Sealing structure and air tightness detection device

Abstract

The utility model relates to the technical field of air tightness detection, in particular to a sealing structure and an air tightness detection device.The sealing structure is applied to the air tightness detection device.The sealing structure is used for blocking an opening of a workpiece to be detected and comprises a sealing ring, the first extrusion element and the second extrusion element are arranged on the two sides of the sealing ring respectively, and the first extrusion element and the second extrusion element are oppositely arranged in an opening and closing mode. An anti-skid structure is arranged on the side, attached to the sealing ring, of the first extrusion element and / or the second extrusion element. The sealing structure provided by the utility model can seal the inner wall of the opening part of the workpiece to be detected and improve the sealing performance, thereby improving the accuracy of detecting the airtightness of the workpiece by the airtightness detection device.

Description

Technical Field

[0001] The utility model relates to the technical field of air tightness detection, in particular to a sealing structure and an air tightness detection device. Background Art

[0002] Typically, the sealing element is larger than the inner diameter of the workpiece port. For example, simply plugging the workpiece port with a rubber sheet can achieve a seal, and the shape and size of the rubber sheet are not critical. However, for some special workpieces, sealing must be performed from the inside. For example, if the workpiece port is notched or uneven, simply plugging it with the large surface of the rubber sheet may not be able to achieve an effective seal.

[0003] When using a sealing ring to seal the interior of a test tube, if the outer diameter of the ring is larger than the inner diameter of the tube, the ring will be difficult to fit into the tube. Conversely, if the outer diameter of the ring is equal to or smaller than the inner diameter of the tube, while it can fit into the tube, it may not provide a high-quality seal inside the tube's end. Therefore, improving the sealing performance of the inner side of the test workpiece's end is a technical problem to be solved in this case. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a sealing structure and an airtightness detection device; the sealing structure can seal the inner side of the mouth of the workpiece to be tested and can improve the sealing performance, thereby improving the accuracy of the airtightness detection device in detecting the airtightness of the workpiece.

[0005] In order to achieve the above-mentioned and other related purposes, the present invention provides a sealing structure, which is applied to an airtightness detection device, and the sealing structure is used to seal the mouth of a workpiece to be tested;

[0006] The sealing structure includes a sealing ring, and a first extrusion element and a second extrusion element respectively arranged on both sides of the sealing ring, wherein the first extrusion element and the second extrusion element are arranged to open and close relative to each other; an anti-slip structure is provided on the side of the first extrusion element and / or the second extrusion element that is in contact with the sealing ring.

[0007] In an optional embodiment of the present invention, the anti-slip structure includes a plurality of evenly arranged conical structures with one end being larger and the other end being smaller, and the small end of the conical structure is arranged toward the sealing ring.

[0008] In an optional embodiment of the present invention, the two groups of tapered structures respectively provided on the first extrusion element and the second extrusion element are non-aligned.

[0009] In an optional embodiment of the present invention, the first extrusion element is a sleeve-shaped structure having a mounting end and a limiting end;

[0010] The second extrusion element is a rod-shaped structure having a sliding end and an extrusion end, and the sliding end slides into the sleeve-shaped limiting end; the diameter of the extrusion end is larger than the inner diameter of the limiting end;

[0011] The sealing ring is sleeved on the second extrusion element and is limited between the extrusion end and the limiting end.

[0012] In an optional embodiment of the present invention, a first telescopic drive member is provided near the mounting end and is fixed relative to the mounting end. The first telescopic drive member includes a first telescopic rod arranged along the axial direction of the second extrusion element, and the telescopic rod is connected to the sliding end.

[0013] In an optional embodiment of the present invention, an extension rod is further provided between the telescopic rod and the sliding end, one end of the extension rod is connected to the telescopic rod, and the other end of the extension rod is connected to the sliding end.

[0014] The utility model provides an airtightness detection device, comprising the sealing structure.

[0015] In an optional embodiment of the present invention, the airtightness detection device includes:

[0016] base;

[0017] A first support seat is provided on the base;

[0018] The first telescopic driving member is arranged on the base, and the mounting end is vertically mounted on one side of the first supporting seat. One end of the first telescopic rod can be telescopically extended through the first supporting seat and detachably connected to the sliding end.

[0019] In an optional embodiment of the present utility model, a second telescopic driving member is further provided on the base;

[0020] The second telescopic driving member includes a second telescopic rod having the same axial direction as the corresponding end of the workpiece to be measured,

[0021] A blocking component for blocking the outside of the port of the workpiece to be measured is provided at one end of the second telescopic rod close to the first supporting seat.

[0022] In an optional embodiment of the present invention, the blocking component and / or the sealing structure is provided with an air inlet for inflating air into the workpiece to be measured.

[0023] The technical effect of the present invention is that the friction coefficient of the contact surface with the sealing ring is increased by the anti-slip structure on the first extrusion element and / or the second extrusion element, which helps to prevent the sealing ring from sliding when squeezed, thereby avoiding or reducing the risk of being pulled through; at the same time, the design of the anti-slip structure helps to distribute the extrusion force more evenly on the entire contact surface of the sealing ring, so that the first extrusion element and the second extrusion element can evenly squeeze the corresponding contact surface of the sealing ring, thereby allowing the sealing ring to deform and expand evenly, thereby achieving a more even fit between the outer contour of the sealing ring and the inner wall of the workpiece to be measured to achieve a higher quality seal, thereby improving the accuracy of the airtightness detection of the workpiece to be measured. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural schematic diagram of the sealing structure in an optional embodiment of the present invention sealing the opening of the workpiece to be measured;

[0025] Figure 2 This is a schematic structural diagram of a workpiece to be measured in an optional embodiment of the present utility model;

[0026] Figure 3 This is a schematic structural diagram of the first extrusion element in an optional embodiment of the present utility model;

[0027] Figure 4 for Figure 3 A magnified view of the structure at point A;

[0028] Figure 5 This is a schematic diagram of the sealing ring structure in an optional embodiment of the present utility model;

[0029] Figure 6 This is a structural schematic diagram of the second extrusion unit in an optional embodiment of the present utility model;

[0030] Figure 7 This is a schematic structural diagram of the air tightness detection device before improvement of the utility model;

[0031] Figure 8 This is a schematic structural diagram of an airtightness detection device in an optional embodiment of the present utility model;

[0032] Figure 9 for Figure 8 Structural cross-sectional view at AA;

[0033] Figure numerals: workpiece to be tested 100, airtightness detection device 200, sealing ring 1, first extrusion element 2, mounting end 21, limiting end 22, second extrusion element 3, sliding end 31, extrusion end 32, anti-slip structure 4, first telescopic drive member 5, first telescopic rod 51, screw 511, extension rod 52, base 6, first support seat 61, second support seat 62, second telescopic drive member 63, second telescopic rod 631, blocking assembly 7, air inlet 8. DETAILED DESCRIPTION

[0034] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different perspectives and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features within these embodiments may be combined with one another, unless they conflict.

[0035] It should be noted that the following examples provide Figure 1-9 The figure is only used to illustrate the basic concept of the present invention in a schematic manner. Therefore, the figure only shows the components related to the present invention and is not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout may also be more complicated.

[0036] like Figure 7The figure shows the airtightness detection device before the improvement of this case. It should be made clear that the device only represents the design before the improvement of this case, and does not mean that it is the existing technical level. When checking whether the sealing performance of the workpiece 100 to be tested meets the standards and whether there are small cracks or holes, the usual practice is to use a special airtightness detection device 200. The detection process involves installing the workpiece 100 to be tested that has been processed and assembled onto the airtightness detection device 200, using a sealing element to seal the port of the workpiece 100 to be tested, and then setting a predetermined ventilation volume and inflating the interior of the workpiece 100 to be tested to maintain the air pressure stable within a specified time. Generally speaking, the airtightness detection device 200 is equipped with components for detecting air leaks, such as a leak detector, which are electronically connected to an alarm and a signal light through a controller. If the alarm does not sound an alarm during the pressure holding period and displays a green light signal indicating that it is qualified, it can be determined that the sealing performance of the workpiece 100 to be tested is qualified. Before performing a leak test, ensure that the interface between the airtightness testing device 200 and the workpiece 100 is properly matched to avoid mismatched interfaces and incorrect judgments. The dwell time should be determined based on the size and material properties of the workpiece 100, as well as the expected operating environment, to ensure test sensitivity and accuracy.

[0037] like Figure 2 As shown, in this case, the workpiece 100 to be tested is taken as an example of a tube to be tested, for example, the tube to be tested can be an automobile exhaust connecting pipe; it should be understood that the workpiece 100 to be tested can also be a kettle with a water outlet and a water inlet or a plastic water cup with a port or other workpieces to be tested 100, and the ports at the inlet and outlet ends of the workpiece 100 to be tested can be circular or elliptical or other shapes.

[0038] like Figure 1 As shown, the utility model provides a sealing structure, which is applied to an airtightness detection device 200, and the sealing structure is used to seal the inner side of the mouth of the workpiece 100 to be tested; it should be understood that the airtightness detection device 200 can also include other structures and test units, for example, it can also include sensors and alarms for detecting whether there is leakage, for example, it can also include pipelines for gas supply and some mounting brackets, etc. Since the main innovation of this case is not this, this case will not be discussed in detail, and the following will be explained in detail using the pipe body to be tested as an example.

[0039] The sealing structure includes a sealing ring 1, and a first extrusion element 2 and a second extrusion element 3 respectively disposed on both sides of the sealing ring 1, wherein the first extrusion element 2 and the second extrusion element 3 are arranged to open and close relative to each other; an anti-slip structure 4 is provided on the side of the first extrusion element 2 and / or the second extrusion element 3 that is in contact with the sealing ring 1, and the sealing structure is used to be inserted into the inner side of one end of the tube body to be tested. It should be understood that the size of the structural portion of the sealing structure inserted into the tube body to be tested is less than or equal to the corresponding size of the tube body to be tested, as long as the sealing structure can match and seal the corresponding mouth of the tube body to be tested; wherein, the material of the sealing ring 1 should have good compression resilience, creep and stress relaxation properties, such as a soft rubber material, and the outer contour of the sealing ring 1 matches the inner wall of the tube body to be tested; it should be understood that the first extrusion element 2 and the second extrusion element 3 can be matched with the outer contour size of the sealing ring 1, so that the sealing ring 1 can be squeezed and deformed more evenly.

[0040] During use, when the sealing structure is inserted into the mouth of the tube to be tested, the first extrusion element 2 and the second extrusion element 3 are brought close to each other and squeeze the sealing ring 1, so that the sealing ring 1 expands to the inner wall of the tube to be tested, thereby achieving the purpose of sealing the inner wall of the tube to be tested. However, the sealing ring 1 is generally small. When the first extrusion element 2 and the second extrusion element 3 squeeze the sealing ring 1, it is easy for the first extrusion element 2 or the second extrusion element 3 to be pulled directly through the middle hole of the soft sealing ring 1, so that the sealing ring 1 cannot expand evenly or expands irregularly or a local area cannot expand, thereby causing the port seal of the tube to be tested to fail, and thus it is impossible to effectively perform leak detection. A qualified workpiece 100 to be tested may also be tested as unqualified. In addition, sometimes, after a local area of ​​the sealing ring 1 is pulled through, when the first extrusion element 2 and the second extrusion element 3 move away from each other, the sealing ring 1 returns to its original shape, making this problem difficult to detect. Therefore, making the sealing ring 1 expand evenly is the key to solving the port sealing problem of the workpiece 100 to be tested.

[0041] In this case, the friction coefficient of the contact surface with the sealing ring 1 is increased by the anti-slip structure 4 on the first extrusion element 2 and / or the second extrusion element 3, which helps to prevent the sealing ring 1 from sliding when squeezed, thereby avoiding or reducing the risk of being pulled through; at the same time, the design of the anti-slip structure 4 helps to distribute the extrusion force more evenly on the entire contact surface of the sealing ring 1, so that the first extrusion element 2 and the second extrusion element 3 can evenly squeeze the corresponding contact surfaces of the sealing ring 1, thereby allowing the sealing ring 1 to deform and expand evenly, thereby achieving a more even fit between the outer contour of the sealing ring 1 and the inner wall of the tube to be tested to achieve a higher quality seal; it should be understood that a vent hole can be set inside the first extrusion element 2 or the second extrusion element 3 to ventilate the tube to be tested and thereby achieve side leakage.

[0042] As an optional embodiment of this case, the anti-slip structure 4 includes a plurality of evenly arranged tapered structures with one end larger than the other, with the smaller ends of the tapered structures facing the sealing ring 1. The smaller ends of the tapered structures face the sealing ring 1. Under pressure, the tips of the tapered structures can better adapt to surface irregularities of the sealing ring 1 and embed into the surface of the sealing ring 1, providing additional anti-slip force and preventing the sealing structure from sliding under stress, thereby improving overall stability and reliability. Furthermore, the tapered structures act as if the sealing ring 1 is being nailed down, ensuring that the rubber at the edge of the inner ring hole of the sealing ring 1 is always controlled to expand regularly and evenly within a certain range, thereby achieving a uniform expansion seal for the sealing ring 1.

[0043] As an optional embodiment of the present case, the two groups of conical structures respectively provided on the first extrusion element 2 and the second extrusion element 3 are arranged in a non-aligned manner to avoid the risk of collision when the conical structures on the first extrusion element 2 and the second extrusion element 3 are in an aligned state, thereby protecting the sealing ring 1 and the conical structure, and also avoiding reducing the extrusion stroke of the first extrusion element 2 and the second extrusion element 3, thereby allowing the sealing ring 1 to be fully extruded and expanded.

[0044] like Figure 1-6 As shown, as an optional embodiment of the present case, the first extrusion element 2 is a sleeve-shaped structure having a mounting end 21 and a limiting end 22; the second extrusion element 3 is a rod-shaped structure having a sliding end 31 and an extrusion end 32, and part of the structure of the second extrusion element 3 is inserted into the first extrusion element 2, and the second extrusion element 3 is matched with the first extrusion element 2 to facilitate the linear relative movement of the first extrusion element 2 and the second extrusion element 3; the sliding end 31 slides into the sleeve-shaped limiting end 22; the diameter of the extrusion end 32 is larger than the inner diameter of the limiting end 22 and is located on the outside of the limiting end 22; the sealing ring 1 is sleeved on the second extrusion element 3 and is limited between the extrusion end 32 and the limiting end 22. When the extrusion end 32 and the limiting end 22 are close to each other, the sealing ring 1 is uniformly extruded and expanded and deformed.

[0045] like Figure 1 、 8-9, as an optional embodiment of the present case, a first telescopic driving member 5 is provided near the mounting end 21 and is relatively fixed in position with respect to the mounting end 21, and the first telescopic driving member 5 includes a first telescopic rod 51 arranged along the axial direction of the second extrusion element 3, and the first telescopic rod 51 is connected to the sliding end 31; the mounting end 21 can be fixedly connected to the first telescopic driving member 5, and the mounting end 21 can also be provided on other structures, as long as the relative position of the first telescopic driving member 5 and the mounting end 21 is fixed, the first telescopic driving member 5 drives the first telescopic rod 51 to perform telescopic movement, thereby realizing the relative sliding of the first extrusion element 2 and the second extrusion element 3, and further realizing the tightening or relaxation of the sealing ring 1 by the limiting end 22 and the extrusion end 32.

[0046] like Figure 1 、 9 As shown, as an optional embodiment of this case, an extension rod 52 is further provided between the first telescopic rod 51 and the sliding end 31. One end of the extension rod 52 is connected to the first telescopic rod 51, and the other end of the extension rod 52 is connected to the sliding end 31. It should be understood that when the workpiece 100 to be tested is too long, the extension rod 52 can be used according to the test requirements. When the workpiece 100 to be tested is short, the extension rod 52 is not required. The provision of the extension rod 52 ensures that the sealing structure is adaptable to workpieces 100 of different lengths.

[0047] like Figure 8-9 As shown, the present invention also provides an airtightness detection device 200, including the above-mentioned sealing structure, so that the airtightness detection device 200 with the above-mentioned sealing structure is also within the protection scope of this case.

[0048] like Figure 8-9 As shown, as an optional embodiment of the present case, the airtightness detection device 200 includes a base 6 and a first support seat 61; the first support seat 61 is arranged on the base 6, for example, the base 6 is a plate, and the first support seat 61 is vertically fixed to the plate; the first telescopic drive member 5 is arranged on the base 6, and the mounting end 21 of the first extrusion element 2 is vertically mounted on one side of the first support seat 61, and one end of the first telescopic rod 51 can be telescopically passed through the first support seat 61 and detachably connected to the sliding end 31, for example, the end of the first telescopic rod 51 is detachably connected to the sliding end 31 by a screw 511 or a bolt, thereby facilitating the disassembly, replacement or maintenance of each component. Wherein, the first telescopic rod 51 is configured to be able to pull the extrusion end 32 to squeeze toward the sealing ring 1, so that the outer ring of the sealing ring 1 expands and increases to seal the inner ring of the tube body to be tested.

[0049] like Figure 8-9As shown, as an optional embodiment of the present case, the base 6 is also provided with a second support seat 62 and a second telescopic drive member 63, and the second telescopic drive member 63 is provided on the second support seat 62, and the second support seat 62 is vertically fixed on the base 6; the second telescopic drive member 63 includes a second telescopic rod 631 with the same axial direction as the corresponding end of the tube body to be measured, and the second telescopic rod 631 is close to the end of the first support seat 61. A sealing component 7 for sealing the outside of the port of the workpiece 100 to be measured is provided, so that the sealing component 7 blocks the end of the tube body to be measured away from the sealing structure, wherein the sealing component 7 only needs to block the outer end of the port of the tube body to be measured. This solution is aimed at the case where only one end of the workpiece 100 to be measured needs to be sealed by the sealing structure. By extending the second telescopic rod 631, the sealing pressure of the sealing component 7 to block the port of the workpiece 100 to be measured can be increased, thereby improving the sealing performance.

[0050] like Figure 8-9 As shown, as an optional embodiment of this case, the sealing assembly 7 includes a plugging cover with a cylindrical structure at one end, the inner diameter of the plugging cover is matched with the outer diameter of the tube body to be tested, and a rubber ring can be provided on the plugging cover to enhance the sealing.

[0051] like Figure 9 As shown, as an optional embodiment of the present case, the sealing assembly 7 and / or the sealing structure are provided with an air inlet line for inflating the tube body to be tested; for example, an air inlet line is provided on the sealing assembly 7, and the air inlet 8 of the air inlet line can be provided on either the sealing assembly 7 or the second telescopic rod 631, and the other end of the air inlet line is connected to the side of the plugging cover facing the tube body to be tested, thereby enabling inflation of air into the tube body to be tested. For another example, the sealing structure is provided with an air inlet line, specifically, the air inlet end of the air inlet line is provided on the radial surface of the sliding end 31 of the second extrusion element 3, and the air outlet end of the air inlet line is provided in the axial direction of the extrusion end 32 of the second extrusion element 3, thereby facilitating ventilation of the tube body to be tested.

[0052] like Figure 8-9 As shown, as an optional embodiment of the present case, the position of the first support seat 61 or the first telescopic drive member 5 on the base 6 is adjustable along the length direction of the first telescopic rod 51, and the base 6 is also provided with a limiting structure for limiting the first support seat 61 or the first telescopic drive member 5, so that the position of the first support seat 61 or the first telescopic drive member 5 can adapt to workpieces 100 to be measured of different lengths.

[0053] like Figure 8-9As shown, as an optional embodiment of the present invention, the first telescopic drive member 5 and / or the second telescopic drive member 63 in the present invention can be a cylinder, a hydraulic cylinder, an electric telescopic rod, etc. The first telescopic drive member 5 and / or the second telescopic drive member 63 are generally standard parts, thereby reducing manufacturing costs.

[0054] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed in the present invention are intended to be covered by the claims of the present invention.

[0055] Reference throughout this specification to "one embodiment," "an embodiment," or "a specific embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention, and not necessarily in all embodiments. Thus, various appearances of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout this specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, or characteristics of any specific embodiment of the invention may be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments of the invention described and illustrated herein are possible in light of the teachings herein and are considered part of the spirit and scope of the invention.

[0056] Thus, although the present invention has been described herein with reference to specific embodiments thereof, freedom of modification, various changes and substitutions are within the foregoing disclosure, and it should be understood that in some cases, some features of the present invention will be employed without the corresponding use of other features without departing from the scope and spirit of the proposed invention. Thus, many modifications may be made to adapt particular circumstances or materials to the true scope and spirit of the present invention. The present invention is not intended to be limited to the specific terminology used in the claims below and / or to the specific embodiments disclosed as the best mode contemplated for carrying out the invention, but the present invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Therefore, the scope of the present invention will be determined solely by the appended claims.

Claims

1. A sealing structure, applied to an airtightness detection device, for sealing the mouth of a workpiece to be tested, characterized in that: The sealing structure includes a sealing ring, and a first extrusion element and a second extrusion element respectively arranged on both sides of the sealing ring, wherein the first extrusion element and the second extrusion element are arranged to open and close relative to each other; an anti-slip structure is provided on the side of the first extrusion element and / or the second extrusion element that is in contact with the sealing ring.

2. The sealing structure according to claim 1, wherein: The anti-slip structure includes a plurality of evenly arranged conical structures with one end being larger and the other end being smaller, and the small end of the conical structure is arranged toward the sealing ring.

3. The sealing structure according to claim 2, characterized in that: The two groups of tapered structures respectively provided on the first extrusion element and the second extrusion element are arranged in a non-aligned manner.

4. The sealing structure according to claim 1, wherein: The first extrusion element is a sleeve-shaped structure having a mounting end and a limiting end; The second extrusion element is a rod-shaped structure having a sliding end and an extrusion end, and the sliding end slides into the sleeve-shaped limiting end; the diameter of the extrusion end is larger than the inner diameter of the limiting end; The sealing ring is sleeved on the second extrusion element and is limited between the extrusion end and the limiting end.

5. The sealing structure according to claim 4, characterized in that: A first telescopic driving member is provided adjacent to the mounting end and is fixed relative to the mounting end. The first telescopic driving member includes a first telescopic rod arranged along the axial direction of the second extrusion element, and the telescopic rod is connected to the sliding end.

6. The sealing structure according to claim 5, characterized in that: An extension rod is further provided between the telescopic rod and the sliding end, one end of the extension rod is connected to the telescopic rod, and the other end of the extension rod is connected to the sliding end.

7. An airtightness detection device, characterized in that: The sealing structure comprises the sealing structure according to any one of claims 1 to 6.

8. The airtightness detection device according to claim 7, characterized in that: include: base; A first support seat is provided on the base; The first telescopic driving member is arranged on the base, the first extrusion element includes a mounting end, and the mounting end is vertically mounted on one side of the first support seat. The first telescopic driving member includes a first telescopic rod, and the second extrusion element includes a sliding end. One end of the first telescopic rod can be telescopically passed through the first support seat and is detachably connected to the sliding end.

9. The airtightness detection device according to claim 8, characterized in that: The base is also provided with a second telescopic driving member; The second telescopic driving member includes a second telescopic rod having the same axial direction as the corresponding end of the workpiece to be measured, A blocking component for blocking the outside of the port of the workpiece to be measured is provided at one end of the second telescopic rod close to the first supporting seat.

10. The airtightness detection device according to claim 9, characterized in that: The blocking component and / or the sealing structure is provided with an air inlet for inflating air into the workpiece to be measured.

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