Detection regulation and control device for differential pressure type air tightness detector

Abstract

The utility model discloses a detection regulation and control device for a differential pressure type air tightness detector, which comprises a detector, an air source is arranged in the detector, a first air inlet pipe and a second air inlet pipe are respectively arranged at the air outlet end of one end of the air source, a detection piece is arranged at the air outlet end of the first air inlet pipe, and a second air inlet pipe is arranged at the air outlet end of the second air inlet pipe. A standard component is installed at the air outlet end of the second air inlet pipe, air outlet pipes are installed at the air outlet ends of the detection piece and the standard component, the air outlet pipes are in sealed connection with the detection piece and the standard component through threads, a pressure adjusting mechanism is installed above one end of each air outlet pipe, and a pressure sensor is installed at the other end of each air outlet pipe; a first piston is mounted in the pressure regulating mechanism, the lower end of the first piston seals an inner cavity of the pressure regulating mechanism, and a regulating column is mounted at the upper end of the first piston, so that the problem that the differential pressure type air tightness detector is troublesome to achieve unified air pressure regulation and control of the interiors of a detection piece and a standard piece is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of differential pressure air tightness detectors, in particular to a detection and control device for differential pressure air tightness detectors. Background Art

[0002] The differential pressure air tightness tester is a kind of testing equipment widely used in the field of industrial manufacturing, mainly used to test the sealing performance of products or components. With the increasingly stringent requirements of modern industry on product quality, air tightness testing has become an indispensable part of the production process. By filling a certain pressure of gas inside the tested part, and then comparing the pressure difference inside and outside the tested part to judge its sealing performance. When there is a leak in the tested part, the internal gas will escape through the leak point, causing the pressure difference between the inside and outside to change. The detector captures this change through a precise pressure sensor, and analyzes it through a data processing system, and finally obtains the sealing performance result of the tested part.

[0003] For example, the Chinese authorized patent "A dual-cavity detection regulator for differential pressure airtightness detector" with announcement number CN203785854U includes the differential pressure airtightness detector body, the gas source switching component and the cavity switching component. The gas source switching component is installed between the precision pressure reducing valve and the three-way pipe of the differential pressure airtightness detector body, and the cavity switching component is installed on the tested end of the differential pressure airtightness detector body. Under the premise of equal detection efficiency, a single instrument can be used to achieve dual-cavity detection.

[0004] Although the above-mentioned existing technology can realize the detection and regulation of air pressure, in actual use, due to the different air intake volumes of different intake pipes, it is more troublesome to achieve a unified air pressure regulation inside the detection part and the standard part, which affects the detection efficiency. Therefore, it does not meet the existing needs. In this regard, we propose a detection and control device for a differential pressure air tightness tester. Utility Model Content

[0005] The utility model aims to provide a detection and control device for a differential pressure airtightness tester to solve the problem that it is troublesome to control the differential pressure airtightness tester to achieve a unified air pressure inside the detection part and the standard part in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a detection and control device for a differential pressure air tightness detector, comprising a detector, an air source is installed inside the detector, and an air outlet end at one end of the air source is respectively installed with a first air inlet pipe and a second air inlet pipe, a detection component is installed at the air outlet end of the first air inlet pipe, and the first air inlet pipe and the detection component are connected by a threaded seal, a standard component is installed at the air outlet end of the second air inlet pipe, and the second air inlet pipe and the standard component are connected by a threaded seal, air outlet ends of the detection component and the standard component are both installed with air outlet pipes, and the air outlet pipes are respectively connected to the detection component and the standard component by threaded seals, a pressure regulating mechanism is installed above one end of the air outlet pipe, a pressure sensor is installed at the other end of the air outlet pipe, a first piston is installed inside the pressure regulating mechanism, and the lower end of the first piston forms a seal with the inner cavity of the pressure regulating mechanism, an adjusting column is installed at the upper end of the first piston, and the adjusting column and the pressure regulating mechanism are slidably limited.

[0007] Preferably, a servo motor is fixedly mounted on the upper end surface of the pressure regulating mechanism, a stud is mounted on the output shaft of the servo motor, and the lower end of the stud extends to the inside of the adjusting column, and the external thread of the stud is matched with the internal thread hole of the adjusting column.

[0008] Preferably, a first solenoid valve is installed at one end outside the first air intake pipe, and a second solenoid valve is installed at one end outside the second air intake pipe.

[0009] Preferably, the other ends of the first air inlet pipe and the second air inlet pipe are both installed with a leak-proof mechanism, a fixed block is fixedly provided on one side inside the leak-proof mechanism, and ventilation holes are provided on all sides inside the fixed block, a support column is fixedly provided on one side of the fixed block, a movable rod is installed on one side of the support column, and the movable rod is slidably connected to the support column, a spring is fixedly provided between the support column and the movable rod, a second piston is fixedly provided on one side of the movable rod, and one side of the second piston forms a seal with the inner cavity of the leak-proof mechanism.

[0010] Preferably, a flow sensor is installed on the first air intake pipe at one side of the first solenoid valve.

[0011] Preferably, an indicator light is installed on the upper end surface of the detector.

[0012] Preferably, an operation panel is provided on the front end surface of the detector.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The utility model is provided with a pressure regulating mechanism. When the detector inflates the inside of the test piece and the standard piece, the pressure sensor can monitor the pressure values ​​inside the test piece and the standard piece in real time. Due to the different air intake volumes of different intake pipes, after the solenoid valve is closed, the air pressure is prone to be too high in the product. At this time, the servo motor is turned on by the processor, and its output shaft drives the stud to rotate, so that its external thread rubs against the internal screw hole of the adjusting column, converting the rotational motion into linear motion, thereby driving the first piston to move up a short distance, so that the lower channel of the pressure regulating mechanism is connected to the upper channel. At this time, the internal gas can be discharged through the gap between the first piston and the inner cavity. After the discharge, the servo motor quickly opens in the reverse direction, so that the first piston closes the inner cavity, thereby reducing the pressure inside the corresponding product and realizing the unification of the internal air pressure of the test piece and the standard piece before testing. Moreover, this regulation method does not require manual participation and has high accuracy, meeting the needs of product testing.

[0015] 2. The utility model installs a flow sensor at one end of the first air inlet pipe. If there is a major problem with the test piece, although the gas source can continuously inject gas to raise its internal air pressure to a set value, the injected gas always maintains a flow rate during the process, and the abnormality can be detected in time by the flow sensor. That is, when the air pressure of the test piece is constant, the air still keeps flowing, unlike the standard part, when the internal air pressure reaches a constant value, the air flow speed slows down or even stops. At this time, the processor turns on the indicator light, allowing the staff to take out the unqualified parts as soon as possible, thereby eliminating the subsequent testing process and improving the inspection efficiency of the product.

[0016] 3. The utility model is provided with a leak-proof mechanism. When the air is transported to the air inlet pipe through the air source, the high-speed flowing gas contacts the second piston and creates pressure, driving the movable rod to contract toward the inside of the support column, so that a gap is formed between the second piston and the inner cavity of the leak-proof mechanism. At this time, air can enter the inside of the detection part and the standard part through the gap to complete the pressurization work. After the air source is closed, the pressure on the second piston is small, and the second piston is driven to close the inner cavity under the reset of the spring, thereby avoiding pressure imbalance inside the detection part and the standard part, and further providing a prerequisite for accurate detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional diagram of the utility model;

[0018] Figure 2 This is a schematic diagram of the internal structure of the voltage regulating mechanism of the utility model;

[0019] Figure 3 This is a schematic diagram of the internal structure of the leak-proof mechanism of the utility model;

[0020] Figure 4 This is a schematic diagram of the detection and control principle of the utility model.

[0021] In the figure: 1. detector; 2. first air inlet pipe; 3. second air inlet pipe; 4. first solenoid valve; 5. second solenoid valve; 6. flow sensor; 7. anti-leakage mechanism; 8. air outlet pipe; 9. pressure sensor; 10. pressure regulating mechanism; 11. detection part; 12. standard part; 13. first piston; 14. adjusting column; 15. servo motor; 16. stud; 17. fixing block; 18. supporting column; 19. movable rod; 20. spring; 21. second piston. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0023] See also Figure 1-4 The utility model provides an embodiment: a detection and control device for a differential pressure air tightness detector, comprising a detector 1, an air source is installed inside the detector 1, a first air inlet pipe 2 and a second air inlet pipe 3 are installed at one end of the air source, a detection component 11 is installed at the air outlet end of the first air inlet pipe 2, and the first air inlet pipe 2 and the detection component 11 are connected by threaded sealing, a standard component 12 is installed at the air outlet end of the second air inlet pipe 3, and the second air inlet pipe 3 and the standard component 12 are connected by threaded sealing, the detection The air outlet ends of the detection component 11 and the standard component 12 are both equipped with an air outlet pipe 8, and the air outlet pipe 8 is respectively connected to the detection component 11 and the standard component 12 through threaded sealing. A pressure regulating mechanism 10 is installed above one end of the air outlet pipe 8, and a pressure sensor 9 is installed at the other end of the air outlet pipe 8. A first piston 13 is installed inside the pressure regulating mechanism 10, and the lower end of the first piston 13 forms a seal with the inner cavity of the pressure regulating mechanism 10. An adjusting column 14 is installed at the upper end of the first piston 13, and the adjusting column 14 and the pressure regulating mechanism 10 are slidably limited.

[0024] When the detector 1 inflates the inside of the detection part 11 and the standard part 12, the pressure sensor 9 can monitor the pressure values ​​inside the detection part 11 and the standard part 12 in real time. Due to the different air intake volumes of different intake pipes, after the solenoid valve is closed, the air pressure is prone to be too high in the product. At this time, the servo motor 15 is turned on by the processor, and its output shaft drives the stud 16 to rotate, so that its external thread rubs against the internal screw hole of the adjusting column 14, converting the rotational motion into linear motion, thereby driving the first piston 13 to move up a short distance, so that the lower channel of the pressure regulating mechanism 10 is connected to the upper channel. At this time, the internal gas can be discharged through the gap between the first piston 13 and the inner cavity. After the discharge, the servo motor 15 is quickly turned on in the opposite direction, so that the first piston 13 closes the inner cavity, thereby reducing the pressure inside the corresponding product and achieving the unification of the internal air pressure of the detection part 11 and the standard part 12 before testing.

[0025] See also Figure 1 and Figure 2 A servo motor 15 is fixedly mounted on the upper end surface of the pressure regulating mechanism 10, and a stud 16 is mounted on the output shaft of the servo motor 15, and the lower end of the stud 16 extends to the inside of the adjusting column 14, and the external thread of the stud 16 is matched with the internal thread hole of the adjusting column 14. This control method does not require manual participation and has high precision, meeting the needs of product testing.

[0026] See also Figure 1 A first solenoid valve 4 is installed at one end outside the first intake pipe 2, and a second solenoid valve 5 is installed at one end outside the second intake pipe 3. When the set air pressure is reached inside the detection part 11 and the standard part 12, the intake pipe will be closed through the first solenoid valve 4 and the second solenoid valve 5.

[0027] See also Figure 1 and Figure 3 The other ends of the first air inlet pipe 2 and the second air inlet pipe 3 are both installed with a leak-proof mechanism 7, a fixed block 17 is fixedly provided on one side of the inside of the leak-proof mechanism 7, and vents are provided around the inside of the fixed block 17, a support column 18 is fixedly installed on one side of the fixed block 17, a movable rod 19 is installed on one side of the support column 18, and the movable rod 19 is slidably connected to the support column 18, a spring 20 is fixedly installed between the support column 18 and the movable rod 19, a second piston 21 is fixedly installed on one side of the movable rod 19, and one side of the second piston 21 forms a seal with the inner cavity of the leak-proof mechanism 7, thereby avoiding pressure imbalance between the detection part and the standard part, and further providing a prerequisite for accurate detection.

[0028] See also Figure 1 A flow sensor 6 is installed on the first air intake pipe 2 at one side of the first solenoid valve 4, and is used to detect the gas flow speed inside the first air intake pipe 2 when the detection element 11 is pressurized.

[0029] See also Figure 1 An indicator light is installed on the upper end surface of the detector 1 to indicate whether the detected part 11 is a defective product.

[0030] See also Figure 1 The front end of the detector 1 is provided with an operation panel for the staff to operate the detector 1 .

[0031] Working principle: when air is transported to the air inlet pipe through the air source, the high-speed flowing gas contacts the second piston 21 and creates pressure, driving the movable rod 19 to shrink toward the inside of the support column 18, so that a gap is formed between the second piston 21 and the inner cavity of the leak-proof mechanism 7. At this time, air can enter the interior of the detection part 11 and the standard part 12 through the gap to complete the pressurization work. After the air source is turned off, the pressure on the second piston 21 is small. Under the reset of the spring 20, the second piston 21 is driven to close the inner cavity, thereby avoiding the pressure imbalance inside the detection part 11 and the standard part 12. If there is a big problem with the detection part 11, although the air source can continuously inject air to raise its internal air pressure to the set value, the injected gas maintains the flow rate during the process, and the abnormality can be detected in time by the flow sensor 6, that is, when the air pressure of the detection part 11 is constant, the air still keeps flowing, but it is not like the standard part. After the internal air pressure reaches a constant value, the air flow speed slows down or even stops. At this time, the processor turns on the indicator light, allowing the staff to take out the unqualified parts as soon as possible.

[0032] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A detection and control device for a differential pressure air tightness detector, comprising a detector (1), wherein an air source is installed inside the detector (1), and a first air inlet pipe (2) and a second air inlet pipe (3) are installed at one air outlet end of the air source, respectively, a detection component (11) is installed at the air outlet end of the first air inlet pipe (2), and the first air inlet pipe (2) and the detection component (11) are connected by a threaded seal, and a standard component (12) is installed at the air outlet end of the second air inlet pipe (3), and the second air inlet pipe (3) and the standard component (12) are connected by a threaded seal, characterized in that: The gas outlet ends of the detection component (11) and the standard component (12) are both equipped with gas outlet pipes (8), and the gas outlet pipes (8) are respectively connected to the detection component (11) and the standard component (12) through threaded sealing. A pressure regulating mechanism (10) is installed above one end of the gas outlet pipe (8), and a pressure sensor (9) is installed at the other end of the gas outlet pipe (8). A first piston (13) is installed inside the pressure regulating mechanism (10), and the lower end of the first piston (13) forms a seal with the inner cavity of the pressure regulating mechanism (10). An adjusting column (14) is installed at the upper end of the first piston (13), and the adjusting column (14) and the pressure regulating mechanism (10) are slidably limited.

2. A detection and control device for a differential pressure air tightness detector according to claim 1, characterized in that: A servo motor (15) is fixedly mounted on the upper end surface of the pressure regulating mechanism (10), a stud (16) is mounted on the output shaft of the servo motor (15), and the lower end of the stud (16) extends into the interior of the regulating column (14), and the external thread of the stud (16) is matched with the internal thread hole of the regulating column (14).

3. The detection and control device for a differential pressure airtightness detector according to claim 1, characterized in that: A first solenoid valve (4) is installed at one end outside the first air intake pipe (2), and a second solenoid valve (5) is installed at one end outside the second air intake pipe (3).

4. The detection and control device for a differential pressure air tightness detector according to claim 1, characterized in that: The other ends of the first air intake pipe (2) and the second air intake pipe (3) are both provided with a leak-proof mechanism (7); a fixed block (17) is fixedly provided on one side of the inside of the leak-proof mechanism (7); and ventilation holes are provided around the inside of the fixed block (17); a support column (18) is fixedly provided on one side of the fixed block (17); a movable rod (19) is installed on one side of the support column (18); and the movable rod (19) is slidably connected to the support column (18); a spring (20) is fixedly provided between the support column (18) and the movable rod (19); a second piston (21) is fixedly provided on one side of the movable rod (19); and one side of the second piston (21) forms a seal with the inner cavity of the leak-proof mechanism (7).

5. The detection and control device for a differential pressure air tightness detector according to claim 1, characterized in that: A flow sensor (6) is installed on the first air intake pipe (2) at one side of the first solenoid valve (4).

6. The detection and control device for a differential pressure airtightness detector according to claim 1, characterized in that: An indicator light is installed on the upper end surface of the detector (1).

7. The detection and control device for a differential pressure airtightness detector according to claim 1, characterized in that: The front end surface of the detector (1) is provided with an operation panel.

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