A vacuum-resistant polytetrafluoroethylene straight tube

Abstract

The utility model provides a vacuum-resistant polytetrafluoroethylene straight tube, which relates to the technical field of straight tubes, and includes a first outer tube and a second outer tube, wherein the right surface of the first outer tube is fixedly connected with a first flange, and the right end surface of the first flange is fixedly and symmetrically connected with a positioning block. In the utility model, the first flange and the second flange are preliminarily fixedly installed by using a positioning block, a positioning groove, a spring, a telescopic rod, an installation groove and a limit block, so that the threaded holes of the first flange and the second flange are aligned, and then they are fixed by bolts and nuts, so as to improve the convenience and stability of the straight tube during connection, and the first rubber pad, the second rubber pad, the plug block, the slot, the rubber strip and the fixing groove are used in combination to fill the gap between the first inner tube and the second inner tube after installation, so as to ensure the sealing of the first inner tube and the second inner tube after installation, thereby enhancing the vacuum resistance of the straight tube.

Description

Technical Field

[0001] The utility model relates to the technical field of straight pipes, in particular to a vacuum-resistant polytetrafluoroethylene straight pipe. Background Art

[0002] Polytetrafluoroethylene has good chemical stability, corrosion resistance, sealing, high lubricity and non-stickiness, electrical insulation and good anti-aging resistance. It is mainly used as an engineering plastic. Due to its good comprehensive properties, it can be used as a raw material for pipes, and then the corresponding polytetrafluoroethylene pipes are derived.

[0003] In the prior art, for example, Chinese patent CN216009836U discloses a vacuum-resistant polytetrafluoroethylene tube, comprising a first outer steel tube, a second outer steel tube installed at one end of the first outer steel tube, a polytetrafluoroethylene inner tube is provided on the inner walls of the first outer steel tube and the second outer steel tube, sealing rings are installed on the inner walls of the first outer steel tube and the second outer steel tube on both sides of the polytetrafluoroethylene inner tube, a vacuum tube is provided at the center position of the top of the first outer steel tube and the second outer steel tube, the bottom end of the vacuum tube extends to the inside of the first outer steel tube and the second outer steel tube, a sealing plug is installed on the top of the vacuum tube, a second flange is fixed on the outer wall of one side of the first outer steel tube, and a first flange is fixed on the outer wall of one side of the second outer steel tube. The utility model not only avoids the phenomenon that the polytetrafluoroethylene inner tube is located on the inner wall of the first outer steel tube and the second outer steel tube and produces slippage, improves the convenience of the polytetrafluoroethylene tube when used, but also achieves the purpose of dust prevention.

[0004] In the above patent, although the phenomenon of the polytetrafluoroethylene inner tube slipping on the inner walls of the first outer steel tube and the second outer steel tube is avoided, when installing through the flange, it is necessary to manually align the bolt connection holes of the two flanges slowly, and relative movement is likely to occur between the flanges during alignment, resulting in difficulty in alignment, making it inconvenient to connect the two pipes. Utility Model Content

[0005] The purpose of the utility model is to solve the problem in the above patent that although the slippage of the polytetrafluoroethylene inner tube on the inner walls of the first outer steel tube and the second outer steel tube is avoided, when installing through the flange, it is necessary to manually align the bolt connection holes of the two flanges slowly, and relative movement is likely to occur between the flanges during alignment, resulting in difficulty in alignment and making it inconvenient to connect the two pipes. A vacuum-resistant polytetrafluoroethylene straight tube is proposed.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a vacuum-resistant polytetrafluoroethylene straight tube, comprising a first outer tube and a second outer tube, the right surface of the first outer tube is fixedly connected with a first flange, the right end surface of the first flange is fixedly and symmetrically connected with a positioning block, the outer surfaces of the two positioning blocks are provided with mounting grooves, the inner surfaces of the two mounting grooves are fixedly connected with telescopic rods, one ends of the two telescopic rods are fixedly connected with limiting blocks, the outer surfaces of the two telescopic rods are sleeved with springs, the left end surface of the second outer tube is fixedly connected with a second flange, the left end surface of the second flange is symmetrically provided with positioning grooves, the inner wall of the first outer tube is fixedly connected with the first inner tube, and the inner wall of the second flange is fixedly connected with the second inner tube.

[0007] Preferably, the right end surface of the first inner tube is fixedly connected with an insert block, and the right end surface of the insert block is fixedly connected with a first rubber pad.

[0008] Preferably, a second rubber pad is fixedly connected to the right end surface of the first inner tube at the edge, and a slot is provided on the left end surface of the second inner tube.

[0009] Preferably, the outer surface of the insert block is matched with the inner surface of the slot, and the slot is matched with the first rubber pad.

[0010] Preferably, a fixing groove is provided on the outer surface of the insert block, and a rubber ring is provided on the inner surface of the fixing groove.

[0011] Preferably, the outer surfaces of the two positioning blocks are slidably arranged with the inner surfaces of the two positioning grooves, and the two limit blocks are snap-fitted with the second flange.

[0012] Preferably, outer surfaces of the two limit blocks are slidably arranged with inner surfaces of the two mounting grooves respectively, and cross sections of the two limit blocks are inclined.

[0013] Compared with the prior art, the advantages and positive effects of the utility model are:

[0014] 1. In the utility model, the first flange and the second flange are preliminarily fixed and installed by using a positioning block, a positioning groove, a spring, a telescopic rod, a mounting groove and a limit block, so that the threaded holes of the first flange and the second flange are aligned, and then they are fixed by bolts and nuts, thereby improving the convenience and stability of the straight pipe during connection. The first rubber pad, the second rubber pad, the insert block, the slot, the rubber strip and the fixing groove are used together to fill the gap between the first inner tube and the second inner tube after installation, thereby ensuring the sealing of the first inner tube and the second inner tube after installation, thereby enhancing the vacuum resistance of the straight tube.

[0015] 2. In the utility model, the cross-sections of the two limit blocks are inclined so that the limit blocks can be moved to the inside of the installation groove more conveniently, making the first flange and the second flange more convenient to install, and with the assistance of the telescopic rod, the moving direction of the limit blocks can be limited, which has high practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A three-dimensional diagram of a vacuum-resistant polytetrafluoroethylene straight tube is proposed for the utility model;

[0017] Figure 2 The utility model proposes an expanded diagram of a vacuum-resistant polytetrafluoroethylene straight tube;

[0018] Figure 3 The utility model proposes a partial structural explosion diagram of a vacuum-resistant polytetrafluoroethylene straight tube;

[0019] Figure 4 The utility model provides a partial structural development diagram of a vacuum-resistant polytetrafluoroethylene straight tube;

[0020] Figure 5 A cross-sectional view of a vacuum-resistant polytetrafluoroethylene straight tube is provided for the utility model;

[0021] Figure 6 for Figure 5 Enlarged view of point A in the middle.

[0022] Legend: 1. First outer tube; 2. Positioning block; 3. Second outer tube; 4. First flange; 5. Second flange; 6. Limit block; 7. Positioning slot; 8. Spring; 9. Telescopic rod; 10. Mounting slot; 11. First inner tube; 12. Second inner tube; 13. First rubber pad; 14. Rubber ring; 15. Second rubber pad; 16. Slot; 17. Fixing slot; 18. Insert block. DETAILED DESCRIPTION

[0023] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0024] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0025] Embodiment 1, as Figure 1-Figure 4As shown, the utility model provides a vacuum-resistant polytetrafluoroethylene straight tube, including a first outer tube 1 and a second outer tube 3, the right surface of the first outer tube 1 is fixedly connected with a first flange 4, the right end surface of the first flange 4 is fixedly and symmetrically fixedly connected with a positioning block 2, the outer surfaces of the two positioning blocks 2 are both provided with mounting grooves 10, one end of two telescopic rods 9 are both fixedly connected with a limiting block 6, the outer surfaces of the two telescopic rods 9 are both sleeved with a spring 8, the left end surface of the second outer tube 3 is fixedly connected with a second flange 5, the left end surface of the second flange 5 is symmetrically provided with positioning grooves 7, the inner wall of the first outer tube 1 is fixedly connected with a first inner tube 11, and the inner wall of the second flange 5 is fixedly connected with a second inner Tube 12, the right end face of the first inner tube 11 is fixedly connected with an insert block 18, the right end face of the insert block 18 is fixedly connected with a first rubber pad 13, the right end face of the first inner tube 11 is fixedly connected with a second rubber pad 15 at the edge, a slot 16 is provided on the left end face of the second inner tube 12, the outer surface of the insert block 18 is matched with the inner surface of the slot 16, the slot 16 is matched with the first rubber pad 13, a fixing groove 17 is provided on the outer surface of the insert block 18, and a rubber ring 14 is provided on the inner surface of the fixing groove 17, the outer surfaces of the two positioning blocks 2 are slidably arranged with the inner surfaces of the two positioning grooves 7, and the two limit blocks 6 are snap-fitted with the second flange 5.

[0026] The effect achieved by the entire embodiment 1 is that both the first inner tube 11 and the second inner tube 12 are polytetrafluoroethylene straight tubes. When the two pipes need to be installed, after picking up the first outer tube 1, align the two positioning blocks 2 on the first flange 4 with the two positioning grooves 7 on the second flange 5, and then push the first outer tube 1 to the right to insert the positioning blocks 2 into the positioning grooves 7. During the insertion, the limit blocks 6 will be squeezed by the positioning grooves 7, which will drive the limit blocks 6 to move toward the installation groove 10 and drive the spring 8 and the telescopic rod 9 to be compressed. When the second flange 5 is completely fitted with the first flange 4, the first outer tube 1 and the second outer tube 3 are fitted, and at the same time, the insert block 18 on the first inner tube 11 is inserted into the slot 16 on the second inner tube 12. At this time, the limit blocks 6 are no longer subjected to the extrusion force, so that under the action of the rebound restoring force of the spring 8, the limit blocks 6 are The limit block 6 is pushed out from the installation groove 10 to complete the preliminary fixation of the first flange 4 and the second flange 5, ensuring that the threaded holes of the first flange 4 and the second flange 5 are aligned, and then they are fixed by bolts and nuts, so that the first outer tube 1, the first inner tube 11 and the second outer tube 3 and the second inner tube 12 are docked and installed. At the same time, after the installation is completed, the first rubber pad 13 will be squeezed between the plug block 18 and the slot 16 to produce deformation to fill the gap, and the second rubber pad 15 will be squeezed by the first inner tube 11 and the second inner tube 12 to produce deformation to fill the gap, and with the cooperation of the rubber ring 14 and the fixing groove 17, the gap between the plug block 18 and the slot 16 can be further filled to ensure the sealing of the first inner tube 11 and the second inner tube 12 after installation, thereby enhancing the vacuum resistance of the straight tube.

[0027] Embodiment 2, as Figure 1-Figure 4 As shown, the outer surfaces of the two limit blocks 6 are slidably arranged with the inner surfaces of the two installation grooves 10 respectively, the cross-sections of the two limit blocks 6 are inclined, and the inner surfaces of the two installation grooves 10 are fixedly connected with telescopic rods 9.

[0028] The effect achieved by the entire embodiment 2 is that, through the inclined cross-section setting of the two limit blocks 6, the limit blocks 6 can be more conveniently moved to the inside of the installation groove 10, making the first flange 4 and the second flange 5 more convenient to install, and with the assistance of the telescopic rod 9, the moving direction of the limit blocks 6 can be limited.

[0029] Working principle: when it is necessary to install two pipes, pick up the first outer tube 1, align the two positioning blocks 2 on the first flange 4 with the two positioning grooves 7 on the second flange 5, and then push the first outer tube 1 to the right to insert the positioning block 2 into the positioning groove 7. During insertion, the limiting block 6 will be squeezed by the positioning groove 7 through the inclined cross-section setting of the limiting block 6, which will drive the limiting block 6 to move toward the installation groove 10 and drive the spring 8 and the telescopic rod 9 to be compressed. When the second flange 5 is completely fitted with the first flange 4, the first outer tube 1 and the second outer tube 3 are fitted, and at the same time, the insert block 18 on the first inner tube 11 is inserted into the slot 16 on the second inner tube 12. At this time, the limiting block 6 is no longer subjected to the extrusion force, so that under the action of the rebound restoring force of the spring 8 and with the assistance of the telescopic rod 9, the moving direction of the limiting block 6 can be limited, so that the limiting block 6 is pushed out from the installation groove 10, so that the limit block 6 is engaged with the second flange 5, and the first flange 4 and the second flange 5 are initially fixed, ensuring that the threaded holes of the first flange 4 and the second flange 5 are aligned, and then they are fixed by bolts and nuts, so that the first outer tube 1, the first inner tube 11 and the second outer tube 3 and the second inner tube 12 are docked and installed. At the same time, after the installation is completed, the first rubber pad 13 will be squeezed between the plug block 18 and the slot 16 to deform and fill the gap, and the second rubber pad 15 will be squeezed by the first inner tube 11 and the second inner tube 12 to deform and fill the gap, and with the cooperation of the rubber ring 14 and the fixing groove 17, the gap between the plug block 18 and the slot 16 can be further filled, ensuring the sealing of the first inner tube 11 and the second inner tube 12 after installation, thereby enhancing the vacuum resistance of the straight tube.

[0030] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A vacuum-resistant polytetrafluoroethylene straight tube, comprising a first outer tube (1) and a second outer tube (3), characterized in that: The first outer tube (1) is fixedly connected to the right surface with a first flange (4), the right end surface of the first flange (4) is symmetrically fixedly connected to a positioning block (2), the outer surfaces of the two positioning blocks (2) are provided with mounting grooves (10), the inner surfaces of the two mounting grooves (10) are fixedly connected to telescopic rods (9), one end of the two telescopic rods (9) is fixedly connected to a limiting block (6), the outer surfaces of the two telescopic rods (9) are sleeved with springs (8), the left end surface of the second outer tube (3) is fixedly connected to a second flange (5), the left end surface of the second flange (5) is symmetrically provided with positioning grooves (7), the inner wall of the first outer tube (1) is fixedly connected to a first inner tube (11), and the inner wall of the second flange (5) is fixedly connected to a second inner tube (12).

2. The vacuum-resistant polytetrafluoroethylene straight tube according to claim 1, characterized in that: The right end surface of the first inner tube (11) is fixedly connected to an insert block (18), and the right end surface of the insert block (18) is fixedly connected to a first rubber pad (13).

3. The vacuum-resistant polytetrafluoroethylene straight tube according to claim 2, characterized in that: A second rubber pad (15) is fixedly connected to the right end surface of the first inner tube (11) at the edge, and a slot (16) is provided on the left end surface of the second inner tube (12).

4. The vacuum-resistant polytetrafluoroethylene straight tube according to claim 3, characterized in that: The outer surface of the insert block (18) is matched with the inner surface of the slot (16), and the slot (16) is matched with the first rubber pad (13).

5. The vacuum-resistant polytetrafluoroethylene straight tube according to claim 4, characterized in that: The outer surface of the insert block (18) is provided with a fixing groove (17), and the inner surface of the fixing groove (17) is provided with a rubber ring (14).

6. The vacuum-resistant polytetrafluoroethylene straight tube according to claim 5, characterized in that: The outer surfaces of the two positioning blocks (2) are slidably arranged with the inner surfaces of the two positioning grooves (7), and the two limit blocks (6) are snap-fitted with the second flange (5).

7. The vacuum-resistant polytetrafluoroethylene straight tube according to claim 6, characterized in that: The outer surfaces of the two limit blocks (6) are respectively slidably arranged with the inner surfaces of the two installation grooves (10), and the cross sections of the two limit blocks (6) are both inclined.

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