Keel internal expansion sealing core

Abstract

A plurality of spacer bushes are sleeved on a main rod between a mounting piece and a limiting ring, a rod body is in clearance fit with a small hole of a stepped through hole, a sealing ring is sleeved on a matching section, the matching section is inserted into a large hole of the stepped through hole of the spacer bush at the bottom, a sealing ring is also sleeved on a limiting plug, and a sealing ring is arranged between every two adjacent spacer bushes. The limiting plugs are inserted into the large holes of the corresponding step through holes, and the limiting plugs of the spacer bushes located on the top are inserted into the large holes of the step blind holes in a matched mode. The sealing ring has the beneficial effects that the sealing ring is installed in a hidden mode, the sealing ring cannot be broken by an intersecting line in the installation process, the outer circle part of the sealing ring can be expanded after extrusion, then the V-shaped opening is filled, and the sealing performance is guaranteed; by controlling the insertion depth of the limiting plug, the compression amount of the sealing rings can be controlled, so that the compression amounts of the multiple sealing rings are consistent, segmented sealing of the interior of the super-long hole can be completed, and the sealing effect is good.

Description

Technical Field

[0001] The invention relates to sealing performance detection, in particular to a keel inner expansion sealing core. Background Art

[0002] In industrial production, many parts need to be tested for airtightness, and some complex parts need to be sealed in sections (such as Figure 8 ), each channel and part needs to be tested for high pressure airtightness. The main hole intersects with other channels and needs to be sealed in layers. The conventional solution has the following design difficulties:

[0003] 1. It is difficult to select the specifications of the internal sealing ring. If the specifications are too large, the sealing ring will be damaged during installation, and if the specifications are too small, effective sealing cannot be guaranteed.

[0004] 2. The traditional internal expansion core cannot control the compression of multiple rubber rings to be consistent. When the main hole is long, the relative position may change, resulting in sealing failure. Summary of the invention

[0005] The purpose of the present invention is to overcome the disadvantages of the prior art and provide a keel internal expansion sealing core.

[0006] The object of the present invention is achieved by the following technical scheme: the keel internal expansion sealing core comprises a main rod, the main rod comprises a rod body, a matching section and a limiting ring are sequentially arranged at the bottom of the rod body, the diameter of the matching section is larger than the diameter of the rod body, the diameter of the limiting ring is larger than the diameter of the matching section, and the outer edge of the upper end surface of the limiting ring is provided with a first inclined surface;

[0007] A mounting piece, wherein a step blind hole is provided on the lower end surface of the mounting piece, the top of the rod body is slidably mounted in the small hole of the step blind hole, and a second inclined surface is provided on the outer edge of the lower end surface of the mounting piece;

[0008] A spacer sleeve, a stepped through hole is provided in the spacer sleeve, the diameter of the small hole of the stepped through hole matches the diameter of the rod body, the diameter of the large hole of the stepped through hole matches the diameter of the matching section, a mounting step is provided on the top of the spacer sleeve, a limit plug extending axially upward is provided on the mounting step, a first inclined surface is provided on the outer edge of the mounting step, and a second inclined surface is provided on the outer edge of the lower end surface of the spacer sleeve;

[0009] A plurality of spacers are mounted on the main rod between the mounting member and the limiting ring, and the rod body is matched with the small hole gap of the step through hole, a sealing ring is mounted on the matching section, and the matching section is inserted into the large hole of the step through hole of the bottom spacer, and a sealing ring is also mounted on the limiting plug, and between adjacent spacers, the limiting plug is inserted into the large hole of the corresponding step through hole, wherein the limiting plug of the spacer at the top is matched and inserted into the large hole of the step blind hole;

[0010] The large hole depth of the step blind hole is consistent with the large hole depth of the step through hole, and the height of the limit plug is greater than the large hole depth of the step through hole, and the height of the limit plug is less than the sum of the large hole depth of the step through hole and the diameter of the sealing ring;

[0011] The first inclined surface and the corresponding second inclined surface form a V-shaped opening.

[0012] Optionally, a waist-shaped groove is radially opened on the top of the rod body, a matching limit pin is installed in the waist-shaped groove, a pin hole is opened on the mounting piece, both ends of the limit pin pass through the waist-shaped groove, and both ends of the limit pin are installed in the corresponding pin holes.

[0013] Optionally, a vent hole is provided on the top surface of the rod body, and the vent hole is communicated with the waist-shaped groove.

[0014] Optionally, a raised boss is provided on the top of the limiting ring, and a protective sleeve is sleeved on the boss.

[0015] Optionally, the protective cover has a first conical section, a cylindrical section and a second conical section from top to bottom, and the conical surface of the first conical section and the conical surface of the second conical section are parallel to each other.

[0016] Optionally, the outer diameter of the sealing ring is less than or equal to the outer diameter of the spacer.

[0017] Optionally, the inner side wall of the large hole of the step blind hole, the inner side wall of the large hole of the step through hole, and the outer side wall of the connecting plug are all provided with a wear-resistant layer.

[0018] Optionally, the protective cover is a nylon cover.

[0019] The present invention has the following advantages:

[0020] 1. The sealing ring is installed in a hidden way. When installing, the sealing ring will not be torn by the intersecting line. Moreover, after being squeezed, the outer circle of the sealing ring can expand and fill the V-shaped opening, thereby increasing the contact area with the test piece and ensuring the sealing performance.

[0021] 2. By controlling the insertion depth of the limit plug, the compression amount of the sealing ring can be controlled, so that the compression amounts of multiple sealing rings are consistent, thereby completing the segmented sealing inside the extra-long hole with good sealing effect.

[0022] 3. Low cost of use, only the sealing rubber ring needs to be replaced regularly for long-term use; BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The structure of the present invention is schematically shown Figure 1 ;

[0024] Figure 2 The structure of the present invention is schematically shown Figure 2 ;

[0025] Figure 3 for Figure 2 Schematic cross-sectional view of AA in the figure;

[0026] Figure 4 It is a schematic diagram of the structure after the spacers are stacked;

[0027] Figure 5 The schematic diagram of the main rod structure;

[0028] Figure 6 It is a schematic diagram of the structure of the protective cover;

[0029] Figure 7 It is a structural schematic diagram of the installation parts;

[0030] Figure 8 It is a schematic diagram of the structure of the test piece;

[0031] In the figure, 1-main rod, 2-spacer, 3-sealing ring, 4-mounting part, 5-limiting pin, 6-waist-shaped groove, 7-conical head, 8-pin hole, 9-ventilation hole, 11-rod body, 12-limiting ring, 13-convex column, 14-matching section, 21-limiting plug, 22-first inclined surface, 23-second inclined surface, 24-step through hole, 25-installing step, 41-blind hole, 71-first conical section, 72-second conical section, 73-cylindrical section. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0036] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use, or the positions or positional relationships commonly understood by those skilled in the art, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] like Figure 1 , Figure 2 and Figure 3 As shown, the keel internal expansion sealing core includes a main rod 1, a mounting member 4, a spacer 2 and a sealing ring 3. In this embodiment, as shown in FIG. Figure 5 As shown, the main rod 1 includes a rod body 11, and the bottom of the rod body 11 is provided with a matching section 14 and a limiting ring 12 in sequence. The diameter of the matching section 14 is larger than the diameter of the rod body 11, and the diameter of the limiting ring 12 is larger than the diameter of the matching section 14. The outer edge of the upper end surface of the limiting ring 12 is provided with a first inclined surface 22.

[0039] In this embodiment, if Figure 7 As shown, a step blind hole 41 is provided on the lower end surface of the mounting member 4, the top of the rod body 11 is slidably mounted in the small hole of the step blind hole 41, and a second inclined surface 23 is provided on the outer edge of the lower end surface of the mounting member 4.

[0040] In this embodiment, if Figure 4 As shown, a stepped through hole 24 is provided in the spacer sleeve 2, the small hole diameter of the stepped through hole 24 matches the diameter of the rod body 11, the large hole diameter of the stepped through hole 24 matches the diameter of the matching section 14, a mounting step 25 is provided on the top of the spacer sleeve 2, a limit plug 21 extending axially upward is provided on the mounting step 25, a first inclined surface 22 is provided on the outer edge of the mounting step 25, and a second inclined surface 23 is provided on the outer edge of the lower end surface of the spacer sleeve 2;

[0041] In this embodiment, if Figure 1 , Figure 2 and Figure 3 As shown, a plurality of spacers 2 are mounted on the main rod 1 between the mounting member 4 and the limiting ring 12, and the rod body 11 is fitted with a small hole gap in the step through hole 24, a sealing ring 3 is mounted on the fitting section 14, and the fitting section 14 is inserted into the large hole of the step through hole 24 of the bottom spacer 2, a sealing ring 3 is also mounted on the limiting plug 21, and between adjacent spacers 2, the limiting plug 21 is inserted into the large hole of the corresponding step through hole 24, wherein the limiting plug 21 of the spacer 2 at the top is fitted and inserted into the large hole of the step blind hole 41.

[0042] In this embodiment, if Figure 3 and Figure 4 As shown, the large hole depth of the step blind hole 41 is consistent with the large hole depth of the step through hole 24, and the height of the limit plug 21 is greater than the large hole depth of the step through hole 24, and the height of the limit plug 21 is less than the sum of the large hole depth of the step through hole 24 and the diameter of the sealing ring 3. Therefore, when the spacer 2 is subjected to axial force, the limit plug 21 will penetrate into the large hole of the corresponding step blind hole 41 or the large hole of the step through hole 24. Since the large hole depth of the step blind hole 41 is consistent with the large hole depth of the step through hole 24, that is, the limit plug 21 is deep. The depth of the limit plug 21 inserted into the large hole of the step through hole 24 is consistent, and because the height of the limit plug 21 is less than the sum of the large hole depth of the step through hole 24 and the diameter of the sealing ring 3, it is ensured that the limit plug 21 can squeeze the sealing ring 3 during the penetration process, so that the sealing ring 3 is compressed. When the sealing ring 3 is squeezed, if the upper and lower extrusion surfaces are flat, the sealing ring 3 can only be deformed in the axial direction, and the space for the axial change of the sealing ring 3 is limited, so the sealing effect of the sealing ring 3 cannot be guaranteed, and the sealing ring 3 is The reaction force is large, which also makes the downward pressure requirement of the spacer 2 high, which makes the operation of the entire sealing core inconvenient and the reliability is not high. The most important thing is that when the main hole is long, the force on the sealing ring 3 cannot be effectively controlled, which leads to inconsistent deformation of the sealing ring 3, and then leads to inconsistent sealing performance between the sections of the test piece. Therefore, when in use, it is easy to cause sealing failure in the area with weak sealing performance. In this embodiment, the first inclined surface 22 and the corresponding second inclined surface 23 form a V-shaped opening, that is, when the sealing ring 3 is squeezed, the inner ring of the sealing ring 3 is squeezed by the plane, but the outer ring of the sealing ring 3 is located at the V-shaped opening. Therefore, after the sealing ring 3 is axially squeezed, the V-shaped opening can provide space for the expansion of the sealing ring 3, so the sealing ring 3 can expand, so that the spacer 2 can easily move axially, and the expanded sealing ring 3 can occasionally fill the entire V-shaped opening, thereby increasing the contact area between the sealing ring 3 and the inner wall of the test piece, thereby ensuring the partition sealing performance and sealing reliability of the sealing core and the test piece.

[0043] In this embodiment, if Figure 3 and Figure 4 As shown, the outer diameter of the sealing ring 3 is less than or equal to the outer diameter of the spacer 2, that is, when the sealing ring 3 is not compressed, the sealing ring 3 does not protrude from the spacer 2. Since the test piece has a plurality of holes, when two holes penetrate each other at an angle, such as when a vertical perforation and a horizontal perforation penetrate each other, their intersection line will form a sharp edge, and the traditional sealing structure will contact the edge when the sealing ring 3 is installed, thereby scratching the sealing ring 3, thereby reducing the service life of the sealing ring 3, and severely causing its sealing failure. In the present embodiment, the sealing ring 3 is installed in a concealed manner. When the sealing core is installed, the sealing ring 3 will not contact the intersection line, thereby not causing damage to the sealing ring 3, thereby ensuring the service life of the sealing ring 3 and being more convenient to install.

[0044] In this embodiment, when external force is applied to the mounting member 4, it is difficult to ensure that only axial force is applied to the mounting member 4. Figure 3 and Figure 5 As shown, a waist-shaped groove 6 is radially provided on the top of the rod body 11, and a matching limit pin 5 is installed in the waist-shaped groove 6. A pin hole 8 is provided on the mounting member 4, and both ends of the limit pin 5 pass through the waist-shaped groove 6, and both ends of the limit pin 5 are installed in the corresponding pin holes 8. In this embodiment, the diameter of the limit pin 5 matches the width of the waist-shaped groove 6, and in the axial direction, the limit pin 5 can move along the waist-shaped groove 6, and through the cooperation between the limit pin 5 and the waist-shaped groove 6, after applying external force to the mounting frame, the mounting member 4 can only move axially relative to the main rod 1, so that the mounting member 4 can only apply axial force to the spacer sleeve 2, and the spacer sleeve 2 is installed on the main rod 1, so that only axial force can be transmitted between the spacers 2, thereby ensuring the axial movement of the spacer sleeve 2 and the axial extrusion of the sealing ring 3.

[0045] In this embodiment, if Figure 3 and Figure 5 As shown, a vent hole 9 is opened on the top surface of the rod body 11, and the vent hole 9 is connected to the waist-shaped groove 6. Therefore, when the mounting part 4 is pressed down, the gas in the stepped blind hole 41 can be introduced into the waist-shaped groove 6 through the vent hole 9, and finally discharged through the pin hole 8. In this embodiment, in order to facilitate the disassembly and assembly of the limit pin 5, the limit pin 5 and the pin hole 8 are intermittently matched, and the sealing core is in the initial state. There is a gap between the limit plug 21 and the table surface of the step through hole 24, and there is air in the gap. In this embodiment, the rod body 11 and the small hole of the step through hole 24 are clearance matched, and the gap itself is relatively small, and the air contained is also small. When the limit plug 21 penetrates into the large hole of the step through hole 24, the air can be discharged through the gap of the clearance match, thereby avoiding air resistance, so that the limit plug 21 can abut against the step surface of the step through hole 24.

[0046] In this embodiment, if Figure 3 and Figure 5 As shown, a raised boss 13 is also provided on the top of the limiting ring 12, and a protective sleeve 7 is sleeved on the boss 13. Further, as shown in FIG. Figure 6 As shown, the protective sleeve 7 has a first conical section 71, a cylindrical section 73 and a second conical section 72 from top to bottom, the conical surface of the first conical section 71 and the conical surface of the second conical section 72 are parallel to each other, and the sealing core can be well inserted into the inner hole of the test piece by arranging the first conical section 71 and the second conical section 72. The protective sleeve 7 has the function of preventing the main rod 1 from damaging the inner hole of the test piece. Preferably, the protective sleeve 7 is a nylon sleeve, which has a certain structural strength, so it is easy to insert into the inner hole of the test piece. At the same time, during insertion, even if the nylon sleeve collides with the test piece, the nylon sleeve will not cause damage to the inner hole of the test piece, thereby ensuring the reliability of the test of the test piece.

[0047] In this embodiment, the inner wall of the large hole of the step blind hole 41, the inner wall of the large hole of the step through hole 24, and the outer wall of the connecting plug are all provided with a wear-resistant layer. Coating a wear-resistant layer on a metal surface belongs to the prior art, so it will not be described in detail. By setting the wear-resistant layer, the service life of the spacer 2 can be guaranteed.

[0048] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Keel internal expansion sealing core, characterized by: The main rod comprises a rod body, a matching section and a limiting ring are sequentially arranged at the bottom of the rod body, the matching section has a diameter greater than the rod body, the limiting ring has a diameter greater than the matching section, and the outer edge of the upper end surface of the limiting ring is provided with a first inclined surface; A mounting member, wherein a step blind hole is provided on the lower end surface of the mounting member, the top of the rod body is slidably mounted in the small hole of the step blind hole, and a second inclined surface is provided on the outer edge of the lower end surface of the mounting member; A spacer sleeve, wherein a stepped through hole is provided in the spacer sleeve, the diameter of the small hole of the stepped through hole matches the diameter of the rod body, the diameter of the large hole of the stepped through hole matches the diameter of the matching section, a mounting step is provided on the top of the spacer sleeve, a limit plug extending axially upward is provided on the mounting step, a first inclined surface is provided on the outer edge of the mounting step, and a second inclined surface is provided on the outer edge of the lower end surface of the spacer sleeve; A plurality of the spacers are sleeved on the main rod between the mounting member and the limiting ring, and the rod body is fitted with a small hole gap of the step through hole, a sealing ring is sleeved on the fitting section, and the fitting section is inserted into the large hole of the step through hole of the bottom spacer, a sealing ring is also sleeved on the limiting plug, and between adjacent spacers, the limiting plug is inserted into the large hole of the corresponding step through hole, wherein the limiting plug of the spacer at the top is inserted into the large hole of the step blind hole; The large hole depth of the step blind hole is consistent with the large hole depth of the step through hole, and the height of the limit plug is greater than the large hole depth of the step through hole, and the height of the limit plug is less than the sum of the large hole depth of the step through hole and the diameter of the sealing ring; The first inclined surface and the corresponding second inclined surface form a V-shaped opening.

2. The keel inner expansion sealing core according to claim 1, characterized in that: A waist-shaped groove is radially opened on the top of the rod body, a matching limit pin is installed in the waist-shaped groove, a pin hole is opened on the mounting piece, both ends of the limit pin pass through the waist-shaped groove, and both ends of the limit pin are installed in the corresponding pin holes.

3. The keel inner expansion sealing core according to claim 1, characterized in that: A vent hole is provided on the top surface of the rod body, and the vent hole is communicated with the waist-shaped groove.

4. The keel inner expansion sealing core according to claim 1, characterized in that: A raised boss is also provided on the top of the limiting ring, and a protective sleeve is sleeved on the boss.

5. The keel inner expansion sealing core according to claim 1, characterized in that: The protective cover comprises a first conical section, a cylindrical section and a second conical section in sequence from top to bottom, and the conical surface of the first conical section and the conical surface of the second conical section are parallel to each other.

6. The keel inner expansion sealing core according to claim 1, characterized in that: The outer diameter of the sealing ring is smaller than or equal to the outer diameter of the spacer.

7. The keel inner expansion sealing core according to claim 1, characterized in that: The inner side wall of the large hole of the step blind hole, the inner side wall of the large hole of the step through hole, and the outer side wall of the connecting plug are all provided with a wear-resistant layer.

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