Multi-batch low-temperature test tool for pressure sensitive elements
By integrating pressure-sensitive elements with integrated air passages and mounting structures into a multi-batch low-temperature testing fixture, the problems of poor airtightness and low efficiency of existing fixtures are solved, achieving high-precision and high-efficiency batch testing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHENGDU CAIC ELECTRONICS CO LTD
- Filing Date
- 2025-06-26
- Publication Date
- 2026-05-19
AI Technical Summary
The existing pressure-sensitive element testing fixtures have poor airtightness, resulting in low accuracy of test data and low testing efficiency.
A multi-batch low-temperature testing fixture for pressure-sensitive elements was designed, integrating gas path channels and mounting structure. It adopts a single-step installation method, using limiting posts and hexagonal screws to fix the pressure-sensitive elements, ensuring airtightness. Multiple interfaces are set on the fixture body for batch testing.
It improves the reliability and accuracy of testing, enables simultaneous and efficient testing of multiple pressure-sensitive components, and enhances testing efficiency.
Smart Images
Figure CN224262701U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pressure-sensitive element testing technology, specifically to a multi-batch low-temperature testing fixture for pressure-sensitive elements. Background Technology
[0002] With the rapid development of heavy industries such as aviation, aerospace, and petrochemicals, the accuracy requirements for testing components have significantly increased. Pressure-sensitive components, in particular, are required to operate normally within a temperature range of up to 250°C and a pressure range exceeding 40 MPa, achieving a high measurement accuracy within ±0.1%FS. To ensure that pressure-sensitive components can withstand such complex and harsh working environments, they typically need to be mounted on specialized fixtures for simulation testing.
[0003] However, most existing test fixtures only provide air passage functionality, requiring connection to pressure-sensitive elements via adapters. This multi-stage connection method significantly compromises airtightness, compromising the accuracy of test data. Furthermore, existing fixtures generally suffer from a disproportionate size to the number of tests performed, impacting testing efficiency. Utility Model Content
[0004] The purpose of this invention is to provide a multi-batch low-temperature testing fixture for pressure-sensitive elements, in order to solve the problems of poor airtightness and low testing efficiency caused by insufficient fixture design in the prior art.
[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:
[0006] A multi-batch low-temperature testing fixture for pressure-sensitive elements includes a fixture body, a connector, a plug, hexagonal screws, a limiting plate, and a pressure plate. Two manifolds are arranged parallel to each other inside the fixture body, and a guide pipe is also provided perpendicular to the parallel manifolds. One end of the guide pipe passes through the manifold and connects to the other manifold, while the other end extends to the outside of the fixture body. The guide pipe, manifold, and the other manifold are connected, and all three pipes have threads at their openings. Installation slots are symmetrically and evenly spaced on both sides of the fixture body, with 10 slots on each side and a total of 20 slots on both sides. The surface of the fixture body is covered with a pressure plate.
[0007] Furthermore, plugs are fixedly installed at the three ports in the manifold and one port in the guide pipe.
[0008] Furthermore, the pipe openings in the manifold that are not plugged are fixedly equipped with connectors.
[0009] Furthermore, the tooling body has four limit post threaded holes evenly arranged along the center line. The limit posts engage with the tooling body through the limit post threaded holes, and the external thread of the limit post corresponds only to the internal thread of the limit post threaded hole.
[0010] Furthermore, the tooling body has five hexagonal screw threaded holes evenly arranged along the center line, which are staggered with the threaded holes of the limiting post. The hexagonal screws penetrate the pressure plate and engage with the hexagonal screw threaded holes for fixation, and the external threads of the hexagonal screws correspond only to the internal threads of the hexagonal screw threaded holes.
[0011] Furthermore, the pressure-sensitive element is disposed in the mounting groove, and the upper surface of the pressure-sensitive element is in contact with the pressure plate.
[0012] Furthermore, the bottom of the mounting groove is connected to the guide pipe.
[0013] This utility model has the following beneficial effects:
[0014] Improved testing reliability and accuracy: By integrating the air path and mounting structure into the fixture body, single-step installation of the air path and pressure-sensitive element is achieved, effectively avoiding airtightness issues caused by multi-stage connections, thus ensuring the accuracy and reliability of test data. Enables high-volume, high-efficiency testing: This fixture features one air inlet and twenty test connectors on the manifold, allowing simultaneous testing of multiple pressure-sensitive elements, significantly improving testing efficiency. Attached Figure Description
[0015] Figure 1 This is a top half-sectional view of the tooling body of this utility model;
[0016] Figure 2 This is a half-sectional side view of the present invention after the pressure plate is installed;
[0017] Figure 3 This is a sectional view of the mounting groove of this utility model;
[0018] Figure 4 This is a top view of the tooling body of this utility model;
[0019] Figure 5 This is a top view of the pressure plate of this utility model;
[0020] Figure 6 This is a top view of the tooling body in Embodiment 2 of this utility model.
[0021] Figures 1 to 6 The reference numerals in the attached drawings are respectively: 1-tool body, 2-connector nozzle, 3-plug, 4-hexagonal screw, 5-limiting post, 6-pressure plate, 7-manifold, 8-mounting groove, 9-guide tube, 11-limiting post threaded hole, 12-hexagonal screw threaded hole, 13-pressure sensitive element. Detailed Implementation
[0022] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0023] Example 1:
[0024] As attached Figures 1-2 As shown, a multi-batch cryogenic testing fixture for pressure-sensitive elements includes a fixture body 1, a connector 2, a plug 3, hexagonal screws 4, a pressure plate 6, and a limiting post 5 for setting the position of the pressure plate 6. The fixture body 1 is the basic structure of the entire fixture. Inside, two parallel manifolds 7 form the main gas passage. A guide pipe 9 is also provided, its direction perpendicular to the two parallel manifolds 7. One end of the guide pipe 9 passes through one manifold 7 and connects to the other manifold 7, thus integrating the three pipes (two manifolds 7 and one guide pipe 9) into a unified gas path system. All pipes have threads at their openings on the outside of the fixture body 1 for easy connection to other components.
[0025] The upper surface of the fixture body 1 is designed as a mounting plane for mounting the pressure-sensitive element 13 to be tested. Mounting slots 8 are symmetrically formed on this plane. Specifically, 10 mounting slots 8 are evenly spaced on each of the left and right sides of the fixture body 1, allowing a total of 20 pressure-sensitive elements 13 to be mounted on both sides, thus enabling batch testing.
[0026] In addition, as attached Figure 3 As shown, the bottom of each mounting slot 8 is connected to the internal guide pipe 9. This design allows the air pressure entering from the outside to be accurately and evenly transmitted to the pressure-sensitive element 13 at the bottom of each mounting slot 8 through the channel formed by the manifold 7 and the guide pipe 9, ensuring the consistency and accuracy of the test pressure.
[0027] To ensure the airtightness of the entire gas circuit system, unused pipe openings need to be sealed. Specifically, three of the four openings on the two manifolds 7, and one opening on the outside of the guide pipe 9, are all fitted with plugs 3 via threaded connections. To ensure absolute airtightness under high temperature and pressure, the plugs 3 are usually welded shut after installation. The remaining opening on the manifold 7 without a plug 3 is used to install a connector 2. This connector 2 serves as the sole inlet or outlet for the entire testing fixture and is also sealed and fixed via welding to connect to an external pressure source or vacuum pump.
[0028] As attached Figures 4-5As shown, in order to reliably fix the non-threaded pressure-sensitive element 13 in the mounting groove 8, this embodiment employs a pressure plate limiting and fastening mechanism. Specifically, four limiting post threaded holes 11 and five hexagonal screw threaded holes 12 are evenly arranged on the center line of the upper surface of the tooling body 1, and the two are staggered. During installation, firstly, the four limiting posts 5 are screwed into the corresponding limiting post threaded holes 11 through their external threads. The height of the limiting posts 5 is precisely designed to support the pressure plate 6 and ensure the levelness of the pressure plate 6 after installation. Subsequently, 20 pressure-sensitive elements 13 are placed in their respective mounting grooves 8. The pressure plate 6 is then placed on top, and the lower surface of the pressure plate 6 will fit against the upper surface of all the limiting posts 5. Finally, five hexagonal screws 4 are passed through the pre-drilled holes on the pressure plate 6 and screwed into the corresponding hexagonal screw threaded holes 12 of the tooling body 1. After tightening the hexagonal screws 4, the pressure plate 6, supported by the limiting post 5, applies pressure evenly downwards. Its lower surface fits tightly against the upper surface of each pressure-sensitive element 13, thus firmly pressing all elements into the mounting slots 8. This ensures that the elements will not loosen during testing and guarantees the seal between the pressure-sensing surface of the element and the air passage. To facilitate the connection of electrical or other parts of the pressure-sensitive element 13, the pressure plate 6 also has through holes at the corresponding positions of each mounting slot 8.
[0029] The specific working process of this utility model is as follows: Multiple non-threaded pressure-sensitive elements 13 are placed into the mounting groove 8 of the fixture body 1, and are batch and reliably fixed by limiting posts 5, pressure plates 6, and hexagonal screws 4. A set pressure is applied to the connecting air passage (manifold 7 and guide pipe 9) inside the fixture through the connecting nozzle 2, and the pressure is evenly applied to the pressure-sensing surface of each pressure-sensitive element 13. The entire fixture is placed in a high and low temperature test chamber, so that the batch performance testing of the pressure-sensitive elements under different temperature and pressure conditions can be realized.
[0030] Example 2
[0031] As attached Figure 6 As shown, in order to fix the threaded pressure-sensitive element 13 to the mounting groove 8, the mounting groove 8 in Embodiment 1 needs to be changed to a threaded mounting groove 8. Since the thread is used for fixing, there is no need to add a pressure plate 6.
[0032] 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 multi-batch low-temperature testing fixture for pressure-sensitive elements, characterized in that, The fixture includes a tooling body (1), a pressure plate (6), a manifold (7), an installation groove (8), and a guide pipe (9). The tooling body (1) has two manifolds (7) arranged in parallel inside, and a guide pipe (9) is also arranged perpendicular to the parallel manifolds (7). One end of the guide pipe (9) passes through the manifold (7) and connects to another manifold (7). The other end of the guide pipe (9) extends to the outside of the tooling body (1). The guide pipe (9) is connected to the manifolds (7) and the three pipes are connected, and the pipe openings are all threaded. The installation grooves (8) are symmetrically and evenly spaced on both sides of the tooling body (1), and there are 10 installation grooves on one side and a total of 20 on both sides. The surface of the tooling body (1) is covered with the pressure plate (6).
2. The multi-batch low-temperature testing fixture for pressure-sensitive elements according to claim 1, characterized in that, It also includes plugs (3), and plugs (3) are fixedly installed in the three ports of the manifold (7) and the one port of the guide pipe (9).
3. The multi-batch low-temperature testing fixture for pressure-sensitive elements according to claim 1, characterized in that, It also includes a connector (2), which is a pipe opening in the manifold (7) where no plug (3) is installed, and is fixedly provided with a connector (2).
4. The multi-batch low-temperature testing fixture for pressure-sensitive elements according to claim 1, characterized in that, It also includes a limiting post (5) and a limiting post threaded hole (11). The tooling body (1) is evenly provided with four limiting post threaded holes (11) along the center line. The limiting post (5) meshes with the tooling body (1) through the limiting post threaded hole (11), and the external thread of the limiting post (5) corresponds only to the internal thread of the limiting post threaded hole (11).
5. The multi-batch low-temperature testing fixture for pressure-sensitive elements according to claim 1, characterized in that, It also includes hexagonal screws (4) and hexagonal screw threaded holes (12). The tooling body (1) is evenly provided with five hexagonal screw threaded holes (12) along the center line, and is staggered with the limit post threaded holes (11). The hexagonal screws (4) penetrate the pressure plate (6) and engage with the hexagonal screw threaded holes (12) for fixation. The external thread of the hexagonal screws (4) corresponds only to the internal thread of the hexagonal screw threaded holes (12).
6. The multi-batch low-temperature testing fixture for pressure-sensitive elements according to claim 1, characterized in that, The pressure-sensitive element (13) is disposed in the mounting groove (8), and the upper surface of the pressure-sensitive element (13) is in contact with the pressure plate (6).
7. The multi-batch low-temperature testing fixture for pressure-sensitive elements according to claim 1, characterized in that, The bottom of the mounting groove (8) is connected to the guide pipe (9).