Internal expansion plugging device

Abstract

The utility model relates to an internal expansion plugging device, which is used for plugging the end part of a channel, comprises a sealing element capable of preventing fluid in the channel from leaking in an extruded state, and is characterized by further comprising a limiting element with a first limiting part and a second limiting part, and an extruding space for arranging the sealing element is formed between the first limiting part and the second limiting part; when the limiting piece is inserted into the channel, the first limiting part located outside the channel abuts against the end of the channel so that the second limiting part located in the channel can be limited, the extrusion space can be reduced through the extrusion piece capable of sliding relative to the first limiting part, and then the sealing piece is extruded. The internal expansion plugging device has the advantages that plugging can be completed only through one driving source, an internal expansion plugging device with a limiting structure in a channel is not needed, the occupied space of the device can be reduced, and the cost of the device is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of leak detection and plugging, in particular to an internal expansion plugging device. Background Art

[0002] Before leak detection, it is necessary to seal the channel between the cavity to be tested and the outside. When sealing the channel of a hole, an internal expansion sealing device is often used. Specifically, a limiter is usually provided on one side of the sealing ring, and an extrusion member is provided on the other side of the limiter. The sealing ring is deformed and expanded by the extrusion member to obtain an outer diameter larger than the channel size, and finally the sealing ring is interference-fitted with the inner wall of the channel to complete the sealing.

[0003] However, when there is a limiting structure such as a limiting step or a contoured block inside the channel, the limiting member can be easily abutted against the limiting structure to be fixed, and it is only necessary to push the extrusion member toward the limiting member. When the limiting structure does not exist inside the channel, this solution will no longer be applicable. For this reason, there is an internal expansion plugging device in the prior art that does not require a limiting structure inside the channel. For example, the Chinese utility model patent "A Pneumatic Inspection Internal Expansion Mechanism" with patent number CN202021598028.7 (publication number CN212721922U) provides an internal expansion plugging device, which pushes the sealing ring into the channel through a pushing mechanism, and a limiting member fixedly connected to the cylinder and an extrusion member driven by the cylinder are respectively provided at both ends of the sealing ring, and the plugging can be completed by pulling back the extrusion member by the cylinder.

[0004] Although this solution does not require a limiting structure in the channel, it has another defect: the sealing ring needs to be pushed into the channel by a pushing mechanism before sealing, and the sealing ring needs to be removed by the pushing mechanism after the leak detection. Considering that the extrusion part also needs a driving source to drive it, it can be regarded as requiring two driving sources to cooperate with each other during the entire working process. This makes the internal expansion sealing mechanism in this solution need to occupy a larger space. Therefore, further improvement of the existing technology is needed. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide an internal expansion plugging device which only needs one driving source to complete the plugging and does not need a limiting structure inside the channel itself, in view of the above-mentioned existing technical status.

[0006] The technical solution adopted by the utility model to solve the above technical problems is: the internal expansion plugging device is used to plug the end of the channel, including a sealing member that can prevent the fluid in the channel from leaking when squeezed, and is characterized in that it also includes:

[0007] a stopper, which is detachably connected to the channel, and includes a first stopper portion and a second stopper portion which are spaced apart, and an extrusion space for the seal to be arranged therein is formed between the first stopper portion outside the channel and the end of the channel, so that the second stopper portion inside the channel is limited when the stopper is inserted into the channel;

[0008] The extrusion member is connected to the limiting member and can slide relative to the first limiting portion to reduce the extrusion space, thereby causing the sealing member to be extruded.

[0009] In order to enable the first limiting portion to abut against the end of the channel and limit the second limiting portion, preferably, the limiting member includes a first body coaxially arranged with the channel, the first body is radially protruded with an annular flange and an annular convex ring respectively, the outer diameter of the annular flange is larger than the outer diameter of the annular convex ring, the sealing member is sleeved on the first body and located between the annular flange and the annular convex ring, the annular flange constitutes the first limiting portion and the annular convex ring constitutes the second limiting portion, according to actual needs, the first limiting portion can have a variety of structures, such as a limiting member inserted into the first body in the radial direction, or a limiting member installed on the first body by screwing, but the structure of the annular flange is relatively simple, and because the outer diameter of the annular flange is larger than the outer diameter of the annular convex ring, the second limiting portion can enter the interior of the channel, and the first limiting portion will abut against the end of the channel and limit the second limiting portion through the first body, and in addition, considering the installation of the limiting member, the annular convex ring can also be set as a detachable structure.

[0010] In order to enable the extrusion member to pass through the limited first limiting portion and continue to slide toward the extrusion space to extrude the seal, preferably, the extrusion member includes a second body coaxially arranged with the first body, and the second body is provided with an action portion axially toward the first body that can pass through the annular flange and enter the extrusion space, and an extrusion portion that can directly extrude the seal is provided at the front end of the action portion, and the extrusion portion is sleeved on the first body and located at the rear end of the seal, and the action portion can be a common structure such as a sliding rod, and correspondingly, structures such as openings and hollow portions can be opened on the annular flange to cooperate with the action portion, in addition, the action portion of the extrusion member is actually an indirect extrusion seal, and the extrusion portion is a component that directly extrude the seal, and the extrusion portion can be integrally arranged with the action portion, but considering the installation of the action portion and the annular flange, it is more convenient to sleeve the extrusion portion as an independent component on the limiting member.

[0011] Furthermore, in order for the acting part to act on the extrusion part more reasonably, preferably, at least two acting parts are provided and are spaced apart along the circumference of the second body. Correspondingly, the annular flange is provided with openings for each acting part to pass through respectively. On this basis, for example, methods such as evenly arranging each acting part along the circumference of the second body and increasing the number of acting parts can enable the extrusion part to extrude the seal more evenly to a certain extent.

[0012] In order to enable the limiting member to follow the extrusion member away from the channel when the extrusion member moves away from the channel, preferably, a connecting part connected to the first body is provided in the inner area surrounded by the second body and each of the action parts, and the connecting part has a third limiting part. The third limiting part enables the limiting member to follow the extrusion member away from the channel when the extrusion member moves away from the channel. Correspondingly, the extrusion member has a matching part that cooperates with the connecting part. The connecting member can be integrally arranged with the first body, or be arranged as an independent component that can be mounted on the first body. The third limiting part can be arranged as a structure such as an annular convex ring. It should be noted that the main function of the third limiting part is that the limiting member can follow the extrusion member away from the channel when the extrusion member moves away from the channel, and in the process of the extrusion member moving toward the sealing member, the third limiting part does not need to limit the extrusion member, but can also be arranged as a limiting scheme to prevent the extrusion member from excessively squeezing the seal.

[0013] In order to drive the extrusion member to move toward or away from the channel, preferably, the extrusion member is connected to a driving source, and the driving source is installed on a base. The driving source can drive the extrusion member to move toward or away from the channel. The driving source can be a commonly used driving source such as a cylinder, or it can be directly inflated to directly drive the extrusion member by air pressure. If the extrusion member is directly driven by air pressure, no additional transmission member is required.

[0014] Furthermore, in order to transmit the power output by the driving source to the extrusion piece, preferably, a transmission rod for transmission is also provided on the driving source, and the driving source drives the extrusion piece to move through the transmission rod. The transmission rod is provided considering that common driving sources such as cylinders can be applicable to most situations.

[0015] In order to prevent the error in the position of the channel from making it difficult to seal, preferably, a compensation mechanism is also provided on the transmission rod, and the compensation mechanism includes a connecting plate connected to the transmission rod and an elastic member with a compensating function. The connecting plate is connected to the extrusion member through the elastic member, so that the extrusion member always has a tendency to move away from the connecting plate. With such a design, if there is an error in the position of the channel, the axis of the extrusion member will be deflected relative to the axis of the channel, and the squeezed elastic member will have a greater force to compensate for the deviation, so as to reduce the impact of the error in the position of the channel on the sealing.

[0016] Furthermore, in order to ensure that the compensation mechanism has relatively good compensation performance, preferably, the compensation mechanism is provided with at least three elastic members, and each of the elastic members is evenly distributed along the circumference of the extrusion member. The uniform distribution of the elastic members along the circumference of the extrusion member can make the distribution of the compensating force at various angles relatively uniform.

[0017] Compared with the prior art, the advantages of the utility model are: the second limiting portion located in the channel is limited by the first limiting portion located outside the channel abutting against the end of the channel, and the sealing member is squeezed by an extrusion member that can slide relative to the first limiting portion. Only one driving source is needed to complete the sealing, and there is no need for an internal expansion sealing device with a limiting structure inside the channel itself, which can reduce the space occupied by the device and reduce the cost of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the internal expansion plugging device in the embodiment of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the position limiting member in the embodiment of the utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the extrusion part in the embodiment of the utility model;

[0021] Figure 4 It is a schematic diagram of the structure after the stopper and the extrusion member are assembled in the embodiment of the utility model;

[0022] Figure 5 It is a schematic diagram of the exploded structure of the sealing member, the limiting member and the extruding member in the embodiment of the utility model;

[0023] Figure 6 This is a schematic diagram of the internal expansion plugging device in the embodiment of the utility model in the initial state;

[0024] Figure 7 This is a schematic diagram of the internal expansion plugging device in the embodiment of the utility model in an inserted state;

[0025] Figure 8 It is a schematic diagram of the state of the internal expansion blocking device in the embodiment of the utility model in the blocking state. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below in conjunction with specific embodiments.

[0027] like Figures 1 to 8 The internal expansion plugging device in this embodiment is used to plug the end of the channel 1, and includes a sealing member 2 that can prevent fluid leakage in the channel 1 under the squeezed state, and also includes a limiting member 3 and an extrusion member 4.

[0028] The stopper 3 is detachably connected to the channel 1, and includes a first stopper 31 and a second stopper 32 arranged at intervals, and an extrusion space 33 is formed between the two for the seal 2 to be arranged therein. Specifically, the stopper 3 includes a first body 34 arranged coaxially with the channel 1, and the first body 34 is radially protruded with an annular flange A and an annular convex ring B, respectively, and the outer diameter of the annular flange A is greater than the outer diameter of the annular convex ring B, and the seal is sleeved on the first body 34 and located between the annular flange A and the annular convex ring B, and the annular flange A constitutes the first stopper 31 and the annular convex ring B constitutes the second stopper 32. This allows the second stopper 32 to enter the interior of the channel 1, and the first stopper 31 will abut against the end of the channel 1 and limit the second stopper 32 through the first body 34. In addition, considering the installation problem of the limit member 3, the annular bead B in this embodiment is a detachable structure, and a mounting hole 321 for mounting to the first body 34 is provided on the annular bead B. Correspondingly, a matching hole 341 is opened on the first body 34, and the matching hole 341 is a threaded hole, so the annular bead B can be fixedly connected to the first body 34 by bolt connection.

[0029] The extrusion member 4 is connected to the stopper 3 and can slide relative to the first stopper 31 to reduce the extrusion space 33, thereby extruding the seal 2. Specifically, the extrusion member 4 includes a second body 41 coaxially arranged with the first body 34, and the second body 41 is provided with an action portion 42 that can pass through the annular flange A and enter the extrusion space 33 axially toward the first body 34, and an extrusion portion 43 that can directly extrude the seal 2 is provided at the front end of the action portion 42, and the extrusion portion 43 is sleeved on the first body 34 and located at the rear end of the seal 2. In this embodiment, the action portion 42 is a sliding rod structure that can pass through the annular flange A. Further, at least two action portions 42 are provided and are spaced apart along the circumference of the second body 41. In this embodiment, a total of six action portions 42 are provided and are evenly distributed along the circumference of the second body 41. Correspondingly, the annular flange A is provided with openings 311 for each action portion 42 to pass through.

[0030] Furthermore, the internal expansion plugging device in this embodiment also includes a driving source 5 and a base 6. The extrusion member 4 is connected to the driving source 5, and the driving source 5 is installed on the base 6. The driving source 5 can drive the extrusion member 4 to move toward or away from the channel 1. In this embodiment, the driving source 5 is a cylinder, so a transmission rod 51 for transmission is also provided on the driving source 5, and the driving source 5 drives the extrusion member 4 to move through the transmission rod 51. In order to prevent the position of the channel 1 from being difficult to plug due to errors, a compensation mechanism 7 is also provided on the transmission rod 51. The compensation mechanism 7 includes a connecting plate 71 connected to the transmission rod 51 and an elastic member 72 with a compensation function. The connecting plate 71 is connected to the extrusion member 4 through the elastic member 72, so that the extrusion member 4 always has a tendency to move away from the connecting plate 71. In order to ensure that the compensation mechanism 7 has relatively good compensation performance, the compensation mechanism 7 in this embodiment is provided with three elastic members 72, and each elastic member 72 is evenly distributed along the circumference of the extrusion member 4. With such a design, if there is an error in the position of channel 1, the axis of the extrusion member 4 will be offset relative to the axis of the channel 1, and the corresponding elastic member 72 will have a greater force to compensate for the offset, so as to reduce the impact of the error in the position of channel 1 on the blockage.

[0031] After the plugging is completed, the extrusion member 4 and the stopper 3 need to be moved away from the channel 1 to return to the initial state. The extrusion member 4 is driven by the driving source 5 and the transmission rod 51 to move away from the channel 1. In order for the stopper 3 to follow the extrusion member 4 away from the channel 1 when the extrusion member 4 moves away from the channel 1, a connection portion 35 connected to the first body 34 is provided in the inner area surrounded by the second body 41 and each action portion 42. The connection portion 35 has a third stopper 351. The third stopper 351 enables the stopper 3 to follow the extrusion member 4 away from the channel 1 when the extrusion member 4 moves away from the channel 1. Correspondingly, the extrusion member 4 has a matching portion 44 that matches the connection portion 35. The third stopper 351 in this embodiment is a stopper boss that can contact the inner end surface of the matching portion 44 to follow the extrusion member 4 away from the channel 1.

[0032] The specific use process of the internal expansion plugging device provided in this embodiment is as follows:

[0033] like Figure 6 As shown, at this time, the internal expansion plugging device is in the initial state, and the limiter 3 is completely located outside the channel 1. Then, under the drive of the driving source 5, the transmission rod 51 will push the extrusion member 4 and the limiter 3 to move toward the channel 1, and insert the limiter 3 into the channel 1; see Figure 7 At this time, the internal expansion plugging device is in an inserted state, that is, the limiting member 3 has been inserted into the channel 1. At this time, the first limiting portion 31 conflicts with the end surface of the channel 1, so that the limiting member 3 as a whole cannot continue to move toward the inside of the channel 1, so that the second limiting portion 32 is limited, and the second limiting portion 32 conflicts with the sealing member 2, limiting the sealing member 2 from continuing to move toward the inside of the channel 1; see Figure 8 Since the action portion 42 of the extrusion member 4 can move relative to the opening 311 of the limiting member 3, under the action of the driving source 5, the extrusion member 4 can still continue to move toward the inside of the channel 1, thereby entering the extrusion space 33 to reduce the extrusion space 33. The extrusion portion 43 and the second limiting portion 32 jointly extrude the sealing member 2, causing the sealing member 2 to expand and thereby block the channel 1.

Claims

1. An internal expansion plugging device, used for plugging at the end of a channel (1), comprising a sealing member (2) capable of preventing leakage of fluid in the channel (1) when squeezed, characterized in that: Also included are: a limiting member (3) which is detachably connected to the channel (1), comprising a first limiting portion (31) and a second limiting portion (32) which are arranged at intervals, and an extrusion space (33) for the sealing member (2) to be arranged therein is formed between the first limiting portion (31) located outside the channel (1) and the end of the channel (1), so that the second limiting portion (32) located inside the channel (1) is limited in position; An extrusion member (4) is connected to the limiting member (3) and can slide relative to the first limiting portion (31) to reduce the extrusion space (33), thereby causing the sealing member (2) to be extruded.

2. The internal expansion plugging device according to claim 1, characterized in that: The limiting member (3) comprises a first body (34) coaxially arranged with the channel (1); the first body (34) is provided with an annular flange (A) and an annular convex ring (B) protruding radially outwardly; the outer diameter of the annular flange (A) is larger than the outer diameter of the annular convex ring (B); the sealing member (2) is sleeved on the first body (34) and is located between the annular flange (A) and the annular convex ring (B); the annular flange (A) constitutes the first limiting portion (31) and the annular convex ring (B) constitutes the second limiting portion (32).

3. The internal expansion plugging device according to claim 2, characterized in that: The extrusion member (4) includes a second body (41) coaxially arranged with the first body (34); the second body (41) is provided with an action portion (42) axially toward the first body (34) and capable of passing through the annular flange (A) and entering the extrusion space (33); and an extrusion portion (43) capable of directly extruding the sealing member (2) is provided at the front end of the action portion (42); the extrusion portion (43) is sleeved on the first body (34) and located at the rear end of the sealing member (2).

4. The internal expansion plugging device according to claim 3, characterized in that: At least two of the action parts (42) are provided and are spaced apart along the circumference of the second body (41). Correspondingly, the annular flange (A) is provided with openings (311) for each of the action parts to pass through.

5. The internal expansion plugging device according to claim 4, characterized in that: A connecting portion (35) connected to the first body (34) is provided in an inner area enclosed by the second body (41) and each of the action portions (42); the connecting portion (35) has a third limiting portion (351); the third limiting portion (351) enables the limiting member (3) to follow the extrusion member (4) away from the channel (1) when the extrusion member (4) moves away from the channel (1); correspondingly, the extrusion member (4) has a matching portion (44) matching with the connecting portion (35).

6. The internal expansion plugging device according to any one of claims 1 to 5, characterized in that: The extrusion member (4) is connected to a driving source (5), and the driving source (5) is mounted on a base (6). The driving source (5) is capable of driving the extrusion member (4) to move toward or away from the channel (1).

7. The internal expansion plugging device according to claim 6, characterized in that: A transmission rod (51) for transmission is also provided on the driving source (5), and the driving source (5) drives the extrusion member (4) to move via the transmission rod (51).

8. The internal expansion plugging device according to claim 7, characterized in that: A compensation mechanism (7) is also provided on the transmission rod (51), and the compensation mechanism (7) comprises a connecting plate (71) connected to the transmission rod (51) and an elastic member (72) having a compensation function. The connecting plate (71) is connected to the extrusion member (4) via the elastic member (72), so that the extrusion member (4) always has a tendency to move away from the connecting plate (71).

9. The internal expansion plugging device according to claim 8, characterized in that: The compensation mechanism (7) is provided with at least three elastic members (72), and each of the elastic members (72) is evenly distributed along the circumference of the extrusion member (4).

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