Sealing structure for blocking channel part in workpiece

Abstract

The utility model relates to a sealing structure used for blocking a channel part in a workpiece, which comprises a blocking joint provided with an extrusion area, a first sealing piece sleeved on a blocking piece and provided with a second axis B parallel to a first axis A of a channel to be blocked, and an extrusion piece used for extruding the first sealing piece. The regulating chamber is arranged in the extrusion area, at least part of the extrusion area is surrounded to form an independent cavity capable of being filled with a regulating medium M, and a deviation angle alpha generated by the second axis B and the first axis A can be eliminated through the regulating chamber, so that the channel is kept sealed; the regulating chamber has the advantages that the regulating chamber has a certain radial compensation capability, can realize all-dimensional relatively uniform radial compensation, can drive an extrusion part while having the radial compensation capability by using air as a regulating medium, is relatively good in sealing effect, can seal a large-diameter channel, and is simple in structure and relatively small in size.

Description

Technical Field

[0001] The utility model relates to the technical field of leak detection and plugging, in particular to a sealing structure for plugging a channel part in a workpiece. Background Art

[0002] Before leak detection, the channel between the cavity to be detected and the outside needs to be blocked to prevent fluid from leaking through the channel. When blocking the channel of a hole, an internal expansion blocking method is often used.

[0003] For example, the Chinese utility model patent "A forward-extending inward-expanding sealing mechanism" with patent number CN201921115486.8 (publication number CN210218674U) discloses a sealing structure, which has limit members that can be limited by a fixed retaining frame and an extrusion member driven by a cylinder at both ends of the sealing ring. The extrusion member is driven by the cylinder to move toward the limit member, so that the sealing ring is deformed and expanded to obtain an outer diameter larger than the channel size, and finally the sealing ring is interference fit with the inner wall of the channel to complete the sealing.

[0004] However, when the diameter of the channel to be blocked is large, for example, if the workpiece to be blocked is Figure 1 The workpiece 1' shown has a relatively conventional small diameter channel 2' and a relatively large diameter channel 3', and the diameter of the large diameter channel 3' of the product is 80 mm. Considering that the larger the diameter, the larger the position tolerance of the channel, when the device in the patent is used to block the large diameter channel, due to the lack of radial compensation capability for the relatively large position tolerance, commonly known as lack of "flexibility" in the relevant industry, the device in the patent may have certain difficulties in blocking the large diameter channel.

[0005] Specifically, Figure 2 As shown, the large diameter channel 3' also has an axis a'. When a conventional blocking mechanism 4' is used to block the large diameter channel 3', due to the relatively large position tolerance of the large diameter channel 3', the axis of the blocking mechanism 4' may be radially offset relative to the axis a', and the blocking mechanism 4' may be partially too close to the large diameter channel 3' to form a local force point 5'. At this time, the following two situations may occur according to the structure of the blocking mechanism 4':

[0006] 1. If the axis of the blocking mechanism 4' is rigid and difficult to deflect, it may be difficult to enter the large-diameter channel 3' due to the large resistance of the local force point 5', and even the large-diameter channel 3' or the blocking mechanism 4' may be damaged;

[0007] 2. If the axis of the blocking mechanism 4' has a certain deflection capability but does not have compensation capability, the following will occur: Figure 2In the situation shown, under the influence of the force f' at the local force point 5', the blocking mechanism 4' deflects relative to the axis a', and a gap 6' appears in the area opposite to the local force point 5' due to the deflection of the blocking mechanism 4'. Since the blocking mechanism 4' does not have a compensation capability, the deflection of the blocking mechanism 4' cannot be offset, and finally the blocking mechanism 4' is difficult to block the large diameter channel 3'. Therefore, further improvements are needed to the existing technology. Utility Model Content

[0008] The first technical problem to be solved by the utility model is to provide a sealing structure with radial compensation capability for blocking a channel portion in a workpiece in view of the above-mentioned existing technical status.

[0009] The second technical problem to be solved by the present invention is to provide a sealing structure for blocking the channel part in the workpiece, which can provide all-round and relatively uniform radial compensation in view of the above-mentioned existing technical status.

[0010] The technical solution adopted by the utility model to solve the first technical problem is: the sealing structure for blocking the channel part in the workpiece includes:

[0011] Plugging joint with extrusion area;

[0012] A first sealing member, sleeved on the plugging joint and located in the extrusion area, wherein the first sealing member has a second axis B parallel to the first axis A of the channel to be plugged;

[0013] An extrusion member connected in the extrusion area of ​​the plugging joint, located at the rear side of the first sealing member, and capable of sliding in the extrusion area to extrude the first sealing member;

[0014] It is characterized by: it also includes:

[0015] A regulating chamber is arranged in the extrusion area and surrounds at least part of the extrusion area to form an independent chamber that can be filled with a regulating medium M. Correspondingly, the extrusion member has a first portion connected to the regulating chamber and a second portion connected to the first sealing member;

[0016] When the sealing joint is inserted into the channel, the second axis B and the first axis A have an offset angle α. With the help of the force applied to the extrusion member, the first part forces the regulating chamber to apply pressure to the deflected side of the first sealing member, thereby eliminating the offset angle α generated by the second axis B and the first axis A, so that the channel remains sealed.

[0017] In order to enable the extrusion area to form a regulating chamber, preferably, the extrusion component is radially provided with a third part extending toward the extrusion area, and the first part and the third part are sealed with the sealing joint. The first part, the third part and the sealing joint together form a regulating chamber filled with a regulating medium M. The regulating medium filled in the regulating chamber can be a fluid such as air maintained at a certain pressure, or an elastic medium such as silicone, rubber, etc., and depending on the difference in the regulating medium, the degree of sealing between the first part and the third part and the sealing joint may not be completely consistent. For example, when the regulating medium is air, a stronger seal is required, and when the regulating medium is rubber, the sealing requirement may be slightly weaker. In addition, the third part can also force the regulating chamber to apply pressure to the deflected side of the first seal.

[0018] Furthermore, in order to maintain a seal between the first part and the third part and the sealing joint, preferably, the sealing joint includes a main body coaxially arranged with the first seal, the main body having a first flange protruding radially outward, the first flange being sleeved in the first part, and a second seal for sealing is arranged between the first flange and the first part. Similarly, the main body is sleeved in the third part, and a third seal is arranged between the two. The second seal and the third seal can be, for example, sealing rings, etc. In addition, as needed, a structure for installing or limiting the second seal and the third seal can be arranged in the corresponding area of ​​the extrusion part or the sealing joint.

[0019] In order to limit the first seal when it is extruded, preferably, the body also has a second flange protruding radially outward at one end relative to the first flange, the second flange is sleeved in the second part, and the second flange has a limiting portion protruding radially outward for limiting the first seal, the first seal is sleeved on the second flange and is located between the limiting portion and the second part, the extrusion area is formed between the limiting portion and the first flange, and when the extrusion member slides in the extrusion area, it can extrude the first seal together with the limiting portion.

[0020] In order to solve the second technical problem, preferably, the inner wall of the first part can surround and form a cylindrical independent cavity, the main body is cylindrical, and the first part, the third part, the main body and the first flange together form a cylindrical chamber, and the cylindrical chamber forms the regulating chamber. In fact, the structure of the regulating chamber is elliptical or even rectangular and can have a certain radial compensation ability. The structure of the regulating chamber is designed to be cylindrical in order to achieve all-round and relatively uniform radial compensation.

[0021] In order to be able to drive the extrusion piece to extrude the first sealing member through the regulating substance M in the regulating chamber, preferably, the regulating medium M is air, and the sealing joint or the extrusion piece is provided with a circulation portion for allowing air to flow into the regulating chamber. Using air as the regulating substance M can not only achieve the effect of radial compensation, but also, compared to rubber, air has the ability to be continuously filled to increase the pressure in the regulating chamber. Furthermore, the regulating substance M in the regulating chamber can be used to drive the extrusion piece to move in the extrusion area to extrude the first sealing member.

[0022] Furthermore, in order to increase the pressure of the air in the conditioning chamber, preferably, the first flange extends axially outward and has a connecting portion protruding radially, and the circulation portion is provided on the side wall of the first flange facing the interior of the conditioning chamber. Correspondingly, a flow channel connected to the fluid in the circulation portion is provided inside the first flange and the connecting portion, and a joint connected to the fluid in the flow channel is provided on the side of the connecting portion to connect an external pressure device. The pressure device can be used to maintain the pressure in the conditioning chamber at a certain level so as to have radial compensation capability, and can also increase the pressure in the conditioning chamber on this basis to drive the extrusion member to squeeze the first sealing member.

[0023] In order to enable the sealing joint to move between the initial position and the working position, preferably, the connecting part is connected to a driving source, and the driving source is installed on a base and can carry the sealing joint to move between the initial position and the working position. The driving source can be, for example, a cylinder, an electric push rod, etc., and a transmission structure can also be added according to actual needs.

[0024] In order to further enhance the radial compensation capability of the sealing joint, preferably, the driving source is connected to the connecting part through an elastic mechanism, the elastic mechanism includes a connecting plate connected to the driving source, and the elastic mechanism also includes an elastic member, and the elastic member is arranged between the connecting part and the connecting plate, so that the connecting part always has a tendency to move away from the connecting plate. In fact, the adjustment chamber is more suitable for fine-tuning, so adding the elastic mechanism can further increase the radial compensation capability of the sealing structure.

[0025] Furthermore, in order to make the radial compensation capability of the elastic mechanism relatively uniform, preferably, the elastic mechanism includes at least three elastic members, and each of the elastic members is evenly distributed circumferentially along the axis of the sealing joint. Such a design takes into account the radial compensation capability of the regulating chamber. The force of a single elastic member such as a spring is often distributed at one point, which requires the provision of multiple elastic members, which are evenly distributed circumferentially, so as to have a relatively uniform radial compensation capability as much as possible.

[0026] The "fluid communication" referred to in the present invention refers to the spatial position relationship between two parts or parts (hereinafter collectively referred to as the first part and the second part), that is, the fluid (gas, liquid or a mixture of the two) can flow from the first part along the flow path or / and be transported to the second part. The first part and the second part can be directly connected, or the first part and the second part can be indirectly connected through at least one third party. The third party can be a fluid channel such as a pipe, channel, duct, guide member, hole, groove, etc., or it can be a chamber allowing fluid to flow through, or a combination of the above.

[0027] Compared with the prior art, the advantages of the utility model are:

[0028] 1. The offset angle α between the second axis B and the first axis A can be eliminated through the adjustment chamber, so that the channel remains sealed, and the sealing structure has a certain radial compensation ability, the sealing effect is better, and the sealing structure can seal a large diameter channel;

[0029] 2. The cylindrical adjustment chamber can achieve all-round and relatively uniform radial compensation;

[0030] 3. Using air as the regulating medium enables the regulating chamber to have radial compensation capability while also driving the extrusion member to extrude the first sealing member, with a simple structure and a small volume;

[0031] 4. By adding an elastic mechanism, the overall radial compensation capability of the sealing structure is further enhanced, so that the sealing structure is more suitable for blocking large-diameter channels. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of a workpiece to be blocked in the background technology;

[0033] Figure 2 It is a schematic diagram of the state of the blocking mechanism in the background technology when blocking a large diameter channel;

[0034] Figure 3 This is a structural schematic diagram of the sealing structure in the embodiment of the utility model;

[0035] Figure 4 This is a schematic diagram of the structure of the extrusion part in the embodiment of the utility model;

[0036] Figure 5 This is a schematic structural diagram of the first seal, the second seal, the third seal and the plugging joint in the embodiment of the utility model;

[0037] Figure 6 It is an exploded schematic diagram of the first seal, the second seal, the third seal, the extrusion piece and the plugging joint in the embodiment of the utility model;

[0038] Figure 7 It is a schematic diagram of the structure of the first seal, the second seal, the third seal, the extrusion piece and the plugging joint in the embodiment of the utility model;

[0039] Figure 8 This is a schematic diagram of the state of the plugging joint in the embodiment of the utility model in the initial state;

[0040] Fig. 9 This is a schematic diagram of the state of the plugging joint in the embodiment of the utility model in the initial adjustment state;

[0041] Fig.10 It is a schematic diagram of the state of the plugging joint in the embodiment of the utility model in the secondary adjustment state;

[0042] Fig.11 It is a schematic diagram of the state of the sealing joint in the embodiment of the utility model in the final state. DETAILED DESCRIPTION

[0043] The present invention is further described in detail below in conjunction with specific embodiments.

[0044] like Figures 3 to 7 As shown, it is a preferred embodiment of the utility model. The sealing structure for blocking the channel part in the workpiece in this embodiment includes a plugging joint 2 provided with an extrusion area 21. The sealing structure also includes a first sealing member 31 which is sleeved on the plugging joint 2 and located in the extrusion area 21, and the first sealing member 31 has a second axis B parallel to the first axis A of the channel 1 to be blocked. The sealing structure also includes an extrusion member 4 which is connected to the extrusion area 21 of the plugging joint 2 and is located on the rear side of the first sealing member 31. The extrusion member 4 can slide in the extrusion area 21 to squeeze the first sealing member 31, thereby blocking the channel 1. A regulating chamber 22 is also provided in the extrusion area 21, and the regulating chamber 22 surrounds at least part of the extrusion area 21 to form an independent chamber that can be filled with a regulating medium M. Correspondingly, the extrusion member 4 has a first part 41 connected to the regulating chamber 22 and a second part 42 connected to the first sealing member 31. When the sealing joint 2 is inserted into the channel 1, the second axis B and the first axis A have an offset angle α. With the help of the force applied to the extrusion member 4, the first part 41 forces the regulating chamber 22 to apply pressure to the deflected side of the first sealing member 31, thereby eliminating the offset angle α between the second axis B and the first axis A, so that the channel 1 remains sealed.

[0045] In order to enable the extrusion area 21 to form a regulating chamber 22, the extrusion member 4 is provided with a third portion 43 extending toward the extrusion area 21 in the radial direction, and the first portion 41 and the third portion 43 are sealed with the plugging joint 2, and the first portion 41, the third portion 43 and the plugging joint 2 together form a regulating chamber filled with the regulating medium M. In order to enable the first portion 41 and the third portion 43 to be sealed with the plugging joint 2, the plugging joint 2 includes a body 23 coaxially arranged with the first sealing member 31, the body 23 is provided with a first flange 231 protruding radially outward, the first flange 231 is sleeved in the first portion 41, and a second sealing member 32 for sealing is provided between the first flange 231 and the first portion 41, and similarly, the body 23 is sleeved in the third portion 43, and a third sealing member 33 is provided between the two. In this embodiment, the second seal 32 and the third seal 33 are sealing rings, so a first matching portion 235 for mounting the second seal 32 is also provided on the first flange 231, and similarly, a second matching portion 236 for mounting the third seal 33 is provided on the body 23. In order to limit the first seal 31 when the first seal 31 is squeezed, the body 23 further has a second flange 232 protruding radially outward at one end relative to the first flange 231, the second flange 232 is sleeved in the second portion 42, and a limiting portion 233 for limiting the first seal 31 is protruding radially outward on the second flange 232. The first seal 31 is sleeved on the second flange 232 and is located between the limiting portion 233 and the second portion 42, and an extrusion area 21 is formed between the limiting portion 233 and the first flange 231.

[0046] Furthermore, in order to enable the adjustment chamber 22 to be radially compensated uniformly in all directions, the inner wall of the first part 41 in this embodiment can surround and form a cylindrical independent cavity, and the body 23 is cylindrical, and the first part 41, the third part 43, the body 23 and the first flange 231 together surround a cylindrical chamber, and the cylindrical chamber forms the adjustment chamber 22. The adjustment medium M in this embodiment is air, and a flow portion 221 for air to flow into the adjustment chamber 22 is provided on the sealing joint 2 or the extrusion member 4. The air has the ability to be continuously filled to increase the pressure in the adjustment chamber 22, that is, the adjustment substance M in the adjustment chamber 22 can drive the extrusion member 4 to move in the extrusion area 21 to squeeze the first sealing member 31. In this embodiment, the circulation portion 221 is opened on the side wall of the first flange 231 facing the inside of the regulating chamber 22, and the first flange 231 extends axially outward and has a connecting portion 234 protruding radially. A flow channel 222 connected to the fluid of the circulation portion 221 is arranged inside the first flange 231 and the connecting portion 234, and a connector 223 connected to the fluid of the flow channel 222 is arranged on the side of the connecting portion 234 to connect to an external pressure device.

[0047] Furthermore, in order to enable the plugging joint 2 to move between the initial position and the working position, the sealing structure also has a driving source 51, and the connecting portion 234 is connected to the driving source 51. The driving source 51 is installed on the base 52 and can carry the plugging joint 2 to move between the initial position and the working position. The driving source 51 in this embodiment is a cylinder, so it also has a transmission rod 53 for transmission. In order to further enhance the radial compensation ability of the plugging joint 2, the sealing structure also has an elastic mechanism 6, and the transmission rod 53 is connected to the connecting portion 234 through the elastic mechanism 6. The elastic mechanism 6 includes a connecting plate 61 connected to the driving source 51, and also includes an elastic member 62. In order to make the radial compensation ability of the elastic mechanism 6 relatively uniform, the elastic mechanism 6 in this embodiment has four elastic members 62, and each elastic member 62 is evenly distributed along the circumferential direction of the axis of the plugging joint 2.

[0048] The specific use process of the sealing structure for blocking the channel portion in the workpiece provided in this embodiment is as follows:

[0049] like Figure 8 , which is a schematic diagram of the plugging joint 2 in an initial state. At this time, the plugging joint 2 is located in the initial position. Subsequently, under the drive of the driving source 51, the plugging joint 2 can move toward the channel 1 and be inserted into the channel 1 to enter the working position; see Fig. 9 , the plugging joint 2 is in the initial adjustment state. At this time, due to the radial deviation between the second axis B and the first axis A, the upper part of the first sealing member 31 is subjected to a large force from the channel 1. Under the extrusion of the first sealing member 31, the extrusion member 4 deflects relative to the plugging joint 2. At the same time, the plugging joint 2 is also deflected under the influence of the force. An offset angle α is formed between the second axis B and the first axis A. There is a gap between the lower part of the first sealing member 31 and the channel 1. As the offset angle α is formed, the elastic member 62 on the deflected side is squeezed and applies pressure to the deflected side of the plugging joint 2 to perform the initial adjustment; see FIG. Fig.10 , plugging joint 2 is in the secondary adjustment state, Fig.10 The dotted line in Fig. 9 At this time, under the action of the elastic mechanism 6, the plugging joint 2 is no longer in a deflected state, but the extrusion member 4 is still deflected relative to the plugging joint 2, and there is still a gap between the lower part of the first sealing member 31 and the channel 1. At this time, the force exerted on the extrusion member 4 can force the regulating chamber 22 to apply pressure to the deflected side of the first sealing member 31, thereby eliminating the offset angle α generated by the second axis B and the first axis A; see Fig.11 , the plugging joint 2 is in the final state, Fig.11 The dotted line in Fig.10The extrusion member 4 in the sealing joint 2 is now deflected by the adjustment chamber 22, and the second axis B and the first axis A are restored to a parallel state. Under the action of the adjustment chamber 22, the extrusion member 4 moves in the extrusion area 21 to squeeze the first sealing member 31, thereby eliminating the gap between the lower part of the first sealing member 31 and the channel 1 to block the channel 1. It should be noted that the initial adjustment and the secondary adjustment of the sealing joint 2 may actually occur simultaneously or in reverse order. In this embodiment, the initial adjustment is set in the front for the convenience of description.

Claims

1. A sealing structure for blocking a channel portion in a workpiece, comprising: A plugging joint (2) having a pressing area (21); A first sealing member (31) is sleeved on the plugging joint (2) and is located in the extrusion area (21), wherein the first sealing member (31) has a second axis (B) parallel to the first axis (A) of the channel (1) to be plugged; An extrusion member (4) connected to the extrusion area (21) of the plugging joint (2), located at the rear side of the first sealing member (31), and capable of sliding in the extrusion area (21) to squeeze the first sealing member (31); Features: Also included are: a regulating chamber (22) arranged in the extrusion area (21) and surrounding at least a portion of the extrusion area (21) to form an independent chamber capable of being filled with a regulating medium (M); correspondingly, the extrusion member (4) has a first portion (41) connected to the regulating chamber (22) and a second portion (42) connected to the first sealing member (31); When the sealing joint (2) is inserted into the channel (1), the second axis (B) and the first axis (A) generate an offset angle (α), and the first part (41) forces the regulating chamber (22) to apply pressure to the deflected side of the first sealing member (31) by means of the force applied to the extrusion member (4), thereby eliminating the offset angle (α) generated by the second axis (B) and the first axis (A), so that the channel (1) remains sealed.

2. The sealing structure according to claim 1, Features: The extrusion piece (4) is provided with a third portion (43) extending radially toward the extrusion area (21); the first portion (41) and the third portion (43) are sealed from the sealing joint (2); the first portion (41), the third portion (43) and the sealing joint (2) together form a regulating chamber (22) for filling with a regulating medium (M).

3. The sealing structure according to claim 2, Features: The sealing joint (2) comprises a body (23) coaxially arranged with the first sealing member (31); the body (23) is provided with a first flange (231) protruding radially outward; the first flange (231) is sleeved in the first part (41); a second sealing member (32) for sealing is provided between the first flange (231) and the first part (41); similarly, the body (23) is sleeved in the third part (43); a third sealing member (33) is provided between the two.

4. The sealing structure according to claim 3, Features: The body (23) further has a second flange (232) protruding radially outward at one end relative to the first flange (231); the second flange (232) is sleeved in the second portion (42); the second flange (232) has a limiting portion (233) protruding radially outward for limiting the position of the first sealing member (31); the first sealing member (31) is sleeved on the second flange (232) and is located between the limiting portion (233) and the second portion (42); the extrusion area (21) is formed between the limiting portion (233) and the first flange (231).

5. The sealing structure according to claim 4, Features: The inner wall of the first part (41) can surround and form an independent cylindrical cavity, the main body (23) is cylindrical, and the first part (41), the third part (43), the main body (23) and the first flange (231) together form a cylindrical chamber (R), and the cylindrical chamber (R) forms the regulating chamber (22).

6. The sealing structure according to claim 5, Features: The regulating medium (M) is air, and the sealing joint (2) or the extrusion piece (4) is provided with a flow portion (221) capable of allowing air to flow into the regulating chamber (22).

7. The sealing structure according to claim 6, Features: The first flange (231) extends outward in the axial direction and has a connecting portion (234) protruding in the radial direction. The circulation portion (221) is provided on the side wall of the first flange (231) facing the interior of the regulating chamber (22). Correspondingly, a flow channel (222) in fluid communication with the circulation portion (221) is provided inside the first flange (231) and the connecting portion (234), and a connector (223) in fluid communication with the flow channel (222) is provided on the side of the connecting portion (234) for connecting to an external pressure device.

8. The sealing structure according to claim 7, Features: The connecting portion (234) is connected to a driving source (51), and the driving source (51) is installed on a base (52) and is capable of carrying the sealing joint (2) to move between an initial position and a working position.

9. The sealing structure according to claim 8, Features: The driving source (51) is connected to the connecting portion (234) via an elastic mechanism (6); the elastic mechanism (6) includes a connecting plate (61) connected to the driving source (51); the elastic mechanism (6) also includes an elastic member (62); the elastic member (62) is arranged between the connecting portion (234) and the connecting plate (61), so that the connecting portion (234) always has a tendency to move away from the connecting plate (61).

10. The sealing structure according to claim 9, Features: The elastic mechanism (6) comprises at least three elastic members (62), and each of the elastic members (62) is evenly distributed along the circumference of the axis of the sealing joint (2).

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