Differential pressure capacity expansion method leak detector
The differential pressure expansion method leak detector with dual gas source design and independent inflation detection pipeline solves the problems of low inflation efficiency and large vibration in the existing technology, and achieves efficient and reliable detection results.
Patent Information
- Application Number
- CN202422867828.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-09-16
- Estimated Expiration
- 2034-11-25
AI Technical Summary
Existing differential pressure expansion method leak detectors have low inflation efficiency, heavy single gas source load, and large vibration, which affects detection accuracy and is difficult to maintain.
It adopts a dual air source design, equipped with two air supply pumps and independent inflation detection pipelines, which are coordinated and controlled by the same controller to reduce vibration and facilitate maintenance. A pressure gauge is added to assist in displaying air pressure data.
It improves the inflation efficiency, reduces the impact of vibration on detection, simplifies the maintenance process, and improves detection accuracy and reliability.
Smart Images
Figure CN223346376U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of leak detection instruments, in particular to a leak detector using a differential pressure expansion method. Background Art
[0002] The core principle of a differential pressure expansion leak detector is differential pressure detection. The instrument incorporates two pressure sensors, one connected to a standard workpiece with known airtightness and the other to the sealed chamber of the workpiece being tested. When both sealed chambers are filled with test gas at the same pressure, if the workpiece being tested leaks, the internal pressure will gradually decrease, creating a pressure differential with the sealed chamber of the standard workpiece. This tiny pressure differential is measured by the highly sensitive differential pressure sensor, and the leak level of the workpiece being tested can be calculated based on the correlation between the pressure difference and the amount of leakage.
[0003] The existing differential pressure expansion method leak detector has the following problems when in use: its pressure generating system is usually a main gas source with a branch pipe to realize the gas transmission work of two branches, and through components such as a pressure regulating valve, it is responsible for regulating the detection gas pressure generated by the gas source to be stable to meet the detection needs of different workpieces. One gas source supplies two workpieces for inflation, and its inflation efficiency is low. At the same time, the load of its single gas source is large, and the vibration during operation is large, which can easily affect the differential pressure sensor and controller, and thus affect its subsequent detection work. In addition, its overall gas supply pipeline structure is a whole, which is difficult to maintain and repair. Utility Model Content
[0004] (1) Technical problems solved
[0005] In view of the deficiencies in the prior art, the present invention provides a differential pressure expansion method leak detector, which solves the problems raised by the background art.
[0006] (2) Technical solution
[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a differential pressure expansion method leak detector, comprising an instrument shell, the instrument shell comprising an outer shell, the inner wall of the outer shell being symmetrically fixedly connected to two rubber seats, an inflation mechanism being provided at the two rubber seats, the inflation mechanism being cooperated with a leak detection mechanism, the inflation mechanism comprising an air supply pump fixedly installed in the two rubber seats in a front-to-back symmetrical shape, an inflation detection pipeline being fixedly installed at the gas outlet at one end of the air supply pump, the inflation detection pipeline comprising a second pipe, an installation groove being provided at the top end of the second pipe, the leak detection mechanism comprising a controller fixedly installed at the top end of the outer shell, one end of the controller being connected to the air supply pump via a control line, a differential pressure sensor being fixedly installed in the installation groove, and the two differential pressure sensors being connected to the controller via a data line.
[0008] As a further solution of the present invention: the inflation detection pipeline also includes a first air guide tube fixedly connected to the gas outlet at one end of the air supply pump, a connector is fixedly installed at one end of the first air guide tube, a pressure gauge is fixedly installed at the top interface of the connector, a pressure regulating valve is fixedly installed at the interface of one end of the two connectors, the interface at one end of the connector is fixedly connected to the second pipeline, and an inflation control valve is fixedly installed at the interface at one end of the second pipeline.
[0009] As a further solution of the present invention: a control panel is provided on the top of the controller, a plurality of data interfaces are provided on the rear side of the other end of the controller, and a power supply interface is provided on the front side of one end of the controller.
[0010] As a further solution of the present invention: a mounting base is fixedly connected to the middle part of the lower part of the outer wall at the front and rear ends of the shell, two mounting holes are symmetrically provided between the upper and lower side walls of the mounting base, and a handle is fixedly connected to the middle part of the upper part of the outer wall at the front and rear ends of the shell, and the two handles are symmetrically arranged front to back.
[0011] Compared with the prior art, the beneficial effects of the present invention are:
[0012] 1. In the utility model, a shell is provided in which two rubber seats are symmetrically fixedly connected. Two air supply pumps are installed in the two rubber seats in a front-to-back symmetrical shape, and the inflation efficiency is high. Compared with the single air source design, the dual air sources share the load, thereby reducing the vibration during operation and reducing the impact on the detection work of the differential pressure sensor. In addition, each of the air supply pumps is provided with an inflation detection pipeline, which is conducive to maintenance and repair. At the same time, the two air supply pumps are controlled by the same controller and can cooperate to perform inflation differential pressure detection, which is more convenient.
[0013] 2. In the present invention, the controller is installed on the top of the shell, and the air supply pump is installed on the rubber seat inside the shell. The rubber seat can reduce the vibration transmitted to the shell by the operation of the air pump, thereby reducing the impact of the vibration on the operation of the controller. In addition, a pressure gauge is provided at the pipeline to assist in displaying the air pressure data, which can be used to compare with the air pressure detected by the differential pressure sensor to verify the reliability of the air pressure data. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is an overall three-dimensional diagram of the utility model;
[0015] Figure 2 This is a three-dimensional diagram of the instrument housing of the present utility model;
[0016] Figure 3 This is a three-dimensional diagram of the leak detection mechanism of the present utility model;
[0017] Figure 4 It is a three-dimensional diagram of the inflation mechanism of the present utility model.
[0018] In the figure: 1. Instrument shell; 2. Leak detection mechanism; 3. Inflating mechanism; 11. Outer shell; 12. Handle; 13. Mounting base; 14. Rubber base; 21. Controller; 22. Control panel; 23. Data interface; 24. Power supply interface; 25. Differential pressure sensor; 26. Data cable; 31. Air supply pump; 32. First air duct; 33. Control line; 34. Connector; 35. Pressure gauge; 36. Pressure regulating valve; 37. Second pipeline; 38. Mounting slot; 39. Inflating control valve. DETAILED DESCRIPTION
[0019] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0020] In the description of this utility model, unless otherwise specified, "plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction, and therefore should not be construed as limiting this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0021] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.
[0022] See also Figures 1 to 4In an embodiment of the present invention, a differential pressure expansion method leak detector includes an instrument case 1, which includes an outer shell 11. The inner wall of the outer shell 11 is symmetrically fixedly connected to two rubber seats 14. An inflation mechanism 3 is provided at the two rubber seats 14. The inflation mechanism 3 is cooperated with a leak detection mechanism 2. The inflation mechanism 3 includes an air supply pump 31 fixedly installed in the two rubber seats 14 in a front-to-back symmetrical shape. An inflation detection pipeline is fixedly installed at the gas outlet of one end of the air supply pump 31. The inflation detection pipeline includes a second pipe 37. A mounting groove 38 is provided at the top of the second pipe 37. The leak detection mechanism 2 includes a controller 21 fixedly installed at the top of the outer shell 11. One end of the controller 21 is connected to the outer shell 11 through a control line 33. The air supply pump 31 is connected, and a differential pressure sensor 25 is fixedly installed in the mounting groove 38. The two differential pressure sensors 25 are connected to the controller 21 through the data line 26. The whole is provided with a shell 11, in which two rubber seats 14 are symmetrically fixedly connected. The two rubber seats 14 are symmetrically equipped with two air supply pumps 31 in a front-to-back symmetrical shape. The inflation efficiency is high, and compared with the single air source design, the dual air sources share the load, reduce the vibration during operation, and reduce the impact on the detection work of the differential pressure sensor 25. In addition, they are respectively equipped with an inflation detection pipeline, which is conducive to maintenance and repair. At the same time, the two air supply pumps 31 are controlled by the same controller 21, and can cooperate to perform inflation differential pressure detection, which is more convenient.
[0023] The inflation detection pipeline also includes a first air duct 32 fixedly connected to the gas outlet at one end of the air supply pump 31, a connector 34 is fixedly installed at one end of the first air duct 32, a pressure gauge 35 is fixedly installed at the top interface of the connector 34, a pressure regulating valve 36 is fixedly installed at the interface of one end of the two connectors 34, a second pipe 37 is fixedly connected to the interface at one end of the connector 34, and an inflation control valve 39 is fixedly installed at the interface at one end of the second pipe 37, the controller 21 is installed at the top of the shell 11, and the air supply pump 31 is installed on the rubber seat 14 in the shell 11, the rubber seat 14 can reduce the vibration transmitted to the shell 11 by the operation of the air pump, thereby reducing the impact of the vibration on the operation of the controller 21, and the pipeline is provided with a pressure gauge 35, which can be used for auxiliary display of air pressure data for comparison with the air pressure detected by the differential pressure sensor 25 to verify the reliability of the air pressure data.
[0024] A control panel 22 is provided at the top of the controller 21 for controlling the controller 21. A plurality of data interfaces 23 are provided on the rear side of the other end of the controller 21, which can be connected to a computer via a connecting line to feed back the detection data of the leak detector. A power supply interface 24 is provided on the front side of one end of the controller 21, which can be connected to a power supply line to power the entire leak detector.
[0025] A mounting base 13 is fixedly connected to the middle part of the lower part of the outer wall at the front and rear ends of the shell 11. Two mounting holes are symmetrically provided between the upper and lower side walls of the mounting base 13. The mounting holes on the mounting base 13 can be used to cooperate with the mounting components to install the leak detector on the corresponding installation position. A handle 12 is fixedly connected to the middle part of the upper part of the outer wall at the front and rear ends of the shell 11. The two handles 12 are symmetrically arranged front and back, and the handles 12 can be held to move the entire leak detector.
[0026] The working principle of the present invention is as follows: there are two differential pressure sensors 25 inside the instrument, and two inflation control valves 39 are respectively connected to the sealed cavities of a standard workpiece with known good air tightness and the workpiece to be detected, and the pressure regulating valve 36 is used in conjunction with the pressure gauge 35 to adjust the detection gas pressure in the two sealed cavities to the same. When the pressure of the detection gas filled in the two sealed cavities is the same, if there is a leak in the workpiece to be detected, its internal pressure will gradually decrease, and a pressure difference will be generated with the sealed cavity of the standard workpiece. Its highly sensitive differential pressure sensor 25 measures this tiny pressure difference and transmits the data to the computer. The computer can calculate the leakage situation of the workpiece to be detected based on the corresponding relationship between the pressure difference and the leakage amount.
[0027] In addition, it should be noted that in the present invention, capacity expansion refers to a certain degree of volume expansion of the sealed cavity of the workpiece to be detected. The purpose of this is to amplify the pressure changes caused by the leakage, so that small leaks are easier to detect. For example, for some workpieces with a larger internal volume, the pressure changes of the detection gas in the cavity can be made more obvious through capacity expansion, thereby improving the detection accuracy.
[0028] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A differential pressure expansion method leak detector, comprising an instrument housing (1), wherein the instrument housing (1) comprises an outer shell (11); Its characteristics are: The inner wall of the housing (11) is symmetrically fixedly connected to two rubber seats (14), and an inflation mechanism (3) is provided at the two rubber seats (14), and the inflation mechanism (3) is provided in conjunction with a leak detection mechanism (2); The inflation mechanism (3) includes an air supply pump (31) fixedly installed in two rubber seats (14) in a front-to-back symmetrical shape, and an inflation detection pipeline is fixedly installed at the gas outlet of one end of the air supply pump (31). The inflation detection pipeline includes a second pipeline (37), and a mounting groove (38) is provided at the top of the second pipeline (37); The leak detection mechanism (2) comprises a controller (21) fixedly mounted on the top of the housing (11); one end of the controller (21) is connected to the air supply pump (31) via a control line (33); a differential pressure sensor (25) is fixedly mounted in the mounting groove (38); and two differential pressure sensors (25) are connected to the controller (21) via a data line (26).
2. The differential pressure expansion method leak detector according to claim 1, characterized in that: The inflation detection pipeline further comprises a first air guide tube (32) fixedly connected to the gas outlet at one end of the air supply pump (31), and a connector (34) is fixedly installed at one end of the first air guide tube (32).
3. The differential pressure expansion method leak detector according to claim 2, characterized in that: A pressure gauge (35) is fixedly installed at the top interface of the connector (34), a pressure regulating valve (36) is fixedly installed at the interfaces of the two connectors (34) at one end, and a second pipeline (37) is fixedly connected to the interface at one end of the connector (34).
4. The differential pressure expansion method leak detector according to claim 1, characterized in that: An inflation control valve (39) is fixedly installed at an interface at one end of the second pipeline (37).
5. The differential pressure expansion method leak detector according to claim 1, characterized in that: The top of the controller (21) is provided with a control panel (22), the rear side of the other end of the controller (21) is provided with a plurality of data interfaces (23), and the front side of one end of the controller (21) is provided with a power supply interface (24).
6. The differential pressure expansion method leak detector according to claim 1, characterized in that: A mounting seat (13) is fixedly connected to the middle portion of the lower side walls of the front and rear ends of the housing (11), and two mounting holes are symmetrically provided between the upper and lower side walls of the mounting seat (13).
7. The differential pressure expansion method leak detector according to claim 1, characterized in that: A handle (12) is fixedly connected to the middle portion of the upper outer side walls at both the front and rear ends of the shell (11), and the two handles (12) are arranged in a front-to-back symmetrical shape.