Keel internal expansion sealing core

Abstract

A plurality of spacer bushes are sleeved on a main rod positioned between a mounting piece and a limiting ring, a rod body is in clearance fit with a small hole of a step through hole, a sealing ring is sleeved on a matching section, the matching section is inserted into a large hole of the step 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 hidden type sealing ring has the advantages 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 utility model relates to sealing performance detection, especially keel inner expansion sealing core. BACKGROUND

[0002] In industrial production, many parts need to be tested for air tightness, and some complex parts need to be segmented and sealed (such as Figure 8 ), which requires high-pressure air tightness testing of each channel and part, and layered sealing of the main hole and other channels. The conventional scheme has the following design difficulties:

[0003] 1. It is difficult to select the size of the internal sealing ring. If the size is too large, the sealing ring will be broken during installation. If the size is too small, it cannot guarantee effective sealing.

[0004] 2. The traditional inner expansion core cannot control the compression amount of multiple rubber rings to remain consistent. When the main hole is long, the relative position may change, resulting in sealing failure. INVENTION CONTENTS

[0005] The utility model aims at overcoming the shortcomings of the prior art and providing a keel inner expansion sealing core.

[0006] The utility model discloses a keel inner expansion sealing core, which comprises a main rod, the main rod comprises a rod body, a matching section and a limiting ring are sequentially arranged on 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, a first inclined surface is formed on the outer edge of the upper end surface of the limiting ring;

[0007] An installation piece is arranged on the main rod, a stepped blind hole is formed on the lower end surface of the installation piece, the top of the rod body is slidably connected in the small hole of the stepped blind hole, a second inclined surface is formed on the outer edge of the lower end surface of the installation piece;

[0008] A spacer sleeve is arranged on the main rod, a stepped through hole is formed 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, an installation step is formed on the top of the spacer sleeve, a limiting plug extending axially upward is arranged on the installation step, a first inclined surface is formed on the outer edge of the installation step, and a second inclined surface is formed on the outer edge of the lower end surface of the spacer sleeve;

[0009] A plurality of spacer sleeves are sleeved on the main rod between the installation piece and the limiting ring, the rod body is in clearance fit with the small hole of the stepped through hole, a sealing ring is sleeved on the matching section, the matching section is inserted into the large hole of the stepped through hole of the bottom spacer sleeve, a sealing ring is also sleeved on the limiting plug, and the limiting plug is inserted into the large hole of the corresponding stepped through hole between adjacent spacer sleeves, wherein the limiting plug of the top spacer sleeve is inserted into the large hole of the stepped blind hole.

[0010] The large hole depth of the stepped blind hole is consistent with the large hole depth of the stepped through hole, the height of the limiting plug is greater than the large hole depth of the stepped through hole, and the height of the limiting plug is less than the sum of the large hole depth of the stepped 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 slot is radially formed through the top of the rod body, a matching limiting pin is installed in the waist-shaped slot, a pin hole is formed in the mounting piece, and the two ends of the limiting pin pass through the waist-shaped slot and are matched and installed in the corresponding pin holes.

[0013] Optionally, a ventilation hole is formed in the top surface of the rod body, and the ventilation hole is in communication with the waist-shaped slot.

[0014] Optionally, the top of the limiting ring is further provided with a protruding convex column, and a protective sleeve is sleeved on the convex column.

[0015] Optionally, the protective sleeve sequentially has a first conical section, a cylindrical section and a second conical section from top to bottom, and the conical surfaces of the first conical section and 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 sleeve.

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

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

[0019] The utility model has the following advantages:

[0020] 1. The sealing ring is installed in a hidden mode, and the sealing ring will not be broken by the intersecting line during installation. After being extruded, the outer circular part of the sealing ring can expand to 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 limiting plug, the compression amount of the sealing ring can be controlled, thereby making the compression amounts of multiple sealing rings consistent, and thereby achieving segmented sealing of the inside of the super-long hole with good sealing effect.

[0022] 3. Low use cost, only need to replace the sealing rubber ring regularly during long-term use. DRAWINGS

[0023] Figure 1 The structure of the utility model is shown Figure 1 ;

[0024] Figure 2 The structure of the utility model is shown Figure 2 ;

[0025] Figure 3 is Figure 2 is a sectional view of A-A in the middle;

[0026] Figure 4 is a structure schematic diagram of the spacer after lamination;

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

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

[0029] Figure 7 is a structure schematic diagram of the mounting piece;

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

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

[0032] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0034] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0035] It should be noted that like reference numerals and letters refer to like items in the several views, and once an item is defined in one view, it need not be further defined and explained in the subsequent views.

[0036] In the description of the utility model, it needs to explain, the term "center", "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and so on indicate the orientation or position relation is based on the orientation or position relation shown in the drawing, or it is the orientation or position relation that the utility model product uses usually, or it is the orientation or position relation that the person skilled in the art usually understands, just is for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the indicated device or element must have a particular orientation, construct and operate with a particular orientation, therefore can not be understood as the limitation to the utility model.In addition, the term "first", "second" and so on are just for distinguishing the description, and can not be understood as indicating or implying relative importance.

[0037] In the description of the utility model, it also needs to explain that, unless otherwise explicitly specified and limited, the term "set", "installation", "connect", "connection" should be broad understanding, for example, can be fixed connection, can also be detachable connection, or integrally connected;Can be mechanical connection, can also be electrical connection;It can be directly connected, can also be indirectly connected through intermediate medium, can be the communication inside two elements.For the person skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0038] As shown in Figure 1 , Figure 2 and Figure 3 , the keel inner inflation sealing core, including main rod 1, mounting piece 4, spacer sleeve 2 and sealing ring 3, in the embodiment, as shown in Figure 5 , the main rod 1 includes rod body 11, the bottom of rod body 11 is provided with cooperation section 14 and limiting ring 12 in sequence, the diameter of cooperation section 14 is greater than the diameter of rod body 11, the diameter of limiting ring 12 is greater than the diameter of cooperation section 14, the outer edge of limiting ring 12 upper end face is provided with first inclined surface 22.

[0039] In the embodiment, as shown in Figure 7 , the lower end surface of mounting piece 4 is provided with stepped blind hole 41, the top of rod body 11 is slidably fitted in the small hole of stepped blind hole 41, the outer edge of mounting piece 4 lower end surface is provided with second inclined surface 23.

[0040] In the embodiment, as shown in Figure 4As shown, the spacer sleeve 2 is provided with a stepped through hole 24, 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, the top of the spacer sleeve 2 is provided with a mounting step 25, the mounting step 25 is provided with an axially upward extending limiting plug 21, the outer edge of the mounting step 25 is provided with a first inclined surface 22, the outer edge of the lower end surface of the spacer sleeve 2 is provided with a second inclined surface 23;

[0041] In the embodiment, as shown in Figure 1 、 Figure 2 and Figure 3 , a plurality of spacer sleeves 2 are sleeved on the main rod 1 between the mounting member 4 and the limiting ring 12, the rod body 11 is in clearance fit with the small hole of the stepped through hole 24, the matching section 14 is sleeved with a sealing ring 3, the matching section 14 is inserted into the large hole of the stepped through hole 24 of the bottom spacer sleeve 2, the limiting plug 21 is also sleeved with a sealing ring 3, and between the adjacent spacer sleeves 2, the limiting plug 21 is inserted into the large hole of the corresponding stepped through hole 24, wherein the limiting plug 21 of the top spacer sleeve 2 is fitted and inserted into the large hole of the stepped blind hole 41.

[0042] In the embodiment, as shown in Figure 3 and Figure 4As shown, the large hole depth of the stepped blind hole 41 is consistent with the large hole depth of the stepped through hole 24, and the height of the limiting plug 21 is greater than the large hole depth of the stepped through hole 24, and the height of the limiting plug 21 is less than the sum of the large hole depth of the stepped through hole 24 and the diameter of the sealing ring 3, so when the spacer sleeve 2 is subjected to an axial force, the limiting plug 21 will penetrate into the large hole of the corresponding stepped blind hole 41 or the large hole of the stepped through hole 24, and since the large hole depth of the stepped blind hole 41 is consistent with the large hole depth of the stepped through hole 24, that is, the depth of the limiting plug 21 penetrating into the large hole of the stepped through hole 24 is consistent, and since the height of the limiting plug 21 is less than the sum of the large hole depth of the stepped through hole 24 and the diameter of the sealing ring 3, it is ensured that the limiting plug 21 can extrude the sealing ring 3 during penetration, so that the sealing ring 3 is compressed, and when the sealing ring 3 is extruded, if the upper and lower extrusion surfaces of the sealing ring 3 are flat, the sealing ring 3 can only change 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 reaction force of the sealing ring 3 in the axial direction is large, which requires a higher downward pressure on the spacer sleeve 2, thereby making the entire sealing core inconvenient to operate and not reliable, and most importantly, when the main hole is long, the stress on the sealing ring 3 cannot be effectively controlled, thereby causing the deformation of the sealing ring 3 to be inconsistent, thereby causing the sealing performance between the sections of the test piece to be inconsistent, so in use, it is easy to cause the sealing failure of the weak sealing area, and in the present 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 extruded, the inner ring of the sealing ring 3 is extruded by a flat surface, but the outer ring of the sealing ring 3 is located in the V-shaped opening, so that the V-shaped opening can provide space for the expansion of the sealing ring 3 after being extruded in the axial direction, so that the sealing ring 3 can expand, thereby making the spacer sleeve 2 easy to move in the axial direction, and the expanded sealing ring 3 can 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 sealing performance and reliability of the spacer sleeve 2 and the test piece.

[0043] In the present embodiment, as shown in Figure 3 and Figure 4As shown, the outer diameter of the sealing ring 3 is less than or equal to the outer diameter of the spacer sleeve 2, that is, the sealing ring 3 is not protruding from the spacer sleeve 2 in the uncompressed state. Since the test piece has a plurality of holes, when two holes are mutually angled through, such as vertical and horizontal perforations, the intersection line will form a sharp edge. The conventional sealing structure will be in contact with the edge when the sealing ring 3 is installed, thereby damaging the sealing ring 3, reducing the service life of the sealing ring 3, and even causing sealing failure. In the embodiment, the sealing ring 3 is installed in a hidden manner, and the sealing ring 3 does not come into contact with the intersection line when the sealing core is installed, thereby avoiding damage to the sealing ring 3, ensuring the service life of the sealing ring 3, and facilitating installation.

[0044] In the embodiment, when an external force is applied to the mounting member 4, it is difficult to ensure that only an axial force is applied to the mounting member 4. In the embodiment, as shown in Figure 3 and Figure 5 As shown, the top of the rod body 11 is radially provided with a through waist-shaped groove 6, and a matching limiting pin 5 is installed in the waist-shaped groove 6. The mounting member 4 is provided with a pin hole 8, and the two ends of the limiting pin 5 pass through the waist-shaped groove 6 and are matched and installed in the corresponding pin hole 8. In the embodiment, the diameter of the limiting pin 5 matches the width of the waist-shaped groove 6, and in the axial direction, the limiting pin 5 can move along the waist-shaped groove 6. After an external force is applied to the mounting bracket, the mounting member 4 can only move axially relative to the main rod 1, thereby enabling the mounting member 4 to only apply an axial force to the spacer sleeve 2. The spacer sleeve 2 is matched and installed on the main rod 1, and thus the spacer sleeve 2 can only transmit an axial force, thereby ensuring the axial movement and axial extrusion of the spacer sleeve 2 on the sealing ring 3.

[0045] In the embodiment, as shown in Figure 3 and Figure 5 As shown, the top surface of the rod body 11 is provided with a vent hole 9, which is communicated with the waist-shaped groove 6. Therefore, when the mounting member 4 is pressed down, the gas in the stepped blind hole 41 can be guided into the waist-shaped groove 6 through the vent hole 9 and then discharged through the pin hole 8. In the embodiment, in order to facilitate the disassembly and assembly of the limiting pin 5, the limiting pin 5 and the pin hole 8 are intermittently matched. In the initial state of the sealing core, there is a gap between the limiting plug 21 and the table surface of the stepped through hole 24, and the gap also contains air. In the embodiment, the rod body 11 and the small hole of the stepped through hole 24 are gap matched, the gap itself is relatively small, and the contained air is also small. When the limiting plug 21 is deeply inserted into the large hole of the stepped through hole 24, the air can be discharged through the gap of the gap matching, thereby avoiding air resistance, and enabling the limiting plug 21 to abut against the stepped surface of the stepped through hole 24.

[0046] In the embodiment, asFigure 3 and Figure 5 As shown in the figure, the top of the limiting ring 12 is further provided with a convex column 13, and the convex column 13 is sleeved with a protective sleeve 7, and further, as shown in the figure, Figure 6 As shown in the figure, the protective sleeve 7 has a first tapered section 71, a cylindrical section 73 and a second tapered section 72 from top to bottom, the taper surfaces of the first tapered section 71 and the second tapered section 72 are parallel to each other, and by arranging the first tapered section 71 and the second tapered section 72, the sealing core can be well inserted into the inner hole of the test piece, the protective sleeve 7 has the function of avoiding the main rod 1 from colliding with the inner hole of the test piece, and preferably, the protective sleeve 7 is a nylon sleeve, the nylon sleeve has a certain structural strength, so it is convenient to insert into the inner hole of the test piece, and even if the nylon sleeve collides with the test piece during insertion, 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 the embodiment, the inner side wall of the large hole of the stepped blind hole 41, the inner side wall of the large hole of the stepped through hole 24 and the outer side wall of the connecting plug are all provided with a wear-resistant layer, and the wear-resistant layer coated on the metal surface belongs to the prior art, so it will not be described again, and by arranging the wear-resistant layer, the service life of the spacer sleeve 2 can be ensured.

[0048] Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement to part of the technical features, and any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A keel internal expansion sealing core, characterized in that: The device includes a main rod, which includes a rod body. A mating section and a limiting ring are sequentially arranged at the bottom of the rod body. The diameter of the mating section is larger than the diameter of the rod body, and the diameter of the limiting ring is larger than the diameter of the mating section. A first inclined surface is formed on the outer edge of the upper end face of the limiting ring. The mounting component has a stepped blind hole on its lower end face, and the top of the rod is slidably fitted into the small hole of the stepped blind hole. A second inclined surface is formed on the outer edge of the lower end face of the mounting component. The spacer has a stepped through hole inside, the small hole diameter of which matches the diameter of the rod body, and the large hole diameter of which matches the diameter of the mating section. The top of the spacer has an installation step, and the installation step is provided with an axially upward extending limiting plug. The outer edge of the installation step has a first inclined surface, and the outer edge of the lower end face of the spacer has a second inclined surface. A plurality of spacers are fitted on the main rod located between the mounting component and the limiting ring, and the rod body is clearance-fitted with the small hole of the stepped through hole. A sealing ring is fitted on the fitting section, and the fitting section is inserted into the large hole of the stepped through hole of the bottom spacer. A sealing ring is also fitted on the limiting plug, and between adjacent spacers, the limiting plug is inserted into the large hole of the corresponding stepped through hole. The limiting plug of the top spacer is fitted into the large hole of the stepped blind hole. The depth of the large hole of the stepped blind hole is the same as the depth of the large hole of the stepped through hole, and the height of the limiting plug is greater than the depth of the large hole of the stepped through hole, and the height of the limiting plug is less than the sum of the depth of the large hole of the stepped 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: The top of the rod has a through waist-shaped groove, and a matching limiting pin is installed in the waist-shaped groove. The mounting part has a pin hole, and the two ends of the limiting pin pass through the waist-shaped groove and are fitted into the corresponding pin hole.

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, and the vent hole is connected to the waist-shaped groove.

4. The keel inner expansion sealing core according to claim 1, characterized in that: The top of the limiting ring is also provided with a protruding post, and a protective sleeve is fitted on the protruding post.

5. The keel inner expansion sealing core according to claim 1, characterized in that: The protective sleeve has a first conical section, a cylindrical section and a second conical section from top to bottom, with the conical surfaces of the first conical section and the second conical section being 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 less 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 wall of the large hole of the stepped blind hole, the inner wall of the large hole of the stepped through hole, and the outer wall of the connector are all provided with a wear-resistant layer.

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