Low-temperature joint structure and testing device thereof
The low-temperature fitting structure with a screw thread and extension slot design, along with a sealing blind plate and clamping screw, addresses frost formation and welding complexities in low-temperature equipment connections, enabling efficient testing and reusable components for mass production.
Patent Information
- Application Number
- CN202422364841.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-26
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-09-26
AI Technical Summary
The joints of existing low-temperature equipment need to be welded and sealed during the test and leak detection, which is complicated to operate and difficult to clean, and the dust and debris contaminants generated during the welding process are difficult to remove.
The low-temperature joint structure and its testing device are used, fixed by threaded connections and slots, sealed with plugs and seal blind plates, avoid welding, and sealing with caliper bolts to fix the seal ring to simplify the test and leak detection process.
It realizes that low-temperature joints do not need welding during testing and leak detection, saving time, and plugs and sealed blind plates can be reused for easy mass production and cleaning.
Smart Images
Figure CN223105543U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of cryogenic equipment, in particular to a cryogenic joint structure and a testing device thereof. Background Art
[0002] In cryogenic equipment, due to the low temperature of the medium, if general joints such as flanges or threaded connections are used, frosting will occur at the interfaces, resulting in a large loss of cold energy. Currently, cold insulation materials are wrapped around the joints, but it is not conducive to later disassembly, and the cold insulation materials need to be damaged during later disassembly.
[0003] In the prior art, Bayonet joints are used as joints for connecting equipment to external pipelines. This kind of joint can be conveniently disassembled and does not require wrapping of thermal insulation materials. The existing Bayonet joints are divided into male head components and female head components. The male head components are welded to the transmission pipelines, and the female head components are installed on the equipment. After the Bayonet joints are manufactured, pressure resistance tests and leak detection are required. Common leak detection and pressure resistance test methods are to block both ends by welding blind plates, and then connect to the test device or leak detection device. Since welding is a special process, it requires specialized personnel to operate, which is relatively troublesome. At the same time, after the test leak detection is completed and the blockage is removed by cutting, the joint also needs to be cleaned to remove pollutants such as dust and debris generated during the cutting process. Content of the Utility Model
[0004] In order to solve the problem that welding is required during test leak detection of existing joints, the utility model proposes a cryogenic joint structure and a testing device thereof.
[0005] The utility model is realized through the following technical solutions:
[0006] The utility model proposes that the cryogenic joint structure includes a joint body, wherein:
[0007] Threads are provided on the outer wall of the bottom of the joint body, a first extension part is provided at the top of the joint body, a clamping groove is provided on the bottom surface of the first extension part, and a sealing groove is provided on the top surface of the first extension part.
[0008] Further, a testing device for a cryogenic joint structure is characterized by comprising a plug, a fixing device, and a sealing blind plate, wherein:
[0009] Threads are provided on the inner wall of the plug, an interface pipe is provided on the sealing blind plate, the plug is hermetically fitted with the bottom of the joint body through the threads, the sealing blind plate is arranged on the top of the joint body, a second extension part is provided on the side of the sealing blind plate, a clamping groove is provided at the top of the second extension part, the sealing blind plate fits the top surface of the joint body, and the fixing device presses the sealing blind plate and the top of the joint body from the upper and lower sides through the clamping groove and seals them.
[0010] Further, a sealing gasket is provided between the plug and the bottom of the joint body. The plug and the joint body are connected by threads and the sealing gasket is compressed for sealing.
[0011] Further, a sealing ring is provided in the sealing groove of the joint body. The fixing device fixes the joint body and the sealing blind plate and compresses the sealing ring.
[0012] Further, the fixing device is a caliper bolt.
[0013] Advantages of the present utility model:
[0014] The low-temperature joint structure and the testing device thereof proposed by the present utility model can be sealed in cooperation with the plug and the sealing blind plate during the pressure test and leak detection. After the test, the plug and the sealing blind plate can be directly disassembled without welding, saving time. At the same time, the plug and the sealing blind plate can be reused, facilitating mass production. Description of the Drawings
[0015] Figure 1 is the overall structure diagram of the low-temperature joint structure and the testing device of the present utility model;
[0016] Figure 2 is Figure 1 the partial enlarged view of A of
[0017] Figure 3 is Figure 1 the partial enlarged view of B of
[0018] Figure 4 is the structure diagram of the low-temperature jacket pipe;
[0019] Figure 5 is the schematic diagram when the testing device of the present utility model tests the low-temperature jacket pipe;
[0020] Figure 6 is the schematic diagram of the principle of testing and leak detection of the low-temperature joint in the prior art;
[0021] In the figure: caliper bolt 1, joint body 2, sealing blind plate 3, sealing ring 4, sealing groove 5, clamping groove 6, plug 7;
[0022] The realization, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Detailed Embodiments
[0023] In order to more clearly and completely illustrate the technical solution of the present utility model, the present utility model will be further described below with reference to the accompanying drawings.
[0024] Please refer toFigures 1 - 6 , the present utility model proposes a low-temperature joint structure including a joint body 2, wherein:
[0025] The outer wall at the bottom of the joint body 2 is provided with threads, the top of the joint body 2 is provided with a first extension portion, a clamping groove 6 is provided on the bottom surface of the first extension portion, and a sealing groove 5 is provided on the top surface of the first extension portion.
[0026] In the specific implementation manner, the outer wall at the bottom of the joint body 2 is provided with threads, and the threads can cooperate with a plug 7 to achieve the sealing on one side of the joint body 2. The first extension portion at the top of the joint body 2 can facilitate the connection of the blind plate. The sealing groove 5 at the top of the first extension portion can place a sealing ring 4 to improve the sealing, and the clamping groove 6 at the bottom can facilitate the connection of the blind plate. Through the threads and the clamping groove 6, during the pressure test and leak detection, the plug 7 and the sealing blind plate 3 can be cooperated for sealing. After the test, the plug 7 and the sealing blind plate 3 can be directly disassembled without welding, saving time. At the same time, the plug 7 and the sealing blind plate 3 can be reused, which is convenient for mass production.
[0027] Furthermore, a test device for a low-temperature joint structure includes a plug 7, a fixing device, and a sealing blind plate 3, wherein:
[0028] The inner wall of the plug 7 is provided with threads, an interface pipe is provided on the sealing blind plate 3, the plug 7 is hermetically sealed with the bottom of the joint body 2 through the threads, the sealing blind plate 3 is arranged on the top of the joint body 2, a second extension portion is provided on the side of the sealing blind plate 3, a clamping groove 6 is provided on the top of the second extension portion, the sealing blind plate 3 fits the top surface of the joint body 2, and the fixing device presses and seals the sealing blind plate 3 and the top of the joint body 2 from the upper and lower sides through the clamping groove 6;
[0029] Furthermore, a sealing gasket is further arranged between the plug 7 and the bottom of the joint body 2, and the plug 7 and the joint body 2 are connected by threads and press the sealing gasket for sealing;
[0030] Furthermore, a sealing ring 4 is arranged in the sealing groove 5 of the joint body 2, and the fixing device fixes and presses the joint body 2 and the sealing blind plate 3 to compress the sealing ring 4;
[0031] Furthermore, the fixing device is a caliper bolt 1.
[0032] In a specific embodiment, a sealing gasket is provided between the plug 7 and the bottom of the joint body 2. Subsequently, the plug 7 is screwed onto the joint body 2 to squeeze the sealing gasket for sealing. An O-ring 4 is placed in the sealing groove 5 on the first extension part at the top of the joint body 2. Then, the second extension part of the sealing blind plate 3 is aligned with the first extension part of the joint body 2. Finally, the joint body 2 and the sealing blind plate 3 are fixed by the caliper bolts 1 through the card slots 6, and the O-ring 4 is pressed tightly to complete the fixation of the entire testing device. When performing a pressure resistance test or leak detection, a positive pressure or negative pressure is applied through the interface pipe at the top of the sealing blind plate 3 to complete the test or detection.
[0033] In one embodiment, the present utility model can also detect a cryogenic jacket pipe. When detecting the cryogenic jacket pipe, card slots 6 and sealing grooves 5 need to be provided on the ring plate where the inner pipe and the outer pipe of the cryogenic jacket pipe are connected. An O-ring 4 is placed in the sealing groove 5. Then, the sealing blind plate 3 is aligned with the ring plate, and the caliper bolts 1 are used for fixation to press the O-ring 4 tightly to complete the sealing, so that the pressure resistance test and leak detection can be completed without welding.
[0034] Certainly, the present utility model can have many other embodiments. Based on this embodiment, other embodiments obtained by those of ordinary skill in the art without any creative work belong to the scope protected by the present utility model.
Claims
1. A low-temperature joint structure, characterized in that, It includes a joint body, wherein: Threads are provided on the outer wall of the bottom of the joint body. A first extension part is provided at the top of the joint body. A clamping groove is provided on the bottom surface of the first extension part, and a sealing groove is provided on the top surface of the first extension part.
2. A test device applied to the low-temperature joint structure described in claim 1, characterized in that, The test device includes a plug, a fixing device and a sealing blind plate, wherein: Threads are provided on the inner wall of the plug. An interface pipe is provided on the sealing blind plate. The plug is hermetically fitted with the bottom of the joint body through the threads. The sealing blind plate is arranged on the top of the joint body. A second extension part is provided on the side of the sealing blind plate. A clamping groove is provided at the top of the second extension part. The sealing blind plate fits the top surface of the joint body. The fixing device presses the sealing blind plate and the top of the joint body from the upper and lower sides through the clamping groove and seals them.
3. The low-temperature joint structure testing device according to claim 2, characterized in that, A sealing gasket is further provided between the plug and the bottom of the joint body. The plug and the joint body are connected by threads and press the sealing gasket to seal.
4. The low-temperature joint structure testing device according to claim 2, characterized in that A sealing ring is provided in the sealing groove of the joint body. The fixing device fixes the joint body and the sealing blind plate and presses the sealing ring.
5. A low-temperature joint structure testing device according to claim 2, characterized in that, The fixing device is a caliper bolt.