A double-layered reaction tube

Abstract

The utility model provides a kind of double-layer reaction tube, belong to reaction tube technical field.The technical problem of more troublesome inner tube replacement of existing double-layer reaction tube is solved.Its technical scheme is: a kind of double-layer reaction tube, including inner tube and outer tube, the inner tube is located in outer tube, the inner tube is detachable relative to outer tube, the inner tube one end is provided with thread snap ring, the thread snap ring is in close contact with inner tube end, the thread snap ring is connected with outer tube inner wall thread.The utility model has the beneficial effect that: when installing inner tube, inner tube is inserted into outer tube, thread snap ring is screwed into outer tube from one end of outer tube, thread snap ring is in close contact with inner tube, the other end of inner tube is on outer tube inner wall, so as to realize inner tube installation;When replacing inner tube, unscrew thread snap ring, remove inner tube and insert new inner tube, re-screw thread snap ring, improve the convenience of inner tube replacement.

Description

Technical Field

[0001] This utility model relates to the field of reaction tube technology, and in particular to a double-layer reaction tube. Background Technology

[0002] A double-walled reaction tube is a tool used in chemical experiments or chemical reaction research to provide a reaction site for substances to undergo chemical reactions. It typically consists of an inner tube made of quartz and an outer tube made of stainless steel. The inner tube possesses excellent chemical stability and high-temperature resistance. It interacts almost entirely with common catalytic reactants, products, or catalysts. The outer tube, acting as an external pressure-bearing layer and structural support, provides the system with the necessary high-pressure withstand capability, giving the entire reactor structural integrity and operational safety under harsh high-temperature and high-pressure conditions.

[0003] In existing double-layer reaction tubes, the inner tube is usually fixed inside the outer tube and is sealed by multiple threaded points. When the inner tube needs to be replaced, the nuts at each threaded point must be opened one by one. After the inner tube is replaced, all the nuts must be tightened back one by one, making the replacement of the inner tube quite cumbersome. Summary of the Invention

[0004] The purpose of this invention is to provide a double-layer reaction tube that facilitates the replacement of the inner tube.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a double-layer reaction tube, comprising an inner tube and an outer tube, wherein the inner tube is located inside the outer tube and is detachable from the outer tube; a threaded retaining ring is provided at one end of the inner tube, the threaded retaining ring abuts against the end of the inner tube, and the threaded retaining ring is threadedly connected to the inner wall of the outer tube.

[0006] Furthermore, a sealing gasket is provided at the end of the inner tube away from the threaded retaining ring. The gasket is annular and located between the inner wall of the inner tube end and the inner wall of the outer tube end to seal the gap between the inner tube end wall and the inner wall of the outer tube end.

[0007] Furthermore, an annular groove is provided on the side of the gasket near the inner tube, and the end of the inner tube away from the threaded retainer is inserted into the annular groove; the annular groove can increase the contact area between the gasket and the end wall of the inner tube, thereby improving the sealing performance of the inner tube; at the same time, the annular groove can restrict the position of the inner tube, forming a gap between the outer wall of the inner tube and the inner wall of the outer tube to avoid direct contact. When the outer tube is subjected to accidental impact, the gap between the inner tube and the outer tube can buffer the impact and prevent the inner tube from breaking.

[0008] Furthermore, the outer wall of the gasket is attached to the inner wall of the outer tube, and the annular groove is coaxially arranged with the gasket, so that the gasket and the outer tube are coaxial. When the end of the inner tube is inserted into the annular groove, the inner tube and the outer tube are coaxial, so that the distance between the outer wall of the inner tube and the inner wall of the outer tube is uniform.

[0009] Furthermore, the annular groove contains a graphite sheet, which abuts against the end of the inner tube to improve sealing. The graphite sheet can further improve the sealing performance.

[0010] Furthermore, a positioning groove is provided on one side of the threaded retainer, and the end of the inner tube is inserted into the positioning groove; when the threaded retainer is rotated and tightened, the end of the inner tube away from the gasket is inserted into the positioning groove, and the inner tube will not tilt or misalign under the rotation of the threaded retainer.

[0011] Furthermore, a step is provided on the side of the gasket near the inner tube, and the end of the inner tube away from the threaded retainer is fitted onto the step.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] 1. When installing the inner tube, insert the inner tube into the outer tube, screw the threaded retainer into the outer tube from one end, and press the retainer against the inner tube. The other end of the inner tube rests against the inner wall of the outer tube, thus completing the installation of the inner tube. When replacing the inner tube, unscrew the threaded retainer, remove the inner tube, insert the new inner tube, and screw the threaded retainer back on. This improves the convenience of inner tube replacement.

[0014] 2. The annular groove can increase the contact area between the gasket and the inner tube end wall, improving the sealing performance of the inner tube; at the same time, the annular groove can restrict the position of the inner tube, forming a gap between the outer wall of the inner tube and the inner wall of the outer tube to avoid direct contact. When the outer tube is subjected to accidental impact, the gap between the inner tube and the outer tube can buffer the impact and prevent the inner tube from breaking. Attached Figure Description

[0015] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0016] Figure 1 This is a schematic diagram of a double-layer reaction tube in Embodiment 1 of this utility model.

[0017] Figure 2 This is a cross-sectional schematic diagram of a double-layer reaction tube in Embodiment 1 of this utility model.

[0018] Figure 3 This is a schematic diagram of the gasket structure in Embodiment 1 of this utility model.

[0019] Figure 4 This is a schematic diagram of the gasket structure in Embodiment 2 of this utility model.

[0020] The attached figures are labeled as follows: 1. Outer tube; 2. Inner tube; 3. Threaded retaining ring; 31. Positioning groove; 4. Gasket; 41. Annular groove; 42. Graphite sheet; 43. Step. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Of course, the specific embodiments described herein are only for explaining this utility model and are not intended to limit it.

[0022] Example 1

[0023] See Figure 1-3 The present invention provides a technical solution as follows: a double-layer reaction tube, including an inner tube 2 and an outer tube 1. The inner tube 2 is made of quartz, and the outer tube 1 is made of 316 stainless steel. The two ends of the outer tube 1 are provided with external threads for connecting the upper and lower gas passages.

[0024] Preferably, the inner tube 2 is inserted into the outer tube 1. A threaded retainer 3 is provided at one end of the outer tube 1. The outer wall of the threaded retainer 3 is threadedly connected to the inner wall of the outer tube 1 at that end. A positioning groove 31 is provided on the side wall of the threaded retainer 3. The end of the inner tube 2 near the threaded retainer 3 is inserted into the positioning groove 31. A gasket 4 is provided at the end of the inner tube 2 away from the threaded retainer 3. The gasket 4 is annular. An annular groove 41 is provided on the side wall of the gasket 4. The end of the inner tube 2 near the gasket 4 is inserted into the annular groove 41. A graphite sheet 42 is provided in the annular groove 41. The end of the inner tube 2 near the gasket 4 is pressed against the graphite sheet 42.

[0025] Preferably, the outer wall of the gasket 4 is in contact with the inner wall of the inner tube 2, and the annular groove 41, the gasket 4, the inner tube 2 and the outer tube 1 are all coaxially arranged. The side of the gasket 4 without the annular groove 41 is pressed against the inner wall of the end of the outer tube 1.

[0026] When the inner tube 2 needs to be replaced, unscrew and remove the threaded retaining ring 3, take out the inner tube 2, insert the new inner tube 2, align one end of the new inner tube 2 with the annular groove 41 of the gasket 4 and insert it, then screw the threaded retaining ring 3 back into the outer tube 1, and when screwing the threaded retaining ring 3, insert the other end of the new inner tube 2 into the positioning groove 31 until the threaded retaining ring 3 is tightened. At this time, both ends of the inner tube 2 are respectively pressed against the graphite sheet 42 in the annular groove 41 and the bottom wall of the positioning groove 31, and the replacement of the inner tube 2 can be completed, which is convenient and quick.

[0027] Example 2

[0028] The difference from Embodiment 1 is that a step 43 is provided on the side wall of the gasket 4 near the inner tube 2, the graphite sheet 42 is fitted on the step 43, the step 43 is inserted into the opening of the inner tube 2 near the end of the gasket 4, and the two sides of the graphite sheet 42 are respectively attached to the step 43 and the inner wall of the inner tube 2 to achieve a seal.

[0029] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A double-layer reaction tube, comprising an inner tube (2) and an outer tube (1), wherein the inner tube (2) is located inside the outer tube (1), characterized in that, The inner tube (2) is detachable from the outer tube (1). One end of the inner tube (2) is provided with a threaded retainer (3). The threaded retainer (3) abuts against the end of the inner tube (2). The threaded retainer (3) is threadedly connected to the inner wall of the outer tube (1).

2. The double-layer reaction tube according to claim 1, characterized in that, A gasket (4) for sealing is provided at the end of the inner tube (2) away from the threaded retainer (3).

3. The double-layer reaction tube according to claim 2, characterized in that, The gasket (4) has an annular groove (41) on the side near the inner tube (2), and the end of the inner tube (2) away from the threaded retainer (3) is inserted into the annular groove (41).

4. The double-layer reaction tube according to claim 3, characterized in that, The outer wall of the gasket (4) is attached to the inner wall of the outer tube (1).

5. The double-layer reaction tube according to claim 3, characterized in that, The annular groove (41) contains a graphite sheet (42), which abuts against the end of the inner tube (2) to improve sealing.

6. The double-layer reaction tube according to claim 1, characterized in that, The threaded retainer (3) has a positioning groove (31) on one side, and the end of the inner tube (2) is inserted into the positioning groove (31).

7. The double-layer reaction tube according to claim 2, characterized in that, The gasket (4) has a step (43) on the side near the inner tube (2), and the end of the inner tube (2) away from the threaded retainer (3) is fitted onto the step (43).

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