A corrugated pipe vacuum negative pressure test fixture

Abstract

The utility model discloses a corrugated pipe vacuum negative pressure test fixture, include: limit seat, this limit seat is by two groups of symmetrical half -enclosing limit shell and is closed, and the inside of limit seat is formed with the limit chamber for realizing corrugated pipe loading, and still be provided with the detection mouth with limit chamber intercommunication on both sides of limit seat, still be provided with the connecting pressure piece on the upper and lower ends of limit seat, and the two groups of limit seat buckle closing are realized through this connecting pressure piece, and the corrugated pipe end is pressed tightly simultaneously, the fixture is through limit seat two groups of symmetrical half -enclosing limit shell buckle closing and inside limit chamber accurate adaptation corrugated unit structure, and the cooperation connection pressure piece end cap recess and corrugated unit end portion are closely embedded, realize stable loading positioning, and effectively avoid the detection error.

Description

Technical Field

[0001] This utility model belongs to the field of corrugated pipe technology and relates to a corrugated pipe vacuum negative pressure testing fixture. Background Technology

[0002] Bellows, as an elastic element with axial expansion and contraction capabilities, are widely used in chemical, energy, and electronics industries, often undertaking important functions such as fluid transportation, sealing and isolation, and energy conversion. In operating conditions involving gaseous or liquid media, their sealing performance directly affects equipment operational safety; even minor leaks can lead to serious safety hazards or equipment failure. A bellows is composed of multiple bellows units, each formed by welding an anode bellows plate and a cathode bellows plate. The sealing quality at the welding point is crucial to the reliability of the bellows unit. However, current technology lacks dedicated and efficient tools and stable processing fixtures for airtightness testing of the inner ring welds of bellows units, resulting in poor testing stability. Traditional general-purpose sealing testing equipment is difficult to adapt to the special structure of bellows units, leading to problems such as incomplete sealing and insufficient testing accuracy, resulting in a high false judgment rate and failing to meet the high-quality testing requirements of bellows units in production. Utility Model Content

[0003] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A bellows vacuum negative pressure testing fixture includes: a limiting seat, which is formed by two sets of symmetrically arranged semi-enclosed limiting shells fastened together, and the limiting seat has a limiting cavity formed inside for loading the bellows; and the limiting seat also has detection ports on both sides that communicate with the limiting cavity. The upper and lower ends of the limiting seat are also provided with connecting pressure blocks, which are used to fasten and fix the two sets of limiting seats together, while pressing the end of the bellows.

[0004] As a further embodiment of this utility model: a plurality of screw holes are formed on the end face of the limiting shell; The connecting pressure block has a complex array of screw through holes that correspond to the screw holes on the two side limit shells.

[0005] As a further embodiment of this utility model: the connecting pressure block is formed with a complex array of connecting studs corresponding to the screw holes on the two side limiting shells, and the screw through holes are provided on the connecting studs; The screw hole of the limiting shell is also provided with a positioning hole for the insertion of the connecting stud.

[0006] As a further embodiment of this utility model: the lower end face of the connecting block is formed with an end cap groove corresponding to the shape of the bellows end cap.

[0007] As a further embodiment of this utility model: the upper and lower ends of the limiting seat narrow towards the center and fit tightly against the outer wall of the bellows to achieve radial limiting of the bellows; The top inner edge of the limiting seat is formed with an inwardly extending limiting ring edge, which can be embedded in the position between the corrugated sheets of the bellows.

[0008] The beneficial effects of this utility model are as follows: This fixture achieves stable loading and positioning by using two sets of symmetrical semi-enclosed limiting shells of the limiting seat to precisely fit the corrugated unit structure through the internal limiting cavity. Combined with the end cap groove of the connecting pressure block tightly fitting the end of the corrugated unit, it effectively avoids detection errors and can accurately identify welding sealing defects in the inner ring. Simultaneously, the connecting pressure block, by fastening the limiting seat to press the end of the corrugated unit, combined with the sealing effect of the end cap groove, forms a stable sealing structure, ensuring a stable negative pressure environment within the limiting cavity and guaranteeing reliable test results. It enables convenient loading, positioning, and sealing operations, significantly shortening test preparation time, avoiding repeated testing, and significantly improving test efficiency. Furthermore, the precise positioning and sealing design reduces the false judgment rate, minimizes rework and product rejection, and its strong versatility allows it to adapt to various specifications, reducing equipment procurement and maintenance costs and effectively improving enterprise economic benefits. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of this utility model.

[0010] Figure 2 This is an exploded structural diagram of the present invention.

[0011] Figure 3 This is a cross-sectional view of the structure of this utility model. Detailed Implementation

[0012] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. It should be understood that this application is not limited to the exemplary embodiments disclosed herein. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0013] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0014] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0015] In the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0016] This utility model provides a reference. Figures 1-3 In this embodiment of the utility model, a corrugated pipe vacuum negative pressure testing fixture includes: a limiting seat 1, which is formed by two sets of symmetrically arranged semi-enclosed limiting shells 12 fastened together; the limiting seat 1 has a limiting cavity formed inside for loading the corrugated pipe A; and the limiting seat 1 also has detection ports 11 on both sides that communicate with the limiting cavity. The upper and lower ends of the limiting seat 1 are also provided with connecting pressure blocks 2. The connecting pressure blocks 2 are used to fasten and fix the two sets of limiting seats 1 together, and at the same time press the end of the bellows A to achieve axial limit of the bellows A. The limiting seat 1, except for the detection port 11, forms a relatively sealed structure to ensure that the detection environment is sealed. During the test, the detection port 11 is connected to a vacuum pump and a pressure sensor. Air is pumped to form a negative pressure in the limiting cavity. The pumping stops after the preset pressure is reached. If the bellows A is damaged, the pressure in the cavity will rise. If it exceeds the range, it will be judged as unqualified. If the pressure is stable, the test is passed.

[0017] Furthermore, a plurality of screw holes 14 are formed on the end face of the limiting shell 12; The connecting pressure block 2 has a plurality of screw through holes 23 corresponding to the screw holes 14 on the two side limit shells 12; the connecting pressure block 2 achieves a stable connection between the limit shells 12 by simultaneously engaging with the screws of the two sets of limit shells 12.

[0018] Furthermore, in order to improve the assembly accuracy and efficiency of the connecting studs 22, a complex array of connecting studs 22 corresponding to the screw holes 14 on the two side limit shells 12 are formed on the connecting pressure block 2, and screw through holes 23 are provided on the connecting studs 22. The screw hole 14 of the limiting shell 12 is also provided with a positioning hole 13 for the connecting stud 22 to be inserted; by the connection stud 22 and the positioning hole 13 being inserted and engaged, the connecting pressure block 2 and the limiting shell 12 can be quickly connected and engaged.

[0019] Furthermore, the lower end face of the connecting block 2 is formed with an end cap groove 21 corresponding to the shape of the end cap of the bellows A. When the connecting block 2 is installed on the limiting seat 1, the design of the end cap groove 21 enables the end cap of the bellows A to fit more tightly with the connecting block 2, thereby improving the sealing performance of the test.

[0020] Furthermore, the upper and lower ends of the limiting seat 1 narrow towards the center and fit tightly against the outer wall of the bellows A to achieve radial limiting of the bellows A; Furthermore, the top inner edge of the limiting seat 1 is formed with an inwardly extending limiting ring edge 16, which can be embedded in the position between the corrugated sheets of the bellows A; thus realizing the limiting function of the bellows A, and at the same time, it can cooperate with the corrugated sheets to form a sealed fit structure.

[0021] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0022] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A bellows vacuum negative pressure testing fixture, characterized in that, include: The limiting seat is formed by two sets of symmetrically arranged semi-enclosed limiting shells fastened together. The limiting seat has a limiting cavity formed inside for loading the bellows. The limiting seat also has detection ports on both sides that communicate with the limiting cavity. The upper and lower ends of the limiting seat are also provided with connecting pressure blocks, which are used to fasten and fix the two sets of limiting seats together, while pressing the end of the bellows.

2. The bellows vacuum negative pressure testing fixture according to claim 1, characterized in that, The end face of the limiting shell is formed with a plurality of screw holes; The connecting pressure block has a complex array of screw through holes that correspond to the screw holes on the two side limit shells.

3. The bellows vacuum negative pressure testing fixture according to claim 2, characterized in that, The connecting block is formed with a complex array of connecting studs that correspond to the screw holes on the two side limit shells, and the screw through holes are set on the connecting studs; The screw hole of the limiting shell is also provided with a positioning hole for the insertion of the connecting stud.

4. The bellows vacuum negative pressure testing fixture according to claim 1, characterized in that, The lower end face of the connecting block is formed with an end cap groove corresponding to the shape of the bellows end cap.

5. The bellows vacuum negative pressure testing fixture according to claim 1, characterized in that, The upper and lower ends of the limiting seat narrow towards the center and fit tightly against the outer wall of the bellows to achieve radial limiting of the bellows; The top inner edge of the limiting seat is formed with an inwardly extending limiting ring edge, which can be embedded in the position between the corrugated sheets of the bellows.

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