim 1, characterized in that: The pressure head is elastically installed below the push rod.

6. The bellows with high airtightness according to claim 5, characterized in that: A slide groove is provided on the top surface of the pressure head, and a slider that slides with the slide groove is fixedly provided on the bottom end surface of the push rod. A guide rod is fixedly provided in the slide groove, and the guide rod passes through the slider and slides with the slider, and a second spring is fixedly provided between the slider and the end surface of the slide groove.

7. The bellows with high airtightness according to claim 1, characterized in that: Two clamping rings are fixedly installed on the inner wall of the collar, and an annular clamping groove is opened on the outer circumference of the connecting pipe and the threaded pipe. The cross-sections of the clamping groove and the clamping ring are both set to T shape, and the clamping ring is rotatably set in the clamping groove.

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