An air tightness detection device

Abstract

The utility model provides a kind of air-tightness detection device, it is related to waterway air-tightness detection technical field.The device includes installation cylinder, connecting pipe and elastic sealing element, installation cylinder has internal passage for inputting detection gas to measured area, connecting pipe is slidably connected with installation cylinder, elastic sealing element, it is sleeved in connecting pipe, when connecting pipe slides to first preset position along axial direction, connecting pipe drives elastic sealing element to extrude at the end surface of installation cylinder, elastic sealing element can expand along radial direction, to seal measured area.The device can quickly complete sealing effect without complex operation, significantly shorten detection time, meet the demand of on-site rapid detection, the sealing structure can effectively compensate the size tolerance and surface roughness deviation of waterway interface, avoid the leakage problem caused by the cooperation gap of traditional rigid sealing element, meet the reliability of sealing while structure is simpler, operation is more convenient, and structure cost is lower.

Description

Technical Field

[0001] This invention relates to the field of waterway airtightness detection technology, and in particular to an airtightness detection device. Background Technology

[0002] With the increasing popularity of electric vehicles, the reliability of the electric drive system, as a core power component, is paramount. In equipment maintenance, the sealing test of the water channels in the electric drive system is a crucial step. Current technologies for airtightness testing of electric drive system water channels suffer from the following problems: traditional testing devices rely on replacing the entire electric drive system or complex external equipment, leading to high maintenance costs; existing sealing structures are mostly single sealing rings or threaded connections, which are difficult to adapt to dimensional deviations at the water channel interfaces, easily causing leaks and affecting testing accuracy; some testing devices require external power or rely on specialized tools for disassembly and assembly, making them unsuitable for rapid on-site testing.

[0003] Therefore, there is an urgent need for a waterway airtightness testing device that is simple in structure, reliable in sealing, and suitable for subsequent maintenance scenarios. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide an airtightness detection device to solve the related problems in the prior art.

[0005] To achieve the above and other related objectives, this utility model provides an airtightness detection device, comprising:

[0006] Mounting cylinder;

[0007] The connecting tube has an internal channel for inputting detection gas into the area to be measured, and the connecting tube is slidably connected to the mounting cylinder;

[0008] An elastic seal is fitted onto the connecting pipe;

[0009] When the connecting pipe slides axially to a first preset position, the connecting pipe causes the elastic seal to be pressed against the end face of the mounting cylinder, and the elastic seal can expand radially to seal the tested area.

[0010] Optionally, the connecting pipe includes at least a press-fit protrusion section and an installation section;

[0011] The mounting section passes through and slides on the mounting cylinder, and the pressing protrusion is located at the end of the mounting section away from the mounting cylinder;

[0012] The elastic sealing element is sleeved on the mounting section and is located between the pressing protrusion section and the end face of the mounting cylinder;

[0013] When the connecting pipe slides to the first preset position along the axial direction, the distance between the pressing protrusion and the end face of the mounting cylinder is the first spacing. The elastic seal can be squeezed by the end face of the mounting cylinder and the pressing protrusion at the same time and expand in the radial direction to seal the measured area.

[0014] Optionally, a first gasket is provided between the end face of the elastic seal and the mounting cylinder, and the first gasket is circumferentially sleeved on the connecting pipe.

[0015] Optionally, a second gasket is also included, which is circumferentially sleeved on the connecting pipe and located between the press-fit protrusion and the elastic seal.

[0016] Optional components also include a limit adjustment assembly, a spring, and an intake sleeve;

[0017] The air intake sleeve is slidably installed in the mounting sleeve and is axially connected to the connecting pipe;

[0018] The spring is disposed on the inner bottom wall of the mounting cylinder, and the bottom of the air intake sleeve is in contact with the spring;

[0019] The limit adjustment component cooperates with the spring to adjust the position of the air intake sleeve in the mounting cylinder.

[0020] Optionally, the limit adjustment assembly includes a fixing pin and an adjusting rod. The fixing pin is fixedly installed on the top of the mounting cylinder, and the adjusting rod is rotatably installed on the fixing pin. When the adjusting rod rotates, different positions of the adjusting rod contact the air intake sleeve.

[0021] When the outer circumferential surface of the adjusting rod contacts the air intake sleeve, the spring is in a free state and the connecting pipe slides to the first preset position. When the end face of the adjusting rod contacts the air intake sleeve, the spring is in a compressed state and the connecting pipe slides to the second preset position, and the elastic seal is not squeezed.

[0022] Optionally, the air intake sleeve has an air intake channel inside, and the air intake channel is connected to the internal channel.

[0023] Optionally, the mounting cylinder is provided with an air inlet on its upper side, and the air inlet is connected to the air inlet of the air inlet channel.

[0024] Optionally, the air intake sleeve and the connecting pipe are connected by threads.

[0025] Optionally, an annular groove is provided between the air intake sleeve and the connecting pipe, and a sealing ring is embedded in the annular groove.

[0026] As described above, the airtightness detection device of this utility model has at least the following beneficial effects, including but not limited to:

[0027] 1. This utility model discloses an airtightness testing device, wherein an elastic sealing element is sleeved on a connecting pipe. When the connecting pipe moves, the elastic sealing element can expand radially under the compression constraint of the end of the mounting cylinder, which can tightly fit the inner wall of the interface of the water channel being tested to form a sealing structure. An external air pump can be used to fill the water channel being tested through the internal channel of the connecting pipe and observe the subsequent air pressure state to achieve airtightness testing. The sealing effect can be quickly completed without complicated operation, significantly shortening the testing time and meeting the needs of rapid on-site testing. This sealing structure can effectively compensate for the dimensional tolerance and surface roughness deviation of the water channel interface, avoid the leakage problem caused by the fit gap of traditional rigid seals, and meet the requirements of reliable sealing while having a simpler structure, more convenient operation, and lower structural cost.

[0028] 2. The airtightness testing device solves the edge wear problem caused by direct contact and pressure of the protruding section of the elastic seal by setting the combination design of the first gasket and the second gasket, thus extending the service life of the seal. The symmetrical constraint structure formed by the second gasket and the first gasket ensures the controllability of the deformation trajectory of the elastic seal during repeated compression. At the same time, this structure avoids the attenuation of sealing performance caused by uneven deformation of the sealing material while maintaining a uniform distribution of sealing pressure.

[0029] 3. In this airtightness testing device, when the adjusting rod rotates, its outer circumferential surface gradually contacts the outer wall of the air inlet sleeve. At this time, the spring is in a free extension state without axial pressure, pushing the air inlet sleeve to drive the connecting pipe to move axially to the first preset position, so that the elastic seal is fully compressed and expanded to form a seal. When the adjusting rod rotates to the point where its end face contacts the air inlet sleeve, the plane at the end of the rod directly presses the air inlet sleeve to generate axial displacement, causing the spring to compress and store energy. The connecting pipe returns to the second preset position to release the seal. This process can complete the switching between the sealed and non-sealed states through a single rotation action, solving the problem of low adjustment efficiency caused by the reliance on external power or professional tools in traditional devices, and significantly improving the reliability and ease of operation of airtightness testing. Attached Figure Description

[0030] Figure 1 The diagram shown is an overall structural schematic of the airtightness detection device provided in the embodiment of this application.

[0031] Figure 2 The diagram shows the internal structure of the airtightness detection device in the uncompressed state of the elastic seal provided in the embodiment of this application.

[0032] Figure 3The diagram shows the external structure of the airtightness detection device under compressed state of the elastic seal provided in the embodiment of this application.

[0033] Figure 4 The diagram shows the internal structure of the airtightness detection device under the compressed state of the elastic seal provided in the embodiment of this application.

[0034] Figure 5 The diagram shows the integration of the airtightness testing device provided in the embodiment of this application into the waterway being tested.

[0035] Icons: 1. Mounting cylinder, 2. Connecting pipe, 201. Internal channel, 202. Press-fit protrusion section, 203. Mounting section, 3. Elastic seal, 4. First gasket, 5. Second gasket, 6. Limit adjustment assembly, 601. Fixing pin, 602. Adjusting rod, 7. Spring, 8. Air inlet sleeve, 801. Air inlet channel, 802. Air inlet opening, 9. Sealing ring, 10. Test water channel. Detailed Implementation

[0036] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0037] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0038] Please refer to Figures 1-4 This application discloses an airtightness detection device, including an installation cylinder 1, a connecting pipe 2, and an elastic seal 3. The connecting pipe 2 has an internal channel 201 for inputting detection gas into the area to be tested, and the connecting pipe 2 is slidably connected to the installation cylinder 1. The elastic seal 3 is sleeved on the connecting pipe 2. When the connecting pipe 2 slides to a first preset position in the axial direction, the connecting pipe 2 drives the elastic seal 3 to be squeezed at the end face of the installation cylinder 1, and the elastic seal 3 can expand in the radial direction to seal the area to be tested.

[0039] It is worth noting that in this utility model, the elastic sealing element 3 is sleeved on the connecting pipe 2. When the connecting pipe 2 moves, the elastic sealing element 3 can expand radially under the compression constraint of the end of the mounting cylinder 1, which can tightly fit the inner wall or end face of the interface of the water channel 10 under test to form a sealing structure. An external air pump can be used to inject test gas into the water channel 10 under test through the internal channel 201 of the connecting pipe 2, and the subsequent air pressure state can be observed to achieve airtightness testing. The sealing effect can be quickly achieved without complicated operations, significantly shortening the testing time and meeting the needs of rapid on-site testing. This sealing structure can effectively compensate for the dimensional tolerances and surface roughness deviations of the water channel interface, avoiding the leakage problems caused by the fit gap of traditional rigid seals. While ensuring reliable sealing, the structure is simpler, easier to operate, and has a lower structural cost. Figure 5 As shown, when the device is in operation, the elastic seal 3 and the inlet of the water channel 10 under test are in contact to form a sealing structure. At this time, gas is introduced into the water channel 10 under test through the air pump and the pressure is maintained for 30 seconds. If the pressure of the air pump can be maintained, the air tightness of the water channel 10 under test is qualified.

[0040] Please refer to Figure 2 and Figure 4 The connecting pipe 2 includes at least a pressing protrusion section 202 and an installation section 203; the installation section 203 passes through and is slidably installed on the installation cylinder 1, and the pressing protrusion section 202 is located at the end of the installation section 203 away from the installation cylinder 1; the elastic seal 3 is sleeved on the installation section 203 and is located between the pressing protrusion section 202 and the end face of the installation cylinder 1; when the connecting pipe 2 slides to a first preset position in the axial direction, the distance between the pressing protrusion section 202 and the end face of the installation cylinder 1 is a first gap, and the elastic seal 3 can be simultaneously squeezed by the end face of the installation cylinder 1 and the pressing protrusion section 202 and expand in the radial direction to seal the measured area.

[0041] It should be noted that the pressing protrusion 202 is a ring-shaped protrusion structure at the end of the connecting pipe 2, which can be implemented using a stepped shaft or flange structure, and is used to provide a force-applying surface for the elastic seal 3 during axial movement. The mounting section 203 refers to the portion of the connecting pipe 2 with a diameter smaller than the pressing protrusion 202, which can be implemented using a cylindrical rod structure, and its outer surface slides with the mounting cylinder 1 to transmit axial displacement. The first gap refers to the distance between the pressing protrusion 202 and the end face of the mounting cylinder 1 when the connecting pipe 2 slides to a preset position, which can be controlled by adjusting the stroke of the connecting pipe 2 or the limiting structure, and its size is smaller than the original thickness of the elastic seal 3 to form a compression space.

[0042] It is worth noting that the sliding fit between the mounting section 203 and the mounting cylinder 1 allows the connecting pipe 2 to move along the axis under external force. When the connecting pipe 2 is pushed into the first preset position, the pressing protrusion 202 moves synchronously towards the end face of the mounting cylinder 1 along with the mounting section 203. At this time, the elastic seal 3 is confined within the gap between the pressing protrusion 202 and the end face of the mounting cylinder 1. Due to the constraint of the first gap, the elastic seal 3 is subjected to bidirectional compression in the axial direction, and its internal stress forces the material to expand radially, forming a tight fit with the contact surface of the measured area. The stepped structure design of the pressing protrusion 202 increases the contact area with the elastic seal 3, making the compressive force distribution more uniform and avoiding sealing failure caused by local stress concentration. Compared with the prior art, the bidirectional synchronous compression of the pressing protrusion 202 and the end face of the mounting cylinder 1 in this application enables the elastic seal 3 to expand uniformly in the radial direction, effectively compensating for the processing tolerance or installation error of the interface of the measured area and simplifying the assembly process of the testing device. This application enables controllable deformation of the elastic seal 3 within a confined space, allowing the sealing interface to adapt to interfaces of different sizes, thus improving the versatility of the detection device and the reliability of the seal. The stepped structure design of the pressing protrusion 202 further optimizes the transmission path of the extrusion force, ensuring that the seal does not deflect or twist during axial displacement, thereby maintaining stable sealing performance.

[0043] Please refer to Figures 1-4 A first gasket 4 is provided between the end faces of the elastic seal 3 and the mounting cylinder 1, and the first gasket 4 is circumferentially sleeved on the connecting pipe 2.

[0044] The first gasket 4 is an annular structure positioned between the elastic seal 3 and the rigid end face of the mounting cylinder 1, with its inner diameter matching the outer diameter of the connecting pipe 2. The first gasket 4 increases the stress area of ​​the elastic seal 3 under axial compression. Specifically, the first gasket 4 forms a closed annular structure around the axis of the connecting pipe 2, ensuring it remains concentric with the seal under pressure and preventing uneven sealing caused by deflection. When the connecting pipe 2 slides to the first gap position formed by the pressing protrusion 202 and the end face of the mounting cylinder 1, the first gasket 4 is clamped between the elastic seal 3 and the end face of the mounting cylinder 1. The first gasket 4 converts the axial pressure transmitted by the pressing protrusion 202 into a uniformly distributed radial expansion force, eliminating frictional losses caused by direct contact between the elastic seal 3 and the end face of the mounting cylinder. During repeated compression, the first gasket 4 acts as a transition medium between the rigid end face and the elastic body, absorbing local stress peaks through its own deformation and maintaining pressure balance at the sealing interface. Compared with existing technologies, this solution improves multi-point contact to surface contact by introducing an intermediate buffer layer, making the sealing pressure distribution more consistent with the mechanical properties of the elastomer material. This solution improves interface stability without changing the size of the seal. In this embodiment, the first gasket 4 is disposed between the elastic seal 3 and the rigid end face of the mounting cylinder 1, while the pressing protrusion 202 also acts as a gasket at the other end. In this embodiment, the pressing protrusion 202 and the first gasket 4 cooperate to compress and deform the elastic seal 3.

[0045] Please refer to Figures 1-4 It also includes a second gasket 5, which is circumferentially sleeved on the connecting pipe 2 and located between the press-fit protrusion 202 and the elastic seal 3.

[0046] It should be noted that the inner diameter of the second gasket 5 matches the outer diameter of the connecting pipe 2 to achieve circumferential fitting. During axial compression, this gasket acts as a pressure transmission medium, converting the concentrated load of the pressing protrusion 202 into a surface load acting on the elastic seal 3. Specifically, when the connecting pipe 2 slides to the first preset position, the pressing protrusion 202 applies axial pressure to the elastic seal 3 through the second gasket 5. The contact area between the second gasket 5 and the elastic seal 3 is larger than the contact area when the pressing protrusion 202 directly contacts the elastic seal 3, significantly reducing the pressure on the elastic seal 3 during axial compression. Simultaneously, the second gasket 5 and the first gasket 4 together form a symmetrical clamping structure, creating parallel pressing surfaces on both sides of the elastic seal 3, preventing non-uniform deformation of the elastic seal 3 due to unilateral pressure. This structure controls the radial expansion of the elastic seal 3 within the constraint boundaries of the gaskets on both sides, maintaining stable deformation recovery capability during multiple compression cycles.

[0047] It is worth noting that the combined design of the first gasket 4 and the second gasket 5 solves the edge wear problem caused by direct contact with the pressing protrusion 202 of the elastic seal 3, thus extending the service life of the seal. The symmetrical constraint structure formed by the second gasket 5 and the first gasket 4 ensures the controllability of the deformation trajectory of the elastic seal 3 during repeated compression. At the same time, this structure avoids the attenuation of sealing performance caused by uneven deformation of the sealing material while maintaining a uniform distribution of sealing pressure. In this embodiment, the pressing protrusion 202 works together with the first gasket 4 and the second gasket 5 to compress and deform the elastic seal 3.

[0048] Please refer to Figures 2-4 It also includes a limit adjustment component 6, a spring 7, and an air intake sleeve 8; the air intake sleeve 8 is slidably installed in the mounting cylinder 1 and axially connected to the connecting pipe 2; the spring 7 is disposed on the inner bottom wall of the mounting cylinder 1, and the bottom of the air intake sleeve 8 contacts the spring 7; the limit adjustment component 6 cooperates with the spring 7 to adjust the position of the air intake sleeve 8 in the mounting cylinder 1.

[0049] The limit adjustment component 6 controls the axial movement of the air intake sleeve 8. The spring 7 can be a stainless steel compression spring, used to buffer displacement impact and generate a reset driving force. The air intake sleeve 8 can be an aluminum alloy cylinder with an internal through hole, used to achieve axial linkage between the connecting pipe 2 and the mounting cylinder 1. Specifically, the air intake sleeve 8 forms a synchronously moving body through its rigid axial connection with the connecting pipe 2, constituting an axial sliding pair within the mounting cylinder 1. The spring 7 is compressed between the bottom of the mounting cylinder 1 and the end face of the air intake sleeve 8, with its elastic force acting in the same direction as the sliding direction of the air intake sleeve 8. The limit adjustment component 6, through its interaction with the spring 7, mechanically locks the axial position of the air intake sleeve 8. When it is necessary to change the working position of the connecting pipe 2, the limit adjustment component 6 is operated to change its contact position with the air intake sleeve 8, thereby compressing or releasing the deformation of the spring 7, ultimately achieving the switching of the connecting pipe 2 between a first preset position and a second preset position along the axial direction within the mounting cylinder 1. The detection mode switching can be completed without the aid of external power equipment. By adjusting the position of the limit adjustment component 6, the operator can control whether the elastic seal 3 enters the radial expansion sealing state, solving the problem of frequent disassembly and assembly required by traditional devices. The elastic support of the spring 7 can automatically compensate for the deviation of the axial displacement of the connecting pipe 2, ensuring the stability of the sealing pressure.

[0050] Please refer to Figures 2-4The limiting adjustment assembly 6 includes a fixing pin 601 and an adjusting rod 602. The fixing pin 601 is fixedly installed on the top of the mounting cylinder 1, and the adjusting rod 602 is rotatably installed on the fixing pin 601. When the adjusting rod 602 rotates, different positions of the adjusting rod 602 contact the air intake sleeve 8. When the outer circumferential surface of the adjusting rod 602 contacts the air intake sleeve 8, the spring 7 is in a free state, and the connecting pipe 2 slides to a first preset position. When the end face of the adjusting rod 602 contacts the air intake sleeve 8, the spring 7 is in a compressed state, the connecting pipe 2 slides to a second preset position, and the elastic seal 3 is not compressed.

[0051] Specifically, when the adjusting rod 602 rotates around the fixed pin 601, its outer circumferential surface gradually contacts the outer wall of the air intake sleeve 8. At this time, the spring 7 is in a free extension state without axial pressure, pushing the air intake sleeve 8 to drive the connecting pipe 2 to move axially to the first preset position, so that the elastic seal 3 is fully compressed and expanded to form a seal. When the adjusting rod 602 rotates to the point where its end face contacts the air intake sleeve 8, the plane of the rod end directly presses the air intake sleeve 8 to generate axial displacement, forcing the spring 7 to compress and store energy. At this time, the connecting pipe 2 returns to the second preset position to release the seal. The adjusting rod 602 rotates around the fixed pin 601. When the adjusting rod 602 rotates to different positions, its outer circumferential surface and end face contact the end of the air intake sleeve 8 respectively. Reflected in the axial direction, the distance from the end face of the adjusting rod to the fixed pin is greater than the distance from the outer circumferential surface of the adjusting rod to the fixed pin, achieving a certain distance difference, thereby realizing the position adjustment of the air intake sleeve 8. This process switches between sealed and unsealed states with a single rotational motion, significantly improving operational efficiency compared to existing technologies by eliminating the need for external power sources. It solves the problem of low adjustment efficiency caused by traditional devices relying on external power or specialized tools. The structure ensures precise control of the seal expansion through mechanical limiting, preventing gas leakage due to dimensional deviations and significantly improving the reliability and ease of operation of airtightness testing.

[0052] In some embodiments, the limit adjustment component 6 may also be selected from other types of linear drive structures to achieve the corresponding function, such as by means of a linear drive mechanism or a pneumatic-hydraulic device, or by means of threaded engagement to achieve linear motion driven by rotational adjustment.

[0053] Please refer to Figure 2 and Figure 4 The air intake sleeve 8 has an air intake channel 801 inside, and the air intake channel 801 is connected to the internal channel 201.

[0054] Among them, the air intake channel 801 is a through-type gas flow channel set inside the air intake sleeve 8. Specifically, it can be realized by forming an axial through hole through machining, and its inner diameter can be designed according to the gas flow requirements.

[0055] Specifically, when the detection gas enters the device through the inlet channel 801, the gas flows directly into the internal channel 201 of the connecting pipe 2, and is then delivered to the measured area through the outlet at the end of the connecting pipe 2. The inlet channel 801 and the internal channel 201 are connected in a through-type manner. The axial connection between the inlet sleeve 8 and the connecting pipe 2 further ensures the continuity of the gas transmission path, maintaining the continuity of the channel during sliding. Reducing the number of interfaces in the gas transmission path effectively reduces the risk of leakage caused by sealing failure at the connection points, thereby ensuring the stability and reliability of the detection gas transmission within the device.

[0056] Please refer to Figure 1 and Figure 3 An air inlet 802 is provided on the upper side of the mounting cylinder 1, and the air inlet 802 is connected to the air inlet of the air inlet channel 801.

[0057] Specifically, the upper side of the mounting cylinder 1 refers to the transition area between the top and side wall of the mounting cylinder 1. This can be achieved by creating a through hole at the top edge of the mounting cylinder 1 to provide an access point for the gas input path. The air inlet 802 connects the interior of the mounting cylinder 1 to the outside environment and is used to directly receive the detection gas. The air inlet of the air inlet channel 801 refers to the starting end inside the air inlet sleeve 8 used to receive the gas. This can be achieved by using a through hole aligned with the axis of the air inlet 802.

[0058] Specifically, the air inlet 802 set above the side of the mounting cylinder 1 forms a connecting channel with the air inlet of the air inlet channel 801. An external air source pipeline can be directly connected to the air inlet 802, and the detection gas enters the air inlet channel 801 along this conduction path.

[0059] In some embodiments, the air intake sleeve 8 and the connecting pipe 2 are connected by threads.

[0060] Specifically, during assembly, the internal thread of the intake sleeve 8 engages with the external thread of the connecting pipe 2, achieving a locking mechanism. When disassembly and maintenance are required, the intake sleeve 8 and connecting pipe 2 can be separated by reverse rotation, without the need for special tools. The axial positioning accuracy of the threaded connection ensures the coaxiality of the intake sleeve 8 and connecting pipe 2, preventing one-sided wear of the sealing ring 9 due to radial misalignment.

[0061] Please refer to Figure 2 and Figure 4 An annular groove is provided between the air intake sleeve 8 and the connecting pipe 2, and a sealing ring 9 is embedded in the annular groove.

[0062] The annular groove is a ring-shaped groove structure machined on the mating surface of the two components, used to provide positioning and installation space for the sealing ring 9. The depth and width of the annular groove must be designed to match the cross-sectional dimensions of the sealing ring 9 to ensure that the sealing ring 9 undergoes radial deformation under pressure but does not detach from the groove. After the sealing ring 9 is embedded in the groove, its outer circumferential surface remains in contact with the inner wall of the connecting pipe 2 or the air inlet sleeve 8, forming a radial sealing interface.

[0063] Specifically, under the pressure of the detected gas, the sealing ring 9 is pushed by the gas pressure to further press against the sidewall of the groove and the mating surface, forming a self-reinforcing sealing effect. The groove structure restricts the axial displacement of the sealing ring 9 during dynamic sliding, preventing seal failure due to vibration or uneven wear. This solves the gas leakage problem at the joint between the air inlet sleeve 8 and the connecting pipe 2. Under the constrained state within the annular groove, the sealing ring 9 prevents the detected gas from leaking out along the mating surface. This sealing structure can maintain a stable sealing pressure even under axial displacement conditions, ensuring the accuracy of gas pressure data during airtightness testing, achieving bidirectional sealing of the device from both inside and outside, and improving the accuracy and reliability of airtightness testing.

[0064] In some embodiments, the resilient seal 3 is made of rubber.

[0065] Rubber material has good elasticity and sealing properties. The elastic seal 3 made from it can better achieve radial expansion sealing function. Moreover, rubber material has low cost and good corrosion resistance, which can reduce equipment cost, extend equipment service life and improve the overall performance of the equipment.

[0066] In summary, this utility model can quickly achieve a sealing effect without complicated operations, significantly shortening the testing time and meeting the needs of rapid on-site testing. This sealing structure can effectively compensate for the dimensional tolerances and surface roughness deviations of the waterway interface, avoiding leakage problems caused by the fit gap of traditional rigid seals. While ensuring reliable sealing performance, it is simpler in structure, more convenient to operate, and has a lower structural cost.

[0067] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

[0068] Throughout this description, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of this application. However, those skilled in the art will recognize that embodiments of this invention may be practiced without one or more of these specific details or by other devices, systems, components, methods, parts, materials, components, etc. In other instances, well-known structures, materials, or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of this application.

[0069] Throughout this specification, references to "an embodiment," "an embodiment," or "a specific embodiment" mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of the present invention, but not necessarily in all embodiments. Therefore, the various representations of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout the specification do not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic of any specific embodiment of the present invention can be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments described herein may be based on the teachings herein and will be considered part of the spirit and scope of the present invention.

[0070] It should also be understood that one or more of the elements shown in the figures may be implemented in a more separate or more integrated manner, or may even be removed because they are inoperable in certain circumstances or provided because they may be useful for a particular application.

[0071] Furthermore, unless otherwise expressly stated, any arrows in the accompanying drawings should be considered illustrative only and not limiting. Additionally, unless otherwise stated, the term "or" as used herein is generally intended to mean "and / or". Where a term is anticipated to provide a separation or combination capability that is unclear, a combination of components or steps will also be considered as indicated.

[0072] As used herein and throughout the claims below, unless otherwise specified, “a” and “the” include the plural references. Similarly, as used herein and throughout the claims below, unless otherwise specified, “in” means “in” and “on”.

[0073] The above description of the embodiments shown in this utility model (including the content in the abstract of the specification) is not intended to be an exhaustive enumeration or to limit the utility model to the precise forms disclosed herein. Although specific embodiments and examples of the utility model have been described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the utility model, as will be recognized and understood by those skilled in the art. As indicated, these modifications can be made to the utility model in accordance with the above description of the embodiments of this application, and such modifications will be within the spirit and scope of the utility model.

[0074] This document has generally described the systems and methods in detail to aid in understanding the present invention. Furthermore, various specific details have been set forth to provide a general understanding of the embodiments of this application. However, those skilled in the art will recognize that embodiments of the present invention can be practiced without one or more specific details, or using other devices, systems, accessories, methods, components, materials, parts, etc. In other instances, well-known structures, materials, and / or operations have not been specifically shown or described in detail to avoid obscuring various aspects of the embodiments of this application.

Claims

1. An airtightness detection device, characterized in that, include: Mounting cylinder; The connecting tube has an internal channel for inputting detection gas into the area to be measured, and the connecting tube is slidably connected to the mounting cylinder; An elastic seal is fitted onto the connecting pipe; When the connecting pipe slides axially to a first preset position, the connecting pipe causes the elastic seal to be pressed against the end face of the mounting cylinder, and the elastic seal can expand radially to seal the tested area.

2. The airtightness detection device according to claim 1, characterized in that: The connecting pipe includes at least a press-fit protrusion section and an installation section; The mounting section passes through and slides on the mounting cylinder, and the pressing protrusion is located at the end of the mounting section away from the mounting cylinder; The elastic sealing element is sleeved on the mounting section and is located between the pressing protrusion section and the end face of the mounting cylinder; When the connecting pipe slides to the first preset position along the axial direction, the distance between the pressing protrusion and the end face of the mounting cylinder is the first spacing. The elastic seal can be squeezed by the end face of the mounting cylinder and the pressing protrusion at the same time and expand in the radial direction to seal the measured area.

3. The airtightness detection device according to claim 2, characterized in that: A first gasket is provided between the end face of the elastic seal and the mounting cylinder, and the first gasket is circumferentially sleeved on the connecting pipe.

4. The airtightness detection device according to claim 3, characterized in that: It also includes a second gasket, which is circumferentially sleeved on the connecting pipe and located between the press-fit protrusion and the elastic seal.

5. The airtightness detection device according to claim 1, characterized in that: It also includes a limit adjustment assembly, a spring, and an intake sleeve; The air intake sleeve is slidably installed in the mounting sleeve and is axially connected to the connecting pipe; The spring is disposed on the inner bottom wall of the mounting cylinder, and the bottom of the air intake sleeve is in contact with the spring; The limit adjustment component cooperates with the spring to adjust the position of the air intake sleeve in the mounting cylinder.

6. The airtightness detection device according to claim 5, characterized in that: The limit adjustment assembly includes a fixing pin and an adjusting rod. The fixing pin is fixedly installed on the top of the mounting cylinder, and the adjusting rod is rotatably installed on the fixing pin. When the adjusting rod rotates, different positions of the adjusting rod contact the air intake sleeve. When the outer circumferential surface of the adjusting rod contacts the air intake sleeve, the spring is in a free state and the connecting pipe slides to the first preset position. When the end face of the adjusting rod contacts the air intake sleeve, the spring is in a compressed state and the connecting pipe slides to the second preset position, and the elastic seal is not squeezed.

7. The airtightness detection device according to claim 5, characterized in that: The air intake sleeve has an air intake channel inside, and the air intake channel is connected to the internal channel.

8. The airtightness detection device according to claim 7, characterized in that: An air inlet is provided on the upper side of the mounting cylinder, and the air inlet is connected to the air inlet of the air intake channel.

9. The airtightness detection device according to claim 5, characterized in that: The air intake sleeve and the connecting pipe are connected by threads.

10. The airtightness detection device according to claim 5, characterized in that: An annular groove is provided between the air intake sleeve and the connecting pipe, and a sealing ring is embedded in the annular groove.

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