Leakage testing device

Abstract

The invention provides a leakage testing device, and relates to the technical field of low-pressure gas leakage testing. The leakage test device comprises a manual adjustment air source supply assembly which comprises a first air source and a first adjustable air resistor; the automatic configuration air source supply assembly comprises a second air source and a second adjustable air resistor; one end of the gas path change-over switch is connected to the gas inlet pipe, and the gas path change-over switch is used for achieving switchable connection between the gas inlet pipe and the manual adjustment gas source supply assembly or the automatic configuration gas source supply assembly; the pressure gauge is used for monitoring the pressure of the low-pressure gas output by the manual adjustment gas source supply assembly and the automatic configuration gas source supply assembly; one end of the air inlet pipe is connected to the air path change-over switch, and the other end is connected to the test piece; one end of the air outlet pipe is connected to the test piece and the other end is connected to the pressure gauge; and the flow meter is communicated with the air inlet pipe and is arranged between the air path change-over switch and the test piece. The leakage testing device can realize convenient switching of the air source and can improve the accuracy of leakage testing.

Description

Technical Field

[0001] The invention relates to the technical field of low-pressure gas leakage testing, and in particular to a leakage testing device. Background Art

[0002] Gas leakage is an important indicator in gas circuit design and requires precise testing and strict control. For example, equipment such as ventilators, nebulizers and gas hoses need to be leak tested before assembly or use to detect the sealing performance of the equipment.

[0003] In some related technologies, when a target device is leak tested, it is usually installed and fixedly connected to a single gas source, which has insufficient functionality, and the gas pressure output by the gas source fluctuates greatly, making it difficult to maintain the gas pressure required for the leak test, resulting in poor test results. Summary of the invention

[0004] The purpose of the present invention is to overcome the problems of insufficient functionality and poor testing effect in the related art when performing leakage testing, and to provide a leakage testing device that can realize gas source switching and has multiple functions and high testing accuracy.

[0005] Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

[0006] The present invention provides a leakage testing device, which comprises:

[0007] A manually adjustable air source supply assembly includes a first air source and a first adjustable air resistance;

[0008] Automatically configure the gas source supply assembly, including a second gas source and a second adjustable gas resistance;

[0009] An air circuit switch, one end of which is connected to the air inlet pipe, for realizing a switchable connection between the air inlet pipe and the manually adjustable air source supply component or the automatically configured air source supply component;

[0010] A pressure gauge for monitoring the pressure of the low-pressure gas output by the manually adjustable gas source supply assembly and the automatically configured gas source supply assembly;

[0011] An air inlet pipe, one end of which is connected to the air path switch, and the other end of which is connected to the test piece;

[0012] An air outlet pipe, one end of which is connected to the test piece, and the other end of which is connected to the pressure gauge;

[0013] a flow meter connected to the air inlet pipe, disposed between the air path switch and the test piece, and used for performing a leakage test on a closed air path formed by the manually adjusted air source supply assembly, the automatically configured air source supply assembly, the air inlet pipe, the air outlet pipe and the test piece;

[0014] The first adjustable gas resistance is used to adjust the pressure of the gas output by the first gas source, and the second adjustable gas resistance is used to adjust the pressure of the gas output by the second gas source, so that the pressure of the low-pressure gas meets the pressure of the gas required for the leakage test.

[0015] In an exemplary embodiment of the present invention, based on the aforementioned scheme, the leakage testing device further includes: a first air circuit switch, connected in parallel with the test piece, one end of which is connected to the air inlet pipe, and the other end of which is connected to the air outlet pipe; wherein, when the air circuit switching switch and the first air circuit switch are closed, the flow meter is used to perform a self-leakage test on the leakage testing device.

[0016] In an exemplary embodiment of the present invention, based on the aforementioned scheme, the manually adjustable air source supply assembly further includes: a second air circuit switch, disposed between the first air source and the first adjustable air resistance, for connecting or disconnecting the first air source and the first adjustable air resistance.

[0017] In an exemplary embodiment of the present invention, based on the aforementioned scheme, the first adjustable gas resistance includes: a first pressure reducing valve, one end of which is connected to the first gas source, and is used to reduce the pressure of the gas output by the first gas source to a preset range to obtain reduced-pressure gas; a second pressure reducing valve, one end of which is connected to the first pressure reducing valve and the other end of which is connected to the gas circuit switching switch, and is used to adjust the pressure of the reduced-pressure gas to obtain the low-pressure gas.

[0018] In an exemplary embodiment of the present invention, based on the above-mentioned solution, the automatic configuration gas source supply component also includes: a gas container, which is arranged between the second gas source and the second adjustable gas resistance, and is used to stabilize the pressure of the gas output by the second gas source.

[0019] In an exemplary embodiment of the present invention, based on the aforementioned scheme, the second adjustable gas resistance includes: a pre-gas resistance, one end of which is connected to the second gas source, and is used to initially adjust the pressure of the gas output by the second gas source to obtain the preliminarily adjusted gas; a needle valve, one end of which is connected to the pre-gas resistance, and the other end is connected to the gas circuit switching switch, and is used to fine-tune the pressure of the preliminarily adjusted gas to obtain the low-pressure gas.

[0020] In an exemplary embodiment of the present invention, based on the aforementioned scheme, the air inlet pipe includes: a low-pressure air source output port, located at an end of the air inlet pipe away from the air circuit switching switch, and the test piece and the low-pressure air source output port are closed and connected by a first quick-insert tube.

[0021] In an exemplary embodiment of the present invention, based on the aforementioned solution, the air outlet pipe includes: a low-pressure air source detection port located at one end of the air outlet pipe close to the pressure gauge, and the test piece and the low-pressure air source detection port are closed and connected by a second quick-release tube.

[0022] In an exemplary embodiment of the present invention, based on the above solution, when the test is self-sealing, the test piece is connected to the air inlet pipe and the air outlet pipe respectively through a three-way pipe.

[0023] In an exemplary embodiment of the present invention, based on the above solution, the first gas source is a portable high-pressure gas source, and the second gas source is an air pump.

[0024] It can be seen from the above technical solution that the present invention has at least one of the following advantages and positive effects:

[0025] The leakage test device in the present invention may include a manually adjustable gas source supply component, an automatically configured gas source supply component, a gas circuit switching switch, a pressure gauge, an air inlet pipe, an air outlet pipe and a flow meter. On the one hand, the gas circuit switch can arbitrarily select the manually adjusted gas source supply component or the automatically configured gas source supply component to supply gas, thereby improving the selectivity and functionality of the leakage test; on the other hand, through the first adjustable gas resistance and the second adjustable gas resistance, the pressure of the gas output by the gas source can accurately reach the pressure of the gas required for the leakage test, thereby ensuring the effect of the test; on the other hand, the gas pressure can be understood in real time through the indication of the pressure gauge, and then the gas pressure can be adjusted in time through the first adjustable gas resistance and the second adjustable gas resistance, the fluctuation of the gas pressure can be controlled, and the accuracy of the leakage test can be improved; on the other hand, the flow rate of the gas can be understood in real time through the indication of the flow meter, and the data visualization of the gas leakage can be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

[0027] Figure 1 Schematic diagram of the connection structure of the leakage testing device in the embodiment of the present invention.

[0028] The main components in the figure are described as follows:

[0029] 1. Manually adjust the gas supply assembly; 11. First gas source; 12. First adjustable gas resistance; 13. Second gas circuit switch; 121. First pressure reducing valve; 122. Second pressure reducing valve;

[0030] 2. Automatically configure the gas source supply assembly; 21. Second gas source; 22. Second adjustable gas resistance; 23. Gas capacity; 211. Electric control switch; 221. Pre-gas resistance; 222. Needle valve;

[0031] 3. Gas circuit switch;

[0032] 4. Pressure gauge;

[0033] 5. Air inlet pipe; 51. Low-pressure air source output port;

[0034] 6. Air outlet pipe; 61. Low-pressure air source detection port;

[0035] 7. Flow meter;

[0036] 8. Test piece;

[0037] 9. First gas circuit switch. DETAILED DESCRIPTION

[0038] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0039] The features, structures or characteristics described above may be combined in one or more embodiments in any suitable manner, and if possible, the features discussed in each embodiment are interchangeable. In the above description, many specific details are provided to provide a full understanding of the embodiments of the present invention. However, those skilled in the art will appreciate that the technical solution of the present invention may be practiced without one or more of the specific details, or other methods, components, materials, etc. may be adopted. In other cases, known structures, materials or operations are not shown or described in detail to avoid blurring the various aspects of the present invention.

[0040] Although relative terms such as "upper" and "lower" are used in the present invention to describe the relative relationship of one component of the illustration to another component, these terms are used in the present invention only for convenience, such as according to the direction of the examples in the drawings. It is understood that if the device of the illustration is turned over and turned upside down, the component described as being "upper" will become the component "lower". Other relative terms such as "high", "low", "top", "bottom", "front", "back", "left", "right", etc. are also used to have similar meanings. When a structure is "on" other structures, it may mean that the structure is formed integrally on the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure through another structure.

[0041] In the present invention, the terms "a", "an", "the", "" and "at least one" are used to indicate the presence of one or more elements / components / etc.; the terms "comprising", "including" and "having" are used to express an open-ended inclusion and mean that additional elements / components / etc. may exist in addition to the listed elements / components / etc.; the terms "first", "second" and "third" etc. are used only as labels and are not intended to limit the quantity of their objects.

[0042] Leak testing is an important means of testing the airtightness of equipment or systems, which can ensure that gases are used or stored safely and effectively within the design range. For example, ventilators, as an important device that can artificially replace the function of autonomous ventilation, have been widely used in scenarios such as respiratory failure caused by multiple factors, anesthesia respiratory management during major surgery, respiratory support therapy, and emergency resuscitation. At present, the design of the whole ventilator usually first carries out a highly integrated module design, and then each module is assembled according to a certain assembly method. Before assembly, the performance of each module needs to be tested separately. Among them, the gas leakage amount is an important indicator in the system gas circuit design, which needs to be accurately tested and strictly controlled. At present, conventional leak tests can only simply monitor whether there is a leak in the pipeline and the approximate leakage amount. It is impossible to accurately control the detection air pressure and it is impossible to know the exact leakage amount. It is usually fixedly connected to the gas source and installed, and is not portable. It is difficult to apply to equipment such as ventilators that require precise control of air pressure.

[0043] In addition, in some related technologies, when leak testing is performed on the target equipment, it is usually fixedly connected to a single gas source and installed, which has insufficient functionality, and the gas pressure output by the gas source fluctuates greatly, making it difficult to maintain the gas pressure required for the leak test, resulting in poor test results.

[0044] In order to solve all or part of the technical problems in the above-mentioned related technologies, an embodiment of the present invention provides a leakage testing device, which may include: a manually adjustable air source supply component, including a first air source and a first adjustable air resistance; an automatically configured air source supply component, including a second air source and a second adjustable air resistance; an air circuit switching switch, one end of which is connected to the air inlet pipe, for realizing a switchable connection between the air inlet pipe and the manually adjustable air source supply component or the automatically configured air source supply component; a pressure gauge for monitoring the pressure of the low-pressure gas output by the manually adjustable air source supply component and the automatically configured air source supply component; an air inlet A tube, one end of which is connected to the gas circuit switching switch, and the other end is connected to the test piece; an air outlet pipe, one end of which is connected to the test piece, and the other end is connected to the pressure gauge; a flow meter, which is connected to the air inlet pipe and is arranged between the air circuit switching switch and the test piece, is used to perform leakage test on the closed air circuit formed by the manually adjusted air source supply component, the automatically configured air source supply component, the air inlet pipe, the air outlet pipe and the test piece; wherein the first adjustable air resistance is used to adjust the pressure of the gas output by the first air source, and the second adjustable air resistance is used to adjust the pressure of the gas output by the second air source, so that the pressure of the low-pressure gas meets the pressure of the gas required for the leakage test.

[0045] The leakage testing device in the above-mentioned embodiment, through the mutual relationship and function between each component, on the one hand, can arbitrarily choose to manually adjust the gas source supply component or automatically configure the gas source supply component to supply gas through the gas circuit switch, thereby improving the selectivity and functionality of the leakage test; on the other hand, through the first adjustable gas resistance and the second adjustable gas resistance, the pressure of the gas output by the gas source can accurately reach the pressure of the gas required for the leakage test, thereby ensuring the test effect; on the other hand, the gas pressure can be understood in real time through the indication of the pressure gauge, and then the gas pressure can be adjusted in time through the first adjustable gas resistance and the second adjustable gas resistance to control the fluctuation of the gas pressure and improve the accuracy of the leakage test; on the other hand, the gas flow can be understood in real time through the indication of the flow meter, and the data visualization of the gas leakage amount can be realized.

[0046] refer to Figure 1 The leakage testing device in the present invention may include a manually adjustable air source supply component 1, an automatically configured air source supply component 2, an air circuit switching switch 3, a pressure gauge 4, an air inlet pipe 5, an air outlet pipe 6 and a flow meter 7, wherein the manually adjustable air source supply component 1 may include a first air source 11 and a first adjustable air resistance 12, and the automatically configured air source supply component 2 may include a second air source 21 and a second adjustable air resistance 22.

[0047] Among them, the manually adjustable gas source supply component 1 can represent a gas source supply component that needs to manually adjust the pressure of the output gas. The manually adjustable gas source supply component 1 can be composed of a first gas source 11 and a first adjustable gas resistor 12. The first adjustable gas resistor 12 can be used to adjust the pressure of the gas output by the first gas source 11, so that the pressure of the low-pressure gas output by the manually adjustable gas source supply component 1 can meet the pressure of the gas required for the leakage test. Specifically, the first gas source can be a component that can provide high-pressure gas, and for a specific test piece, the gas pressure during operation is usually low. Therefore, when performing a leakage test on it, the input gas pressure should be within the gas pressure range of the test piece during operation to ensure the effectiveness and accuracy of the test, and then it is necessary to reduce the pressure of the gas output by the first gas source through a gas pressure regulating component such as a gas resistor to meet the test pressure.

[0048] In an exemplary embodiment, the first gas source 11 may be a portable high-pressure gas source. The portable high-pressure gas source can make the leakage test device portable, and facilitate the movement and installation of the leakage test device. Exemplarily, the first gas source 11 may be a high-pressure gas cylinder, a portable oxygen generator, or other portable high-pressure gas sources such as a portable liquid gas tank and a portable compressed air tank that can store and release enough gas to meet the needs of leakage testing. When the portable high-pressure gas source releases gas, the gas pressure is usually high and it is not easy to control the pressure of the output gas, so the pressure can be reduced by the first adjustable gas resistance 12.

[0049] The automatic configuration of the gas source supply component 2 can be a gas source supply component that can automatically configure or set the pressure of the output gas. The automatic configuration of the gas source supply component 2 can be composed of a second gas source 21 and a second adjustable gas resistor 22. The second adjustable gas resistor 22 can be used to accurately adjust the pressure of the gas output by the second gas source 21, so that the pressure of the low-pressure gas output by the automatic configuration of the gas source supply component 2 can meet the pressure of the gas required for the leakage test. Among them, the second gas source 21 can have the function of automatically configuring or setting the output gas pressure, and can automatically adjust and stabilize the pressure of the output gas. Exemplarily, the start or stop of the second gas source 21 can be controlled by the electric control switch 211. When the gas reserve of the first gas source 11 is insufficient or cannot maintain the gas pressure required for the test, gas delivery can be carried out through the second gas source 21. When the pressure of the gas emitted by the second gas source 21 is higher or lower, or there is a fluctuation, the air pressure can be accurately adjusted by the second adjustable gas resistor 22.

[0050] In an exemplary embodiment, the second gas source 21 may be an air pump. An air pump is a device that can be used to deliver gas, and is usually composed of a drive device and a compressor. In actual use, the air pressure outputted by the air pump can be set by a built-in pressure setting unit, so that the air pressure outputted by the air source can quickly meet the air pressure required for the leak test, thereby improving the efficiency of the leak test. In addition, the volume of the air pump is usually small, and during the leak test, there is no need to be limited to a specific site, thereby facilitating the use and testing of the operator.

[0051] The gas circuit switching switch 3 may represent a component for controlling the selection of the gas source supply path, allowing the operator to select and switch the gas source between the manually adjusted gas source supply component 1 and the automatically configured gas source supply component 2, thereby realizing the selective control of the two different modes of gas sources supplying gas to the air intake pipe, and improving the selectivity and functionality of the leakage test device. Exemplarily, the gas circuit switching switch 3 can realize gas circuit switching by manual operation. When the gas circuit switching or selection is required, the operator can manually adjust the gas circuit switching switch 3 to switch or select the gas source. The gas circuit switching switch 3 can also realize automatic switching. Specifically, the gas circuit switching switch 3 can have a built-in airflow detection component. When the airflow detection component detects insufficient airflow or too low air pressure, the gas circuit switching switch 3 can automatically cut off the connection with the current gas source supply component, connect the gas circuit switching switch 3 to another gas source supply component, and send switching information to the control unit at the same time to remind the operator to shut down or start the gas source, thereby improving the practicality of the leakage test device. Illustratively, when the gas circuit switching switch 3 is connected to the manually adjusted gas source supply component 1, when the airflow detection component detects that the airflow in the current gas circuit is insufficient or the air pressure is too low, the gas circuit switching switch 3 can automatically cut off the connection with the manually adjusted gas source supply component 1, connect the gas circuit switching switch 3 to the automatically configured gas source supply component 2, and supply gas through the second gas source 21.

[0052] The pressure gauge 4 may represent a component capable of detecting and displaying the gas pressure in the gas circuit. During a low-pressure leak test, the gas pressure can be understood in real time through the indication of the pressure gauge 4, and the gas pressure can be adjusted in time through the first adjustable gas resistance 12 and the second adjustable gas resistance 22 to control the fluctuation of the gas pressure and improve the accuracy of the leak test.

[0053] The air inlet pipe 5 may represent a pipeline for inputting gas into the test piece 8. The air outlet pipe 6 may represent a pipeline for the gas outputted from the test piece 8. Through the air inlet pipe 5 and the air outlet pipe 6, a detachable connection between the test piece 8 and the leakage test device may be achieved. The material of the air inlet pipe 5 and the air outlet pipe 6 may be plastic material, stainless steel material, glass material or other suitable material. The material of the air inlet pipe 5 and the air outlet pipe 6 is not particularly limited in this exemplary embodiment.

[0054] The flowmeter 7 can represent a component that can measure the flow rate or flow velocity of gas when it passes through a certain cross section in a closed pipeline. In the leakage test, the leakage of the gas can be determined by observing the indication of the flowmeter 7, and the closed gas circuit formed by the manually adjusted gas source supply component 1, the automatically configured gas source supply component 2, the air inlet pipe 5, the air outlet pipe 6 and the test piece 8 is subjected to a leakage test. The indication of the flowmeter can be used to understand the flow rate of the gas in real time and realize data visualization of the gas leakage amount. Preferably, the flowmeter 7 is a float flowmeter. Among them, the float flowmeter has a simple structure, usually consisting of a pipeline, a float and a reading component, which can make the installation and maintenance of the overall device easier. In addition, the float flowmeter uses the principle of the rise and fall of the float to measure the gas. Through calibration and adjustment, a higher measurement accuracy can be achieved, thereby improving the accuracy of the low-pressure leakage test.

[0055] The test piece 8 may represent a specific device or component that needs to be tested for gas leakage. Exemplarily, the test piece may be a ventilator or a component of a ventilator. For example, the test piece may be a compressor built into the ventilator, or an airway pipe in the ventilator, or a filter or other component in the ventilator. Of course, the test piece may also be other equipment that needs to be tested for leakage, such as a nebulizer and a gas hose.

[0056] In an exemplary embodiment, the leakage test device further includes a first gas circuit switch 9, which is connected in parallel with the test piece 8, one end of which is connected to the air inlet pipe 5, and the other end of which is connected to the air outlet pipe 6. When the gas circuit switching switch 3 and the first gas circuit switch 9 are closed, the flow meter 7 is used to perform a self-leakage test on the leakage test device.

[0057] Specifically, refer to Figure 1 As shown, when the gas circuit switching switch 3 and the first gas circuit switch 9 are closed, the gas provided by the gas source supply component does not pass through the test piece, but passes through the gas circuit branch where the first gas circuit switch 9 is located, so as to determine whether the leakage test device has self-leakage by observing the display of the flow meter 7. Exemplarily, when the flow meter 7 is a float flow meter, if the float in the float flow meter is at the highest point, it means that the leakage test device has no leakage; if the float flow meter has an indication, it means that the leakage test device has self-leakage, and the gas leakage amount is the indication of the float flow meter. By performing a self-leakage test on the leakage test device, the airtightness of the leakage test device can be ensured, thereby preventing the accuracy of the leakage test of the test piece from being affected by the self-leakage of the leakage test device. It can be understood that when performing a leakage test, the first gas circuit switch 9 is in an off state so that the gas output by the gas source supply component enters the test piece 8.

[0058] In an exemplary embodiment, the manually adjustable gas source supply assembly 1 may further include a second gas circuit switch 13, which is disposed between the first gas source 11 and the first adjustable gas resistor 12, and is used to connect or disconnect the first gas source 11 and the first adjustable gas resistor 12. Specifically, when the first gas source 11 is a high-pressure gas source, when connected to a gas pipe or other gas transmission components, the released high-pressure gas is likely to cause damage to the operator. Therefore, by providing the second gas circuit switch 13 between the first gas source 11 and the first adjustable gas resistor 12, the operator can be protected from being harmed by uncontrolled high-pressure gas. It is understandable that when performing a leak test, the second gas circuit switch 13 is in a closed state to achieve gas circuit connection.

[0059] In an example embodiment, reference Figure 1 As shown, the first adjustable gas resistance 12 may include a first pressure reducing valve 121 and a second pressure reducing valve 122, wherein one end of the first pressure reducing valve 121 is connected to the first gas source, and is used to reduce the pressure of the gas output by the first gas source to a preset range to obtain reduced-pressure gas; one end of the second pressure reducing valve 122 is connected to the first pressure reducing valve 121, and the other end is connected to the gas circuit switching switch 3, and is used to adjust the pressure of the reduced-pressure gas to obtain low-pressure gas.

[0060] The pressure reducing valve may refer to a component that can reduce the pressure of the gas entering the valve body. Specifically, when the first gas source 11 is a high-pressure gas source, the pressure of the gas output by the first gas source 11 may be roughly adjusted through the first pressure reducing valve 121 to reduce it to a preset range to obtain reduced-pressure gas. For example, the preset range may be 11Kpa to 16Kpa. Then, the reduced-pressure gas is fine-tuned through the second pressure reducing valve 122 so that the pressure of the reduced-pressure gas meets the pressure required for the leakage test. Through the adjustment of the two pressure reducing valves, the pressure range of the low-pressure gas can be accurately controlled to provide a stable low-pressure gas source for subsequent leakage tests, thereby improving the stability and accuracy of the test.

[0061] In an exemplary embodiment, the automatic configuration gas source supply assembly 2 may further include a gas container 23 , which may be disposed between the second gas source 21 and the second adjustable gas resistor 22 to stabilize the pressure of the gas output by the second gas source 21 .

[0062] The gas container 23 may represent a gas chamber capable of storing or releasing gas. During the leakage detection process, the gas outputted by the second gas source 21 often has unstable airflow. By setting the gas container 23, the unstable low-pressure gas outputted by the second gas source 21 can be converted into stable low-pressure gas, so that the gas in the air pipe can flow stably, thereby improving the reliability of the leakage test.

[0063] In an example embodiment, reference Figure 1As shown, the second adjustable gas resistor 22 may include a pre-gas resistor 221 and a needle valve 222, wherein one end of the pre-gas resistor 221 is connected to the second gas source 21, and is used to initially adjust the pressure of the gas output by the second gas source 21 to obtain the preliminarily adjusted gas; one end of the needle valve 222 is connected to the pre-gas resistor 221, and the other end is connected to the gas path switching switch 3, and is used to fine-tune the pressure of the preliminarily adjusted gas to obtain low-pressure gas. Through the step-by-step adjustment of the pre-gas resistor 221 and the needle valve 222, the adjusted low-pressure gas can be made more stable, thereby improving the stability of the leakage test process of the test piece.

[0064] Among them, the pre-gas resistor 221 can represent a component that can adjust the pressure of the gas flowing through, and the pressure of the gas output by the second gas source 21 can be preliminarily adjusted through the pre-gas resistor 221. The needle valve 222 can represent a component that can accurately adjust the pressure and flow of the gas. Specifically, the needle valve 222 can be composed of a valve body, a valve seat and a valve core, wherein the valve core is a slender needle-shaped component that can move in the valve seat, and the flow and pressure of the gas can be controlled by adjusting the position of the valve core. Due to the linear motion characteristics of the needle valve valve core, very precise flow and pressure control can be achieved, so that the pressure of the gas output by the second gas source 21 can be accurately adjusted, so that the gas output by the second gas source 21 matches the pressure of the gas required for the leak test, thereby improving the accuracy of the leak test process. In addition, since the needle valve adopts the matching form of a conical valve core and a valve seat, a good seal can be achieved when the valve is closed, thereby improving the airtightness of the entire gas circuit and further improving the accuracy of the low-pressure leak test process.

[0065] In an exemplary embodiment, the air inlet pipe 5 includes a low-pressure air source output port 51, which is located at one end of the air inlet pipe 5 away from the air path switch 3, and the test piece 8 and the low-pressure air source output port 51 are closed and connected through a first quick-insert tube. The first quick-insert tube can make the connection operation between the test piece 8 and the low-pressure air source output port 51 simple and quick, and can realize the rapid opening and closing of the air path, thereby improving the efficiency of the leakage test.

[0066] In an exemplary embodiment, the air outlet pipe 6 includes a low-pressure air source detection port 61, which is located at one end of the air outlet pipe 6 close to the pressure gauge 4, and the test piece 8 and the low-pressure air source detection port 61 are closed and connected through a second quick-insert tube. The second quick-insert tube can make the connection operation between the test piece 8 and the low-pressure air source detection port 61 simple and quick, and can realize the rapid opening and closing of the air circuit, thereby improving the efficiency of the leakage test.

[0067] In an exemplary embodiment, when the test is self-sealing, the test piece 8 is connected to the air inlet pipe 5 and the air outlet pipe 6 respectively through a tee. The tee may represent a pipe element with three open ports. During the leakage test, one end of the tee is closed and connected to the test piece 8, one end is closed and connected to the air inlet pipe 5, and one end is closed and connected to the air outlet pipe 6. Through the tee, the test piece can be quickly connected to the air inlet pipe 5 and the air outlet pipe 6 while ensuring the sealing of the entire air path.

[0068] It should be understood that the present invention does not limit its application to the detailed structure and arrangement of the components proposed by the present invention. The present invention can have other embodiments and can be implemented and executed in a variety of ways. The aforementioned variations and modifications fall within the scope of the present invention. It should be understood that the present invention disclosed and defined by the present invention extends to all alternative combinations of two or more individual features mentioned or apparent in the text and / or the accompanying drawings. All these different combinations constitute multiple alternative aspects of the present invention. The embodiments of the present invention illustrate the best mode known for implementing the present invention and will enable those skilled in the art to utilize the present invention.

Claims

1. A leak testing device, It is characterized in that include: A manually adjustable air source supply assembly includes a first air source and a first adjustable air resistance; Automatically configure the gas source supply assembly, including a second gas source and a second adjustable gas resistance; An air circuit switch, one end of which is connected to the air inlet pipe, for realizing a switchable connection between the air inlet pipe and the manually adjustable air source supply component or the automatically configured air source supply component; A pressure gauge for monitoring the pressure of the low-pressure gas output by the manually adjustable gas source supply assembly and the automatically configured gas source supply assembly; An air inlet pipe, one end of which is connected to the air path switch, and the other end of which is connected to the test piece; An air outlet pipe, one end of which is connected to the test piece, and the other end of which is connected to the pressure gauge; a flow meter connected to the air inlet pipe, disposed between the air path switch and the test piece, and used for performing a leakage test on a closed air path formed by the manually adjusted air source supply assembly, the automatically configured air source supply assembly, the air inlet pipe, the air outlet pipe and the test piece; The first adjustable gas resistance is used to adjust the pressure of the gas output by the first gas source, and the second adjustable gas resistance is used to adjust the pressure of the gas output by the second gas source, so that the pressure of the low-pressure gas meets the pressure of the gas required for the leakage test.

2. The leak testing device according to claim 1, It is characterized in that Also includes: A first gas circuit switch is connected in parallel with the test piece, one end of which is connected to the air inlet pipe and the other end of which is connected to the air outlet pipe; Wherein, when the gas circuit switching switch and the first gas circuit switch are closed, the flow meter is used to perform a self-leakage test on the leakage testing device.

3. The leak testing device according to claim 1, It is characterized in that The manually adjusted gas source supply assembly also includes: The second gas circuit switch is arranged between the first gas source and the first adjustable gas resistor, and is used for connecting or disconnecting the first gas source and the first adjustable gas resistor.

4. The leak testing device according to claim 1, It is characterized in that The first adjustable air resistance comprises: A first pressure reducing valve, one end of which is connected to the first gas source, and is used to reduce the pressure of the gas output by the first gas source to a preset range to obtain reduced-pressure gas; The second pressure reducing valve has one end connected to the first pressure reducing valve and the other end connected to the gas path switching switch, and is used to adjust the pressure of the reduced pressure gas to obtain the low-pressure gas.

5. The leakage testing device according to claim 1, It is characterized in that The automatic configuration gas source supply component also includes: The gas container is arranged between the second gas source and the second adjustable gas resistance, and is used to stabilize the pressure of the gas output by the second gas source.

6. The leak testing device according to claim 1, It is characterized in that The second adjustable air resistance comprises: A front gas resistor, one end of which is connected to the second gas source, and is used to initially adjust the pressure of the gas output by the second gas source to obtain initially adjusted gas; A needle valve, one end of which is connected to the front air resistance and the other end of which is connected to the gas path switching switch, is used to fine-tune the pressure of the initially adjusted gas to obtain the low-pressure gas.

7. The leak testing device according to claim 1, It is characterized in that The air intake pipe comprises: The low-pressure gas source output port is located at one end of the air inlet pipe away from the air path switching switch, and the test piece and the low-pressure gas source output port are closed and connected via a first quick-insert tube.

8. The leak testing device according to claim 1, It is characterized in that The air outlet pipe comprises: The low-pressure gas source detection port is located at one end of the gas outlet pipe close to the pressure gauge, and the test piece and the low-pressure gas source detection port are closed and connected through a second quick-insert tube.

9. The leak testing device according to claim 1, It is characterized in that When the test is self-sealing, the test piece is connected to the air inlet pipe and the air outlet pipe respectively through a three-way pipe.

10. The leak testing device according to claim 1, It is characterized in that The first gas source is a portable high-pressure gas source, and the second gas source is an air pump.

Images